src/librarian/covers/widgets/title.py

   1 import PIL.ImageFont
   2 from librarian import get_resource
   3 from librarian.cover import Metric
   4 from ..utils.textbox import TextBox, split_words
   5 from .base import Widget
   6
   7
   8 class TitleBox(Widget):
   9     font_size = 159 # 45pt
  10     leading = 176  # 50pt
  11     tracking = 2.385
  12
  13     def __init__(self, cover, width, height, lines, force=False):
  14         self.width = width
  15         self.height = height
  16         self.lines = lines
  17         self.force = force
  18         self.m = Metric(self, cover.m._scale)
  19         super().__init__(cover)
  20
  21     def setup(self):
  22         m = self.m
  23         while True:
  24             try:
  25                 self.build_box()
  26             except:
  27                 if self.force:
  28                     self.m = Metric(self, self.m._scale * .99)
  29                     print('lower to', self.m.font_size)
  30                 else:
  31                     raise
  32             else:
  33                 break
  34
  35     def build_box(self):
  36         title_font = PIL.ImageFont.truetype(
  37             get_resource('fonts/SourceSans3VF-Roman.ttf'),
  38             self.m.font_size,
  39             layout_engine=PIL.ImageFont.LAYOUT_BASIC
  40         )
  41         title_font.set_variation_by_axes([800])
  42
  43         lines = self.lines or (int(self.height * (176/200) / self.m.leading) - 0)
  44
  45         self.tb = TextBox(
  46             self.width,
  47             self.height,
  48             split_words(self.cover.title),
  49             title_font,
  50             lines,
  51             self.m.leading,
  52             self.m.tracking,
  53             .5, .5
  54         )
  55         self.margin_top = self.tb.margin_top
  56
  57     def build(self, w, h):
  58         return self.tb.as_pil_image(self.cover.color_scheme['text'])
  59