HTML 5 canvas keydown event animation - Javascript Canvas

Javascript examples for Canvas:Animation

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Description

HTML 5 canvas keydown event animation

Demo Code

ResultView the demo in separate window 

<html>
   <head> 
      <meta name="viewport" content="width=device-width, initial-scale=1"> 
      <script type="text/javascript" src="https://code.jquery.com/jquery-2.1.0.js"></script> 
      <script type="text/javascript">
    $(window).load(function(){/* www  .  jav  a 2 s.c  om*/
var main = function (){
    canvas = document.getElementById("canvas");
    window.addEventListener("keydown", doKeyDown, true);
    ctx = canvas.getContext("2d");
    ctx.fillStyle = "rgba(0, 0, 255, 1)"
    ctx.fillRect(20, 20, 20, 15);
    x = 30;
    y = 30;
};
$(document).ready(main);
    function doKeyDown(key) {

        if (key.keyCode == 87) { //w
            clearCanvas();
            y = y - 10;
            ctx.fillStyle = "rgba(0, 0, 255, 1)"
            ctx.fillRect(x, y, 20, 15)
        }
        if (key.keyCode == 83) { //s
            clearCanvas();
            y = y + 10;
            ctx.fillStyle = "rgba(0, 0, 255, 1)"
            ctx.fillRect(x, y, 20, 15)
        }
        if (key.keyCode == 65) { //a
            clearCanvas();
            y = x - 10;
            ctx.fillStyle = "rgba(0, 0, 255, 1)"
            ctx.fillRect(x, y, 20, 15)
        }
        if (key.keyCode == 68) { //d
            clearCanvas();
            y = x + 10;
            ctx.fillStyle = "rgba(0, 0, 255, 1)"
            ctx.fillRect(x, y, 20, 15)
        }
    }
    function clearCanvas() {
        canvas.width = canvas.width;
    }
    });

      </script> 
   </head> 
   <body> 
      <canvas id="canvas" width="400" height="500"></canvas>  
   </body>
</html>

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