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""" 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 ###
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