student-teacher customization

[librarian.git] / librarian / cover.py

diff --git a/librarian/cover.py b/librarian/cover.py
index a7fc674..7343e68 100644 (file)
--- a/librarian/cover.py
+++ b/librarian/cover.py
@@ -3,37 +3,192 @@
 # This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
 # This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #

-import Image, ImageFont, ImageDraw
-from librarian import get_resource
+import re
+from PIL import Image, ImageFont, ImageDraw, ImageFilter
+from StringIO import StringIO
+from librarian import get_resource, IOFile

 
 
 
 

-def cover(width, height, author, title):
-    def draw_centered_text(text, draw, font, width, pos_y, lineskip):
+class TextBox(object):
+    """Creates an Image with a series of centered strings."""
+
+    SHADOW_X = 3
+    SHADOW_Y = 3
+    SHADOW_BLUR = 3
+
+    def __init__(self, max_width, max_height, padding_x=None, padding_y=None):
+        if padding_x is None:
+            padding_x = self.SHADOW_X + self.SHADOW_BLUR
+        if padding_y is None:
+            padding_y = self.SHADOW_Y + self.SHADOW_BLUR
+
+        self.max_width = max_width
+        self.max_text_width = max_width - 2 * padding_x
+        self.padding_y = padding_y
+        self.height = padding_y
+        self.img = Image.new('RGBA', (max_width, max_height))
+        self.draw = ImageDraw.Draw(self.img)
+        self.shadow_img = None
+        self.shadow_draw = None
+
+    def skip(self, height):
+        """Skips some vertical space."""
+        self.height += height
+
+    def text(self, text, color='#000', font=None, line_height=20,
+             shadow_color=None):
+        """Writes some centered text."""
+        text = re.sub(r'\s+', ' ', text)
+        if shadow_color:
+            if not self.shadow_img:
+                self.shadow_img = Image.new('RGBA', self.img.size)
+                self.shadow_draw = ImageDraw.Draw(self.shadow_img)

         while text:
             line = text
         while text:
             line = text

-            while draw.textsize(line, font=font)[0] > width:
-                try:
-                    line, ext = line.rsplit(' ', 1)
-                except:
+            line_width = self.draw.textsize(line, font=font)[0]
+            while line_width > self.max_text_width:
+                parts = line.rsplit(' ', 1)
+                if len(parts) == 1:
+                    line_width = self.max_text_width

                     break
                     break

-            draw.text(((img.size[0] - draw.textsize(line, font=font)[0]) / 2, pos_y), line, font=font, fill='#000')
-            pos_y += lineskip
-            text = text[len(line)+1:]
-        return pos_y
+                line = parts[0]
+                line_width = self.draw.textsize(line, font=font)[0]
+            line = line.strip() + ' '
+
+            pos_x = (self.max_width - line_width) / 2
+
+            if shadow_color:
+                self.shadow_draw.text(
+                        (pos_x + self.SHADOW_X, self.height + self.SHADOW_Y),
+                        line, font=font, fill=shadow_color
+                )
+
+            self.draw.text((pos_x, self.height), line, font=font, fill=color)
+            self.height += line_height
+            # go to next line
+            text = text[len(line):]
+
+    def image(self):
+        """Creates the actual Image object."""
+        image = Image.new('RGBA', (self.max_width,
+                                   self.height + self.padding_y))
+        if self.shadow_img:
+            shadow = self.shadow_img.filter(ImageFilter.BLUR)
+            image.paste(shadow, (0, 0), shadow)
+            image.paste(self.img, (0, 0), self.img)
+        else:
+            image.paste(self.img, (0, 0))
+        return image
+
+
+class Cover(object):
+    """Abstract base class for cover images generator."""
+    width = 600
+    height = 800
+    background_color = '#fff'
+    background_img = None
+
+    author_top = 100
+    author_margin_left = 20
+    author_margin_right = 20
+    author_lineskip = 40
+    author_color = '#000'
+    author_shadow = None
+    author_font = None
+
+    title_top = 100
+    title_margin_left = 20
+    title_margin_right = 20
+    title_lineskip = 54
+    title_color = '#000'
+    title_shadow = None
+    title_font = None
+
+    logo_bottom = None
+    logo_width = None
+    uses_dc_cover = False
+
+    format = 'JPEG'
+
+    exts = {
+        'JPEG': 'jpg',
+        'PNG': 'png',
+        }
+
+    mime_types = {
+        'JPEG': 'image/jpeg',
+        'PNG': 'image/png',
+        }
+
+    def __init__(self, book_info, format=None):
+        self.author = ", ".join(auth.readable() for auth in book_info.authors)
+        self.title = book_info.title
+        if format is not None:
+            self.format = format
+
+    def pretty_author(self):
+        """Allows for decorating author's name."""
+        return self.author
+
+    def pretty_title(self):
+        """Allows for decorating title."""
+        return self.title
+
+    def image(self):
+        img = Image.new('RGB', (self.width, self.height), self.background_color)
+
+        if self.background_img:
+            background = Image.open(self.background_img)
+            img.paste(background, None, background)
+            del background
+
+        # WL logo
+        if self.logo_width:
+            logo = Image.open(get_resource('res/wl-logo.png'))
+            logo = logo.resize((self.logo_width, logo.size[1] * self.logo_width / logo.size[0]))
+            img.paste(logo, ((self.width - self.logo_width) / 2, img.size[1] - logo.size[1] - self.logo_bottom))
+
+        top = self.author_top
+        tbox = TextBox(
+            self.width - self.author_margin_left - self.author_margin_right,
+            self.height - top,
+            )
+        author_font = self.author_font or ImageFont.truetype(
+            get_resource('fonts/DejaVuSerif.ttf'), 30)
+        tbox.text(self.pretty_author(), self.author_color, author_font,
+            self.author_lineskip, self.author_shadow)
+        text_img = tbox.image()
+        img.paste(text_img, (self.author_margin_left, top), text_img)
+
+        top += text_img.size[1] + self.title_top
+        tbox = TextBox(
+            self.width - self.title_margin_left - self.title_margin_right,
+            self.height - top,
+            )
+        title_font = self.author_font or ImageFont.truetype(
+            get_resource('fonts/DejaVuSerif.ttf'), 40)
+        tbox.text(self.pretty_title(), self.title_color, title_font,
+            self.title_lineskip, self.title_shadow)
+        text_img = tbox.image()
+        img.paste(text_img, (self.title_margin_left, top), text_img)

 
 

+        return img

 
 

-    img = Image.new('RGB', (width, height), (255, 255, 255))
+    def mime_type(self):
+        return self.mime_types[self.format]

 
 

-    # WL logo
-    logo = Image.open(get_resource('pdf/wl-logo.png'))
-    logo = logo.resize((img.size[0] / 2, logo.size[1] * img.size[0] / 2 / logo.size[0]))
-    img.paste(logo, (width / 4, img.size[1] - logo.size[1]))
+    def ext(self):
+        return self.exts[self.format]

 
 

-    draw = ImageDraw.Draw(img)
-    author_font = ImageFont.truetype(get_resource('fonts/DejaVuSerif.ttf'), width/20)
-    title_y = draw_centered_text(author, draw, author_font, width*9/10, height/10, width/15) + height/10
+    def save(self, *args, **kwargs):
+        return self.image().save(format=self.format, *args, **kwargs)

 
 

-    title_font = ImageFont.truetype(get_resource('fonts/DejaVuSerif.ttf'), width/15)
-    draw_centered_text(title, draw, title_font, width*9/10, title_y, width/11)
+    def output_file(self, *args, **kwargs):
+        imgstr = StringIO()
+        self.save(imgstr, *args, **kwargs)
+        return IOFile.from_string(imgstr.getvalue())

 
 

-    return img
+    def for_pdf(self):
+        return IOFile.from_filename(get_resource('pdf/cover_image.sty'), {
+            'cover.png': self.output_file(),
+        })