First literate programming version
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Denis Lehmann
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298
huepaper.org
Executable file
298
huepaper.org
Executable file
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* huepaper
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:PROPERTIES:
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:header-args: :tangle huepaper_tangled.py :shebang "#!/usr/bin/env python"
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:END:
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This is the literate programming file for =huepaper.py=.
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To export it, open it in *Emacs* and *tangle* it.
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** Imports
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huepaper is mainly based on two libraries.
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[[https://github.com/vaab/colour][Colour]] and [[https://python-pillow.org/][Pillow]].
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#+BEGIN_SRC python
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import argparse
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import os.path
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import random
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import sys
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from colour import Color
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from PIL import Image, ImageDraw, ImageOps
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#+END_SRC
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** Base color
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Every huepaper has a base color.
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It is used to calculate the final colors.
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If a base color is given by the user, it can have every form, Colour supports.
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If no color is given, a random one is chosen.
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#+BEGIN_SRC python
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def get_base_color(color_string = None):
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# If no color string is given, create a random color
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if not color_string:
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hue = random.uniform(0, 1)
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sat = random.uniform(sat_min, sat_max)
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lum = random.uniform(lum_min, lum_max)
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base_color = Color(hue = hue, saturation = sat, luminance = lum)
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print('Selected random base color: {}'.format(base_color.hex))
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# Else try to parse string
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else:
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try:
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base_color = Color(color_string)
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except:
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print('Not a valid color expression: {}'.format(color_string))
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sys.exit(1)
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return base_color
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#+END_SRC
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** Colors
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The final color limits for each edge of the huepaper are calculated with respect to the base color.
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They rely also on the given input parameters such as saturation and luminance..
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Those decide how much the colors differ from the base color.
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#+BEGIN_SRC python
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def create_colors(base_color):
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colors = []
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max_sat_diff = 0.1
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max_lum_diff = 0.1
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# Create four random colors similar to the given base_color
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for i in range(0, 4):
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tmp_hue = base_color.hue + random.uniform(-max_hue / 2.0, max_hue / 2.0)
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if tmp_hue > 1.0:
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tmp_hue -= 1
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tmp_sat = base_color.saturation + random.uniform(-max_sat_diff, max_sat_diff)
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tmp_sat = min(sat_max, max(sat_min, tmp_sat))
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tmp_lum = base_color.luminance + random.uniform(-max_lum_diff, max_lum_diff)
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tmp_lum = min(lum_max, max(lum_min, tmp_lum))
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color = Color(hue = tmp_hue, saturation = tmp_sat, luminance = tmp_lum)
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colors.append(color.rgb)
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return tuple(colors)
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#+END_SRC
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** Rest
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#+BEGIN_SRC python
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# Create base image from four colors, width and height
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# c1 - top left
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# c2 - top right
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# c3 - bottom right
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# c4 - bottom left
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def create_base_image(c1, c2, c3, c4):
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# Lambda for adding four colors
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add = lambda c1, c2, c3, c4 : (c1[0] + c2[0] + c3[0] + c4[0], c1[1] + c2[1] + c3[1] + c4[1], c1[2] + c2[2] + c3[2] + c4[2])
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# Lambda for multiplying a color with a factor
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mul = lambda c, x : (c[0] * x, c[1] * x, c[2] * x)
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# Lambda for scaling a color from [0 , 1] to [0, 255]
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cor = lambda c : (int(c[0] * 255), int(c[1] * 255), int(c[2] * 255))
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# Lambda for calculating a color at x and y in range [0, 1]
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# Color limits are set at creation
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col = lambda x, y, c1 = c1, c2 = c2, c3 = c3, c4 = c4 : cor(add(mul(c1, (1.0 - x) * (1.0 - y)), mul(c2, x * (1.0 - y)), mul(c3, x * y), mul(c4, (1.0 - x) * y)))
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# Create image
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image = Image.new('RGBA', (width, height))
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pixels = image.load()
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for x in range(0, width):
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for y in range(0, height):
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pixels[x, y] = col(x / (width - 1), y / (height - 1))
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return image
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# Add lines to an image
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def add_lines(image, color):
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line_image = Image.new('RGBA', (width, height), (0, 0, 0, 0))
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draw = ImageDraw.Draw(line_image)
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# Set color
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color = tuple(map(lambda x : int(x * 255), color))
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# Generate lines
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number_of_lines = random.randint(1, 3)
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scale = width / 100.0
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base_width = random.randint(int(2 * scale), int(5 * scale))
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rand_width = lambda base_width = base_width : base_width + random.randint(-base_width // 2, base_width // 2)
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space = rand_width() // 2
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offset = random.randint(0, space)
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for i in range(0, number_of_lines):
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line_width = rand_width()
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x = offset + space + (line_width // 2)
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draw.line((x, 0, x, height), fill = color, width = line_width)
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offset += space + line_width
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# Mirror line image eventually
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orientation = random.randrange(2)
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if orientation == 1:
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line_image = ImageOps.mirror(line_image)
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# Add line image to input image
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image.alpha_composite(line_image, (0, 0))
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return image
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# Add pixelation to image
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def add_pixelation(image, x, y):
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image = image.resize((x, y))
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image = image.resize((width, height), Image.BOX)
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return image
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# Add emblem to an image from a filepath
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def add_emblem(image, filepath):
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# Load image
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try:
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emblem_image = Image.open(filepath)
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except Exception as e:
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print('Failed to load emblem: {}'.format(e))
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sys.exit(1)
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# Exit if emblem is too big
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if emblem_image.size[0] > width or emblem_image.size[1] > height:
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print('Emblem can\'t be bigger than the wallpaper')
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sys.exit(1)
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# Insert emblem in the center
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offset = ((image.size[0] - emblem_image.size[0]) // 2, (image.size[1] - emblem_image.size[1]) // 2)
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image.alpha_composite(emblem_image, offset)
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return image
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# Save image to filepath
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def save_image(filepath, image):
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save = True
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# Check whether file exists
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if os.path.isfile(filepath):
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overwrite = input('The file {} already exists. Do you want to overwrite it? [y/N] '.format(filepath))
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if overwrite != 'y' and overwrite != 'Y':
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save = False
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if save:
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stop = False
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while not stop:
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try:
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image.save(filepath)
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stop = True
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except Exception as e:
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print('Failed to save wallpaper: {}'.format(e))
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again = input('Do you want to try again? [Y/n] ')
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if again == 'n' or again == 'N':
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stop = True
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else:
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filepath = input('Please enter new path where the wallpaper shall be saved: ')
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'''
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Main
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'''
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def main():
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global width, height, max_hue, sat_min, sat_max, lum_min, lum_max
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# Initialize parser
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parser = argparse.ArgumentParser(description = 'Create wallpapers based on color hues.')
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parser.add_argument('-W', '--width', default = 1920, type = int, help = 'width of wallpaper (defaul: 1920)')
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parser.add_argument('-H', '--height', default = 1080, type = int, help = 'height of wallpaper (default: 1080)')
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parser.add_argument('-c', '--color', help = 'color, the wallpaper is generated from (uses a random color if not given)')
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parser.add_argument('-p', '--preview', action = 'store_true', help = 'preview wallpaper')
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parser.add_argument('-o', '--output', help = 'file where to save the wallpaper to (default: None)')
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parser.add_argument('-l', '--lines', nargs = '?', const = 0.1, type = float, help = 'include one to three random lines in base color with given opacity in range [0, 1] (default: 0.1)')
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parser.add_argument('-lb', '--lines_bright', nargs = '?', const = 0.1, type = float, help = 'include one to three bright random lines with given opacity in range [0, 1] (default: 0.1)')
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parser.add_argument('-ld', '--lines_dark', nargs = '?', const = 0.1, type = float, help = 'include one to three dark random lines with given opacity in range [0, 1] (default: 0.1)')
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parser.add_argument('-P', '--pixelate', help = "pixelate image (e.g. 42x42)")
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parser.add_argument('-e', '--emblem', help = 'emblem to add in the center of the wallpaper')
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parser.add_argument('-hue', default = 0.1, type = float, help = 'maximum hue to differ from given color in range [0, 1] (default: 0.1)')
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parser.add_argument('-smin', default = 0.2, type = float, help = 'minimum satisfaction for colors in range [0, 1] (default: 0.2)')
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parser.add_argument('-smax', default = 1.0, type = float, help = 'maximum satisfaction for colors in range [0, 1] (default: 1.0)')
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parser.add_argument('-lmin', default = 0.2, type = float, help = 'minimum luminance for colors in range [0, 1] (default: 0.2)')
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parser.add_argument('-lmax', default = 0.9, type = float, help = 'maximum luminance for colors in range [0, 1] (default: 0.9)')
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# Get args
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args = parser.parse_args()
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width = args.width
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height = args.height
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color = args.color
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preview = args.preview
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output = args.output
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lines = args.lines
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lines_bright = args.lines_bright
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lines_dark = args.lines_dark
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emblem = args.emblem
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pixelate = args.pixelate
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max_hue = args.hue
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sat_min = args.smin
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sat_max = args.smax
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lum_min = args.lmin
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lum_max = args.lmax
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# Check preconditions
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if not preview and not output:
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parser.error('You must either set -p (--preview) or -o (--output)')
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if pixelate:
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try:
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values = pixelate.split('x')
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px = int(values[0])
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py = int(values[1])
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except:
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parser.error('Pixelation value must be set in form: 42x42')
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# Main routine
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base_color = get_base_color(color)
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c1, c2, c3, c4 = create_colors(base_color)
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image = create_base_image(c1, c2, c3, c4)
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if lines:
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image = add_lines(image, base_color.rgb + (lines,))
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if lines_bright:
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image = add_lines(image, (1.0, 1.0, 1.0, lines_bright))
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if lines_dark:
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image = add_lines(image, (0.0, 0.0, 0.0, lines_dark))
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if pixelate:
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image = add_pixelation(image, px, py)
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if emblem:
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image = add_emblem(image, emblem)
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if preview:
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image.show()
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if not output:
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save = input('Do you want to save the image? [y/N] ')
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if save == 'y' or save == 'Y':
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path = input('Enter the path where the wallpaper shall be saved: ')
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save_image(path, image)
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if output:
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save_image(output, image)
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if __name__ == '__main__':
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main()
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#+END_SRC
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