I came across several approaches for managing thumbnails of images and
then I wrote mine to allow user to specify any number of thumbnail
images to be created.
When initializing the field class, specify the dimensions that you
want to have like:
photo = ImageWithThumbsField(upload_to = 'path', dims = ((60, 60),
(120, 120), (600, 600)))
And this class takes care of creation and deletion of the images:
class ImageWithThumbsField(models.ImageField):
def __init__(self, dims = None, *args, **kwargs):
super(ImageWithThumbsField, self).__init__(*args, **kwargs)
self.dims = dims
def save_file(self, new_data, new_object, original_object, change,
rel, save):
super(ImageWithThumbsField, self).save_file(new_data,
new_object, original_object, change, rel, save)
directory = self.get_directory_name()
im = Image.open('%s%s/%s' % (settings.MEDIA_ROOT,
directory,
new_data['image_file']
['filename']))
for dim in self.dims:
# resize image
scale = min(float(dim[0])/im.size[0], float(dim[1])/
im.size[1])
if scale > 1:
newim = im
else:
width = int(im.size[0] * scale)
height = int(im.size[1] * scale)
newim = im.resize((width, height), Image.ANTIALIAS)
newim.save('%s%s/%dx%d_%s' % (settings.MEDIA_ROOT,
directory,
dim[0], dim[1],
new_data['image_file']
['filename']), im.format)
def delete_file(self, instance):
super(ImageWithThumbsField, self).delete_file(instance)
(directory, filename) = os.path.split(instance.image)
for dim in self.dims:
try:
os.unlink('%s%s/%dx%d_%s' % (settings.MEDIA_ROOT,
directory,
dim[0], dim[1],
filename))
except (IOError, OSError):
pass
def get_url(self, dim, filename):
return '%s/%s/%dx%d_%s' % (settings.MEDIA_URL,
self.get_directory_name(),
dim[0], dim[1],
filename)
What I couldn't do is to dynamically add methods to return the url of
a resized image when its dimensions are given. I want the image urls
to be accessible like img.image_60x60_url(), if a thumb with
dimensions 60x60 exists.
So, I added the get_url method that returns the url for that purpose
and tried setattr in the loop in the save_file to add those methods as
follows:
for dim in self.dims:
setattr(self, 'image_%dx%d_url' % (dim[0], dim[1]),
self.get_url(dim, new_data['image_file']['filename']))
and I couldn't access it in the views and templates. Then I tried
contribute_to_class but I couldn't find clear documentation of this
method and after some trial and error, I decided to ask for help.
Thanks for any suggestions...
oMat
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Django users" group.
To post to this group, send email to django-users@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/django-users?hl=en
-~----------~----~----~----~------~----~------~--~---
