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#!/usr/bin/env python3
# stdlib
import argparse
import sys
from dataclasses import dataclass
from math import ceil, floor, sqrt
from pathlib import Path
from typing import List
# external
from fpdf import FPDF
from PIL import Image
DEBUG = False
SCRIPT_DIR = Path(__file__).parent
PDF_PATH = SCRIPT_DIR / "cards.pdf"
# Constants for fpdf
LN_NEXT_LINE = 1
# Notes on layout:
# - All units are inches, unless the variable has an explicit unit suffix
# (such as foo_w_px).
# - Rectangle variables are named: foo_x, foo_y, foo_w, foo_h.
# - Bounding box variables are named: foo_bb_x, foo_bb_y, foo_bb_w, foo_bb_h.
# - Each bounding box contains the padding of its content (unless the code
# makes a mistake).
# Global padding for everything.
# TODO: Customize the padding for each page entity.
pad = 1/8
# Page size is US Letter.
page_w = 8.5
page_h = 11
@dataclass
class Card:
text: str
images: List[Path]
def main():
ap = argparse.ArgumentParser()
ap.add_argument("-d", "--debug", action="store_true")
args = ap.parse_args()
global DEBUG
DEBUG = args.debug
def cat_path(i):
return SCRIPT_DIR / "img" / f"cat{i:02d}.jpeg"
cards = [
Card("meow01", [cat_path(1)]),
Card("meow02", [cat_path(2)]),
Card("meow03", 3 * [cat_path(3)]), # 3 copies of same image
Card("meow04", 4 * [cat_path(4)]), # 4 copies of same image
Card("meow05", [cat_path(5)]),
Card("meow06", [cat_path(6)]),
]
make_pdf(cards)
make_depfile(cards)
def make_pdf(cards):
pdf = FPDF(orientation="portrait", unit="in", format="letter")
# The font family must be set before the pdf's first page begins.
pdf.set_font(family="courier", style="B", size=14)
for i, card in enumerate(cards):
if i % 2 == 0:
# page's top card
pdf.add_page()
pdf.set_margins(left=0, top=0)
pdf.set_y(0)
else:
# page's bottom card
pdf.dashed_line(x1 = 0, y1 = page_h / 2,
x2 = page_w, y2 = page_h / 2,
dash_length = 1/8, space_length = 1/8)
pdf.set_y(page_h / 2)
emit_card(pdf, cards, i)
pdf.close()
pdf.output(name=PDF_PATH, dest="F") # F => file
def emit_card(pdf, cards, card_index):
# TODO: Cleanup the padding details.
card_w = page_w
card_h = page_h / 2
card_x = 0
card_y = (card_index % 2) * page_h / 2
logd_rect(f"card[{card_index}]", card_x, card_y, card_w, card_h)
grid_w = card_w
grid_h = card_h - 1 # allow room for caption
grid_x = card_x
grid_y = card_y
logd_rect(f"grid[{card_index}]", grid_x, grid_y, grid_w, grid_h)
max_rows = 4
max_cols = 4
max_images = max_rows * max_cols
card = cards[card_index]
if len(card.images) == 0:
raise Exception("card has no images")
if len(card.images) > max_images:
raise Exception(f"card has more than {max_images} images")
# Render the images in a square layout. Each row contains the same number
# of images except possibly the last row, which may contain fewer.
s = sqrt(len(card.images))
rows = int(ceil(s))
cols_full = rows
logd(f"grid[{card_index}]: rows={rows}, cols_full={cols_full}")
for i in range(rows):
# Within a card, the extent of each row is invariant.
row_w = grid_w
row_h = grid_h / rows
row_x = grid_x
row_y = grid_y + i * row_h
logd_rect(f"row[{card_index},{i}]", row_x, row_y, row_w, row_h)
cols = cols_full
if i == rows - 1:
# last row
cols = len(card.images) - i * cols_full
assert 1 <= cols and cols <= cols_full
for j in range(cols):
logd(f"cell[{card_index},{i},{j}]")
col_w = row_w / cols
logd(f"col_w: {col_w}")
# Within a card, the extent of each image's bounding box is
# invariant. This ensures that all images receive similar scaling,
# even when the last row is not full.
image_bb_w = row_w / cols_full
image_bb_h = row_h
image_bb_x = (row_w - cols * image_bb_w) / 2 + j * image_bb_w
image_bb_y = row_y
image_bb_aspect = image_bb_w / image_bb_h
logd_rect(f"image_bb[{i},{j}]", image_bb_x, image_bb_y, image_bb_w, image_bb_h)
if DEBUG:
pdf.set_draw_color(255, 0, 0)
pdf.rect(image_bb_x, image_bb_y, image_bb_w - 0.02, image_bb_h - 0.02)
image_path = card.images[i * cols_full + j]
image = Image.open(image_path)
image_w_px, image_h_px = image.size
image_aspect = image_w_px / image_h_px
if image_aspect > image_bb_aspect:
image_w = image_bb_w - pad
image_h = image_w / image_aspect
else:
image_h = image_bb_h - pad
image_w = image_h * image_aspect
image_x = image_bb_x + (image_bb_w - image_w) / 2
image_y = image_bb_y + (image_bb_h - image_h) / 2
logd_rect(f"image[{card_index},{i},{j}]", image_x, image_y, image_w, image_h)
pdf.set_xy(image_x, image_y)
pdf.image(name = image_path,
w = image_w,
h = image_h,
type = image.format)
if DEBUG:
pdf.set_draw_color(0, 0, 255)
pdf.rect(image_x, image_y, image_w - 0.02, image_h - 0.02)
text_w = pdf.get_string_width(card.text)
text_x = (page_w - text_w) / 2
text_y = grid_y + grid_h + pad
if len(card.text.splitlines()) > 1:
raise Exception("caption must be a single line")
# Text must be single line.
if text_w > page_w - 2 * pad:
raise Exception("caption is too long")
pdf.set_xy(text_x, text_y)
pdf.cell(txt = card.text,
w = 0, h = 0,
ln=LN_NEXT_LINE)
# Write the dependency file used by the Makefile.
def make_depfile(cards):
with open(PDF_PATH.with_suffix(".d"), "w") as f:
dep_path = PDF_PATH.relative_to(SCRIPT_DIR).with_suffix(".d")
f.write(PDF_PATH.name)
f.write(":")
for c in cards:
for img_path in c.images:
f.write(" ")
f.write(str(img_path.relative_to(SCRIPT_DIR)))
f.write("\n")
def logd(msg):
if DEBUG:
print(f"debug: {msg}", file=sys.stderr)
def logd_rect(name, x, y, w, h):
logd(f"{name}: {x:0.2f} {y:0.2f} {w:0.2f} {h:0.2f}")
if __name__ == "__main__":
main()
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