Index: obj_pinvia_therm.h
===================================================================
--- obj_pinvia_therm.h	(revision 12419)
+++ obj_pinvia_therm.h	(revision 12420)
@@ -4,6 +4,9 @@
  *  PCB, interactive printed circuit board design
  *  Copyright (C) 1994,1995,1996,2006 Thomas Nau
  *
+ *  this file was written by and is
+ *  (C) Copyright 2006, harry eaton
+ *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
@@ -38,7 +41,45 @@
 
 #include <stdlib.h>
 #include "config.h"
+#include "polyarea.h"
+#include "polygon.h"
 
 pcb_polyarea_t *ThermPoly(pcb_board_t *, pcb_pin_t *, pcb_cardinal_t);
 
+static inline PCB_FUNC_UNUSED pcb_polyarea_t *pcb_pa_diag_line(pcb_coord_t X, pcb_coord_t Y, pcb_coord_t l, pcb_coord_t w, pcb_bool rt)
+{
+	pcb_pline_t *c;
+	pcb_vector_t v;
+	pcb_coord_t x1, x2, y1, y2;
+
+	if (rt) {
+		x1 = (l - w) * M_SQRT1_2;
+		x2 = (l + w) * M_SQRT1_2;
+		y1 = x1;
+		y2 = x2;
+	}
+	else {
+		x2 = -(l - w) * M_SQRT1_2;
+		x1 = -(l + w) * M_SQRT1_2;
+		y1 = -x1;
+		y2 = -x2;
+	}
+
+	v[0] = X + x1;
+	v[1] = Y + y2;
+	if ((c = pcb_poly_contour_new(v)) == NULL)
+		return NULL;
+	v[0] = X - x2;
+	v[1] = Y - y1;
+	pcb_poly_vertex_include(c->head.prev, pcb_poly_node_create(v));
+	v[0] = X - x1;
+	v[1] = Y - y2;
+	pcb_poly_vertex_include(c->head.prev, pcb_poly_node_create(v));
+	v[0] = X + x2;
+	v[1] = Y + y1;
+	pcb_poly_vertex_include(c->head.prev, pcb_poly_node_create(v));
+	return pcb_poly_from_contour(c);
+}
+
+
 #endif