The CanvasRenderingContext2D
.shadowColor
property of the Canvas 2D API specifies the color of shadows.
Be aware that the shadow's rendered opacity will be affected by the opacity of the fillStyle
color when filling, and of the strokeStyle
color when stroking.
Note: Shadows are only drawn if the shadowColor
property is set to a non-transparent value. One of the shadowBlur
, shadowOffsetX
, or shadowOffsetY
properties must be non-zero, as well.
Syntax
ctx.shadowColor = color;
Examples
Adding a shadow to shapes
This example adds a shadow to two squares; the first one is filled, and the second one is stroked. The shadowColor
property sets the shadows' color, while shadowOffsetX
and shadowOffsetY
set their position relative to the shapes.
HTML
<canvas id="canvas"></canvas>
JavaScript
const canvas = document.getElementById('canvas'); const ctx = canvas.getContext('2d'); // Shadow ctx.shadowColor = 'red'; ctx.shadowOffsetX = 10; ctx.shadowOffsetY = 10; // Filled rectangle ctx.fillRect(20, 20, 100, 100); // Stroked rectangle ctx.lineWidth = 6; ctx.strokeRect(170, 20, 100, 100);
Result
Shadows on translucent shapes
A shadow's opacity is affected by the transparency level of its parent object (even when shadowColor
specifies a completely opaque value). This example strokes and fills a rectangle with translucent colors.
HTML
<canvas id="canvas"></canvas>
JavaScript
The resulting alpha value of the fill shadow is .8 * .2
, or .16
. The alpha of the stroke shadow is .8 * .6
, or .48
.
const canvas = document.getElementById('canvas'); const ctx = canvas.getContext('2d'); // Shadow ctx.shadowColor = 'rgba(255, 0, 0, .8)'; ctx.shadowBlur = 8; ctx.shadowOffsetX = 30; ctx.shadowOffsetY = 20; // Filled rectangle ctx.fillStyle = 'rgba(0, 255, 0, .2)'; ctx.fillRect(10, 10, 150, 100); // Stroked rectangle ctx.lineWidth = 10; ctx.strokeStyle = 'rgba(0, 0, 255, .6)'; ctx.strokeRect(10, 10, 150, 100);
Result
Specifications
Specification | Status | Comment |
HTML Living StandardThe definition of 'CanvasRenderingContext2D.shadowColor' in that specification. | Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
shadowColor
|
Chrome
Full support Yes |
Edge
Full support 12 |
Firefox
Full support 1.5 |
IE
Full support Yes |
Opera
Full support Yes |
Safari
Full support Yes |
WebView Android
Full support Yes |
Chrome Android
Full support Yes |
Firefox Android
Full support 4 |
Opera Android
Full support Yes |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support Yes |
Legend
- Full support
- Full support
WebKit/Blink-specific notes
In WebKit- and Blink-based browsers, the non-standard and deprecated method ctx.setShadow()
is implemented besides this property.
setShadow(width, height, blur, color, alpha);
setShadow(width, height, blur, graylevel, alpha);
setShadow(width, height, blur, r, g, b, a);
setShadow(width, height, blur, c, m, y, k, a);
See also
- The interface defining this property:
CanvasRenderingContext2D
CanvasRenderingContext2D.shadowColor by Mozilla Contributors is licensed under CC-BY-SA 2.5.