Define the Models for implementing Quizzes (collections of Questions) and their
Responses (collections of Answers to those Questions). These Models would
form the basis of storage for such items as:
Terms of Service (Quiz)
Question ("I agree...")
Response -> Answer (answer to "I agree..." confirmation)
solution ("Yes" Answer to the "I agree..." Question)
Mentor and Student surveys (Quiz)
Questions (including "Pay this student?")
Response -> Answers
solution ("Yes" Answer to the "Pay this student?" Question)
Organization applications
Student Proposal review, comment, and scoring system
GHOP task tracking (a specific task list item would be a Quiz)
Patch by: Todd Larsen
Review by: Pawel Solyga, Sverre Rabbelier, Chen Lunpeng
Review URL: http://codereviews.googleopensourceprograms.com/1403
"""
Utility functions for handling images.
Requires PIL, as you might imagine.
"""
from django.core.files import File
class ImageFile(File):
"""
A mixin for use alongside django.core.files.base.File, which provides
additional features for dealing with images.
"""
def _get_width(self):
return self._get_image_dimensions()[0]
width = property(_get_width)
def _get_height(self):
return self._get_image_dimensions()[1]
height = property(_get_height)
def _get_image_dimensions(self):
if not hasattr(self, '_dimensions_cache'):
self._dimensions_cache = get_image_dimensions(self)
return self._dimensions_cache
def get_image_dimensions(file_or_path):
"""Returns the (width, height) of an image, given an open file or a path."""
from PIL import ImageFile as PILImageFile
p = PILImageFile.Parser()
if hasattr(file_or_path, 'read'):
file = file_or_path
else:
file = open(file_or_path, 'rb')
while 1:
data = file.read(1024)
if not data:
break
p.feed(data)
if p.image:
return p.image.size
return None