move to django 1.4 and django-pipeline,

[wolnelektury.git] / apps / sponsors / models.py

diff --git a/apps/sponsors/models.py b/apps/sponsors/models.py
index 1df990f..3ca1a48 100644 (file)
--- a/apps/sponsors/models.py
+++ b/apps/sponsors/models.py
@@ -1,16 +1,27 @@
+# -*- coding: utf-8 -*-
+# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
+import time
+from StringIO import StringIO
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 from django.template.loader import render_to_string
+from PIL import Image
 
-from sponsors.fields import JSONField
+from jsonfield import JSONField
+from django.core.files.base import ContentFile
+
+THUMB_WIDTH = 120
+THUMB_HEIGHT = 120
 
 
 class Sponsor(models.Model):
     name = models.CharField(_('name'), max_length=120)
     _description = models.CharField(_('description'), blank=True, max_length=255)
-    logo = models.ImageField(_('logo'), upload_to='sponsors/sponsor/logo')
+    logo = models.ImageField(_('logo'), upload_to='sponsorzy/sponsor/logo')
     url = models.URLField(_('url'), blank=True, verify_exists=False)
-    
+
     def __unicode__(self):
         return self.name
 
@@ -23,34 +34,64 @@ class Sponsor(models.Model):
 
 class SponsorPage(models.Model):
     name = models.CharField(_('name'), max_length=120)
-    column_width = models.PositiveIntegerField(_('column width'), default=200)
     sponsors = JSONField(_('sponsors'), default={})
     _html = models.TextField(blank=True, editable=False)
-    
+    sprite = models.ImageField(upload_to='sponsorzy/sprite', blank=True)
+
     def populated_sponsors(self):
         result = []
-        for column in self.get_sponsors_value():
+        offset = 0
+        for column in self.sponsors:
             result_group = {'name': column['name'], 'sponsors': []}
             sponsor_objects = Sponsor.objects.in_bulk(column['sponsors'])
             for sponsor_pk in column['sponsors']:
                 try:
-                    result_group['sponsors'].append(sponsor_objects[sponsor_pk])
+                    result_group['sponsors'].append((offset, sponsor_objects[sponsor_pk]))
+                    offset -= THUMB_HEIGHT
                 except KeyError:
                     pass
             result.append(result_group)
         return result
-    
+
+    def render_sprite(self):
+        sponsor_ids = []
+        for column in self.sponsors:
+            sponsor_ids.extend(column['sponsors'])
+        sponsors = Sponsor.objects.in_bulk(sponsor_ids)
+        sprite = Image.new('RGBA', (THUMB_WIDTH, len(sponsors) * THUMB_HEIGHT))
+        for i, sponsor_id in enumerate(sponsor_ids):
+            simg = Image.open(sponsors[sponsor_id].logo.path)
+            if simg.size[0] > THUMB_WIDTH or simg.size[1] > THUMB_HEIGHT:
+                size = (
+                    min(THUMB_WIDTH, 
+                        simg.size[0] * THUMB_HEIGHT / simg.size[1]),
+                    min(THUMB_HEIGHT,
+                        simg.size[1] * THUMB_WIDTH / simg.size[0])
+                )
+                simg = simg.resize(size, Image.ANTIALIAS)
+            sprite.paste(simg, (
+                    (THUMB_WIDTH - simg.size[0]) / 2,
+                    i * THUMB_HEIGHT + (THUMB_HEIGHT - simg.size[1]) / 2,
+                    ))
+        imgstr = StringIO()
+        sprite.save(imgstr, 'png')
+
+        if self.sprite:
+            self.sprite.delete(save=False)
+        self.sprite.save('sponsorzy/sprite/%s-%d.png' % (self.name, time.time()), ContentFile(imgstr.getvalue()), save=False)
+
     def html(self):
         return self._html
     html = property(fget=html)
 
     def save(self, *args, **kwargs):
+        self.render_sprite()
         self._html = render_to_string('sponsors/page.html', {
-            'column_width': self.column_width,
             'sponsors': self.populated_sponsors(),
+            'page': self
         })
         return super(SponsorPage, self).save(*args, **kwargs)
-    
+
     def __unicode__(self):
         return self.name