Implement comprehensive animation system (closes #59)

- Add Animation class with 30+ easing functions (linear, ease in/out, quad, cubic, elastic, bounce, etc.)
- Add property system to all UI classes for animation support:
  - UIFrame: position, size, colors (including individual r/g/b/a components)
  - UICaption: position, size, text, colors
  - UISprite: position, scale, sprite_number (with sequence support)
  - UIGrid: position, size, camera center, zoom
  - UIEntity: position, sprite properties
- Create AnimationManager singleton for frame-based updates
- Add Python bindings through PyAnimation wrapper
- Support for delta animations (relative values)
- Fix segfault when running scripts directly (mcrf_module initialization)
- Fix headless/windowed mode behavior to respect --headless flag
- Animations run purely in C++ without Python callbacks per frame

All UI properties are now animatable with smooth interpolation and professional easing curves.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/Animation.cpp

@@ -0,0 +1,527 @@
+#include "Animation.h"
+#include "UIDrawable.h"
+#include "UIEntity.h"
+#include <cmath>
+#include <algorithm>
+#include <unordered_map>
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+// Animation implementation
+Animation::Animation(const std::string& targetProperty, 
+                     const AnimationValue& targetValue,
+                     float duration,
+                     EasingFunction easingFunc,
+                     bool delta)
+    : targetProperty(targetProperty)
+    , targetValue(targetValue)
+    , duration(duration)
+    , easingFunc(easingFunc)
+    , delta(delta)
+{
+}
+
+void Animation::start(UIDrawable* target) {
+    currentTarget = target;
+    elapsed = 0.0f;
+    
+    // Capture startValue from target based on targetProperty
+    if (!currentTarget) return;
+    
+    // Try to get the current value based on the expected type
+    std::visit([this](const auto& targetVal) {
+        using T = std::decay_t<decltype(targetVal)>;
+        
+        if constexpr (std::is_same_v<T, float>) {
+            float value;
+            if (currentTarget->getProperty(targetProperty, value)) {
+                startValue = value;
+            }
+        }
+        else if constexpr (std::is_same_v<T, int>) {
+            int value;
+            if (currentTarget->getProperty(targetProperty, value)) {
+                startValue = value;
+            }
+        }
+        else if constexpr (std::is_same_v<T, std::vector<int>>) {
+            // For sprite animation, get current sprite index
+            int value;
+            if (currentTarget->getProperty(targetProperty, value)) {
+                startValue = value;
+            }
+        }
+        else if constexpr (std::is_same_v<T, sf::Color>) {
+            sf::Color value;
+            if (currentTarget->getProperty(targetProperty, value)) {
+                startValue = value;
+            }
+        }
+        else if constexpr (std::is_same_v<T, sf::Vector2f>) {
+            sf::Vector2f value;
+            if (currentTarget->getProperty(targetProperty, value)) {
+                startValue = value;
+            }
+        }
+        else if constexpr (std::is_same_v<T, std::string>) {
+            std::string value;
+            if (currentTarget->getProperty(targetProperty, value)) {
+                startValue = value;
+            }
+        }
+    }, targetValue);
+}
+
+void Animation::startEntity(UIEntity* target) {
+    currentEntityTarget = target;
+    currentTarget = nullptr;  // Clear drawable target
+    elapsed = 0.0f;
+    
+    // Capture the starting value from the entity
+    std::visit([this, target](const auto& val) {
+        using T = std::decay_t<decltype(val)>;
+        
+        if constexpr (std::is_same_v<T, float>) {
+            float value = 0.0f;
+            if (target->getProperty(targetProperty, value)) {
+                startValue = value;
+            }
+        }
+        else if constexpr (std::is_same_v<T, int>) {
+            // For entities, we might need to handle sprite_number differently
+            if (targetProperty == "sprite_number") {
+                startValue = target->sprite.getSpriteIndex();
+            }
+        }
+        // Entities don't support other types yet
+    }, targetValue);
+}
+
+bool Animation::update(float deltaTime) {
+    if ((!currentTarget && !currentEntityTarget) || isComplete()) {
+        return false;
+    }
+    
+    elapsed += deltaTime;
+    elapsed = std::min(elapsed, duration);
+    
+    // Calculate easing value (0.0 to 1.0)
+    float t = duration > 0 ? elapsed / duration : 1.0f;
+    float easedT = easingFunc(t);
+    
+    // Get interpolated value
+    AnimationValue currentValue = interpolate(easedT);
+    
+    // Apply currentValue to target (either drawable or entity)
+    std::visit([this](const auto& value) {
+        using T = std::decay_t<decltype(value)>;
+        
+        if (currentTarget) {
+            // Handle UIDrawable targets
+            if constexpr (std::is_same_v<T, float>) {
+                currentTarget->setProperty(targetProperty, value);
+            }
+            else if constexpr (std::is_same_v<T, int>) {
+                currentTarget->setProperty(targetProperty, value);
+            }
+            else if constexpr (std::is_same_v<T, sf::Color>) {
+                currentTarget->setProperty(targetProperty, value);
+            }
+            else if constexpr (std::is_same_v<T, sf::Vector2f>) {
+                currentTarget->setProperty(targetProperty, value);
+            }
+            else if constexpr (std::is_same_v<T, std::string>) {
+                currentTarget->setProperty(targetProperty, value);
+            }
+        }
+        else if (currentEntityTarget) {
+            // Handle UIEntity targets
+            if constexpr (std::is_same_v<T, float>) {
+                currentEntityTarget->setProperty(targetProperty, value);
+            }
+            else if constexpr (std::is_same_v<T, int>) {
+                currentEntityTarget->setProperty(targetProperty, value);
+            }
+            // Entities don't support other types yet
+        }
+    }, currentValue);
+    
+    return !isComplete();
+}
+
+AnimationValue Animation::getCurrentValue() const {
+    float t = duration > 0 ? elapsed / duration : 1.0f;
+    float easedT = easingFunc(t);
+    return interpolate(easedT);
+}
+
+AnimationValue Animation::interpolate(float t) const {
+    // Visit the variant to perform type-specific interpolation
+    return std::visit([this, t](const auto& target) -> AnimationValue {
+        using T = std::decay_t<decltype(target)>;
+        
+        if constexpr (std::is_same_v<T, float>) {
+            // Interpolate float
+            const float* start = std::get_if<float>(&startValue);
+            if (!start) return target;  // Type mismatch
+            
+            if (delta) {
+                return *start + target * t;
+            } else {
+                return *start + (target - *start) * t;
+            }
+        }
+        else if constexpr (std::is_same_v<T, int>) {
+            // Interpolate integer
+            const int* start = std::get_if<int>(&startValue);
+            if (!start) return target;
+            
+            float result;
+            if (delta) {
+                result = *start + target * t;
+            } else {
+                result = *start + (target - *start) * t;
+            }
+            return static_cast<int>(std::round(result));
+        }
+        else if constexpr (std::is_same_v<T, std::vector<int>>) {
+            // For sprite animation, interpolate through the list
+            if (target.empty()) return target;
+            
+            // Map t to an index in the vector
+            size_t index = static_cast<size_t>(t * (target.size() - 1));
+            index = std::min(index, target.size() - 1);
+            return static_cast<int>(target[index]);
+        }
+        else if constexpr (std::is_same_v<T, sf::Color>) {
+            // Interpolate color
+            const sf::Color* start = std::get_if<sf::Color>(&startValue);
+            if (!start) return target;
+            
+            sf::Color result;
+            if (delta) {
+                result.r = std::clamp(start->r + target.r * t, 0.0f, 255.0f);
+                result.g = std::clamp(start->g + target.g * t, 0.0f, 255.0f);
+                result.b = std::clamp(start->b + target.b * t, 0.0f, 255.0f);
+                result.a = std::clamp(start->a + target.a * t, 0.0f, 255.0f);
+            } else {
+                result.r = start->r + (target.r - start->r) * t;
+                result.g = start->g + (target.g - start->g) * t;
+                result.b = start->b + (target.b - start->b) * t;
+                result.a = start->a + (target.a - start->a) * t;
+            }
+            return result;
+        }
+        else if constexpr (std::is_same_v<T, sf::Vector2f>) {
+            // Interpolate vector
+            const sf::Vector2f* start = std::get_if<sf::Vector2f>(&startValue);
+            if (!start) return target;
+            
+            if (delta) {
+                return sf::Vector2f(start->x + target.x * t, 
+                                    start->y + target.y * t);
+            } else {
+                return sf::Vector2f(start->x + (target.x - start->x) * t,
+                                    start->y + (target.y - start->y) * t);
+            }
+        }
+        else if constexpr (std::is_same_v<T, std::string>) {
+            // For text, show characters based on t
+            const std::string* start = std::get_if<std::string>(&startValue);
+            if (!start) return target;
+            
+            // If delta mode, append characters from target
+            if (delta) {
+                size_t chars = static_cast<size_t>(target.length() * t);
+                return *start + target.substr(0, chars);
+            } else {
+                // Transition from start text to target text
+                if (t < 0.5f) {
+                    // First half: remove characters from start
+                    size_t chars = static_cast<size_t>(start->length() * (1.0f - t * 2.0f));
+                    return start->substr(0, chars);
+                } else {
+                    // Second half: add characters to target
+                    size_t chars = static_cast<size_t>(target.length() * ((t - 0.5f) * 2.0f));
+                    return target.substr(0, chars);
+                }
+            }
+        }
+        
+        return target;  // Fallback
+    }, targetValue);
+}
+
+// Easing functions implementation
+namespace EasingFunctions {
+
+float linear(float t) {
+    return t;
+}
+
+float easeIn(float t) {
+    return t * t;
+}
+
+float easeOut(float t) {
+    return t * (2.0f - t);
+}
+
+float easeInOut(float t) {
+    return t < 0.5f ? 2.0f * t * t : -1.0f + (4.0f - 2.0f * t) * t;
+}
+
+// Quadratic
+float easeInQuad(float t) {
+    return t * t;
+}
+
+float easeOutQuad(float t) {
+    return t * (2.0f - t);
+}
+
+float easeInOutQuad(float t) {
+    return t < 0.5f ? 2.0f * t * t : -1.0f + (4.0f - 2.0f * t) * t;
+}
+
+// Cubic
+float easeInCubic(float t) {
+    return t * t * t;
+}
+
+float easeOutCubic(float t) {
+    float t1 = t - 1.0f;
+    return t1 * t1 * t1 + 1.0f;
+}
+
+float easeInOutCubic(float t) {
+    return t < 0.5f ? 4.0f * t * t * t : (t - 1.0f) * (2.0f * t - 2.0f) * (2.0f * t - 2.0f) + 1.0f;
+}
+
+// Quartic
+float easeInQuart(float t) {
+    return t * t * t * t;
+}
+
+float easeOutQuart(float t) {
+    float t1 = t - 1.0f;
+    return 1.0f - t1 * t1 * t1 * t1;
+}
+
+float easeInOutQuart(float t) {
+    return t < 0.5f ? 8.0f * t * t * t * t : 1.0f - 8.0f * (t - 1.0f) * (t - 1.0f) * (t - 1.0f) * (t - 1.0f);
+}
+
+// Sine
+float easeInSine(float t) {
+    return 1.0f - std::cos(t * M_PI / 2.0f);
+}
+
+float easeOutSine(float t) {
+    return std::sin(t * M_PI / 2.0f);
+}
+
+float easeInOutSine(float t) {
+    return 0.5f * (1.0f - std::cos(M_PI * t));
+}
+
+// Exponential
+float easeInExpo(float t) {
+    return t == 0.0f ? 0.0f : std::pow(2.0f, 10.0f * (t - 1.0f));
+}
+
+float easeOutExpo(float t) {
+    return t == 1.0f ? 1.0f : 1.0f - std::pow(2.0f, -10.0f * t);
+}
+
+float easeInOutExpo(float t) {
+    if (t == 0.0f) return 0.0f;
+    if (t == 1.0f) return 1.0f;
+    if (t < 0.5f) {
+        return 0.5f * std::pow(2.0f, 20.0f * t - 10.0f);
+    } else {
+        return 1.0f - 0.5f * std::pow(2.0f, -20.0f * t + 10.0f);
+    }
+}
+
+// Circular
+float easeInCirc(float t) {
+    return 1.0f - std::sqrt(1.0f - t * t);
+}
+
+float easeOutCirc(float t) {
+    float t1 = t - 1.0f;
+    return std::sqrt(1.0f - t1 * t1);
+}
+
+float easeInOutCirc(float t) {
+    if (t < 0.5f) {
+        return 0.5f * (1.0f - std::sqrt(1.0f - 4.0f * t * t));
+    } else {
+        return 0.5f * (std::sqrt(1.0f - (2.0f * t - 2.0f) * (2.0f * t - 2.0f)) + 1.0f);
+    }
+}
+
+// Elastic
+float easeInElastic(float t) {
+    if (t == 0.0f) return 0.0f;
+    if (t == 1.0f) return 1.0f;
+    float p = 0.3f;
+    float a = 1.0f;
+    float s = p / 4.0f;
+    float t1 = t - 1.0f;
+    return -(a * std::pow(2.0f, 10.0f * t1) * std::sin((t1 - s) * (2.0f * M_PI) / p));
+}
+
+float easeOutElastic(float t) {
+    if (t == 0.0f) return 0.0f;
+    if (t == 1.0f) return 1.0f;
+    float p = 0.3f;
+    float a = 1.0f;
+    float s = p / 4.0f;
+    return a * std::pow(2.0f, -10.0f * t) * std::sin((t - s) * (2.0f * M_PI) / p) + 1.0f;
+}
+
+float easeInOutElastic(float t) {
+    if (t == 0.0f) return 0.0f;
+    if (t == 1.0f) return 1.0f;
+    float p = 0.45f;
+    float a = 1.0f;
+    float s = p / 4.0f;
+    
+    if (t < 0.5f) {
+        float t1 = 2.0f * t - 1.0f;
+        return -0.5f * (a * std::pow(2.0f, 10.0f * t1) * std::sin((t1 - s) * (2.0f * M_PI) / p));
+    } else {
+        float t1 = 2.0f * t - 1.0f;
+        return a * std::pow(2.0f, -10.0f * t1) * std::sin((t1 - s) * (2.0f * M_PI) / p) * 0.5f + 1.0f;
+    }
+}
+
+// Back (overshooting)
+float easeInBack(float t) {
+    const float s = 1.70158f;
+    return t * t * ((s + 1.0f) * t - s);
+}
+
+float easeOutBack(float t) {
+    const float s = 1.70158f;
+    float t1 = t - 1.0f;
+    return t1 * t1 * ((s + 1.0f) * t1 + s) + 1.0f;
+}
+
+float easeInOutBack(float t) {
+    const float s = 1.70158f * 1.525f;
+    if (t < 0.5f) {
+        return 0.5f * (4.0f * t * t * ((s + 1.0f) * 2.0f * t - s));
+    } else {
+        float t1 = 2.0f * t - 2.0f;
+        return 0.5f * (t1 * t1 * ((s + 1.0f) * t1 + s) + 2.0f);
+    }
+}
+
+// Bounce
+float easeOutBounce(float t) {
+    if (t < 1.0f / 2.75f) {
+        return 7.5625f * t * t;
+    } else if (t < 2.0f / 2.75f) {
+        float t1 = t - 1.5f / 2.75f;
+        return 7.5625f * t1 * t1 + 0.75f;
+    } else if (t < 2.5f / 2.75f) {
+        float t1 = t - 2.25f / 2.75f;
+        return 7.5625f * t1 * t1 + 0.9375f;
+    } else {
+        float t1 = t - 2.625f / 2.75f;
+        return 7.5625f * t1 * t1 + 0.984375f;
+    }
+}
+
+float easeInBounce(float t) {
+    return 1.0f - easeOutBounce(1.0f - t);
+}
+
+float easeInOutBounce(float t) {
+    if (t < 0.5f) {
+        return 0.5f * easeInBounce(2.0f * t);
+    } else {
+        return 0.5f * easeOutBounce(2.0f * t - 1.0f) + 0.5f;
+    }
+}
+
+// Get easing function by name
+EasingFunction getByName(const std::string& name) {
+    static std::unordered_map<std::string, EasingFunction> easingMap = {
+        {"linear", linear},
+        {"easeIn", easeIn},
+        {"easeOut", easeOut},
+        {"easeInOut", easeInOut},
+        {"easeInQuad", easeInQuad},
+        {"easeOutQuad", easeOutQuad},
+        {"easeInOutQuad", easeInOutQuad},
+        {"easeInCubic", easeInCubic},
+        {"easeOutCubic", easeOutCubic},
+        {"easeInOutCubic", easeInOutCubic},
+        {"easeInQuart", easeInQuart},
+        {"easeOutQuart", easeOutQuart},
+        {"easeInOutQuart", easeInOutQuart},
+        {"easeInSine", easeInSine},
+        {"easeOutSine", easeOutSine},
+        {"easeInOutSine", easeInOutSine},
+        {"easeInExpo", easeInExpo},
+        {"easeOutExpo", easeOutExpo},
+        {"easeInOutExpo", easeInOutExpo},
+        {"easeInCirc", easeInCirc},
+        {"easeOutCirc", easeOutCirc},
+        {"easeInOutCirc", easeInOutCirc},
+        {"easeInElastic", easeInElastic},
+        {"easeOutElastic", easeOutElastic},
+        {"easeInOutElastic", easeInOutElastic},
+        {"easeInBack", easeInBack},
+        {"easeOutBack", easeOutBack},
+        {"easeInOutBack", easeInOutBack},
+        {"easeInBounce", easeInBounce},
+        {"easeOutBounce", easeOutBounce},
+        {"easeInOutBounce", easeInOutBounce}
+    };
+    
+    auto it = easingMap.find(name);
+    if (it != easingMap.end()) {
+        return it->second;
+    }
+    return linear;  // Default to linear
+}
+
+} // namespace EasingFunctions
+
+// AnimationManager implementation
+AnimationManager& AnimationManager::getInstance() {
+    static AnimationManager instance;
+    return instance;
+}
+
+void AnimationManager::addAnimation(std::shared_ptr<Animation> animation) {
+    activeAnimations.push_back(animation);
+}
+
+void AnimationManager::update(float deltaTime) {
+    for (auto& anim : activeAnimations) {
+        anim->update(deltaTime);
+    }
+    cleanup();
+}
+
+void AnimationManager::cleanup() {
+    activeAnimations.erase(
+        std::remove_if(activeAnimations.begin(), activeAnimations.end(),
+            [](const std::shared_ptr<Animation>& anim) {
+                return anim->isComplete();
+            }),
+        activeAnimations.end()
+    );
+}
+
+void AnimationManager::clear() {
+    activeAnimations.clear();
+}

src/Animation.h

@@ -0,0 +1,146 @@
+#pragma once
+
+#include <string>
+#include <functional>
+#include <memory>
+#include <variant>
+#include <vector>
+#include <SFML/Graphics.hpp>
+
+// Forward declarations
+class UIDrawable;
+class UIEntity;
+
+// Forward declare namespace
+namespace EasingFunctions {
+    float linear(float t);
+}
+
+// Easing function type
+typedef std::function<float(float)> EasingFunction;
+
+// Animation target value can be various types
+typedef std::variant<
+    float,                    // Single float value
+    int,                      // Single integer value
+    std::vector<int>,         // List of integers (for sprite animation)
+    sf::Color,                // Color animation
+    sf::Vector2f,             // Vector animation
+    std::string               // String animation (for text)
+> AnimationValue;
+
+class Animation {
+public:
+    // Constructor
+    Animation(const std::string& targetProperty, 
+              const AnimationValue& targetValue,
+              float duration,
+              EasingFunction easingFunc = EasingFunctions::linear,
+              bool delta = false);
+    
+    // Apply this animation to a drawable
+    void start(UIDrawable* target);
+    
+    // Apply this animation to an entity (special case since Entity doesn't inherit from UIDrawable)
+    void startEntity(UIEntity* target);
+    
+    // Update animation (called each frame)
+    // Returns true if animation is still running, false if complete
+    bool update(float deltaTime);
+    
+    // Get current interpolated value
+    AnimationValue getCurrentValue() const;
+    
+    // Animation properties
+    std::string getTargetProperty() const { return targetProperty; }
+    float getDuration() const { return duration; }
+    float getElapsed() const { return elapsed; }
+    bool isComplete() const { return elapsed >= duration; }
+    bool isDelta() const { return delta; }
+    
+private:
+    std::string targetProperty;    // Property name to animate (e.g., "x", "color.r", "sprite_number")
+    AnimationValue startValue;     // Starting value (captured when animation starts)
+    AnimationValue targetValue;    // Target value to animate to
+    float duration;                // Animation duration in seconds
+    float elapsed = 0.0f;          // Elapsed time
+    EasingFunction easingFunc;     // Easing function to use
+    bool delta;                    // If true, targetValue is relative to start
+    
+    UIDrawable* currentTarget = nullptr;  // Current target being animated
+    UIEntity* currentEntityTarget = nullptr;  // Current entity target (alternative to drawable)
+    
+    // Helper to interpolate between values
+    AnimationValue interpolate(float t) const;
+};
+
+// Easing functions library
+namespace EasingFunctions {
+    // Basic easing functions
+    float linear(float t);
+    float easeIn(float t);
+    float easeOut(float t);
+    float easeInOut(float t);
+    
+    // Advanced easing functions
+    float easeInQuad(float t);
+    float easeOutQuad(float t);
+    float easeInOutQuad(float t);
+    
+    float easeInCubic(float t);
+    float easeOutCubic(float t);
+    float easeInOutCubic(float t);
+    
+    float easeInQuart(float t);
+    float easeOutQuart(float t);
+    float easeInOutQuart(float t);
+    
+    float easeInSine(float t);
+    float easeOutSine(float t);
+    float easeInOutSine(float t);
+    
+    float easeInExpo(float t);
+    float easeOutExpo(float t);
+    float easeInOutExpo(float t);
+    
+    float easeInCirc(float t);
+    float easeOutCirc(float t);
+    float easeInOutCirc(float t);
+    
+    float easeInElastic(float t);
+    float easeOutElastic(float t);
+    float easeInOutElastic(float t);
+    
+    float easeInBack(float t);
+    float easeOutBack(float t);
+    float easeInOutBack(float t);
+    
+    float easeInBounce(float t);
+    float easeOutBounce(float t);
+    float easeInOutBounce(float t);
+    
+    // Get easing function by name
+    EasingFunction getByName(const std::string& name);
+}
+
+// Animation manager to handle active animations
+class AnimationManager {
+public:
+    static AnimationManager& getInstance();
+    
+    // Add an animation to be managed
+    void addAnimation(std::shared_ptr<Animation> animation);
+    
+    // Update all animations
+    void update(float deltaTime);
+    
+    // Remove completed animations
+    void cleanup();
+    
+    // Clear all animations
+    void clear();
+    
+private:
+    AnimationManager() = default;
+    std::vector<std::shared_ptr<Animation>> activeAnimations;
+};

src/GameEngine.cpp

@@ -4,6 +4,7 @@
 #include "PyScene.h"
 #include "UITestScene.h"
 #include "Resources.h"
+#include "Animation.h"
 
 GameEngine::GameEngine() : GameEngine(McRogueFaceConfig{})
 {
@@ -114,11 +115,18 @@ void GameEngine::run()
 {
     std::cout << "GameEngine::run() starting main loop..." << std::endl;
     float fps = 0.0;
+    frameTime = 0.016f; // Initialize to ~60 FPS
     clock.restart();
     while (running)
     {
         currentScene()->update();
         testTimers();
+        
+        // Update animations (only if frameTime is valid)
+        if (frameTime > 0.0f && frameTime < 1.0f) {
+            AnimationManager::getInstance().update(frameTime);
+        }
+        
         if (!headless) {
             sUserInput();
         }

src/McRFPy_API.cpp

@@ -1,6 +1,7 @@
 #include "McRFPy_API.h"
 #include "McRFPy_Automation.h"
 #include "platform.h"
+#include "PyAnimation.h"
 #include "GameEngine.h"
 #include "UI.h"
 #include "Resources.h"
@@ -76,6 +77,9 @@ PyObject* PyInit_mcrfpy()
         /*collections & iterators*/
         &PyUICollectionType, &PyUICollectionIterType,
         &PyUIEntityCollectionType, &PyUIEntityCollectionIterType,
+        
+        /*animation*/
+        &PyAnimationType,
         nullptr};
     int i = 0;
     auto t = pytypes[i];

src/PyAnimation.cpp

@@ -0,0 +1,234 @@
+#include "PyAnimation.h"
+#include "McRFPy_API.h"
+#include "UIDrawable.h"
+#include "UIFrame.h"
+#include "UICaption.h"
+#include "UISprite.h"
+#include "UIGrid.h"
+#include "UIEntity.h"
+#include "UI.h"  // For the PyTypeObject definitions
+#include <cstring>
+
+PyObject* PyAnimation::create(PyTypeObject* type, PyObject* args, PyObject* kwds) {
+    PyAnimationObject* self = (PyAnimationObject*)type->tp_alloc(type, 0);
+    if (self != NULL) {
+        // Will be initialized in init
+    }
+    return (PyObject*)self;
+}
+
+int PyAnimation::init(PyAnimationObject* self, PyObject* args, PyObject* kwds) {
+    static const char* keywords[] = {"property", "target", "duration", "easing", "delta", nullptr};
+    
+    const char* property_name;
+    PyObject* target_value;
+    float duration;
+    const char* easing_name = "linear";
+    int delta = 0;
+    
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "sOf|sp", const_cast<char**>(keywords),
+                                      &property_name, &target_value, &duration, &easing_name, &delta)) {
+        return -1;
+    }
+    
+    // Convert Python target value to AnimationValue
+    AnimationValue animValue;
+    
+    if (PyFloat_Check(target_value)) {
+        animValue = static_cast<float>(PyFloat_AsDouble(target_value));
+    }
+    else if (PyLong_Check(target_value)) {
+        animValue = static_cast<int>(PyLong_AsLong(target_value));
+    }
+    else if (PyList_Check(target_value)) {
+        // List of integers for sprite animation
+        std::vector<int> indices;
+        Py_ssize_t size = PyList_Size(target_value);
+        for (Py_ssize_t i = 0; i < size; i++) {
+            PyObject* item = PyList_GetItem(target_value, i);
+            if (PyLong_Check(item)) {
+                indices.push_back(PyLong_AsLong(item));
+            } else {
+                PyErr_SetString(PyExc_TypeError, "Sprite animation list must contain only integers");
+                return -1;
+            }
+        }
+        animValue = indices;
+    }
+    else if (PyTuple_Check(target_value)) {
+        Py_ssize_t size = PyTuple_Size(target_value);
+        if (size == 2) {
+            // Vector2f
+            float x = PyFloat_AsDouble(PyTuple_GetItem(target_value, 0));
+            float y = PyFloat_AsDouble(PyTuple_GetItem(target_value, 1));
+            animValue = sf::Vector2f(x, y);
+        }
+        else if (size == 3 || size == 4) {
+            // Color (RGB or RGBA)
+            int r = PyLong_AsLong(PyTuple_GetItem(target_value, 0));
+            int g = PyLong_AsLong(PyTuple_GetItem(target_value, 1));
+            int b = PyLong_AsLong(PyTuple_GetItem(target_value, 2));
+            int a = size == 4 ? PyLong_AsLong(PyTuple_GetItem(target_value, 3)) : 255;
+            animValue = sf::Color(r, g, b, a);
+        }
+        else {
+            PyErr_SetString(PyExc_ValueError, "Tuple must have 2 elements (vector) or 3-4 elements (color)");
+            return -1;
+        }
+    }
+    else if (PyUnicode_Check(target_value)) {
+        // String for text animation
+        const char* str = PyUnicode_AsUTF8(target_value);
+        animValue = std::string(str);
+    }
+    else {
+        PyErr_SetString(PyExc_TypeError, "Target value must be float, int, list, tuple, or string");
+        return -1;
+    }
+    
+    // Get easing function
+    EasingFunction easingFunc = EasingFunctions::getByName(easing_name);
+    
+    // Create the Animation
+    self->data = std::make_shared<Animation>(property_name, animValue, duration, easingFunc, delta != 0);
+    
+    return 0;
+}
+
+void PyAnimation::dealloc(PyAnimationObject* self) {
+    self->data.reset();
+    Py_TYPE(self)->tp_free((PyObject*)self);
+}
+
+PyObject* PyAnimation::get_property(PyAnimationObject* self, void* closure) {
+    return PyUnicode_FromString(self->data->getTargetProperty().c_str());
+}
+
+PyObject* PyAnimation::get_duration(PyAnimationObject* self, void* closure) {
+    return PyFloat_FromDouble(self->data->getDuration());
+}
+
+PyObject* PyAnimation::get_elapsed(PyAnimationObject* self, void* closure) {
+    return PyFloat_FromDouble(self->data->getElapsed());
+}
+
+PyObject* PyAnimation::get_is_complete(PyAnimationObject* self, void* closure) {
+    return PyBool_FromLong(self->data->isComplete());
+}
+
+PyObject* PyAnimation::get_is_delta(PyAnimationObject* self, void* closure) {
+    return PyBool_FromLong(self->data->isDelta());
+}
+
+PyObject* PyAnimation::start(PyAnimationObject* self, PyObject* args) {
+    PyObject* target_obj;
+    if (!PyArg_ParseTuple(args, "O", &target_obj)) {
+        return NULL;
+    }
+    
+    // Get the UIDrawable from the Python object
+    UIDrawable* drawable = nullptr;
+    
+    // Check type by comparing type names
+    const char* type_name = Py_TYPE(target_obj)->tp_name;
+    
+    if (strcmp(type_name, "mcrfpy.Frame") == 0) {
+        PyUIFrameObject* frame = (PyUIFrameObject*)target_obj;
+        drawable = frame->data.get();
+    }
+    else if (strcmp(type_name, "mcrfpy.Caption") == 0) {
+        PyUICaptionObject* caption = (PyUICaptionObject*)target_obj;
+        drawable = caption->data.get();
+    }
+    else if (strcmp(type_name, "mcrfpy.Sprite") == 0) {
+        PyUISpriteObject* sprite = (PyUISpriteObject*)target_obj;
+        drawable = sprite->data.get();
+    }
+    else if (strcmp(type_name, "mcrfpy.Grid") == 0) {
+        PyUIGridObject* grid = (PyUIGridObject*)target_obj;
+        drawable = grid->data.get();
+    }
+    else if (strcmp(type_name, "mcrfpy.Entity") == 0) {
+        // Special handling for Entity since it doesn't inherit from UIDrawable
+        PyUIEntityObject* entity = (PyUIEntityObject*)target_obj;
+        // Start the animation directly on the entity
+        self->data->startEntity(entity->data.get());
+        
+        // Add to AnimationManager
+        AnimationManager::getInstance().addAnimation(self->data);
+        
+        Py_RETURN_NONE;
+    }
+    else {
+        PyErr_SetString(PyExc_TypeError, "Target must be a Frame, Caption, Sprite, Grid, or Entity");
+        return NULL;
+    }
+    
+    // Start the animation
+    self->data->start(drawable);
+    
+    // Add to AnimationManager
+    AnimationManager::getInstance().addAnimation(self->data);
+    
+    Py_RETURN_NONE;
+}
+
+PyObject* PyAnimation::update(PyAnimationObject* self, PyObject* args) {
+    float deltaTime;
+    if (!PyArg_ParseTuple(args, "f", &deltaTime)) {
+        return NULL;
+    }
+    
+    bool still_running = self->data->update(deltaTime);
+    return PyBool_FromLong(still_running);
+}
+
+PyObject* PyAnimation::get_current_value(PyAnimationObject* self, PyObject* args) {
+    AnimationValue value = self->data->getCurrentValue();
+    
+    // Convert AnimationValue back to Python
+    return std::visit([](const auto& val) -> PyObject* {
+        using T = std::decay_t<decltype(val)>;
+        
+        if constexpr (std::is_same_v<T, float>) {
+            return PyFloat_FromDouble(val);
+        }
+        else if constexpr (std::is_same_v<T, int>) {
+            return PyLong_FromLong(val);
+        }
+        else if constexpr (std::is_same_v<T, std::vector<int>>) {
+            // This shouldn't happen as we interpolate to int
+            return PyLong_FromLong(0);
+        }
+        else if constexpr (std::is_same_v<T, sf::Color>) {
+            return Py_BuildValue("(iiii)", val.r, val.g, val.b, val.a);
+        }
+        else if constexpr (std::is_same_v<T, sf::Vector2f>) {
+            return Py_BuildValue("(ff)", val.x, val.y);
+        }
+        else if constexpr (std::is_same_v<T, std::string>) {
+            return PyUnicode_FromString(val.c_str());
+        }
+        
+        Py_RETURN_NONE;
+    }, value);
+}
+
+PyGetSetDef PyAnimation::getsetters[] = {
+    {"property", (getter)get_property, NULL, "Target property name", NULL},
+    {"duration", (getter)get_duration, NULL, "Animation duration in seconds", NULL},
+    {"elapsed", (getter)get_elapsed, NULL, "Elapsed time in seconds", NULL},
+    {"is_complete", (getter)get_is_complete, NULL, "Whether animation is complete", NULL},
+    {"is_delta", (getter)get_is_delta, NULL, "Whether animation uses delta mode", NULL},
+    {NULL}
+};
+
+PyMethodDef PyAnimation::methods[] = {
+    {"start", (PyCFunction)start, METH_VARARGS,
+     "Start the animation on a target UIDrawable"},
+    {"update", (PyCFunction)update, METH_VARARGS,
+     "Update the animation by deltaTime (returns True if still running)"},
+    {"get_current_value", (PyCFunction)get_current_value, METH_NOARGS,
+     "Get the current interpolated value"},
+    {NULL}
+};

src/PyAnimation.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include "Common.h"
+#include "Python.h"
+#include "structmember.h"
+#include "Animation.h"
+#include <memory>
+
+typedef struct {
+    PyObject_HEAD
+    std::shared_ptr<Animation> data;
+} PyAnimationObject;
+
+class PyAnimation {
+public:
+    static PyObject* create(PyTypeObject* type, PyObject* args, PyObject* kwds);
+    static int init(PyAnimationObject* self, PyObject* args, PyObject* kwds);
+    static void dealloc(PyAnimationObject* self);
+    
+    // Properties
+    static PyObject* get_property(PyAnimationObject* self, void* closure);
+    static PyObject* get_duration(PyAnimationObject* self, void* closure);
+    static PyObject* get_elapsed(PyAnimationObject* self, void* closure);
+    static PyObject* get_is_complete(PyAnimationObject* self, void* closure);
+    static PyObject* get_is_delta(PyAnimationObject* self, void* closure);
+    
+    // Methods
+    static PyObject* start(PyAnimationObject* self, PyObject* args);
+    static PyObject* update(PyAnimationObject* self, PyObject* args);
+    static PyObject* get_current_value(PyAnimationObject* self, PyObject* args);
+    
+    static PyGetSetDef getsetters[];
+    static PyMethodDef methods[];
+};
+
+namespace mcrfpydef {
+    static PyTypeObject PyAnimationType = {
+        .ob_base = {.ob_base = {.ob_refcnt = 1, .ob_type = NULL}, .ob_size = 0},
+        .tp_name = "mcrfpy.Animation",
+        .tp_basicsize = sizeof(PyAnimationObject),
+        .tp_itemsize = 0,
+        .tp_dealloc = (destructor)PyAnimation::dealloc,
+        .tp_flags = Py_TPFLAGS_DEFAULT,
+        .tp_doc = PyDoc_STR("Animation object for animating UI properties"),
+        .tp_methods = PyAnimation::methods,
+        .tp_getset = PyAnimation::getsetters,
+        .tp_init = (initproc)PyAnimation::init,
+        .tp_new = PyAnimation::create,
+    };
+}

src/PyScene.cpp

@@ -2,6 +2,7 @@
 #include "ActionCode.h"
 #include "Resources.h"
 #include "PyCallable.h"
+#include <algorithm>
 
 PyScene::PyScene(GameEngine* g) : Scene(g)
 {
@@ -66,7 +67,16 @@ void PyScene::render()
 {
     game->getRenderTarget().clear();
     
+    // Create a copy of the vector to sort by z_index
     auto vec = *ui_elements;
+    
+    // Sort by z_index (lower values rendered first)
+    std::sort(vec.begin(), vec.end(), 
+        [](const std::shared_ptr<UIDrawable>& a, const std::shared_ptr<UIDrawable>& b) {
+            return a->z_index < b->z_index;
+        });
+    
+    // Render in sorted order
     for (auto e: vec)
     {
         if (e)

src/UICaption.cpp

@@ -3,6 +3,7 @@
 #include "PyColor.h"
 #include "PyVector.h"
 #include "PyFont.h"
+#include <algorithm>
 
 UIDrawable* UICaption::click_at(sf::Vector2f point)
 {
@@ -198,6 +199,7 @@ PyGetSetDef UICaption::getsetters[] = {
     {"text", (getter)UICaption::get_text, (setter)UICaption::set_text, "The text displayed", NULL},
     {"size", (getter)UICaption::get_float_member, (setter)UICaption::set_float_member, "Text size (integer) in points", (void*)5},
     {"click", (getter)UIDrawable::get_click, (setter)UIDrawable::set_click, "Object called with (x, y, button) when clicked", (void*)PyObjectsEnum::UICAPTION},
+    {"z_index", (getter)UIDrawable::get_int, (setter)UIDrawable::set_int, "Z-order for rendering (lower values rendered first)", (void*)PyObjectsEnum::UICAPTION},
     {NULL}
 };
 
@@ -294,3 +296,172 @@ int UICaption::init(PyUICaptionObject* self, PyObject* args, PyObject* kwds)
     return 0;
 }
 
+// Property system implementation for animations
+bool UICaption::setProperty(const std::string& name, float value) {
+    if (name == "x") {
+        text.setPosition(sf::Vector2f(value, text.getPosition().y));
+        return true;
+    }
+    else if (name == "y") {
+        text.setPosition(sf::Vector2f(text.getPosition().x, value));
+        return true;
+    }
+    else if (name == "size") {
+        text.setCharacterSize(static_cast<unsigned int>(value));
+        return true;
+    }
+    else if (name == "outline") {
+        text.setOutlineThickness(value);
+        return true;
+    }
+    else if (name == "fill_color.r") {
+        auto color = text.getFillColor();
+        color.r = static_cast<sf::Uint8>(std::clamp(value, 0.0f, 255.0f));
+        text.setFillColor(color);
+        return true;
+    }
+    else if (name == "fill_color.g") {
+        auto color = text.getFillColor();
+        color.g = static_cast<sf::Uint8>(std::clamp(value, 0.0f, 255.0f));
+        text.setFillColor(color);
+        return true;
+    }
+    else if (name == "fill_color.b") {
+        auto color = text.getFillColor();
+        color.b = static_cast<sf::Uint8>(std::clamp(value, 0.0f, 255.0f));
+        text.setFillColor(color);
+        return true;
+    }
+    else if (name == "fill_color.a") {
+        auto color = text.getFillColor();
+        color.a = static_cast<sf::Uint8>(std::clamp(value, 0.0f, 255.0f));
+        text.setFillColor(color);
+        return true;
+    }
+    else if (name == "outline_color.r") {
+        auto color = text.getOutlineColor();
+        color.r = static_cast<sf::Uint8>(std::clamp(value, 0.0f, 255.0f));
+        text.setOutlineColor(color);
+        return true;
+    }
+    else if (name == "outline_color.g") {
+        auto color = text.getOutlineColor();
+        color.g = static_cast<sf::Uint8>(std::clamp(value, 0.0f, 255.0f));
+        text.setOutlineColor(color);
+        return true;
+    }
+    else if (name == "outline_color.b") {
+        auto color = text.getOutlineColor();
+        color.b = static_cast<sf::Uint8>(std::clamp(value, 0.0f, 255.0f));
+        text.setOutlineColor(color);
+        return true;
+    }
+    else if (name == "outline_color.a") {
+        auto color = text.getOutlineColor();
+        color.a = static_cast<sf::Uint8>(std::clamp(value, 0.0f, 255.0f));
+        text.setOutlineColor(color);
+        return true;
+    }
+    else if (name == "z_index") {
+        z_index = static_cast<int>(value);
+        return true;
+    }
+    return false;
+}
+
+bool UICaption::setProperty(const std::string& name, const sf::Color& value) {
+    if (name == "fill_color") {
+        text.setFillColor(value);
+        return true;
+    }
+    else if (name == "outline_color") {
+        text.setOutlineColor(value);
+        return true;
+    }
+    return false;
+}
+
+bool UICaption::setProperty(const std::string& name, const std::string& value) {
+    if (name == "text") {
+        text.setString(value);
+        return true;
+    }
+    return false;
+}
+
+bool UICaption::getProperty(const std::string& name, float& value) const {
+    if (name == "x") {
+        value = text.getPosition().x;
+        return true;
+    }
+    else if (name == "y") {
+        value = text.getPosition().y;
+        return true;
+    }
+    else if (name == "size") {
+        value = static_cast<float>(text.getCharacterSize());
+        return true;
+    }
+    else if (name == "outline") {
+        value = text.getOutlineThickness();
+        return true;
+    }
+    else if (name == "fill_color.r") {
+        value = text.getFillColor().r;
+        return true;
+    }
+    else if (name == "fill_color.g") {
+        value = text.getFillColor().g;
+        return true;
+    }
+    else if (name == "fill_color.b") {
+        value = text.getFillColor().b;
+        return true;
+    }
+    else if (name == "fill_color.a") {
+        value = text.getFillColor().a;
+        return true;
+    }
+    else if (name == "outline_color.r") {
+        value = text.getOutlineColor().r;
+        return true;
+    }
+    else if (name == "outline_color.g") {
+        value = text.getOutlineColor().g;
+        return true;
+    }
+    else if (name == "outline_color.b") {
+        value = text.getOutlineColor().b;
+        return true;
+    }
+    else if (name == "outline_color.a") {
+        value = text.getOutlineColor().a;
+        return true;
+    }
+    else if (name == "z_index") {
+        value = static_cast<float>(z_index);
+        return true;
+    }
+    return false;
+}
+
+bool UICaption::getProperty(const std::string& name, sf::Color& value) const {
+    if (name == "fill_color") {
+        value = text.getFillColor();
+        return true;
+    }
+    else if (name == "outline_color") {
+        value = text.getOutlineColor();
+        return true;
+    }
+    return false;
+}
+
+bool UICaption::getProperty(const std::string& name, std::string& value) const {
+    if (name == "text") {
+        value = text.getString();
+        return true;
+    }
+    return false;
+}
+

src/UICaption.h

@@ -10,6 +10,15 @@ public:
     void render(sf::Vector2f, sf::RenderTarget&) override final;
     PyObjectsEnum derived_type() override final;
     virtual UIDrawable* click_at(sf::Vector2f point) override final;
+    
+    // Property system for animations
+    bool setProperty(const std::string& name, float value) override;
+    bool setProperty(const std::string& name, const sf::Color& value) override;
+    bool setProperty(const std::string& name, const std::string& value) override;
+    
+    bool getProperty(const std::string& name, float& value) const override;
+    bool getProperty(const std::string& name, sf::Color& value) const override;
+    bool getProperty(const std::string& name, std::string& value) const override;
 
     static PyObject* get_float_member(PyUICaptionObject* self, void* closure);
     static int set_float_member(PyUICaptionObject* self, PyObject* value, void* closure);

src/UICollection.cpp

@@ -6,6 +6,7 @@
 #include "UIGrid.h"
 #include "McRFPy_API.h"
 #include "PyObjectUtils.h"
+#include <climits>
 
 using namespace mcrfpydef;
 
@@ -173,6 +174,12 @@ PyObject* UICollection::append(PyUICollectionObject* self, PyObject* o)
 	// if not UIDrawable subclass, reject it
 	// self->data->push_back( c++ object inside o );
 
+    // Ensure module is initialized
+    if (!McRFPy_API::mcrf_module) {
+        PyErr_SetString(PyExc_RuntimeError, "mcrfpy module not initialized");
+        return NULL;
+    }
+
     // this would be a great use case for .tp_base
     if (!PyObject_IsInstance(o, PyObject_GetAttrString(McRFPy_API::mcrf_module, "Frame")) &&
         !PyObject_IsInstance(o, PyObject_GetAttrString(McRFPy_API::mcrf_module, "Sprite")) &&
@@ -184,24 +191,40 @@ PyObject* UICollection::append(PyUICollectionObject* self, PyObject* o)
         return NULL;
     }
 
+    // Calculate z_index for the new element
+    int new_z_index = 0;
+    if (!self->data->empty()) {
+        // Get the z_index of the last element and add 10
+        int last_z = self->data->back()->z_index;
+        if (last_z <= INT_MAX - 10) {
+            new_z_index = last_z + 10;
+        } else {
+            new_z_index = INT_MAX;
+        }
+    }
+
     if (PyObject_IsInstance(o, PyObject_GetAttrString(McRFPy_API::mcrf_module, "Frame")))
     {
         PyUIFrameObject* frame = (PyUIFrameObject*)o;
+        frame->data->z_index = new_z_index;
         self->data->push_back(frame->data);
     }
     if (PyObject_IsInstance(o, PyObject_GetAttrString(McRFPy_API::mcrf_module, "Caption")))
     {
         PyUICaptionObject* caption = (PyUICaptionObject*)o;
+        caption->data->z_index = new_z_index;
         self->data->push_back(caption->data);
     }
     if (PyObject_IsInstance(o, PyObject_GetAttrString(McRFPy_API::mcrf_module, "Sprite")))
     {
         PyUISpriteObject* sprite = (PyUISpriteObject*)o;
+        sprite->data->z_index = new_z_index;
         self->data->push_back(sprite->data);
     }
     if (PyObject_IsInstance(o, PyObject_GetAttrString(McRFPy_API::mcrf_module, "Grid")))
     {
         PyUIGridObject* grid = (PyUIGridObject*)o;
+        grid->data->z_index = new_z_index;
         self->data->push_back(grid->data);
     }
 

src/UIDrawable.cpp

@@ -80,3 +80,68 @@ void UIDrawable::click_register(PyObject* callable)
 {
     click_callable = std::make_unique<PyClickCallable>(callable);
 }
+
+PyObject* UIDrawable::get_int(PyObject* self, void* closure) {
+    PyObjectsEnum objtype = static_cast<PyObjectsEnum>(reinterpret_cast<long>(closure));
+    UIDrawable* drawable = nullptr;
+    
+    switch (objtype) {
+        case PyObjectsEnum::UIFRAME:
+            drawable = ((PyUIFrameObject*)self)->data.get();
+            break;
+        case PyObjectsEnum::UICAPTION:
+            drawable = ((PyUICaptionObject*)self)->data.get();
+            break;
+        case PyObjectsEnum::UISPRITE:
+            drawable = ((PyUISpriteObject*)self)->data.get();
+            break;
+        case PyObjectsEnum::UIGRID:
+            drawable = ((PyUIGridObject*)self)->data.get();
+            break;
+        default:
+            PyErr_SetString(PyExc_TypeError, "Invalid UIDrawable derived instance");
+            return NULL;
+    }
+    
+    return PyLong_FromLong(drawable->z_index);
+}
+
+int UIDrawable::set_int(PyObject* self, PyObject* value, void* closure) {
+    PyObjectsEnum objtype = static_cast<PyObjectsEnum>(reinterpret_cast<long>(closure));
+    UIDrawable* drawable = nullptr;
+    
+    switch (objtype) {
+        case PyObjectsEnum::UIFRAME:
+            drawable = ((PyUIFrameObject*)self)->data.get();
+            break;
+        case PyObjectsEnum::UICAPTION:
+            drawable = ((PyUICaptionObject*)self)->data.get();
+            break;
+        case PyObjectsEnum::UISPRITE:
+            drawable = ((PyUISpriteObject*)self)->data.get();
+            break;
+        case PyObjectsEnum::UIGRID:
+            drawable = ((PyUIGridObject*)self)->data.get();
+            break;
+        default:
+            PyErr_SetString(PyExc_TypeError, "Invalid UIDrawable derived instance");
+            return -1;
+    }
+    
+    if (!PyLong_Check(value)) {
+        PyErr_SetString(PyExc_TypeError, "z_index must be an integer");
+        return -1;
+    }
+    
+    long z = PyLong_AsLong(value);
+    if (z == -1 && PyErr_Occurred()) {
+        return -1;
+    }
+    
+    // Clamp to int range
+    if (z < INT_MIN) z = INT_MIN;
+    if (z > INT_MAX) z = INT_MAX;
+    
+    drawable->z_index = static_cast<int>(z);
+    return 0;
+}

src/UIDrawable.h

@@ -42,6 +42,24 @@ public:
 
     static PyObject* get_click(PyObject* self, void* closure);
     static int set_click(PyObject* self, PyObject* value, void* closure);
+    static PyObject* get_int(PyObject* self, void* closure);
+    static int set_int(PyObject* self, PyObject* value, void* closure);
+    
+    // Z-order for rendering (lower values rendered first, higher values on top)
+    int z_index = 0;
+    
+    // Animation support
+    virtual bool setProperty(const std::string& name, float value) { return false; }
+    virtual bool setProperty(const std::string& name, int value) { return false; }
+    virtual bool setProperty(const std::string& name, const sf::Color& value) { return false; }
+    virtual bool setProperty(const std::string& name, const sf::Vector2f& value) { return false; }
+    virtual bool setProperty(const std::string& name, const std::string& value) { return false; }
+    
+    virtual bool getProperty(const std::string& name, float& value) const { return false; }
+    virtual bool getProperty(const std::string& name, int& value) const { return false; }
+    virtual bool getProperty(const std::string& name, sf::Color& value) const { return false; }
+    virtual bool getProperty(const std::string& name, sf::Vector2f& value) const { return false; }
+    virtual bool getProperty(const std::string& name, std::string& value) const { return false; }
 };
 
 typedef struct {

src/UIEntity.cpp

@@ -261,3 +261,51 @@ PyObject* UIEntity::repr(PyUIEntityObject* self) {
     std::string repr_str = ss.str();
     return PyUnicode_DecodeUTF8(repr_str.c_str(), repr_str.size(), "replace");
 }
+
+// Property system implementation for animations
+bool UIEntity::setProperty(const std::string& name, float value) {
+    if (name == "x") {
+        position.x = value;
+        collision_pos.x = static_cast<int>(value);
+        // Update sprite position based on grid position
+        // Note: This is a simplified version - actual grid-to-pixel conversion depends on grid properties
+        sprite.setPosition(sf::Vector2f(position.x, position.y));
+        return true;
+    }
+    else if (name == "y") {
+        position.y = value;
+        collision_pos.y = static_cast<int>(value);
+        // Update sprite position based on grid position
+        sprite.setPosition(sf::Vector2f(position.x, position.y));
+        return true;
+    }
+    else if (name == "sprite_scale") {
+        sprite.setScale(sf::Vector2f(value, value));
+        return true;
+    }
+    return false;
+}
+
+bool UIEntity::setProperty(const std::string& name, int value) {
+    if (name == "sprite_number") {
+        sprite.setSpriteIndex(value);
+        return true;
+    }
+    return false;
+}
+
+bool UIEntity::getProperty(const std::string& name, float& value) const {
+    if (name == "x") {
+        value = position.x;
+        return true;
+    }
+    else if (name == "y") {
+        value = position.y;
+        return true;
+    }
+    else if (name == "sprite_scale") {
+        value = sprite.getScale().x;  // Assuming uniform scale
+        return true;
+    }
+    return false;
+}

src/UIEntity.h

@@ -46,6 +46,11 @@ public:
     UIEntity();
     UIEntity(UIGrid&);
     
+    // Property system for animations
+    bool setProperty(const std::string& name, float value);
+    bool setProperty(const std::string& name, int value);
+    bool getProperty(const std::string& name, float& value) const;
+    
     static PyObject* at(PyUIEntityObject* self, PyObject* o);
     static PyObject* index(PyUIEntityObject* self, PyObject* Py_UNUSED(ignored));
     static int init(PyUIEntityObject* self, PyObject* args, PyObject* kwds);

src/UIFrame.cpp

@@ -215,6 +215,7 @@ PyGetSetDef UIFrame::getsetters[] = {
     {"outline_color", (getter)UIFrame::get_color_member, (setter)UIFrame::set_color_member, "Outline color of the rectangle", (void*)1},
     {"children", (getter)UIFrame::get_children, NULL, "UICollection of objects on top of this one", NULL},
     {"click", (getter)UIDrawable::get_click, (setter)UIDrawable::set_click, "Object called with (x, y, button) when clicked", (void*)PyObjectsEnum::UIFRAME},
+    {"z_index", (getter)UIDrawable::get_int, (setter)UIDrawable::set_int, "Z-order for rendering (lower values rendered first)", (void*)PyObjectsEnum::UIFRAME},
     {NULL}
 };
 
@@ -264,3 +265,152 @@ int UIFrame::init(PyUIFrameObject* self, PyObject* args, PyObject* kwds)
     if (err_val) return err_val;
     return 0;
 }
+
+// Animation property system implementation
+bool UIFrame::setProperty(const std::string& name, float value) {
+    if (name == "x") {
+        box.setPosition(sf::Vector2f(value, box.getPosition().y));
+        return true;
+    } else if (name == "y") {
+        box.setPosition(sf::Vector2f(box.getPosition().x, value));
+        return true;
+    } else if (name == "w") {
+        box.setSize(sf::Vector2f(value, box.getSize().y));
+        return true;
+    } else if (name == "h") {
+        box.setSize(sf::Vector2f(box.getSize().x, value));
+        return true;
+    } else if (name == "outline") {
+        box.setOutlineThickness(value);
+        return true;
+    } else if (name == "fill_color.r") {
+        auto color = box.getFillColor();
+        color.r = std::clamp(static_cast<int>(value), 0, 255);
+        box.setFillColor(color);
+        return true;
+    } else if (name == "fill_color.g") {
+        auto color = box.getFillColor();
+        color.g = std::clamp(static_cast<int>(value), 0, 255);
+        box.setFillColor(color);
+        return true;
+    } else if (name == "fill_color.b") {
+        auto color = box.getFillColor();
+        color.b = std::clamp(static_cast<int>(value), 0, 255);
+        box.setFillColor(color);
+        return true;
+    } else if (name == "fill_color.a") {
+        auto color = box.getFillColor();
+        color.a = std::clamp(static_cast<int>(value), 0, 255);
+        box.setFillColor(color);
+        return true;
+    } else if (name == "outline_color.r") {
+        auto color = box.getOutlineColor();
+        color.r = std::clamp(static_cast<int>(value), 0, 255);
+        box.setOutlineColor(color);
+        return true;
+    } else if (name == "outline_color.g") {
+        auto color = box.getOutlineColor();
+        color.g = std::clamp(static_cast<int>(value), 0, 255);
+        box.setOutlineColor(color);
+        return true;
+    } else if (name == "outline_color.b") {
+        auto color = box.getOutlineColor();
+        color.b = std::clamp(static_cast<int>(value), 0, 255);
+        box.setOutlineColor(color);
+        return true;
+    } else if (name == "outline_color.a") {
+        auto color = box.getOutlineColor();
+        color.a = std::clamp(static_cast<int>(value), 0, 255);
+        box.setOutlineColor(color);
+        return true;
+    }
+    return false;
+}
+
+bool UIFrame::setProperty(const std::string& name, const sf::Color& value) {
+    if (name == "fill_color") {
+        box.setFillColor(value);
+        return true;
+    } else if (name == "outline_color") {
+        box.setOutlineColor(value);
+        return true;
+    }
+    return false;
+}
+
+bool UIFrame::setProperty(const std::string& name, const sf::Vector2f& value) {
+    if (name == "position") {
+        box.setPosition(value);
+        return true;
+    } else if (name == "size") {
+        box.setSize(value);
+        return true;
+    }
+    return false;
+}
+
+bool UIFrame::getProperty(const std::string& name, float& value) const {
+    if (name == "x") {
+        value = box.getPosition().x;
+        return true;
+    } else if (name == "y") {
+        value = box.getPosition().y;
+        return true;
+    } else if (name == "w") {
+        value = box.getSize().x;
+        return true;
+    } else if (name == "h") {
+        value = box.getSize().y;
+        return true;
+    } else if (name == "outline") {
+        value = box.getOutlineThickness();
+        return true;
+    } else if (name == "fill_color.r") {
+        value = box.getFillColor().r;
+        return true;
+    } else if (name == "fill_color.g") {
+        value = box.getFillColor().g;
+        return true;
+    } else if (name == "fill_color.b") {
+        value = box.getFillColor().b;
+        return true;
+    } else if (name == "fill_color.a") {
+        value = box.getFillColor().a;
+        return true;
+    } else if (name == "outline_color.r") {
+        value = box.getOutlineColor().r;
+        return true;
+    } else if (name == "outline_color.g") {
+        value = box.getOutlineColor().g;
+        return true;
+    } else if (name == "outline_color.b") {
+        value = box.getOutlineColor().b;
+        return true;
+    } else if (name == "outline_color.a") {
+        value = box.getOutlineColor().a;
+        return true;
+    }
+    return false;
+}
+
+bool UIFrame::getProperty(const std::string& name, sf::Color& value) const {
+    if (name == "fill_color") {
+        value = box.getFillColor();
+        return true;
+    } else if (name == "outline_color") {
+        value = box.getOutlineColor();
+        return true;
+    }
+    return false;
+}
+
+bool UIFrame::getProperty(const std::string& name, sf::Vector2f& value) const {
+    if (name == "position") {
+        value = box.getPosition();
+        return true;
+    } else if (name == "size") {
+        value = box.getSize();
+        return true;
+    }
+    return false;
+}

src/UIFrame.h

@@ -42,6 +42,15 @@ public:
     static PyGetSetDef getsetters[];
     static PyObject* repr(PyUIFrameObject* self);
     static int init(PyUIFrameObject* self, PyObject* args, PyObject* kwds);
+    
+    // Animation property system
+    bool setProperty(const std::string& name, float value) override;
+    bool setProperty(const std::string& name, const sf::Color& value) override;
+    bool setProperty(const std::string& name, const sf::Vector2f& value) override;
+    
+    bool getProperty(const std::string& name, float& value) const override;
+    bool getProperty(const std::string& name, sf::Color& value) const override;
+    bool getProperty(const std::string& name, sf::Vector2f& value) const override;
 };
 
 namespace mcrfpydef {

src/UIGrid.cpp

@@ -458,6 +458,7 @@ PyGetSetDef UIGrid::getsetters[] = {
     {"click", (getter)UIDrawable::get_click, (setter)UIDrawable::set_click, "Object called with (x, y, button) when clicked", (void*)PyObjectsEnum::UIGRID},
 
     {"texture", (getter)UIGrid::get_texture, NULL, "Texture of the grid", NULL}, //TODO 7DRL-day2-item5
+    {"z_index", (getter)UIDrawable::get_int, (setter)UIDrawable::set_int, "Z-order for rendering (lower values rendered first)", (void*)PyObjectsEnum::UIGRID},
     {NULL}  /* Sentinel */
 };
 
@@ -723,3 +724,115 @@ PyObject* UIEntityCollection::iter(PyUIEntityCollectionObject* self)
     Py_DECREF(iterType);
     return (PyObject*)iterObj;
 }
+
+// Property system implementation for animations
+bool UIGrid::setProperty(const std::string& name, float value) {
+    if (name == "x") {
+        box.setPosition(sf::Vector2f(value, box.getPosition().y));
+        output.setPosition(box.getPosition());
+        return true;
+    }
+    else if (name == "y") {
+        box.setPosition(sf::Vector2f(box.getPosition().x, value));
+        output.setPosition(box.getPosition());
+        return true;
+    }
+    else if (name == "w" || name == "width") {
+        box.setSize(sf::Vector2f(value, box.getSize().y));
+        output.setTextureRect(sf::IntRect(0, 0, box.getSize().x, box.getSize().y));
+        return true;
+    }
+    else if (name == "h" || name == "height") {
+        box.setSize(sf::Vector2f(box.getSize().x, value));
+        output.setTextureRect(sf::IntRect(0, 0, box.getSize().x, box.getSize().y));
+        return true;
+    }
+    else if (name == "center_x") {
+        center_x = value;
+        return true;
+    }
+    else if (name == "center_y") {
+        center_y = value;
+        return true;
+    }
+    else if (name == "zoom") {
+        zoom = value;
+        return true;
+    }
+    else if (name == "z_index") {
+        z_index = static_cast<int>(value);
+        return true;
+    }
+    return false;
+}
+
+bool UIGrid::setProperty(const std::string& name, const sf::Vector2f& value) {
+    if (name == "position") {
+        box.setPosition(value);
+        output.setPosition(box.getPosition());
+        return true;
+    }
+    else if (name == "size") {
+        box.setSize(value);
+        output.setTextureRect(sf::IntRect(0, 0, box.getSize().x, box.getSize().y));
+        return true;
+    }
+    else if (name == "center") {
+        center_x = value.x;
+        center_y = value.y;
+        return true;
+    }
+    return false;
+}
+
+bool UIGrid::getProperty(const std::string& name, float& value) const {
+    if (name == "x") {
+        value = box.getPosition().x;
+        return true;
+    }
+    else if (name == "y") {
+        value = box.getPosition().y;
+        return true;
+    }
+    else if (name == "w" || name == "width") {
+        value = box.getSize().x;
+        return true;
+    }
+    else if (name == "h" || name == "height") {
+        value = box.getSize().y;
+        return true;
+    }
+    else if (name == "center_x") {
+        value = center_x;
+        return true;
+    }
+    else if (name == "center_y") {
+        value = center_y;
+        return true;
+    }
+    else if (name == "zoom") {
+        value = zoom;
+        return true;
+    }
+    else if (name == "z_index") {
+        value = static_cast<float>(z_index);
+        return true;
+    }
+    return false;
+}
+
+bool UIGrid::getProperty(const std::string& name, sf::Vector2f& value) const {
+    if (name == "position") {
+        value = box.getPosition();
+        return true;
+    }
+    else if (name == "size") {
+        value = box.getSize();
+        return true;
+    }
+    else if (name == "center") {
+        value = sf::Vector2f(center_x, center_y);
+        return true;
+    }
+    return false;
+}

src/UIGrid.h

@@ -45,6 +45,12 @@ public:
     sf::RenderTexture renderTexture;
     std::vector<UIGridPoint> points;
     std::shared_ptr<std::list<std::shared_ptr<UIEntity>>> entities;
+    
+    // Property system for animations
+    bool setProperty(const std::string& name, float value) override;
+    bool setProperty(const std::string& name, const sf::Vector2f& value) override;
+    bool getProperty(const std::string& name, float& value) const override;
+    bool getProperty(const std::string& name, sf::Vector2f& value) const override;
 
     static int init(PyUIGridObject* self, PyObject* args, PyObject* kwds);
     static PyObject* get_grid_size(PyUIGridObject* self, void* closure);

src/UISprite.cpp

@@ -58,7 +58,7 @@ void UISprite::setSpriteIndex(int _sprite_index)
     sprite = ptex->sprite(sprite_index, sprite.getPosition(), sprite.getScale());
 }
 
-sf::Vector2f UISprite::getScale()
+sf::Vector2f UISprite::getScale() const
 {
     return sprite.getScale();
 }
@@ -202,6 +202,7 @@ PyGetSetDef UISprite::getsetters[] = {
     {"sprite_number", (getter)UISprite::get_int_member, (setter)UISprite::set_int_member, "Which sprite on the texture is shown", NULL},
     {"texture", (getter)UISprite::get_texture, (setter)UISprite::set_texture,     "Texture object",                    NULL},
     {"click", (getter)UIDrawable::get_click, (setter)UIDrawable::set_click, "Object called with (x, y, button) when clicked", (void*)PyObjectsEnum::UISPRITE},
+    {"z_index", (getter)UIDrawable::get_int, (setter)UIDrawable::set_int, "Z-order for rendering (lower values rendered first)", (void*)PyObjectsEnum::UISPRITE},
     {NULL}
 };
 
@@ -245,3 +246,84 @@ int UISprite::init(PyUISpriteObject* self, PyObject* args, PyObject* kwds)
 
     return 0;
 }
+
+// Property system implementation for animations
+bool UISprite::setProperty(const std::string& name, float value) {
+    if (name == "x") {
+        sprite.setPosition(sf::Vector2f(value, sprite.getPosition().y));
+        return true;
+    }
+    else if (name == "y") {
+        sprite.setPosition(sf::Vector2f(sprite.getPosition().x, value));
+        return true;
+    }
+    else if (name == "scale") {
+        sprite.setScale(sf::Vector2f(value, value));
+        return true;
+    }
+    else if (name == "scale_x") {
+        sprite.setScale(sf::Vector2f(value, sprite.getScale().y));
+        return true;
+    }
+    else if (name == "scale_y") {
+        sprite.setScale(sf::Vector2f(sprite.getScale().x, value));
+        return true;
+    }
+    else if (name == "z_index") {
+        z_index = static_cast<int>(value);
+        return true;
+    }
+    return false;
+}
+
+bool UISprite::setProperty(const std::string& name, int value) {
+    if (name == "sprite_number") {
+        setSpriteIndex(value);
+        return true;
+    }
+    else if (name == "z_index") {
+        z_index = value;
+        return true;
+    }
+    return false;
+}
+
+bool UISprite::getProperty(const std::string& name, float& value) const {
+    if (name == "x") {
+        value = sprite.getPosition().x;
+        return true;
+    }
+    else if (name == "y") {
+        value = sprite.getPosition().y;
+        return true;
+    }
+    else if (name == "scale") {
+        value = sprite.getScale().x;  // Assuming uniform scale
+        return true;
+    }
+    else if (name == "scale_x") {
+        value = sprite.getScale().x;
+        return true;
+    }
+    else if (name == "scale_y") {
+        value = sprite.getScale().y;
+        return true;
+    }
+    else if (name == "z_index") {
+        value = static_cast<float>(z_index);
+        return true;
+    }
+    return false;
+}
+
+bool UISprite::getProperty(const std::string& name, int& value) const {
+    if (name == "sprite_number") {
+        value = sprite_index;
+        return true;
+    }
+    else if (name == "z_index") {
+        value = z_index;
+        return true;
+    }
+    return false;
+}

src/UISprite.h

@@ -33,7 +33,7 @@ public:
     void setPosition(sf::Vector2f);
     sf::Vector2f getPosition();
     void setScale(sf::Vector2f);
-    sf::Vector2f getScale();
+    sf::Vector2f getScale() const;
     void setSpriteIndex(int);
     int getSpriteIndex();
 
@@ -41,6 +41,12 @@ public:
     std::shared_ptr<PyTexture> getTexture();
 
     PyObjectsEnum derived_type() override final;
+    
+    // Property system for animations
+    bool setProperty(const std::string& name, float value) override;
+    bool setProperty(const std::string& name, int value) override;
+    bool getProperty(const std::string& name, float& value) const override;
+    bool getProperty(const std::string& name, int& value) const override;
 
 
     static PyObject* get_float_member(PyUISpriteObject* self, void* closure);

src/main.cpp

@@ -3,6 +3,8 @@
 #include "CommandLineParser.h"
 #include "McRogueFaceConfig.h"
 #include "McRFPy_API.h"
+#include "PyFont.h"
+#include "PyTexture.h"
 #include <Python.h>
 #include <iostream>
 #include <filesystem>
@@ -44,14 +46,27 @@ int run_game_engine(const McRogueFaceConfig& config)
 
 int run_python_interpreter(const McRogueFaceConfig& config, int argc, char* argv[])
 {
-    // Create a headless game engine for automation API support
+    // Create a game engine with the requested configuration
-    McRogueFaceConfig engine_config = config;
+    GameEngine* engine = new GameEngine(config);
-    engine_config.headless = true;  // Force headless mode for Python interpreter
-    GameEngine* engine = new GameEngine(engine_config);
     
     // Initialize Python with configuration
     McRFPy_API::init_python_with_config(config, argc, argv);
     
+    // Import mcrfpy module and store reference
+    McRFPy_API::mcrf_module = PyImport_ImportModule("mcrfpy");
+    if (!McRFPy_API::mcrf_module) {
+        PyErr_Print();
+        std::cerr << "Failed to import mcrfpy module" << std::endl;
+    } else {
+        // Set up default_font and default_texture if not already done
+        if (!McRFPy_API::default_font) {
+            McRFPy_API::default_font = std::make_shared<PyFont>("assets/JetbrainsMono.ttf");
+            McRFPy_API::default_texture = std::make_shared<PyTexture>("assets/kenney_tinydungeon.png", 16, 16);
+        }
+        PyObject_SetAttrString(McRFPy_API::mcrf_module, "default_font", McRFPy_API::default_font->pyObject());
+        PyObject_SetAttrString(McRFPy_API::mcrf_module, "default_texture", McRFPy_API::default_texture->pyObject());
+    }
+    
     // Handle different Python modes
     if (!config.python_command.empty()) {
         // Execute command from -c
@@ -161,6 +176,9 @@ int run_python_interpreter(const McRogueFaceConfig& config, int argc, char* argv
             PyRun_InteractiveLoop(stdin, "<stdin>");
         }
         
+        // Run the game engine after script execution
+        engine->run();
+        
         Py_Finalize();
         delete engine;
         return result;

tests/animation_demo.py

@@ -0,0 +1,165 @@
+#!/usr/bin/env python3
+"""Animation System Demo - Shows all animation capabilities"""
+
+import mcrfpy
+import math
+
+# Create main scene
+mcrfpy.createScene("animation_demo")
+ui = mcrfpy.sceneUI("animation_demo")
+mcrfpy.setScene("animation_demo")
+
+# Title
+title = mcrfpy.Caption((400, 30), "McRogueFace Animation System Demo", mcrfpy.default_font)
+title.size = 24
+title.fill_color = (255, 255, 255)
+# Note: centered property doesn't exist for Caption
+ui.append(title)
+
+# 1. Position Animation Demo
+pos_frame = mcrfpy.Frame(50, 100, 80, 80)
+pos_frame.fill_color = (255, 100, 100)
+pos_frame.outline = 2
+ui.append(pos_frame)
+
+pos_label = mcrfpy.Caption((50, 80), "Position Animation", mcrfpy.default_font)
+pos_label.fill_color = (200, 200, 200)
+ui.append(pos_label)
+
+# 2. Size Animation Demo
+size_frame = mcrfpy.Frame(200, 100, 50, 50)
+size_frame.fill_color = (100, 255, 100)
+size_frame.outline = 2
+ui.append(size_frame)
+
+size_label = mcrfpy.Caption((200, 80), "Size Animation", mcrfpy.default_font)
+size_label.fill_color = (200, 200, 200)
+ui.append(size_label)
+
+# 3. Color Animation Demo
+color_frame = mcrfpy.Frame(350, 100, 80, 80)
+color_frame.fill_color = (255, 0, 0)
+ui.append(color_frame)
+
+color_label = mcrfpy.Caption((350, 80), "Color Animation", mcrfpy.default_font)
+color_label.fill_color = (200, 200, 200)
+ui.append(color_label)
+
+# 4. Easing Functions Demo
+easing_y = 250
+easing_frames = []
+easings = ["linear", "easeIn", "easeOut", "easeInOut", "easeInElastic", "easeOutBounce"]
+
+for i, easing in enumerate(easings):
+    x = 50 + i * 120
+    
+    frame = mcrfpy.Frame(x, easing_y, 20, 20)
+    frame.fill_color = (100, 150, 255)
+    ui.append(frame)
+    easing_frames.append((frame, easing))
+    
+    label = mcrfpy.Caption((x, easing_y - 20), easing, mcrfpy.default_font)
+    label.size = 12
+    label.fill_color = (200, 200, 200)
+    ui.append(label)
+
+# 5. Complex Animation Demo
+complex_frame = mcrfpy.Frame(300, 350, 100, 100)
+complex_frame.fill_color = (128, 128, 255)
+complex_frame.outline = 3
+ui.append(complex_frame)
+
+complex_label = mcrfpy.Caption((300, 330), "Complex Multi-Property", mcrfpy.default_font)
+complex_label.fill_color = (200, 200, 200)
+ui.append(complex_label)
+
+# Start animations
+def start_animations(runtime):
+    # 1. Position animation - back and forth
+    x_anim = mcrfpy.Animation("x", 500.0, 3.0, "easeInOut")
+    x_anim.start(pos_frame)
+    
+    # 2. Size animation - pulsing
+    w_anim = mcrfpy.Animation("w", 150.0, 2.0, "easeInOut")
+    h_anim = mcrfpy.Animation("h", 150.0, 2.0, "easeInOut")
+    w_anim.start(size_frame)
+    h_anim.start(size_frame)
+    
+    # 3. Color animation - rainbow cycle
+    color_anim = mcrfpy.Animation("fill_color", (0, 255, 255, 255), 2.0, "linear")
+    color_anim.start(color_frame)
+    
+    # 4. Easing demos - all move up with different easings
+    for frame, easing in easing_frames:
+        y_anim = mcrfpy.Animation("y", 150.0, 2.0, easing)
+        y_anim.start(frame)
+    
+    # 5. Complex animation - multiple properties
+    cx_anim = mcrfpy.Animation("x", 500.0, 4.0, "easeInOut")
+    cy_anim = mcrfpy.Animation("y", 400.0, 4.0, "easeOut")
+    cw_anim = mcrfpy.Animation("w", 150.0, 4.0, "easeInElastic")
+    ch_anim = mcrfpy.Animation("h", 150.0, 4.0, "easeInElastic")
+    outline_anim = mcrfpy.Animation("outline", 10.0, 4.0, "linear")
+    
+    cx_anim.start(complex_frame)
+    cy_anim.start(complex_frame)
+    cw_anim.start(complex_frame)
+    ch_anim.start(complex_frame)
+    outline_anim.start(complex_frame)
+    
+    # Individual color component animations
+    r_anim = mcrfpy.Animation("fill_color.r", 255.0, 4.0, "easeInOut")
+    g_anim = mcrfpy.Animation("fill_color.g", 100.0, 4.0, "easeInOut") 
+    b_anim = mcrfpy.Animation("fill_color.b", 50.0, 4.0, "easeInOut")
+    
+    r_anim.start(complex_frame)
+    g_anim.start(complex_frame)
+    b_anim.start(complex_frame)
+    
+    print("All animations started!")
+
+# Reverse some animations
+def reverse_animations(runtime):
+    # Position back
+    x_anim = mcrfpy.Animation("x", 50.0, 3.0, "easeInOut")
+    x_anim.start(pos_frame)
+    
+    # Size back
+    w_anim = mcrfpy.Animation("w", 50.0, 2.0, "easeInOut")
+    h_anim = mcrfpy.Animation("h", 50.0, 2.0, "easeInOut")
+    w_anim.start(size_frame)
+    h_anim.start(size_frame)
+    
+    # Color cycle continues
+    color_anim = mcrfpy.Animation("fill_color", (255, 0, 255, 255), 2.0, "linear")
+    color_anim.start(color_frame)
+    
+    # Easing frames back down
+    for frame, easing in easing_frames:
+        y_anim = mcrfpy.Animation("y", 250.0, 2.0, easing)
+        y_anim.start(frame)
+
+# Continue color cycle
+def cycle_colors(runtime):
+    color_anim = mcrfpy.Animation("fill_color", (255, 255, 0, 255), 2.0, "linear")
+    color_anim.start(color_frame)
+
+# Info text
+info = mcrfpy.Caption((400, 550), "Watch as different properties animate with various easing functions!", mcrfpy.default_font)
+info.fill_color = (255, 255, 200)
+# Note: centered property doesn't exist for Caption
+ui.append(info)
+
+# Schedule animations
+mcrfpy.setTimer("start", start_animations, 500)
+mcrfpy.setTimer("reverse", reverse_animations, 4000)
+mcrfpy.setTimer("cycle", cycle_colors, 2500)
+
+# Exit handler
+def on_key(key):
+    if key == "Escape":
+        mcrfpy.exit()
+
+mcrfpy.keypressScene(on_key)
+
+print("Animation demo started! Press Escape to exit.")