scale() Method - Javascript Canvas Reference

Javascript examples for Canvas Reference:scale

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Description

The scale() method scales the current drawing.

JavaScript syntax 

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.)

Example

Draw a rectangle and scale.

Demo Code

ResultView the demo in separate window 

<!DOCTYPE html>
<html>
<body>

<canvas id="myCanvas" width="300" height="170" 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 a  v  a  2  s.c o m*/
ctx.scale(2, 2);
ctx.strokeRect(5, 5, 25, 15);
ctx.scale(2, 2);
ctx.strokeRect(5, 5, 25, 15);
ctx.scale(2, 2);
ctx.strokeRect(5, 5, 25, 15);

</script>

</body>
</html>

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