<!DOCTYPE html> | |
<body> | |
<canvas id="canvas" width="400" height="800"></canvas> | |
</body> | |
<script> | |
var canvas = document.getElementById('canvas'); | |
canvas.style.width = (canvas.width / 2) + 'px'; | |
canvas.style.height = (canvas.height / 2) + 'px'; | |
var ctx = canvas.getContext('2d'); | |
ctx.scale(2, 2); | |
ctx.fillStyle = 'green'; | |
ctx.fillRect(0, 0, 100, 150); | |
ctx.fillStyle = 'red'; | |
ctx.fillRect(0, 150, 200, 250); | |
</script> |