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GLLINEWIDTH(3G)			 OpenGL Manual		       GLLINEWIDTH(3G)

NAME
       glLineWidth - specify the width of rasterized lines

C SPECIFICATION
       void glLineWidth(GLfloat width);

PARAMETERS
       width
	   Specifies the width of rasterized lines. The initial value is 1.

DESCRIPTION
       glLineWidth specifies the rasterized width of both aliased and
       antialiased lines. Using a line width other than 1 has different
       effects, depending on whether line antialiasing is enabled. To enable
       and disable line antialiasing, call glEnable() and glDisable() with
       argument GL_LINE_SMOOTH. Line antialiasing is initially disabled.

       If line antialiasing is disabled, the actual width is determined by
       rounding the supplied width to the nearest integer. (If the rounding
       results in the value 0, it is as if the line width were 1.) If Δ x >= Δ
       y, i pixels are filled in each column that is rasterized, where i is
       the rounded value of width. Otherwise, i pixels are filled in each row
       that is rasterized.

       If antialiasing is enabled, line rasterization produces a fragment for
       each pixel square that intersects the region lying within the rectangle
       having width equal to the current line width, length equal to the
       actual length of the line, and centered on the mathematical line
       segment. The coverage value for each fragment is the window coordinate
       area of the intersection of the rectangular region with the
       corresponding pixel square. This value is saved and used in the final
       rasterization step.

       Not all widths can be supported when line antialiasing is enabled. If
       an unsupported width is requested, the nearest supported width is used.
       Only width 1 is guaranteed to be supported; others depend on the
       implementation. Likewise, there is a range for aliased line widths as
       well. To query the range of supported widths and the size difference
       between supported widths within the range, call glGet() with arguments
       GL_ALIASED_LINE_WIDTH_RANGE, GL_SMOOTH_LINE_WIDTH_RANGE, and
       GL_SMOOTH_LINE_WIDTH_GRANULARITY.

NOTES
       The line width specified by glLineWidth is always returned when
       GL_LINE_WIDTH is queried. Clamping and rounding for aliased and
       antialiased lines have no effect on the specified value.

       Nonantialiased line width may be clamped to an implementation-dependent
       maximum. Call glGet() with GL_ALIASED_LINE_WIDTH_RANGE to determine the
       maximum width.

       In OpenGL 1.2, the tokens GL_LINE_WIDTH_RANGE and
       GL_LINE_WIDTH_GRANULARITY were replaced by GL_ALIASED_LINE_WIDTH_RANGE,
       GL_SMOOTH_LINE_WIDTH_RANGE, and GL_SMOOTH_LINE_WIDTH_GRANULARITY. The
       old names are retained for backward compatibility, but should not be
       used in new code.

ERRORS
       GL_INVALID_VALUE is generated if width is less than or equal to 0.

ASSOCIATED GETS
       glGet() with argument GL_LINE_WIDTH

       glGet() with argument GL_ALIASED_LINE_WIDTH_RANGE

       glGet() with argument GL_SMOOTH_LINE_WIDTH_RANGE

       glGet() with argument GL_SMOOTH_LINE_WIDTH_GRANULARITY

       glIsEnabled() with argument GL_LINE_SMOOTH

SEE ALSO
       glEnable()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013		       GLLINEWIDTH(3G)
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