HTML Canvas Animation Move In Circle

Description

HTML Canvas Animation Move In Circle

View in separate window 

<!doctype html>
<html lang="en">
<body>  
<canvas id="canvasOne" width="500" height="500">
 Your browser does not support the HTML 5 Canvas. 
</canvas>/*  ww  w  .  j  a  va 2  s  .c o m*/
<script type="text/javascript">
  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);
    
    ball.x = circle.centerX + Math.cos(circle.angle) * circle.radius;
    ball.y = circle.centerY + Math.sin(circle.angle) * circle.radius;
    
    circle.angle += ball.speed;
  
    context.fillStyle = "#000000";
    context.beginPath();
    context.arc(ball.x,ball.y,15,0,Math.PI*2,true);
    context.closePath();
    context.fill();
  
  }
  
  let radius = 100;
  let circle = {centerX:250, centerY:250, radius:125, angle:0}
  let ball = {x:0, y:0,speed:.1};
    
    theCanvas = document.getElementById('canvasOne');
  context = theCanvas.getContext('2d');
  
  function gameLoop() {
      window.setTimeout(gameLoop, 20);
      drawScreen()  
    }
    
  gameLoop();

</script>

</body>
</html>



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