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272 | """A chart of colours, and a drawing that names places in it.
The Python twin of the `write_color_table` example in Rust. A colour in such a
space is one number, and that number is not a colour: it is a row of the table
the document carries. The same sixteen numbers are drawn twice below, through
two tables, and what changes is the table.
The page is held in `Words`, once per language, and `HQF_PDF_LANG` picks which set is
drawn. The two tables are not language: eight rows of red, green and blue are the same
eight rows whoever reads the page.
Usage: python examples/write_color_table.py [out.pdf] [font.ttf]
HQF_PDF_LANG=fr python examples/write_color_table.py
"""
from __future__ import annotations
from dataclasses import dataclass
from pathlib import Path
import _language
import _licence
import _out
import hqf_pdf
# The left edge of everything.
LEFT = 70.0
# The house colours, eight entries of red, green and blue.
HOUSE = bytes(
[
0x1B, 0x36, 0x5D, # deep blue
0x2E, 0x86, 0x86, # teal
0xE8, 0xB3, 0x3B, # gold
0xD9, 0x5F, 0x43, # coral
0x7A, 0x4B, 0x7E, # plum
0xE3, 0xD5, 0xB8, # sand
0x5C, 0x67, 0x70, # slate
0x18, 0x1C, 0x22, # ink
]
)
# The same eight places, filled in for a different season.
SEASON = bytes(
[
0x0B, 0x4F, 0x3A, # pine
0x8C, 0xC0, 0x63, # moss
0xF2, 0xE8, 0xC9, # linen
0xB0, 0x2E, 0x4A, # berry
0x3D, 0x2B, 0x1F, # bark
0xE7, 0xA3, 0x6B, # clay
0x9A, 0xA5, 0x9E, # lichen
0x14, 0x18, 0x14, # peat
]
)
# The drawing itself: sixteen places in whichever table is being read, laid out four to
# a row from the top down.
PLACES = [
0.0, 1.0, 2.0, 3.0,
1.0, 4.0, 5.0, 2.0,
2.0, 5.0, 6.0, 1.0,
3.0, 2.0, 1.0, 7.0,
]
# How many places are drawn across.
ACROSS = 4
# The size of one swatch of a chart, the gap to the next, and the height.
CHART_CELL = 50.0
CHART_GAP = 6.0
CHART_HEIGHT = 34.0
# The size of one square of the drawing, and the gap to the next.
SQUARE = 44.0
SQUARE_GAP = 5.0
@dataclass(frozen=True)
class Words:
"""Every word the page draws, in one language.
The two tables are not here: eight rows of red, green and blue are the same eight
rows in every language, and so are the numbers under the swatches.
"""
# The line at the head of the page.
title: str
# The two lines under it, saying what the drawings below are.
intro: tuple[str, str]
# The first panel's heading and the line under it.
house: tuple[str, str]
# The second panel's, once the table has been swapped.
season: tuple[str, str]
# The two lines at the foot of the page.
closing: tuple[str, str]
# The page in English.
ENGLISH = Words(
title="A chart of colours, and a drawing that names places in it",
intro=(
"The two drawings below are the same sixteen numbers. Neither of them "
"says a colour: each says",
"which row of the table to look in, and the document carries the table.",
),
house=(
"The house colours",
"Eight rows of red, green and blue, carried in the file and named 0 to 7.",
),
season=(
"The same drawing, one table later",
"The same eight places, filled in for another season. The drawing was "
"not touched.",
),
closing=(
"Repainting the house is one table, not one drawing: nothing above was "
"drawn twice, and nothing",
"in either drawing had to be found and changed.",
),
)
# The page in French.
FRENCH = Words(
title="Une table de couleurs, et un dessin qui nomme ses lignes",
intro=(
"Les deux dessins ci-dessous sont les mêmes seize nombres. Aucun ne dit "
"une couleur : chacun dit",
"quelle ligne de la table regarder, et c'est le document qui porte la table.",
),
house=(
"Les couleurs de la maison",
"Huit lignes de rouge, de vert et de bleu, portées par le fichier et "
"nommées 0 à 7.",
),
season=(
"Le même dessin, une table plus tard",
"Les mêmes huit lignes, remplies pour une autre saison. Le dessin n'a "
"pas été touché.",
),
closing=(
"Repeindre la maison, c'est changer une table, pas un dessin : rien n'a "
"été dessiné deux fois,",
"et rien n'a eu à être retrouvé ni modifié dans l'un ou l'autre dessin.",
),
)
# Every language the example is written in. A language is added by writing its own set
# of words and naming it here.
WORDS = {_language.ENGLISH: ENGLISH, _language.FRENCH: FRENCH}
def heading(content, font, words):
"""Draw the title and the two lines saying what the page is showing."""
content.draw_text(font, 15.0, LEFT, 780.0, words.title)
content.save_state()
content.set_fill(hqf_pdf.Color.gray(0.35))
content.draw_text(font, 10.0, LEFT, 762.0, words.intro[0])
content.draw_text(font, 10.0, LEFT, 748.0, words.intro[1])
content.restore_state()
def panel_heading(content, font, y, title, under):
"""Draw one panel's heading, with the line under it."""
content.save_state()
content.set_fill(hqf_pdf.Color.gray(0.2))
content.draw_text(font, 11.0, LEFT, y, title)
content.set_fill(hqf_pdf.Color.gray(0.45))
content.draw_text(font, 8.0, LEFT, y - 15.0, under)
content.restore_state()
def chart(content, font, space, entries, bottom):
"""Draw the table itself, one swatch per row, under the number naming it."""
x = LEFT
place = 0.0
for _ in range(entries):
content.save_state()
content.set_fill_space(space)
content.set_fill_components([place])
content.rect(x, bottom, CHART_CELL, CHART_HEIGHT)
content.fill()
content.restore_state()
content.save_state()
content.set_fill(hqf_pdf.Color.gray(0.45))
content.draw_text(font, 8.0, x, bottom - 12.0, f"{place:.0f}")
content.restore_state()
x += CHART_CELL + CHART_GAP
place += 1.0
def drawing(content, space, top):
"""Draw the sixteen places, four to a row from the top down."""
x = LEFT
y = top - SQUARE
for count, place in enumerate(PLACES):
content.save_state()
content.set_fill_space(space)
content.set_fill_components([place])
content.rect(x, y, SQUARE, SQUARE)
content.fill()
content.restore_state()
if (count + 1) % ACROSS == 0:
x = LEFT
y -= SQUARE + SQUARE_GAP
else:
x += SQUARE + SQUARE_GAP
def closing(content, font, words):
"""Draw the closing note."""
content.save_state()
content.set_fill(hqf_pdf.Color.gray(0.35))
content.draw_text(font, 9.0, LEFT, 80.0, words.closing[0])
content.draw_text(font, 9.0, LEFT, 66.0, words.closing[1])
content.restore_state()
def table(entries):
"""The table `entries` hold, read through the profile the library builds."""
profile = hqf_pdf.IccBased(hqf_pdf.srgb_icc_profile(), hqf_pdf.DeviceSpace.Rgb)
return hqf_pdf.Indexed(profile, entries)
def main() -> None:
language = _language.from_environment()
words = _language.words_of(WORDS, language)
# A named file is written as named; the default one carries the language, so the two
# languages do not overwrite each other in `tmp/`.
out = _out.output_path(Path(_language.file_name("table.pdf", language)).stem)
document = hqf_pdf.Document()
document.set_license(_licence.licensed())
font = document.add_font(hqf_pdf.Font.from_path(_out.font_path()))
house = table(HOUSE)
season = table(SEASON)
entries = house.entries
house = document.add_color_space(house)
season = document.add_color_space(season)
content = hqf_pdf.Content()
heading(content, font, words)
panel_heading(content, font, 700.0, words.house[0], words.house[1])
chart(content, font, house, entries, 640.0)
drawing(content, house, 612.0)
panel_heading(content, font, 380.0, words.season[0], words.season[1])
chart(content, font, season, entries, 320.0)
drawing(content, season, 292.0)
closing(content, font, words)
page = hqf_pdf.Page.a4()
page.set_content(content)
document.add_page(page)
written = document.write(out)
print(
f"wrote {out}: {written} bytes, {len(PLACES)} places drawn twice "
f"through two tables of {entries} rows"
)
if __name__ == "__main__":
main()
|