Diagram.py: add some example calls to test drawing rectangles

[experiments/RadialSymmetry.git] / Diagram.py

diff --git a/Diagram.py b/Diagram.py
index 8d958f9..fa35d32 100755 (executable)
--- a/Diagram.py
+++ b/Diagram.py
@@ -161,37 +161,25 @@ class Diagram(object):
                               stroke=False, stroke_color=[0, 0, 0, 0.5]):
         cr = self.cr
 
+        # the position of the center of a rectangle at (0,0)
         mx = width / 2.0
         my = height / 2.0
 
+        # calculate the position of the bottom-left corner after rotating the
+        # rectangle around the center
         rx = cx - (mx * cos(theta) - my * sin(theta))
         ry = cy - (mx * sin(theta) + my * cos(theta))
 
-        cr.save()
-        cr.translate(rx, ry)
-        cr.rotate(theta)
+        self.draw_rect(rx, ry, width, height, theta, fill, fill_color, stroke,
+                       stroke_color)
 
-        if fill:
-            cr.rectangle(0, 0, width, height)
-            r, g, b, a = self.color_to_rgba(fill_color)
-            cr.set_source_rgba(r, g, b, a)
-            cr.fill()
-
-        if stroke:
-            cr.rectangle(0, 0, width, height)
-            r, g, b, a = self.color_to_rgba(stroke_color)
-            cr.set_source_rgba(r, g, b, a)
-            cr.stroke()
-            self.draw_dot(0, 0, 3.0, stroke_color)
-
-        cr.restore()
-
-    def draw_rect(self, x, y, width, height, fill=True, fill_color=[1, 1, 1, 0.8],
+    def draw_rect(self, x, y, width, height, theta=0, fill=True, fill_color=[1, 1, 1, 0.8],
                   stroke=False, stroke_color=[0, 0, 0, 0.5]):
         cr = self.cr
 
         cr.save()
         cr.translate(x, y)
+        cr.rotate(theta)
 
         if fill:
             cr.rectangle(0, 0, width, height)
@@ -244,7 +232,7 @@ class Diagram(object):
         cr.rotate(theta)
 
         if bb_fill or bb_stroke:
-            self.draw_rect(bb[0], bb[1], bb[2], bb[3], bb_fill, bb_fill_color, bb_stroke, bb_stroke_color)
+            self.draw_rect(bb[0], bb[1], bb[2], bb[3], 0, bb_fill, bb_fill_color, bb_stroke, bb_stroke_color)
 
         r, g, b, a = self.color_to_rgba(color)
         cr.set_source_rgba(r, g, b, a)
@@ -294,4 +282,10 @@ if __name__ == "__main__":
 
     diagram.draw_line(0, y, 400, y, [0, 0, 1, 0.2])
 
+    diagram.draw_rect(40, 40, 300, 100, stroke=True)
+    diagram.draw_rect(40, 40, 300, 100, pi / 30, stroke=True)
+
+    diagram.draw_rect(40, 250, 300, 100, stroke=True)
+    diagram.draw_rect_from_center(40 + 150, 250 + 50, 300, 100, theta=pi / 40, stroke=True, stroke_color=[1, 0, 0], fill=False)
+
     diagram.show()