CanvasGradient.addColorStop()

The CanvasGradient.addColorStop() method adds a new stop, defined by an offset and a color, to the gradient. If the offset is not between 0 and 1, an INDEX_SIZE_ERR is raised, if the color can't be parsed as a CSS <color>, a SYNTAX_ERR is raised.

Syntax

JavaScript
void <var>gradient.addColorStop(offset, color);</var>

Parameters

offset
A number between 0 and 1. An INDEX_SIZE_ERR is raised, if the number is not in that range.
color
A CSS <color>. A SYNTAX_ERR is raised, if the value can not be parsed as a CSS <color> value.

Examples

Using the addColorStop method

This is just a simple code snippet which uses the addColorStop method with a CanvasGradient object.

HTML

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

JavaScript

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

var gradient = ctx.createLinearGradient(0,0,200,0);
gradient.addColorStop(0,"green");
gradient.addColorStop(1,"white");
ctx.fillStyle = gradient;
ctx.fillRect(10,10,200,100);

Edit the code below and see your changes update live in the canvas:

Playable code
HTML
<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">
var gradient = ctx.createLinearGradient(0,0,200,0);
gradient.addColorStop(0,"green");
gradient.addColorStop(1,"white");
ctx.fillStyle = gradient;
ctx.fillRect(10,10,200,100);</textarea>
JavaScript
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
WHATWG HTML Living Standard
The definition of 'CanvasGradient.addColorStop' in that specification.
Living Standard  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

See also

License

© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/canvasgradient/addcolorstop

API Canvas CanvasGradient Gradients Method Reference Référence