12 KiB
Executable File
12 KiB
Executable File
huepaper
This is the literate programming file for huepaper.py.
To export it, open it in Emacs and tangle it.
Imports
Logo
The logo of huepaper is printed on startup.
def print_logo():
logo = """
.lk.
cO.
cO.;:lc. ,c. .cc .,',c; .,c.;coc. ;,.,c. ':l.:lo: '',:c. '::.lo.
cO' kd .O; dO ,x...,Ox cO; lO: ;x xk OO. .kO. x;...x0' 0x. .
cO. xx .O; dO ko...... :O. Ox .,..xO kk ;0;;0...... 0d
cO. xx .O; xO dO. .. :O. .O; dk xO kk :O.'0o , 0d
.dk, .kk. okc;,ox' ckxllc. :Oc'.,l' oOl;'dO:. kO;..:l. ,xOolc; ,Ox.
:O. kk
lO, OO
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO00O0000000000000000;
"""
print(logo)Base color
Every huepaper has a base color. It is used to calculate the final colors.
If a base color is given by the user, it can have every format, Colour supports. If no color is given, a random one is chosen.
def get_base_color(color_string=None):
# If no color string is given, create a random color
if not color_string:
hue = random.uniform(0, 1)
sat = random.uniform(sat_min, sat_max)
lum = random.uniform(lum_min, lum_max)
base_color = Color(hue=hue, saturation=sat, luminance=lum)
print("Selected random base color: {}".format(base_color.hex))
# Else try to parse string
else:
try:
base_color = Color(color_string)
except:
print("Not a valid color expression: {}".format(color_string))
sys.exit(1)
return base_colorColors
The final color limits for each edge of the huepaper are calculated with respect to the base color. They rely also on the given input parameters such as saturation and luminance. Those decide how much the colors differ from the base color.
def create_colors(base_color):
colors = []
max_sat_diff = 0.1
max_lum_diff = 0.1
# Create four random colors similar to the given base_color
for i in range(0, 4):
tmp_hue = base_color.hue + random.uniform(-max_hue / 2.0, max_hue / 2.0)
if tmp_hue > 1.0:
tmp_hue -= 1
tmp_sat = base_color.saturation + random.uniform(-max_sat_diff, max_sat_diff)
tmp_sat = min(sat_max, max(sat_min, tmp_sat))
tmp_lum = base_color.luminance + random.uniform(-max_lum_diff, max_lum_diff)
tmp_lum = min(lum_max, max(lum_min, tmp_lum))
color = Color(hue=tmp_hue, saturation=tmp_sat, luminance=tmp_lum)
colors.append(color.rgb)
return tuple(colors)Base image
The base image is a rectangle with the given height and width. The colors of the edges are the four calculated colors. All other pixel colors are linear interpolated.
# c1 - top left
# c2 - top right
# c3 - bottom right
# c4 - bottom left
def create_base_image(c1, c2, c3, c4):
# Lambda for adding four colors
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],
)
# Lambda for multiplying a color with a factor
mul = lambda c, x: (c[0] * x, c[1] * x, c[2] * x)
# Lambda for scaling a color from [0 , 1] to [0, 255]
cor = lambda c: (int(c[0] * 255), int(c[1] * 255), int(c[2] * 255))
# Lambda for calculating a color at x and y in range [0, 1]
# Color limits are set at creation
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),
)
)
# Create image
image = Image.new("RGBA", (width, height))
pixels = image.load()
for x in range(0, width):
for y in range(0, height):
pixels[x, y] = col(x / (width - 1), y / (height - 1))
return imageLines
Vertical lines can be added on the side of the huepaper.
def add_lines(image, color):
line_image = Image.new("RGBA", (width, height), (0, 0, 0, 0))
draw = ImageDraw.Draw(line_image)
# Set color
color = tuple(map(lambda x: int(x * 255), color))
# Generate lines
number_of_lines = random.randint(1, 3)
scale = width / 100.0
base_width = random.randint(int(2 * scale), int(5 * scale))
rand_width = lambda base_width=base_width: base_width + random.randint(
-base_width // 2, base_width // 2
)
space = rand_width() // 2
offset = random.randint(0, space)
for i in range(0, number_of_lines):
line_width = rand_width()
x = offset + space + (line_width // 2)
draw.line((x, 0, x, height), fill=color, width=line_width)
offset += space + line_width
# Mirror line image eventually
orientation = random.randrange(2)
if orientation == 1:
line_image = ImageOps.mirror(line_image)
# Add line image to input image
image.alpha_composite(line_image, (0, 0))
return imagePixelation
The huepaper can be pixelated. This is realized by scaling.
def add_pixelation(image, x, y):
image = image.resize((x, y))
image = image.resize((width, height), Image.BOX)
return imageEmblem
A huepaper can have an emblem. This is loaded from a file and placed in the center.
def add_emblem(image, filepath):
# Load image
try:
emblem_image = Image.open(filepath)
except Exception as e:
print("Failed to load emblem: {}".format(e))
sys.exit(1)
# Exit if emblem is too big
if emblem_image.size[0] > width or emblem_image.size[1] > height:
print("Emblem can't be bigger than the wallpaper")
sys.exit(1)
# Insert emblem in the center
offset = (
(image.size[0] - emblem_image.size[0]) // 2,
(image.size[1] - emblem_image.size[1]) // 2,
)
image.alpha_composite(emblem_image, offset)
return imageSave
huepapers can be saved to a filepath. Already existing files are only overwritten if the user wants to.
def save_image(filepath, image):
save = True
# Check whether file exists
if os.path.isfile(filepath):
overwrite = input(
"The file {} already exists. Do you want to overwrite it? [y/N] ".format(
filepath
)
)
if overwrite != "y" and overwrite != "Y":
save = False
if save:
stop = False
while not stop:
try:
image.save(filepath)
stop = True
except Exception as e:
print("Failed to save wallpaper: {}".format(e))
again = input("Do you want to try again? [Y/n] ")
if again == "n" or again == "N":
stop = True
else:
filepath = input(
"Please enter new path where the wallpaper shall be saved: "
)Main
In the main routine, the arguments are parsed and the image is created.
def main():
global width, height, max_hue, sat_min, sat_max, lum_min, lum_max
parser = argparse.ArgumentParser(
description="Create wallpapers based on color hues."
)
parser.add_argument(
"-s",
"--size",
default="1920x1080",
help="size of huepaper in the form WIDTHxHEIGHT (default: 1920x1080)",
)
parser.add_argument(
"-c",
"--color",
help="color, the huepaper is generated from (uses a random color if not given)",
)
parser.add_argument("-p", "--preview", action="store_true", help="preview huepaper")
parser.add_argument(
"-o", "--output", help="file where to save the huepaper to (default: None)"
)
parser.add_argument(
"-l",
"--lines",
nargs="?",
const=0.3,
type=float,
help="include one to three random lines in base color with given opacity in range [0, 1] (default: 0.3)",
)
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)",
)
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)",
)
parser.add_argument(
"-P",
"--pixelate",
nargs="?",
const="16x9",
help="pixelate image with WIDTHxHEIGHT (default: 16x9)",
)
parser.add_argument(
"-e", "--emblem", help="emblem to add in the center of the huepaper"
)
parser.add_argument(
"-hue",
default=0.1,
type=float,
help="maximum hue to differ from given color in range [0, 1] (default: 0.1)",
)
parser.add_argument(
"-smin",
default=0.2,
type=float,
help="minimum satisfaction for colors in range [0, 1] (default: 0.2)",
)
parser.add_argument(
"-smax",
default=1.0,
type=float,
help="maximum satisfaction for colors in range [0, 1] (default: 1.0)",
)
parser.add_argument(
"-lmin",
default=0.2,
type=float,
help="minimum luminance for colors in range [0, 1] (default: 0.2)",
)
parser.add_argument(
"-lmax",
default=0.9,
type=float,
help="maximum luminance for colors in range [0, 1] (default: 0.9)",
)
# Get args
args = parser.parse_args()
size = args.size
color = args.color
preview = args.preview
output = args.output
lines = args.lines
lines_bright = args.lines_bright
lines_dark = args.lines_dark
emblem = args.emblem
pixelate = args.pixelate
max_hue = args.hue
sat_min = args.smin
sat_max = args.smax
lum_min = args.lmin
lum_max = args.lmax
# Get size
try:
values = size.split("x")
width = int(values[0])
height = int(values[1])
except:
parser.error("The size must be given in form: 1920x1080")
# Check preconditions
if not preview and not output:
parser.error("You must either set -p (--preview) or -o (--output)")
if pixelate:
try:
values = pixelate.split("x")
px = int(values[0])
py = int(values[1])
except:
parser.error("Pixelation value must be set in form: 42x42")
print_logo()
base_color = get_base_color(color)
c1, c2, c3, c4 = create_colors(base_color)
image = create_base_image(c1, c2, c3, c4)
if lines:
image = add_lines(image, base_color.rgb + (lines,))
if lines_bright:
image = add_lines(image, (1.0, 1.0, 1.0, lines_bright))
if lines_dark:
image = add_lines(image, (0.0, 0.0, 0.0, lines_dark))
if pixelate:
image = add_pixelation(image, px, py)
if emblem:
image = add_emblem(image, emblem)
image.mode = "RGB"
if preview:
image.show()
if not output:
save = input("Do you want to save the image? [y/N] ")
if save == "y" or save == "Y":
path = input("Enter the path where the wallpaper shall be saved: ")
save_image(path, image)
if output:
save_image(output, image)
if __name__ == "__main__":
main()