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gl_wtriangle(3)		      Svgalib User Manual	       gl_wtriangle(3)

NAME
       gl_wtriangle - draw a shadowed pixmap mapped on a triangle

SYNOPSIS
       #include <triangle.h>

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

       void  gl_wtriangle(int  x0,  int y0, int xd0, int yd0, int z0 , int x1,
       int y1, int xd1, int yd1, int z1 , int x2, int y2, int  xd2,  int  yd2,
       int z2, 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. The z values represent
       an additional value which will be added to the color that is looked  up
       from the pixmap data. Once again, if the current context is more than 8
       bits then the result is interpreted as an index to the same lookup  ta‐
       ble. See gl_triangle(3) for more details on shadowing.

       gl_wtriangle is used to draw wrapped surfaces with shadowing interpola‐
       tion. The function gl_swtriangle(3) does it without shadowing.

       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_swtriangle(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_wtriangle(3)
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