+void draw_rect_corners(drawing *dr, int cx, int cy, int r, int col)
+{
+ draw_line(dr, cx - r, cy - r, cx - r, cy - r/2, col);
+ draw_line(dr, cx - r, cy - r, cx - r/2, cy - r, col);
+ draw_line(dr, cx - r, cy + r, cx - r, cy + r/2, col);
+ draw_line(dr, cx - r, cy + r, cx - r/2, cy + r, col);
+ draw_line(dr, cx + r, cy - r, cx + r, cy - r/2, col);
+ draw_line(dr, cx + r, cy - r, cx + r/2, cy - r, col);
+ draw_line(dr, cx + r, cy + r, cx + r, cy + r/2, col);
+ draw_line(dr, cx + r, cy + r, cx + r/2, cy + r, col);
+}
+