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.
boolean ctx.isPointInStroke(x, y); boolean ctx.isPointInStroke(path, x, y);
path
Path2D
path to use.Boolean
true
if the point is inside the area contained by the stroking of a path, otherwise false
.isPointInStroke
methodThis 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.
<canvas id="canvas"></canvas>
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:
<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);
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'CanvasRenderingContext2D.isPointInStroke' in that specification. | Living Standard |
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Path parameter | (Yes) | 31 (31) | No support | (Yes) | No support |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Path parameter | ? | ? | 31.0 (31) | ? | ? | ? |
CanvasRenderingContext2D
.
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/isPointInStroke