HTML5 - Beginners - drawLine function.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width" />
</head>
<body bgcolor="black">
<div id="test"></div>
<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>
<canvas id="myCanvas" width="320" height="240" style="border:0px solid #d3d3d3;">
Use different browser.
</canvas>
	<script>
	var c=document.getElementById("myCanvas");
	var ctx=c.getContext("2d");

	gameloop=setInterval(doGameLoop,16);

	function doGameLoop(){
		myCanvas.height = window.innerHeight-32;
		myCanvas.width = window.innerWidth-32;
		ctx.fillStyle="rgb(0,0,0)";
		ctx.fillRect(0,0,c.width,c.height);
		ctx.fillStyle="rgb(255,255,255)";
		ctx.fillText("Javascript Html canvas example.",10,10); 
		//
		ctx.strokeStyle = 'red';
		ctx.lineWidth = 5;
		drawLine(0,0,100,100);
	}
	// Draw a line from x,y to x,y
	// Set lineWidth = x and 
	// strokeStyle = x before using.
	function drawLine(x1,y1,x2,y2){
		ctx.beginPath();
		ctx.moveTo(x1,y1);
		ctx.lineTo(x2,y2);
		ctx.stroke();
	}
</script>
</body>
</html>