【IT168 资讯】Results are shown in both JPEG and PNG format.
Also try the configurable sample page.
Images-demo demonstrates the capabilities of the Google App Engine images API. It lets you interactively apply the available transforms to a selected image. A running version of the demo is available at http://images-demo.appspot.com/ You can include your own images in the 'samples' directory. The images api uses the Python Imaging Library locally to transform images during testing on your local machine. You'll need to download the PIL module and install it on your local machine to use the imaging api with the SDK. http://code.google.com/appengine/docs/images/installingPIL.html
Source path: svn/ trunk/ images-demo/ images_demo.py
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 #!/usr/bin/python2.5 # # Copyright 2008 Google Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """Demo for the Google App Engine images API. Provides a simple way to apply transforms to canned images. This file contains all request handlers. """ import os import urllib import wsgiref.handlers from google.appengine.api import images from google.appengine.ext import webapp from google.appengine.ext.webapp import template import image_transformer class TemplatedPage(webapp.RequestHandler): """Base class for templatized handlers.""" def write_template(self, values): """Write out the template with the same name as the class name.""" path = os.path.join(os.path.dirname(__file__), 'templates', self.__class__.__name__ + '.html') self.response.out.write(template.render(path, values)) class MainPage(TemplatedPage): """Request handler for main index page.""" def get(self): """Handle GET request.""" imagelist = os.listdir(os.path.join(os.path.dirname(__file__), 'samples')) values = { 'imagelist': imagelist, 'title': 'App Engine Image Demo' } self.write_template(values) class ImagePage(TemplatedPage): """Request handler for image information display page.""" def get(self): """Handle GET request.""" image = self.request.get('image') if not image: # TODO: More friendly error. self.error(400) return # Transformer is used here only to validate parameters. transformer = image_transformer.ImageTransformer(self.request.params, images.JPEG) transformer.unknown_params.remove('image') # format is not really a transform. while 'format' in transformer.unknown_params: transformer.unknown_params.remove('format') transform_args = urllib.urlencode(transformer.transforms).replace('%2C',',') if (self.request.get('format') == 'png' or self.request.get('format') == 'jpeg'): transform_args += '&format=%s' % (self.request.get('format')) documentation = {} for (method, _) in image_transformer.VALID_TRANSFORMS.iteritems(): documentation[method] = getattr(images.Image, method).__doc__ values = { 'documentation': documentation, 'image': image, 'title': 'App Engine Image Demo', 'transformer': transformer, 'transform_args': transform_args, } self.write_template(values) class SamplePage(TemplatedPage): """Request handler for image transform sample page.""" def get(self): """Handle GET request.""" image = self.request.get('image') if not image: # TODO: More friendly error. self.error(400) return transform_list = [ 'resize=200,200', 'im_feeling_lucky&resize=200,200', 'rotate=90&resize=200,200', 'rotate=180&resize=200,200', 'rotate=360&resize=200,200', 'resize=50,50', 'resize=50,50&resize=200,200', 'resize=200,200&crop=0.0,0.0,0.5,0.5', 'crop=0.5,0.0,1.0,0.5&resize=200,200', 'horizontal_flip&resize=200,200', 'vertical_flip&resize=200,200', ] values = { 'image': image, 'title': 'App Engine Image Demo', 'transform_list': transform_list, } self.write_template(values) class ViewSource(TemplatedPage): """Page handler for view source page.""" def get(self): """Handle GET request. An extremely simple implementation of view source using a template. """ files = ['images_demo.py', 'image_transformer.py'] file_contents = [] for filename in files: f = open(filename, 'r') file_contents += [{'name': filename, 'contents': f.read()}] f.close() values = { 'filecontents': file_contents, 'title': 'App Engine Image Demo Source Code', } self.write_template(values) class ImageData(webapp.RequestHandler): """Request handler for image binary data output.""" def load_local_sample_image(self, filename): """Load a sample image from a (local to this script) filename.""" path = os.path.join(os.path.dirname(__file__), 'samples', filename) f = open(path, 'rb') data = f.read() f.close() return data def get(self): """Handle image data GET.""" image = self.request.get('image') if not image: # TODO: More friendly error. self.error(400) return format = images.JPEG if self.request.get('format') == 'png': format = images.PNG data = self.load_local_sample_image(image) transformer = image_transformer.ImageTransformer(self.request.params, format) data = transformer.transform_image(data) if format == images.PNG: self.response.headers['Content-Type'] = 'image/png' else: self.response.headers['Content-Type'] = 'image/jpeg' self.response.out.write(data) def main(): application = webapp.WSGIApplication([('/', MainPage), ('/tryit', ImagePage), ('/imagedata', ImageData), ('/sample', SamplePage), ('/viewsource', ViewSource), ], debug=True) wsgiref.handlers.CGIHandler().run(application) if __name__ == '__main__': main()
#!/usr/bin/python2.5
#
# Copyright 2008 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Demo for the Google App Engine images API.
Provides a simple way to apply transforms to canned images.
This file contains all request handlers.
"""
import os
import urllib
import wsgiref.handlers
from google.appengine.api import images
from google.appengine.ext import webapp
from google.appengine.ext.webapp import template
import image_transformer
class TemplatedPage(webapp.RequestHandler):
"""Base class for templatized handlers."""
def write_template(self, values):
"""Write out the template with the same name as the class name."""
path = os.path.join(os.path.dirname(__file__), 'templates',
self.__class__.__name__ + '.html')
self.response.out.write(template.render(path, values))
class MainPage(TemplatedPage):
"""Request handler for main index page."""
def get(self):
"""Handle GET request."""
imagelist = os.listdir(os.path.join(os.path.dirname(__file__), 'samples'))
values = {
'imagelist': imagelist,
'title': 'App Engine Image Demo'
}
self.write_template(values)
class ImagePage(TemplatedPage):
"""Request handler for image information display page."""
def get(self):
"""Handle GET request."""
image = self.request.get('image')
if not image:
# TODO: More friendly error.
self.error(400)
return
# Transformer is used here only to validate parameters.
transformer = image_transformer.ImageTransformer(self.request.params,
images.JPEG)
transformer.unknown_params.remove('image')
# format is not really a transform.
while 'format' in transformer.unknown_params:
transformer.unknown_params.remove('format')
transform_args = urllib.urlencode(transformer.transforms).replace('%2C',',')
if (self.request.get('format') == 'png'
or self.request.get('format') == 'jpeg'):
transform_args += '&format=%s' % (self.request.get('format'))
documentation = {}
for (method, _) in image_transformer.VALID_TRANSFORMS.iteritems():
documentation[method] = getattr(images.Image, method).__doc__
values = {
'documentation': documentation,
'image': image,
'title': 'App Engine Image Demo',
'transformer': transformer,
'transform_args': transform_args,
}
self.write_template(values)
class SamplePage(TemplatedPage):
"""Request handler for image transform sample page."""
def get(self):
"""Handle GET request."""
image = self.request.get('image')
if not image:
# TODO: More friendly error.
self.error(400)
return
transform_list = [
'resize=200,200',
'im_feeling_lucky&resize=200,200',
'rotate=90&resize=200,200',
'rotate=180&resize=200,200',
'rotate=360&resize=200,200',
'resize=50,50',
'resize=50,50&resize=200,200',
'resize=200,200&crop=0.0,0.0,0.5,0.5',
'crop=0.5,0.0,1.0,0.5&resize=200,200',
'horizontal_flip&resize=200,200',
'vertical_flip&resize=200,200',
]
values = {
'image': image,
'title': 'App Engine Image Demo',
'transform_list': transform_list,
}
self.write_template(values)
class ViewSource(TemplatedPage):
"""Page handler for view source page."""
def get(self):
"""Handle GET request.
An extremely simple implementation of view source using a template.
"""
files = ['images_demo.py', 'image_transformer.py']
file_contents = []
for filename in files:
f = open(filename, 'r')
file_contents += [{'name': filename,
'contents': f.read()}]
f.close()
values = {
'filecontents': file_contents,
'title': 'App Engine Image Demo Source Code',
}
self.write_template(values)
class ImageData(webapp.RequestHandler):
"""Request handler for image binary data output."""
def load_local_sample_image(self, filename):
"""Load a sample image from a (local to this script) filename."""
path = os.path.join(os.path.dirname(__file__), 'samples', filename)
f = open(path, 'rb')
data = f.read()
f.close()
return data
def get(self):
"""Handle image data GET."""
image = self.request.get('image')
if not image:
# TODO: More friendly error.
self.error(400)
return
format = images.JPEG
if self.request.get('format') == 'png':
format = images.PNG
data = self.load_local_sample_image(image)
transformer = image_transformer.ImageTransformer(self.request.params,
format)
data = transformer.transform_image(data)
if format == images.PNG:
self.response.headers['Content-Type'] = 'image/png'
else:
self.response.headers['Content-Type'] = 'image/jpeg'
self.response.out.write(data)
def main():
application = webapp.WSGIApplication([('/', MainPage),
('/tryit', ImagePage),
('/imagedata', ImageData),
('/sample', SamplePage),
('/viewsource', ViewSource),
],
debug=True)
wsgiref.handlers.CGIHandler().run(application)
if __name__ == '__main__': main()
