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gl_swtriangle(3)	      Svgalib User Manual	      gl_swtriangle(3)

NAME
       gl_swtriangle - draw a solid pixmap mapped on a triangle

SYNOPSIS
       #include <triangle.h>

       typedef struct {
	   unsigned char *bitmap1;
	   unsigned char *bitmap2;
	   int bf;
       } TD_tridata;

       void  gl_swtriangle(int	x0, int y0, int xd0, int yd0 , int x1, int y1,
       int xd1, int yd1 , int x2, int y2, int xd2, int yd2, int c,  TD_tridata
       *tri);

DESCRIPTION
       Draws  a	 triangle  at points 0, 1, 2 by mapping the pixmaps defined in
       the TD_triangle structure into the triangle.

       The xd and yd values represent the triangle on the bitmap and the x and
       y values represent the triangle on the screen.

       bitmap1 defines the back side of the triangle, bitmap2 the front.

       The  bf value is used to tell the routine to draw the backside if it is
       facing the other way.  bf tells which way the triangle should be facing
       to  show the front, since you will more than likely require both combi‐
       nations.

       bf = 2 defines the back to be drawn when the points are arranged clock‐
       wise,  bf = 3 defines the back to be drawn when the points are arranged
       counter clockwise, bf = -1 will probably always draw the front.

       Beware, these functions are not a direct part of the  svgalib  library.
       Instead their source is part of svgalib and can be found in the threeD‐
       kit/ subdirectory of the original svgalib distribution. However, it  is
       not  installed  in  the system by default, s.t. it is unclear where you
       can find it if your svgalib was installed by some linux distribution.

       In case of any such problem, simply get an  svgalib  distribution  from
       the  net. Yo don't need to install it. Just make in the threeDkit/ sub‐
       directory. As of this writing, svgalib-1.2.12.tar.gz is the latest ver‐
       sion   and   can	  be   retrieved   by	ftp  from  sunsite.unc.edu  at
       /pub/Linux/libs/graphics and tsx-11.mit.edu at  /pub/linux/sources/libs
       which will most probably be mirrored by a site close to you.

       The  functions  are  defined in the tri.o and triangl.o files (or their
       resp. sources) which you must link to your program.

SEE ALSO
       vgagl(7), svgalib(7), threedkit(7),  gl_striangle(3),  gl_wtriangle(3),
       gl_triangle(3),	  gl_trigetcolorlookup(3),    gl_trisetcolorlookup(3),
       gl_trisetdrawpoint(3), plane(6), wrapdemo(6).

AUTHOR
       This manual page was edited  by	Michael	 Weller	 <eowmob@exp-math.uni-
       essen.de>. The demos, the initial documentation and the whole threedkit
       stuff was done by Paul Sheer <psheer@icon.co.za>.

       Paper mail:
	      Paul Sheer
	      P O BOX 890507
	      Lyndhurst
	      Johannesburg 2106
	      South Africa

       Donations (by check or postal  order)  will  be	appreciated  and  will
       encourage  further  development	of  this  software.  However  this  is
       strictly on a voluntary basis where this software falls under  the  GNU
       LIBRARY GENERAL PUBLIC LICENSE.

Svgalib (>= 1.2.11)		  2 Aug 1997		      gl_swtriangle(3)
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