From a5363271ef53768c61d67c2d40ae08e1540ec4bf Mon Sep 17 00:00:00 2001
From: Aaron Simpkins <awsimpkins@gmail.com>
Date: Thu, 17 Sep 2020 22:14:10 -0400
Subject: [PATCH] pong html code and modified pong code for gunfight

---
 gunfight.html | 204 ++++++++++++++++++++++++++++++++++++++++++++++++++
 pong.html     | 197 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 401 insertions(+)
 create mode 100644 gunfight.html
 create mode 100644 pong.html
diff --git a/gunfight.html b/gunfight.html
new file mode 100644
index 0000000..599e257
--- /dev/null
+++ b/gunfight.html
@@ -0,0 +1,204 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title></title>
+  <style>
+  html, body {
+    height: 100%;
+    margin: 0;
+  }
+  body {
+    background: black;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+  }
+  </style>
+</head>
+<body>
+<canvas width="565" height="500" id="game"></canvas>
+<script>
+const canvas = document.getElementById('game');
+const context = canvas.getContext('2d');
+const grid = 15;
+const playerHeight = grid * 3; // 45
+const maxPlayerY = canvas.height - grid - playerHeight;
+
+var playerSpeed = 4;
+
+const leftPlayer = {
+  // start in the middle of the game on the left side
+  x: grid * 2,
+  y: canvas.height / 2 - playerHeight / 2,
+  width: grid,
+  height: playerHeight,
+  
+  // shooting cooldown
+  cooldown: 0,
+  
+  // player velocity
+  dy: 0
+};
+
+const rightPlayer = {
+  // start in the middle of the game on the right side
+  x: canvas.width - grid * 3,
+  y: canvas.height / 2 - playerHeight / 2,
+  width: grid,
+  height: playerHeight,
+  
+  // shooting cooldown
+  cooldown: 0,
+  
+  // player velocity
+  dy: 0
+};
+
+const bullets = {
+  speed: 5,
+  array: []
+}
+
+// check for collision between two objects using axis-aligned bounding box (AABB)
+// @see https://developer.mozilla.org/en-US/docs/Games/Techniques/2D_collision_detection
+function collides(obj1, obj2) {
+  return obj1.x < obj2.x + obj2.width &&
+         obj1.x + obj1.width > obj2.x &&
+         obj1.y < obj2.y + obj2.height &&
+         obj1.y + obj1.height > obj2.y;
+}
+
+// game loop
+function loop() {
+  requestAnimationFrame(loop);
+  context.clearRect(0,0,canvas.width,canvas.height);
+  
+  // bullet cooldowns
+  // left player
+  if (leftPlayer.cooldown > 0) {
+    leftPlayer.cooldown--;
+  }
+  // right player
+  if (rightPlayer.cooldown > 0) {
+    rightPlayer.cooldown--;
+  }
+  
+  // move players by their velocity
+  leftPlayer.y += leftPlayer.dy;
+  rightPlayer.y += rightPlayer.dy;
+  
+  // prevent players from going through walls
+  if (leftPlayer.y < grid) {
+    leftPlayer.y = grid;
+  }
+  else if (leftPlayer.y > maxPlayerY) {
+    leftPlayer.y = maxPlayerY;
+  }
+  
+  if (rightPlayer.y < grid) {
+    rightPlayer.y = grid;
+  }
+  else if (rightPlayer.y > maxPlayerY) {
+    rightPlayer.y = maxPlayerY;
+  }
+  
+  // draw bullets
+  context.fillStyle = 'yellow';
+  bullets.array.forEach(function(bullet, index) {
+    context.fillRect(bullet.x, bullet.y, 10, 5);
+	
+	// check if the bullet hits a player
+	// left player
+	if (collides(bullet, leftPlayer)) {
+	  bullets.array.splice(index, 1);
+	  leftPlayer.y = canvas.height / 2 - playerHeight / 2;
+	  rightPlayer.y = canvas.height / 2 - playerHeight / 2;
+	  bullets.array.length = 0;
+	}
+	// right player
+	else if (collides(bullet, rightPlayer)) {
+	  bullets.array.splice(index, 1);
+	  leftPlayer.y = canvas.height / 2 - playerHeight / 2;
+	  rightPlayer.y = canvas.height / 2 - playerHeight / 2;
+	  bullets.array.length = 0;
+	}
+    
+    // move bullets
+    bullet.x += bullet.dx;
+	
+	// remove bullets that leave the screen
+    if (bullet.x < 0 || bullet.x > canvas.width) {
+      bullets.array.splice(index, 1);
+    }
+  });
+  
+  // draw paddles
+  context.fillStyle = 'gold';
+  context.fillRect(leftPlayer.x, leftPlayer.y, leftPlayer.width, leftPlayer.height);
+  context.fillRect(rightPlayer.x, rightPlayer.y, rightPlayer.width, rightPlayer.height);
+
+  // draw walls
+  context.fillStyle = 'lightgray';
+  context.fillRect(0, 0, canvas.width, grid);
+  context.fillRect(0, canvas.height - grid, canvas.width, canvas.height);
+}
+
+// listen to keyboard events to move the players
+document.addEventListener('keydown', function(e) {
+  // up arrow key
+  if (e.which === 38) {
+    rightPlayer.dy = -playerSpeed;
+  }
+  // down arrow key
+  else if (e.which === 40) {
+    rightPlayer.dy = playerSpeed;
+  }
+  
+  // w key
+  if (e.which === 87) {
+    leftPlayer.dy = -playerSpeed;
+  }
+  // a key
+  else if (e.which === 83) {
+    leftPlayer.dy = playerSpeed;
+  }
+  
+  // shooting
+  // left arrow key
+  if (e.which === 37 && rightPlayer.cooldown === 0) {
+    bullets.array.push({
+	  x: rightPlayer.x - 10, 
+	  y: rightPlayer.y + 20, 
+	  width: 10,
+	  height: 5,
+	  dx: -bullets.speed
+	});
+	rightPlayer.cooldown = 25;
+  }
+  // d key
+  if (e.which === 68 && leftPlayer.cooldown === 0) {
+    bullets.array.push({
+	  x: leftPlayer.x + 15, 
+	  y: leftPlayer.y + 20, 
+	  width: 10,
+	  height: 5,
+	  dx: bullets.speed
+	});
+	leftPlayer.cooldown = 25;
+  }
+});
+// listen to keyboard events to stop the player if key is released
+document.addEventListener('keyup', function(e) {
+  if (e.which === 38 || e.which === 40) {
+    rightPlayer.dy = 0;
+  }
+  
+  if (e.which === 83 || e.which === 87) {
+    leftPlayer.dy = 0;
+  }
+});
+// start the game
+requestAnimationFrame(loop);
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/pong.html b/pong.html
new file mode 100644
index 0000000..cbff7d7
--- /dev/null
+++ b/pong.html
@@ -0,0 +1,197 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title></title>
+  <style>
+  html, body {
+    height: 100%;
+    margin: 0;
+  }
+
+  body {
+    background: black;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+  }
+  </style>
+</head>
+<body>
+<canvas width="750" height="585" id="game"></canvas>
+<script>
+const canvas = document.getElementById('game');
+const context = canvas.getContext('2d');
+const grid = 15;
+const paddleHeight = grid * 5; // 80
+const maxPaddleY = canvas.height - grid - paddleHeight;
+
+var paddleSpeed = 6;
+var ballSpeed = 5;
+
+const leftPaddle = {
+  // start in the middle of the game on the left side
+  x: grid * 2,
+  y: canvas.height / 2 - paddleHeight / 2,
+  width: grid,
+  height: paddleHeight,
+
+  // paddle velocity
+  dy: 0
+};
+const rightPaddle = {
+  // start in the middle of the game on the right side
+  x: canvas.width - grid * 3,
+  y: canvas.height / 2 - paddleHeight / 2,
+  width: grid,
+  height: paddleHeight,
+
+  // paddle velocity
+  dy: 0
+};
+const ball = {
+  // start in the middle of the game
+  x: canvas.width / 2,
+  y: canvas.height / 2,
+  width: grid,
+  height: grid,
+
+  // keep track of when need to reset the ball position
+  resetting: false,
+
+  // ball velocity (start going to the top-right corner)
+  dx: ballSpeed,
+  dy: -ballSpeed
+};
+
+// check for collision between two objects using axis-aligned bounding box (AABB)
+// @see https://developer.mozilla.org/en-US/docs/Games/Techniques/2D_collision_detection
+function collides(obj1, obj2) {
+  return obj1.x < obj2.x + obj2.width &&
+         obj1.x + obj1.width > obj2.x &&
+         obj1.y < obj2.y + obj2.height &&
+         obj1.y + obj1.height > obj2.y;
+}
+
+// game loop
+function loop() {
+  requestAnimationFrame(loop);
+  context.clearRect(0,0,canvas.width,canvas.height);
+
+  // move paddles by their velocity
+  leftPaddle.y += leftPaddle.dy;
+  rightPaddle.y += rightPaddle.dy;
+
+  // prevent paddles from going through walls
+  if (leftPaddle.y < grid) {
+    leftPaddle.y = grid;
+  }
+  else if (leftPaddle.y > maxPaddleY) {
+    leftPaddle.y = maxPaddleY;
+  }
+
+  if (rightPaddle.y < grid) {
+    rightPaddle.y = grid;
+  }
+  else if (rightPaddle.y > maxPaddleY) {
+    rightPaddle.y = maxPaddleY;
+  }
+
+  // draw paddles
+  context.fillStyle = 'white';
+  context.fillRect(leftPaddle.x, leftPaddle.y, leftPaddle.width, leftPaddle.height);
+  context.fillRect(rightPaddle.x, rightPaddle.y, rightPaddle.width, rightPaddle.height);
+
+  // move ball by its velocity
+  ball.x += ball.dx;
+  ball.y += ball.dy;
+
+  // prevent ball from going through walls by changing its velocity
+  if (ball.y < grid) {
+    ball.y = grid;
+    ball.dy *= -1;
+  }
+  else if (ball.y + grid > canvas.height - grid) {
+    ball.y = canvas.height - grid * 2;
+    ball.dy *= -1;
+  }
+
+  // reset ball if it goes past paddle (but only if we haven't already done so)
+  if ( (ball.x < 0 || ball.x > canvas.width) && !ball.resetting) {
+    ball.resetting = true;
+
+    // give some time for the player to recover before launching the ball again
+    setTimeout(() => {
+      ball.resetting = false;
+      ball.x = canvas.width / 2;
+      ball.y = canvas.height / 2;
+    }, 400);
+  }
+
+  // check to see if ball collides with paddle. if they do change x velocity
+  if (collides(ball, leftPaddle)) {
+    ball.dx *= -1;
+
+    // move ball next to the paddle otherwise the collision will happen again
+    // in the next frame
+    ball.x = leftPaddle.x + leftPaddle.width;
+  }
+  else if (collides(ball, rightPaddle)) {
+    ball.dx *= -1;
+
+    // move ball next to the paddle otherwise the collision will happen again
+    // in the next frame
+    ball.x = rightPaddle.x - ball.width;
+  }
+
+  // draw ball
+  context.fillRect(ball.x, ball.y, ball.width, ball.height);
+
+  // draw walls
+  context.fillStyle = 'lightgrey';
+  context.fillRect(0, 0, canvas.width, grid);
+  context.fillRect(0, canvas.height - grid, canvas.width, canvas.height);
+
+  // draw dotted line down the middle
+  for (let i = grid; i < canvas.height - grid; i += grid * 2) {
+    context.fillRect(canvas.width / 2 - grid / 2, i, grid, grid);
+  }
+}
+
+// listen to keyboard events to move the paddles
+document.addEventListener('keydown', function(e) {
+
+  // up arrow key
+  if (e.which === 38) {
+    rightPaddle.dy = -paddleSpeed;
+  }
+  // down arrow key
+  else if (e.which === 40) {
+    rightPaddle.dy = paddleSpeed;
+  }
+
+  // w key
+  if (e.which === 87) {
+    leftPaddle.dy = -paddleSpeed;
+  }
+  // a key
+  else if (e.which === 83) {
+    leftPaddle.dy = paddleSpeed;
+  }
+});
+
+// listen to keyboard events to stop the paddle if key is released
+document.addEventListener('keyup', function(e) {
+  if (e.which === 38 || e.which === 40) {
+    rightPaddle.dy = 0;
+  }
+
+  if (e.which === 83 || e.which === 87) {
+    leftPaddle.dy = 0;
+  }
+});
+
+// start the game
+requestAnimationFrame(loop);
+</script>
+</body>
+</html>
\ No newline at end of file
