82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
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#include "Animation.h"
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// linear interpolation constructor
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template<typename T>
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Animation<T>::Animation(float _d, T _ev, T* _t, std::function<void()> _cb, bool _l)
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:duration(_d), endvalue(_ev), target(_t), callback(_cb), loop(_l),
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index(-1), startvalue(*_t), elapsed(0.0f) {}
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// discrete values constructor
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template<typename T>
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Animation<T>::Animation(float _d, std::vector<T> _v, T* _t, std::function<void()> _cb, bool _l)
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:duration(_d), target(_t), callback(_cb), values(_v), loop(_l),
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index(0), startvalue(*_t), elapsed(0.0f), nonelapsed(0.0f) {
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timestep = _v.size() / _d;
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}
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template<typename T>
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Animation<T>::~Animation() {
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// deconstructor sets target to desired end state (no partial values)
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cancel();
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}
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template<>
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void Animation<std::string>::lerp() {
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*target = endvalue.substr(0, endvalue.length() * (elapsed / duration));
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}
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template<>
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void Animation<int>::lerp() {
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int delta = endvalue - startvalue;
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*target = startvalue + (elapsed / duration * delta);
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}
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template<>
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void Animation<float>::lerp() {
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int delta = endvalue - startvalue;
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*target = startvalue + (elapsed / duration * delta);
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}
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template<>
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void Animation<sf::Vector2f>::lerp() {
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int delta_x = endvalue.x - startvalue.x;
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int delta_y = endvalue.y - startvalue.y;
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target->x = startvalue.x + (elapsed / duration * delta_x);
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target->y = startvalue.y + (elapsed / duration * delta_y);
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}
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template<>
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void Animation<sf::Vector2i>::lerp() {
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int delta_x = endvalue.x - startvalue.y;
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int delta_y = endvalue.y - startvalue.y;
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target->x = startvalue.x + (elapsed / duration * delta_x);
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target->y = startvalue.y + (elapsed / duration * delta_y);
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}
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template<typename T>
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void Animation<T>::step(float delta)
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{
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if (index == -1) {
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// lerp function
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elapsed += delta;
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lerp();
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}
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else {
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nonelapsed += delta;
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if (nonelapsed < timestep) return;
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if (index == values.size() - 1) return;
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elapsed += nonelapsed; // or should it be += timestep?
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nonelapsed = 0; // or should it -= timestep?
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index++;
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*target = values[index];
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}
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}
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template<typename T>
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void Animation<T>::cancel() {
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if (index == -1)
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*target = endvalue;
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else
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*target = values[values.size() - 1];
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}
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