Last Change: 2018-09-07, 16:50
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gl_line − draw a line
#include <vgagl.h>
void gl_line(int x1, int y1, int x2, int y2, int c);
Draw a line from point (x1, y1) to (x2, y2) inclusively in color c.
You should not assume that the same drawing trajectory is used when you exchange start and end points.
To use this program one first sets up a mode with a regular vga_setmode call and vga_setpage(0), with possibly a vga_setlinearaddressing call. Then a call to gl_setcontextvga(mode) is made. This makes the information about the mode available to gl_line.
The pixels are placed directly into video memory using inline coded commands.
svgalib(7), vgagl(7), svgalib.conf(5), threedkit(7), testgl(1), plane(1), wrapdemo(1), gl_circle(3), gl_clearscreen(3), gl_hline(3), gl_setpixel(3), gl_setpixelrgb(3), gl_setcontextvga(3).
This manual page was edited by Michael Weller <eowmob AT exp-math DOT uni-essen DOT de>. The exact source of the referenced demo as well as of the original documentation is unknown. This page was modified by Don Secrest <secrest AT uiuc DOT edu>.
It is very likely that both are at least to some extent are due to Harm Hanemaayer <H DOT Hanemaayer AT inter DOT nl DOT net>.
Occasionally this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections to this first version of the svgalib manual.