var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.fillStyle="yellow";
ctx.fillRect(0,0,250,100)
ctx.setTransform(1,0.5,-0.5,1,30,10);
ctx.fillStyle="red";
ctx.fillRect(0,0,250,100);
ctx.setTransform(1,0.5,-0.5,1,30,10);
ctx.fillStyle="blue";
ctx.fillRect(0,0,250,100);
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