CanvasRenderingContext2D.isPointInPath()

The CanvasRenderingContext2D.isPointInPath() method of the Canvas 2D API reports whether or not the specified point is contained in the current path.

Syntax

boolean ctx.isPointInPath(x, y);
boolean ctx.isPointInPath(x, y, fillRule);

boolean ctx.isPointInPath(path, x, y);
boolean ctx.isPointInPath(path, x, y, fillRule);

Parameters

x
The X coordinate of the point to check.
y
The Y coordinate of the point to check.
fillRule
The algorithm by which to determine if a point is inside a path or outside a path.
Possible values:
path
A Path2D path to use.

Return value

Boolean
A Boolean, which is true if the specified point is contained in the current or specified path, otherwise false.

Examples

Using the isPointInPath method

This is just a simple code snippet which uses the isPointinPath method to check if a point is in the current path.

HTML

<canvas id="canvas"></canvas>

JavaScript

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');

ctx.rect(10, 10, 100, 100);
ctx.stroke();
console.log(ctx.isPointInPath(10, 10)); // true

Edit the code below, see your changes update live in the canvas and watch for loggings in your console:

Playable code
<canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas>
<div class="playable-buttons">
  <input id="edit" type="button" value="Edit" />
  <input id="reset" type="button" value="Reset" />
</div>
<textarea id="code" class="playable-code">
ctx.rect(10, 10, 100, 100);
ctx.stroke();
console.log(ctx.isPointInPath(10, 10)); // true</textarea>
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var textarea = document.getElementById("code");
var reset = document.getElementById("reset");
var edit = document.getElementById("edit");
var code = textarea.value;

function drawCanvas() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  eval(textarea.value);
}

reset.addEventListener("click", function() {
  textarea.value = code;
  drawCanvas();
});

edit.addEventListener("click", function() {
  textarea.focus();
})

textarea.addEventListener("input", drawCanvas);
window.addEventListener("load", drawCanvas);

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'CanvasRenderingContext2D.isPointInPath' in that specification.
Living Standard  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support YesEdge Full support 12Firefox Full support YesIE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes
Path parameterChrome Full support YesEdge Full support YesFirefox Full support 31IE No support NoOpera Full support YesSafari No support NoWebView Android ? Chrome Android ? Edge Mobile Full support YesFirefox Android Full support 31Opera Android ? Safari iOS ? Samsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

Compatibility notes

  • Prior to Gecko 7.0 (Firefox 7.0 / Thunderbird 7.0 / SeaMonkey 2.4), this method incorrectly failed to multiply the specified point's coordinates by the current transformation matrix before comparing it to the path. Now this method works correctly even if the context is rotated, scaled, or otherwise transformed.

See also

Document Tags and Contributors

Contributors to this page: fscholz, nmve, arronei, erikadoyle, notetienne
Last updated by: fscholz,