X-Git-Url: https://git.ao2.it/experiments/RadialSymmetry.git/blobdiff_plain/d61a76f33cbf0f18f63e0b365e9d7f0ba6732323..3286ef9194ac827cfa6d93aac6036214631f69c9:/Diagram.py

diff --git a/Diagram.py b/Diagram.py
index ff5a500..7d6348b 100755
--- a/Diagram.py
+++ b/Diagram.py
@@ -23,7 +23,7 @@ from math import *
 
 class Diagram(object):
 
-    def __init__(self, width, height, background=[1, 1, 1]):
+    def __init__(self, width, height, background=[1, 1, 1], font_size=20):
         self.width = width
         self.height = height
         self.background = background
@@ -38,7 +38,7 @@ class Diagram(object):
 
         cr.select_font_face("Georgia", cairo.FONT_SLANT_NORMAL,
                             cairo.FONT_WEIGHT_NORMAL)
-        cr.set_font_size(20)
+        cr.set_font_size(font_size)
 
         # Adjust the font matrix to left-bottom origin
         M = cr.get_font_matrix()
@@ -161,30 +161,17 @@ 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)
-
-        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()
+        self.draw_rect(rx, ry, width, height, theta, fill, fill_color, stroke,
+                       stroke_color)
 
     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]):
@@ -295,4 +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()