Index: src/obj_gfx.c
===================================================================
--- src/obj_gfx.c	(revision 38584)
+++ src/obj_gfx.c	(revision 38585)
@@ -799,7 +799,7 @@
 
 	len = rnd_get_value(lens, NULL, NULL, &succ);
 	if (succ)
-		gfx_set_resize_by_pixel_dist(gfx, px2-px1, py2-py1, len, allow_x, allow_y, 1);
+		gfx_set_resize_by_pixel_dist(gfx, RND_ABS(px2-px1), RND_ABS(py2-py1), len, allow_x, allow_y, 1);
 	free(lens);
 }