gui: add support for drawLine with odb::Line

Signed-off-by: Peter Gadfort <peter.gadfort@gmail.com>

Author: gadfort

src/gui/include/gui/gui.h

@@ -216,6 +216,7 @@ class Painter
 
   // Draw a line with coordinates in DBU with the current pen
   virtual void drawLine(const odb::Point& p1, const odb::Point& p2) = 0;
+  void drawLine(const odb::Line& line) { drawLine(line.pt0(), line.pt1()); }
 
   // Draw a circle with coordinates in DBU with the current pen
   virtual void drawCircle(int x, int y, int r) = 0;