--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data_generation/transformations/pycaptcha/Captcha/Visual/Backgrounds.py	Fri Feb 26 14:15:38 2010 -0500
@@ -0,0 +1,95 @@
+""" Captcha.Visual.Backgrounds
+
+Background layers for visual CAPTCHAs
+"""
+#
+# PyCAPTCHA Package
+# Copyright (C) 2004 Micah Dowty <micah@navi.cx>
+#
+
+from Captcha.Visual import Layer, Pictures
+import random, os
+import ImageDraw, Image
+
+
+class SolidColor(Layer):
+    """A solid color background. Very weak on its own, but good
+       to combine with other backgrounds.
+       """
+    def __init__(self, color="white"):
+        self.color = color
+
+    def render(self, image):
+        image.paste(self.color)
+
+
+class Grid(Layer):
+    """A grid of lines, with a given foreground color.
+       The size is given in pixels. The background is transparent,
+       so another layer (like SolidColor) should be put behind it.
+       """
+    def __init__(self, size=16, foreground="black"):
+        self.size = size
+        self.foreground = foreground
+        self.offset = (random.uniform(0, self.size),
+                       random.uniform(0, self.size))
+
+    def render(self, image):
+        draw = ImageDraw.Draw(image)
+
+        for i in xrange(image.size[0] / self.size + 1):
+            draw.line( (i*self.size+self.offset[0], 0,
+                        i*self.size+self.offset[0], image.size[1]), fill=self.foreground)
+
+        for i in xrange(image.size[0] / self.size + 1):
+            draw.line( (0, i*self.size+self.offset[1],
+                        image.size[0], i*self.size+self.offset[1]), fill=self.foreground)
+
+
+class TiledImage(Layer):
+    """Pick a random image and a random offset, and tile the rendered image with it"""
+    def __init__(self, imageFactory=Pictures.abstract):
+        self.tileName = imageFactory.pick()
+        self.offset = (random.uniform(0, 1),
+                       random.uniform(0, 1))
+
+    def render(self, image):
+        tile = Image.open(self.tileName)
+        for j in xrange(-1, int(image.size[1] / tile.size[1]) + 1):
+            for i in xrange(-1, int(image.size[0] / tile.size[0]) + 1):
+                dest = (int((self.offset[0] + i) * tile.size[0]),
+                        int((self.offset[1] + j) * tile.size[1]))
+                image.paste(tile, dest)
+
+
+class CroppedImage(Layer):
+    """Pick a random image, cropped randomly. Source images should be larger than the CAPTCHA."""
+    def __init__(self, imageFactory=Pictures.nature):
+        self.imageName = imageFactory.pick()
+        self.align = (random.uniform(0,1),
+                      random.uniform(0,1))
+
+    def render(self, image):
+        i = Image.open(self.imageName)
+        image.paste(i, (int(self.align[0] * (image.size[0] - i.size[0])),
+                        int(self.align[1] * (image.size[1] - i.size[1]))))
+
+
+class RandomDots(Layer):
+    """Draw random colored dots"""
+    def __init__(self, colors=("white", "black"), dotSize=4, numDots=400):
+        self.colors = colors
+        self.dotSize = dotSize
+        self.numDots = numDots
+	self.seed = random.random()
+
+    def render(self, image):
+        r = random.Random(self.seed)
+        for i in xrange(self.numDots):
+            bx = int(r.uniform(0, image.size[0]-self.dotSize))
+            by = int(r.uniform(0, image.size[1]-self.dotSize))
+            image.paste(r.choice(self.colors), (bx, by,
+                                                bx+self.dotSize-1,
+                                                by+self.dotSize-1))
+
+### The End ###