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WebGLRenderingContext.lineWidth

The WebGLRenderingContext.lineWidth() method of the WebGL API sets the line width of rasterized lines.

The webgl spec, based on the OpenGL ES 2.0/3.0 specs points out that the minimum and maximum width for a line is implementation defined. The maximum minimum width is allowed to be 1.0. The minimum maximum width is also allowed to be 1.0. Because of these implementation defined limits it is not recommended to use line widths other than 1.0 since there is no guarantee any user's browser will display any other width.

As of January 2017 most implementations of WebGL only support a minimum of 1 and a maximum of 1 as the technology they are based on has these same limits.

Syntax

void gl.lineWidth(width);

Parameters

width: A GLfloat specifying the width of rasterized lines. Default value: 1.

Return value

None.

Examples

Setting the line width:

gl.lineWidth(5);

Getting the line width:

gl.getParameter(gl.LINE_WIDTH);

Getting the range of available widths. Returns a Float32Array.

gl.getParameter(gl.ALIASED_LINE_WIDTH_RANGE);

Specifications

Specification	Status	Comment
WebGL 1.0 The definition of 'lineWidth' in that specification.	Recommendation	Initial definition.
OpenGL ES 2.0 The definition of 'glLineWidth' in that specification.	Standard	Man page of the OpenGL API.

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	No	12	No	No	No	No

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	No	No	No	No	No	No	No