linewidth(3G)

NAME
     linewidth, linewidthf - specifies width of lines

C SPECIFICATION
     void linewidth(n)
     short n;

     void linewidthf(n)
     float n;

PARAMETERS
     n    is the width of the line.  The width is measured in pixels and is 1
          by default.

DESCRIPTION
     linewidth specifies the width of a line. Mathematical lines have no
     width, but to display a line, it must be assigned a width.  The center of
     the displayed line is as close as possible to the mathematical line.  If
     antialiased line drawing is not enabled, and multisample is not enabled,
     or multisample buffers do not exist in the current framebuffer
     configuration in the current drawmode, n indicates the number of pixels
     across the minor axis of the line, and is rounded to the nearest integer.
     Otherwise, n indicates the line width in units of pixels, and is rounded
     to the nearest supported value.  For example, linewidth 0 is rounded to
     one.

     Rounding affects only the value of n that is actually used, not the value
     that is retained.

SEE ALSO
     linesmooth, setlinestyle

NOTES
     The maximum width of aliased lines is 255.

     IRIS-4D VGX model supports antialiased line widths 1.0 and 2.0, and
     aliased line widths one through 255.  IRIS-4D G, GT, and GTX models, the
     Personal Iris, Indy, Iris Entry, XL, XS, XS24, XZ, Elan and Extreme
     systems support antialiased line width 1.0, and aliased line widths one
     through 255.

     On IRIS-4D models that support resetls, it must be set to TRUE to obtain
     reasonable results with line widths greater than one.

     In order to select or pick a wide line in selecting or picking mode
     respectively, the selecting region must intersect the displayed line
     center.  This center is the imaginary line of width 1 specified by the
     same end vertices as the displayed line.  In case of a very wide line,
     you may want to consider drawing a filled rectangle instead.