JavaScript canvas2d object method: rotate()
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The rotate()
method of the JavaScript
DOM object
returned by the getContext("2d")
method applied to the HTML <canvas>
element rotates the current drawing. It only affects drawings made after the
rotation is applied
It has the following
syntax with the following parameters.
context.rotate(angle)
Parameter
|
Required / Optional
|
Description
|
angle
|
Required
|
Angle in radians
|
EXAMPLE:
HTML USED IN THIS EXAMPLE:
<!DOCTYPE html>
<html> <!-- Copyright (c) Nematrian Limited 2018 -->
<head></head>
<body>
<span id="element"></span>
<script>
var x2 = document.createElement("CANVAS");
x2.setAttribute("width", "200");
x2.setAttribute("height", "100");
x2.setAttribute("style", "border: 1px solid black");
var c2 = x2.getContext("2d");
c2.strokeStyle = "blue";
c2.strokeRect(60, 10, 40, 30);
c2.rotate(20 * (2 * Math.PI/360));
c2.strokeStyle = "red";
c2.strokeRect(60, 10, 40, 30);
document.getElementById("element").appendChild(x2);
</script>
</body>
</html>
|
FUNCTION THAT MAY ASSIST IN TESTING WHETHER FEATURE IS SUPPORTED:
function isSupportedJavaScriptMethodCanvas2dRotate() {
var x = document.createElement("CANVAS"); var c = x.getContext("2d"); return !!c.rotate;
} |
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