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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-es-
       sen.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  en-
       courage	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)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHOR

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