do_line
Calculates all the points along a line.
Description
void do_line(BITMAP *bmp,
int x1, y1, x2, y2,
int d,
void (*proc
)(BITMAP *bmp,
int x,
int y,
int d
));
Calculates all the points along a line from point (x1, y1) to (x2, y2),
calling the supplied function for each one. This will be passed a copy of
the bmp parameter, the x and y position, and a copy of the d parameter,
so it is suitable for use with putpixel(). Example:
void draw_dust_particle(BITMAP *bmp, int x, int y, int d)
{
...
}
do_line(screen, 0, 0, SCREEN_W-1, SCREEN_H-2,
dust_strength, draw_dust_particle);
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