CanvasRenderingContext2D.lineWidth - Web APIs 编辑
The CanvasRenderingContext2D
.lineWidth
property of the Canvas 2D API sets the thickness of lines.
Note: Lines can be drawn with the stroke()
, strokeRect()
, and strokeText()
methods.
Syntax
ctx.lineWidth = value;
Options
value
- A number specifying the line width, in coordinate space units. Zero, negative,
Infinity
, andNaN
values are ignored. This value is1.0
by default.
Examples
Changing line width
This example draws a line and a rectangle, using a line width of 15 units.
HTML
<canvas id="canvas"></canvas>
JavaScript
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
ctx.lineWidth = 15;
ctx.beginPath();
ctx.moveTo(20, 20);
ctx.lineTo(130, 130);
ctx.rect(40, 40, 70, 70);
ctx.stroke();
Result
More examples
For more examples and explanation about this property, see Applying styles and color in the Canvas Tutorial.
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'CanvasRenderingContext2D.lineWidth' in that specification. | Living Standard |
Browser compatibility
BCD tables only load in the browser
WebKit/Blink-specific notes
- In WebKit- and Blink-based Browsers, a non-standard and deprecated method
ctx.setLineWidth()
is implemented in addition to this property.
Gecko-specific notes
- Starting Gecko 2.0 (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1), setting
lineWidth
to a negative value no longer throws an exception; instead, it properly ignores non-positive values.
See also
- The interface defining this property:
CanvasRenderingContext2D
CanvasRenderingContext2D.lineCap
CanvasRenderingContext2D.lineJoin
- Applying styles and color
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