Canvas
A basic example:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Canvas</title>
</head>
<body>
<canvas id="canvas" style="border: 2px dotted gold; width: 100vw; height: 100vh"></canvas>
<script>
var canvas = document.getElementById("canvas");
if(canvas.getContext){
var ctx = canvas.getContext("2d");
ctx.fillRect(90,60,120,60); //X, Y, WIDTH, HEIGHT
}
else{
alert('Your browser doesn't support HTML canvas');
}
</script>
</body>
</html>
Examples of ‘command’:
ctx.fillStyle = "#FF0000";
//Rectangle
ctx.fillRect(0,0,150,75);
//Line
ctx.moveTo(0,0);
ctx.lineTo(200,100);
ctx.stroke();
//Circle
ctx.beginPath();
ctx.arc(95,50,40,0,2*Math.PI);
ctx.stroke();
//Create gradient
var grd=ctx.createLinearGradient(0,0,200,0);
grd.addColorStop(0,"red");
grd.addColorStop(1,"white");
//Fill with gradient
ctx.fillStyle=grd;
ctx.fillRect(10,10,150,80);
//Text
ctx.font = "30px Arial";
ctx.fillText("Hello World",10,50); //or ctx.strokeText("Hello World",10,50);
ctx.fillStyle = "red";
ctx.textAlign = "center";
ctx.fillText("Hello World", canvas.width/2, canvas.height/2);
//Image
var img = document.getElementById("scream"); //or url
ctx.drawImage(img, 10, 10);