hexaflexagon_diagram: reuse get_triangle_center_in_plan()

Reuse get_triangle_center_in_plan() also in draw_plan_template() instead
of open coding the calculations.

diff --git a/src/flexagon/hexaflexagon_diagram.py b/src/flexagon/hexaflexagon_diagram.py
index b7e50fb..09e8fc9 100755 (executable)
--- a/src/flexagon/hexaflexagon_diagram.py
+++ b/src/flexagon/hexaflexagon_diagram.py
@@ -173,13 +173,11 @@ class HexaflexagonDiagram(object):
             self.backend.draw_centered_text(tx, ty, corner_text, text_theta, color)
 
     def draw_plan_template(self):
-        x0, y0 = self.plan_origin
         for hexagon in self.hexaflexagon.hexagons:
             for triangle in hexagon.triangles:
-                i, j = self.hexaflexagon.get_triangle_plan_position(triangle)
-                x, y = triangle.calc_plan_coordinates(self.triangle_radius, i, j)
+                x, y = self.get_triangle_center_in_plan(triangle)
                 theta = triangle.get_angle_in_plan()
-                self.draw_triangle_template(triangle, x0 + x, y0 + y, theta)
+                self.draw_triangle_template(triangle, x, y, theta)
 
     def draw_template(self):
         for hexagon in self.hexaflexagon.hexagons: