JavaScript canvas2d object method: transform()
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The transform() method of the JavaScript
DOM object returned
by the getContext("2d")
method applied to the HTML <canvas>
element applies a transformation to the current drawing.
It
has the following syntax with the following parameters:
context.transform(x1,x2,x3,x4,
x5, x6)
Parameter
|
Required / Optional
|
Description
|
x1
|
Required
|
Horizontal scaling
|
x2
|
Required
|
Horizontal skew
|
x3
|
Required
|
Vertical skew
|
x4
|
Required
|
Vertical scaling
|
x5
|
Required
|
Horizontal moving
|
x6
|
Required
|
Vertical moving
|
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(10, 10, 40, 30);
c2.transform(1, 0.4, -0.2, 1.3, 30, 15);
c2.strokeStyle = "red";
c2.strokeRect(10, 10, 40, 30);
document.getElementById("element").appendChild(x2);
</script>
</body>
</html>
|
FUNCTION THAT MAY ASSIST IN TESTING WHETHER FEATURE IS SUPPORTED:
function isSupportedJavaScriptMethodCanvas2dTransform() {
var x = document.createElement("CANVAS"); var c = x.getContext("2d"); return !!c.transform;
} |
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