html5examples/CreateArrayOfImageCanvas.html at master · Pakz001/html5examples · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no">
<style>
#myCanvas {touch-action: none;
-webkit-touch-callout:none;
-webkit-user-select:none;
-khtml-user-select:none;
-moz-user-select:none;
-ms-user-select:none;
user-select:none;
-webkit-tap-highlight-color:rgba(0,0,0,0);
}
</style>
</head>
<body bgcolor="black">
<canvas id="myCanvas" width="320" height="240" style="border:0px solid #d3d3d3;">
Use different browser.
</canvas>

<script>
		//
		// random poly rock asteroid shape(red)
		//
	var c=document.getElementById("myCanvas");
	var ctx=c.getContext("2d");

	var q=[];

	for(var i=0;i<64;i++){
		var s = (Math.random()*32)+16;
		q.push(rock(s));
			//ctx.drawImage(img,Math.random()*c.width,Math.random()*c.height);

			//ctx.fillStyle="#ffffff";
			//ctx.fillRect(Math.random()*c.width,Math.random()*c.height,10,10);
		//ctx.drawImage(img,100,100);

	}
gameloop=setInterval(doGameLoop,333);
function doGameLoop(){
myCanvas.width = window.innerWidth;
myCanvas.height = window.innerHeight-32;
myCanvas.width = window.innerWidth-32;
ctx.fillStyle="rgb(100,0,0)";
ctx.fillRect(0,0,c.width,c.height);
ctx.fillStyle="rgb(255,255,255)";
ctx.fillText("Drawing a tilemap example.",10,10);
for(var i=0;i<q.length;i++){
ctx.drawImage(q[i],Math.random()*c.width,Math.random()*c.height);
}
}


	function rock(s){
		var x = s;
		var y = s;
		const offscreenCanvas = document.getElementById("myCanvas");
	 	offscreenCanvas.width = s*4;
	    offscreenCanvas.height = s*4;
		const offscreenCtx = offscreenCanvas.getContext("2d");

	  	canvasAsImage = new Image(s,s);
//		offscreenCtx.fillStyle = '#000000';
//		offscreenCtx.fillRect(0,0,s,s);

		offscreenCtx.fillStyle = '#ffffff';
		offscreenCtx.beginPath();
		offscreenCtx.moveTo(x,y);
		var stp=(Math.PI*2)/((Math.random()*5)+16);
		var rad,x1,y1;
		for(var a=0;a<(Math.PI*2);a+=stp){
			rad = (Math.random()*8)+s;
		 	x1=rad*Math.cos(a);
			y1=rad*Math.sin(a);
			offscreenCtx.lineTo(x+x1,y+y1);
		}
		rad = (Math.random()*8)+s;
		x1=rad*Math.cos(0);
		y1=rad*Math.sin(0);
		offscreenCtx.lineTo(x+x1,y+y1);
		offscreenCtx.closePath();
		offscreenCtx.fill();

		canvasAsImage.src = offscreenCanvas.toDataURL();
		 offscreenCanvas.width = 1;
	    offscreenCanvas.height = 1;

		return canvasAsImage;
	}

</script>
</body>
</html>