CanvasRenderingContext2D.isPointInStroke()

The CanvasRenderingContext2D.isPointInStroke() method of the Canvas 2D API reports whether or not the specified point is inside the area contained by the stroking of a path.

Syntax

boolean ctx.isPointInStroke(x, y);
boolean ctx.isPointInStroke(path, x, y);

Parameters

x
The X coordinate of the point to check.
y
The Y coordinate of the point to check.
path
A Path2D path to use.

Return value

Boolean
A Boolean, which is true if the point is inside the area contained by the stroking of a path, otherwise false.

Examples

Using the isPointInStroke method

This is just a simple code snippet which uses the isPointInStroke method to check if a point is inside the area contained by the stroking of a 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.isPointInStroke(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.isPointInStroke(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.isPointInStroke' in that specification.
Living Standard  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes No Yes No Yes Yes
Path parameter Yes Yes31 No Yes No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes Yes Yes Yes Yes
Path parameter ? ? Yes31 ? ? ?

See also

Document Tags and Contributors

Contributors to this page: fscholz, nmve
Last updated by: fscholz,