from math import sin, cos, pi

from PIL import Image

import pcf

class Hough:
    def __init__(self, size):
        self.size = size
        self.dt = pi / size[1]
        self.initial_angle = (pi / 4) + (self.dt / 2)

    def transform(self, image):
        image_s = pcf.hough(image.size, image.tostring(), self.initial_angle, self.dt)
        image = Image.fromstring('L', image.size, image_s)
        return image

    def lines_from_list(self, p_list):
        lines = []
        for p in p_list:
            lines.append(self.angle_distance(p))
        return lines

    def all_lines_h(self, image):
        im_l = image.load()
        lines1 = []
        for x in xrange(image.size[0] / 2):
            for y in xrange(image.size[1]):
                if im_l[x, y]:
                    lines1.append(self.angle_distance((x, y)))
        lines2 = []
        for x in xrange(image.size[0] / 2, image.size[0]):
            for y in xrange(image.size[1]):
                if im_l[x, y]:
                    lines2.append(self.angle_distance((x, y)))
        return [lines1, lines2]

    def all_lines(self, image):
        im_l = image.load()
        lines = []
        for x in xrange(image.size[0]):
            for y in xrange(image.size[1]):
                if im_l[x, y]:
                    lines.append(self.angle_distance((x, y)))
        return lines
    
    def angle_distance(self, point):
        return (self.dt * point[1] + self.initial_angle, point[0] - self.size[0] / 2)