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Done.
For calculate lines used Bresenham's algorithm.


#include <math.h>
#include <X11/Xlib.h>
#include <X11/xpm.h>
#include <stdlib.h>

Hello. I need draw many lines with multicolor (color is set bysome pixmap (xpm))
on C++ with standart libs.

Horizontal lines are drawing succsessfully with GC and XSetTile.
But non-horizontal -...