HTML canvas scale() Method

Introduction

Draw a rectangle, scale to 200%, then draw rectangle again:

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<!DOCTYPE html>
<html>
<body>

<canvas id="myCanvas" width="300" height="180" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>

<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");

ctx.strokeRect(5, 5, 25, 15);/*from   w w  w .j av a2  s. c  o  m*/
ctx.scale(2, 2);
ctx.strokeRect(5, 5, 25, 15);
</script>

</body>
</html>

The scale() method scales the current drawing, bigger or smaller.

If you scale a drawing, all future drawings will also be scaled. 

context.scale(scalewidth, scaleheight);

Parameter Values

Parameter Description
scalewidth Scales the width of the current drawing (1=100%, 0.5=50%, 2=200%, etc.)
scaleheight Scales the height of the current drawing (1=100%, 0.5=50%, 2=200%, etc.)



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