JavaScript canvas2d object method: arcTo()
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The
arcTo() method of the JavaScript
DOM object returned
by the getContext("2d")
method applied to the HTML <canvas>
element creates a circular arc between two tangents.
It
has the following syntax with the following parameters.
context.arcTo(x, y, r, startAngle,
endAngle, counterclockwise)
Parameter
|
Required / Optional
|
Description
|
xstart
|
Required
|
x-coordinate of start
tangent
|
ystart
|
Required
|
y-coordinate of start
tangent
|
xend
|
Required
|
x-coordinate of end
tangent
|
yend
|
Required
|
y-coordinate of end
tangent
|
r
|
Required
|
Radius of arc
|
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", "200");
x2.setAttribute("style", "border: 1px solid black");
var c2 = x2.getContext("2d");
c2.beginPath();
c2.moveTo(20, 30);
c2.lineTo(60, 30);
c2.arcTo(110, 30, 110, 80, 50);
c2.lineTo(110, 120);
c2.stroke();
document.getElementById("element").appendChild(x2);
</script>
</body>
</html>
|
FUNCTION THAT MAY ASSIST IN TESTING WHETHER FEATURE IS SUPPORTED:
function isSupportedJavaScriptMethodCanvas2dArcTo() {
var x = document.createElement("CANVAS"); var c = x.getContext("2d"); return !!c.arcTo;
} |
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