Add folder.py - a book cover made with flex

folder.py

@@ -0,0 +1,35 @@
+#!/usr/bin/python
+
+from boxes import *
+import math
+
+class Folder(Boxes):
+
+    def __init__(self, x, y, h, r=0):
+        Boxes.__init__(self, width=2*x+3*h+20, height=y+20)
+        self.x = x
+        self.y = y
+        self.h = h
+        self.r = r
+
+    def render(self):
+        x, y, r, h = self.x, self.y, self.r, self.h
+        c2 = math.pi * h
+        self.moveTo(r+self.thickness, self.thickness)
+        self.edge(x-r)
+        self.flexEdge(c2, y)
+        self.edge(x-r)
+        self.corner(90, r)
+        self.edge(y-2*r)
+        self.corner(90, r)
+        self.edge(2*x-2*r+c2)
+        self.corner(90, r)
+        self.edge(y-2*r)
+        self.corner(90, r)
+        
+        self.ctx.stroke()
+        self.surface.flush()
+        self.surface.finish()
+
+f = Folder(240, 350, 20, 15)
+f.render()