The CanvasRenderingContext2D.strokeStyle
property of the Canvas 2D API specifies the color, gradient, or pattern to use for the strokes (outlines) around shapes. The default is #000
(black).
For more examples of stroke and fill styles, see Applying styles and color in the Canvas tutorial.
Syntax
ctx.strokeStyle = color; ctx.strokeStyle = gradient; ctx.strokeStyle = pattern;
Options
color
- A
DOMString
parsed as CSS<color>
value. gradient
- A
CanvasGradient
object (a linear or radial gradient). pattern
- A
CanvasPattern
object (a repeating image).
Examples
Changing the stroke color of a shape
This example applies a blue stroke color to a rectangle.
HTML
<canvas id="canvas"></canvas>
JavaScript
var canvas = document.getElementById('canvas'); var ctx = canvas.getContext('2d'); ctx.strokeStyle = 'blue'; ctx.strokeRect(10, 10, 100, 100);
Result
Creating multiple stroke colors using loops
In this example, we use two for
loops and the arc()
method to draw a grid of circles, each having a different stroke color. To achieve this, we use the two variables i
and j
to generate a unique RGB color for each circle, and only modify the green and blue values. (The red channel has a fixed value.)
<canvas id="canvas" width="150" height="150"></canvas>
var ctx = document.getElementById('canvas').getContext('2d'); for (let i = 0; i < 6; i++) { for (let j = 0; j < 6; j++) { ctx.strokeStyle = `rgb( 0, ${Math.floor(255 - 42.5 * i)}, ${Math.floor(255 - 42.5 * j)})`; ctx.beginPath(); ctx.arc(12.5 + j * 25, 12.5 + i * 25, 10, 0, Math.PI * 2, true); ctx.stroke(); } }
The result looks like this:
Screenshot | Live sample |
---|---|
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'CanvasRenderingContext2D.strokeStyle' in that specification. |
Living Standard |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
strokeStyle | 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 note
In WebKit- and Blink-based browsers, the non-standard and deprecated method ctx.setStrokeColor()
is implemented in addition to this property.
setStrokeColor(color, optional alpha); setStrokeColor(grayLevel, optional alpha); setStrokeColor(r, g, b, a); setStrokeColor(c, m, y, k, a);
See also
- The interface defining this property:
CanvasRenderingContext2D
CanvasGradient
CanvasPattern