CanvasRenderingContext2D.strokeStyle

The CanvasRenderingContext2D.strokeStyle property of the Canvas 2D API specifies the color or style to use for the lines around shapes. The default is #000 (black).

See also the chapter 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 repetitive image).

Examples

Using the strokeStyle property to set a different color

This is just a simple code snippet using the strokeStyle property to set a different color.

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);

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

<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.strokeStyle = 'blue';
ctx.strokeRect(10, 10, 100, 100);</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);

A strokeStyle example

This example uses the strokeStyle property to change the colors of the shapes' outlines. We use the arc() method to draw circles instead of squares.

var ctx = document.getElementById('canvas').getContext('2d');
for (var i = 0; i < 6; i++) {
  for (var 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();
  }
}

<canvas id="canvas" width="150" height="150"></canvas>

The result looks like this:

Screenshot	Live sample

Specifications

Browser compatibility

WebKit/Blink-specific notes

• In WebKit- and Blink-based browsers, a non-standard and deprecated method ctx.setStrokeColor() is implemented besides 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 it, CanvasRenderingContext2D
• CanvasGradient
• CanvasPattern