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key_final.html
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<!DOCTYPE html>
<html><head><meta charset="utf-8"><title>Skookum Labs - http://labs.skookum.com/demos/barcampclt_physics/</title></head>
<body>
<canvas id="surface" width="600" height="400"></canvas>
<script>
// Version 0: Position
var ball = {
x: 300,
y: 200,
r: 15
};
var x = 150;
var y = 100;
var r = 15;
var dx = 5;
var dy = 5;
var WIDTH = 800;
var HEIGHT = 600;
var canvas = document.getElementById("surface");
var ctx = canvas.getContext('2d');
function doKeyDown(evt){
switch (evt.keyCode) {
case 38: /* Up arrow was pressed */
if (y - dy > 0){
y -= dy;
}
break;
case 40: /* Down arrow was pressed */
if (y + dy < HEIGHT){
y += dy;
}
break;
case 37: /* Left arrow was pressed */
if (x - dx > 0){
x -= dx;
}
break;
case 39: /* Right arrow was pressed */
if (x + dx < WIDTH){
x += dx;
}
break;
}
}
function draw() {
// Clear display
ctx.save();
ctx.fillStyle = "rgba(0, 255, 255, 1)";
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.restore();
// Draw rectangle
ctx.save();
ctx.fillStyle = "white";
ctx.strokeStyle = "black";
ctx.beginPath();
ctx.rect(100,200,200,100);
ctx.closePath();
ctx.fill();
ctx.stroke();
//draw ball
ctx.fillStyle = "purple";
ctx.beginPath();
ctx.arc(x, y, r, 0, Math.PI*2, true);
ctx.fill();
}
setInterval(draw, 10);
window.addEventListener('keydown',doKeyDown,true);
</script>
</body></html>