HTML Canvas Animation Move ball from left to right

Description

HTML Canvas Animation Move ball from left to right

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<!doctype html>
<html lang="en">
<head>

</head>/*from w w  w  .  java 2s  .co  m*/
<body>
<canvas id="canvasOne" width="500" height="500">
 Your browser does not support the HTML 5 Canvas. 
</canvas>

<script type="text/javascript">
canvasApp();
function canvasApp() {
  function  drawScreen () {
    context.fillStyle = '#EEEEEE';
    context.fillRect(0, 0, theCanvas.width, theCanvas.height);
    //Box
    context.strokeStyle = '#000000'; 
    context.strokeRect(1,  1, theCanvas.width-2, theCanvas.height-2);
    
    // Create ball
    
    if (moves > 0 ) {
      moves--;
      ball.x += xunits;
      ball.y += yunits;
    }
    
    context.fillStyle = "#000000";
    context.beginPath();
    context.arc(ball.x,ball.y,15,0,Math.PI*2,true);
    context.closePath();
    context.fill();
    
        
  }
  var speed = 5;
  var p1 = {x:20,y:250};
  var p2 = {x:480,y:250};
  var dx = p2.x - p1.x;
  var dy = p2.y - p1.y;
  var distance = Math.sqrt(dx*dx + dy*dy);
  var moves = distance/speed;
  var xunits = (p2.x - p1.x)/moves;
  var yunits = (p2.y - p1.y)/moves;
  var ball = {x:p1.x, y:p1.y};
  var points = new Array();
  
  theCanvas = document.getElementById('canvasOne');
  context = theCanvas.getContext('2d');
  
  function gameLoop() {
      window.setTimeout(gameLoop, 20);
      drawScreen()  
    }
    
  gameLoop();
  
  
}


</script>


</body>
</html>



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