Index: draw_wireframe.h
===================================================================
--- draw_wireframe.h	(revision 11821)
+++ draw_wireframe.h	(revision 11822)
@@ -53,15 +53,13 @@
  */
 static inline PCB_FUNC_UNUSED void pcb_draw_wireframe_line(pcb_hid_gc_t gc, pcb_coord_t x1, pcb_coord_t y1, pcb_coord_t x2, pcb_coord_t y2, pcb_coord_t thick)
 {
-	pcb_coord_t dx, dy, ox, oy;
-
-	dx = x2 - x1;
-	dy = y2 - y1;
-	if ((dx != 0) || (dy != 0)) {
+	if((x1 != x2) || (y1 != y2)) {
+		double dx = x2 - x1;
+		double dy = y2 - y1;
 		double h = 0.5 * thick / sqrt(PCB_SQUARE(dx) + PCB_SQUARE(dy));
+		pcb_coord_t ox = dy * h + 0.5 * SGN(dy);
+		pcb_coord_t oy = -(dx * h + 0.5 * SGN(dx));
 
-		ox = dy * h + 0.5 * SGN(dy);
-		oy = -(dx * h + 0.5 * SGN(dx));
 		if (coord_abs(ox) >= pcb_pixel_slop || coord_abs(oy) >= pcb_pixel_slop) {
 			pcb_angle_t angle = atan2(dx, dy) * 57.295779;
 			pcb_gui->draw_line(gc, x1 + ox, y1 + oy, x2 + ox, y2 + oy);