src/librarian/covers/widgets/title.py

   1 # This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
   2 # Copyright © Fundacja Wolne Lektury. See NOTICE for more information.
   3 #
   4 import PIL.ImageFont
   5 from librarian import get_resource
   6 from librarian.cover import Metric
   7 from ..utils.textbox import TextBox, split_words
   8 from .base import Widget
   9
  10
  11 class TitleBox(Widget):
  12     font_size = 159 # 45pt
  13     leading = 176  # 50pt
  14     tracking = 2.385
  15
  16     def __init__(self, cover, width, height, lines, scale=1):
  17         self.width = width
  18         self.height = height
  19         self.lines = lines
  20         self.m = Metric(self, cover.m._scale * scale)
  21         super().__init__(cover)
  22
  23     def setup(self):
  24         title_font = PIL.ImageFont.truetype(
  25             get_resource('fonts/SourceSans3VF-Roman.ttf'),
  26             self.m.font_size,
  27             layout_engine=PIL.ImageFont.Layout.BASIC
  28         )
  29         title_font.set_variation_by_axes([800])
  30
  31         lines = self.lines or (int(self.height * (176/200) / self.m.leading) - 0)
  32
  33         self.tb = TextBox(
  34             self.width,
  35             self.height,
  36             split_words(self.cover.title),
  37             title_font,
  38             lines,
  39             self.m.leading,
  40             self.m.tracking,
  41             .5, .5
  42         )
  43         self.margin_top = self.tb.margin_top
  44
  45     def build(self, w, h):
  46         return self.tb.as_pil_image(self.cover.color_scheme['text'])
  47