<!DOCTYPE html>
<html>
<head>
<canvas id="canvas" width="150" height="150"></canvas>

<script>

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.transform(1,0.5,-0.5,1,30,10);
ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, 100, 100);

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