ggiDrawLine - Draw a line on a visual
#include <ggi/ggi.h>
int ggiDrawLine(ggi_visual_t vis, int x, int y, int xe, int ye);
Draws any line, using the current foreground color set by
ggiSetGCForeground(3), from (x, y) to (xe, ye). The line is exact; the
pixel set is no more than 0.5 pixels off the place it should be.
This function returns 0 to indicate success.
ggiDrawHLine(3), ggiDrawVLine(3)