gl_striangle man page
gl_striangle — draw a solid colored triangle
void gl_striangle(int x0, int y0, int x1, int y1 , int x2, int y2, int color, int bf);
Draws a non-interpolated (solid) triangle between the three points 0, 1 and 2 with the color color.
The bf value is used to tell the routine not to draw the triangle if it is facing the other way. bf tells which way the triangle should be facing to be drawn. since you will more than likely require both combinations.
bf = 0 disables drawing when the points are arranged clockwise, bf = 1 disables drawing when the points are arranged counter clockwise. bf = -1 will probably always draw the triangle.
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 threeDkit/ 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/ subdirectory. As of this writing, svgalib-1.2.12.tar.gz is the latest version 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.
vgagl(7), svgalib(7), threedkit(7), gl_swtriangle(3), gl_triangle(3), gl_trigetcolorlookup(3), gl_trisetcolorlookup(3), gl_trisetdrawpoint(3), gl_wtriangle(3), plane(6), wrapdemo(6).
This manual page was edited by Michael Weller <email@example.com>. The demos, the initial documentation and the whole threedkit stuff was done by Paul Sheer <firstname.lastname@example.org>.
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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.
gl_swtriangle(3), gl_triangle(3), gl_trisetcolorlookup(3), gl_trisetdrawpoint(3), gl_wtriangle(3), threedkit(7), vgagl(7).