librarian/cover.py

   1 # -*- coding: utf-8 -*-
   2 #
   3 # This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
   4 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   5 #
   6 import Image, ImageFont, ImageDraw, ImageFilter
   7 from librarian import get_resource
   8
   9
  10 def cover(author, title,
  11           width, height, background_color, background_img,
  12           author_top, author_margin_left, author_margin_right, author_lineskip, author_color, author_font, author_shadow,
  13           title_top, title_margin_left, title_margin_right, title_lineskip, title_color, title_font, title_shadow,
  14           logo_width, logo_bottom
  15           ):
  16     def draw_centered_text(text, img, font, margin_left, width, pos_y, lineskip, color, shadow_color):
  17         if shadow_color:
  18             shadow_img = Image.new('RGBA', img.size)
  19             shadow_draw = ImageDraw.Draw(shadow_img)
  20         text_img = Image.new('RGBA', img.size)
  21         text_draw = ImageDraw.Draw(text_img)
  22         while text:
  23             line = text
  24             while text_draw.textsize(line, font=font)[0] > width:
  25                 try:
  26                     line, ext = line.rsplit(' ', 1)
  27                 except:
  28                     break
  29             pos_x = margin_left + (width - text_draw.textsize(line, font=font)[0]) / 2
  30             if shadow_color:
  31                 shadow_draw.text((pos_x + 3, pos_y + 3), line, font=font, fill=shadow_color)
  32             text_draw.text((pos_x, pos_y), line, font=font, fill=color)
  33             pos_y += lineskip
  34             text = text[len(line)+1:]
  35         if shadow_color:
  36             shadow_img = shadow_img.filter(ImageFilter.BLUR)
  37             img.paste(shadow_img, None, shadow_img)
  38         img.paste(text_img, None, text_img)
  39         return pos_y
  40
  41
  42     img = Image.new('RGB', (width, height), background_color)
  43
  44     if background_img:
  45         background = Image.open(background_img)
  46         img.paste(background)
  47         del background
  48
  49     # WL logo
  50     if logo_width:
  51         logo = Image.open(get_resource('res/wl-logo.png'))
  52         logo = logo.resize((logo_width, logo.size[1] * logo_width / logo.size[0]))
  53         img.paste(logo, ((width - logo_width) / 2, img.size[1] - logo.size[1] - logo_bottom))
  54
  55     title_y = draw_centered_text(author, img, author_font,
  56                     author_margin_left, width - author_margin_left - author_margin_right, author_top,
  57                     author_lineskip, author_color, author_shadow) + title_top
  58     draw_centered_text(title, img, title_font,
  59                     title_margin_left, width - title_margin_left - title_margin_right, title_y,
  60                     title_lineskip, title_color, title_shadow)
  61
  62     return img
  63
  64
  65 def virtualo_cover(author, title):
  66     return cover(author, title,
  67           600, 730, '#fff', None,
  68           73, 20, 20, 40, '#000', ImageFont.truetype(get_resource('fonts/DejaVuSerif.ttf'), 30), None,
  69           73, 20, 20, 54, '#000', ImageFont.truetype(get_resource('fonts/DejaVuSerif.ttf'), 40), None,
  70           300, 0
  71           )
  72
  73 def asbis_cover(author, title):
  74     return cover(author, u"„%s”" % title,
  75           800, 800, '#000', '',
  76           455, 230, 170, 60, '#fff', ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50), '#000',
  77           0, 230, 170, 60, '#fff', ImageFont.truetype(get_resource('fonts/JunicodeWL-Italic.ttf'), 50), '#000',
  78           None, None
  79           )
  80