CanvasRenderingContext2D: lineWidth property

{{APIRef("Canvas API")}}

The CanvasRenderingContext2D.lineWidth property of the Canvas 2D API sets the thickness of lines.

[!NOTE] Lines can be drawn with the {{domxref("CanvasRenderingContext2D.stroke()", "stroke()")}}, {{domxref("CanvasRenderingContext2D.strokeRect()", "strokeRect()")}}, and {{domxref("CanvasRenderingContext2D.strokeText()", "strokeText()")}} methods.

Value

A number specifying the line width, in coordinate space units. Zero, negative, {{jsxref("Infinity")}}, and {{jsxref("NaN")}} values are ignored. This value is 1.0 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

{{ EmbedLiveSample('Changing_line_width', 700, 180) }}

More examples

For more examples and explanation about this property, see Applying styles and color in the Canvas Tutorial.

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• The interface defining this property: {{domxref("CanvasRenderingContext2D")}}
• {{domxref("CanvasRenderingContext2D.lineCap")}}
• {{domxref("CanvasRenderingContext2D.lineJoin")}}
• Applying styles and color