tag:blogger.com,1999:blog-5608455.post-1133396080802276442005-12-01T01:00:00.000+01:002005-12-03T14:59:11.306+01:00After I came across <a href="http://hivelogic.com/articles/2005/11/30/random_image_rotation_in_rails">this</a> I decided that I should write something about the same thing but done in Nevow.<br />First of all the task is to write a random image rotation implementation for jpegs, gifs and pngs. This is easily accomplished by doing the following 3 things:<br /><br />1. Add this to the root Page of your web site. 'random/images/directory' is a directory in your HDD containing lots of images and other random data.<br /> <pre><code>child_random_images = static.File('random/images/directory')</code></pre><br />2. Add this to each of your Page objects that use the random image (or use a common base class to have this behaviour everywhere for free):<br /> <pre><code> <br />def render_random_image(self, ctx, data):<br /> files = [f for f in os.listdir('random/images/directory') <br /> if os.path.splitext(f)[1] in ['.jpg', '.gif', '.png']]<br /> return ctx.tag(src='/random_images/'+random.choice(files))<br /> </pre></code><br />3. Use the following tag wherever you want to have a randomly rotated image in your web app:<br /> <pre><code> &lt;img nevow:render="random_image" alt="Random Image" /&gt; </code></pre><br />Now you have a wonderfully randomly rotated image in your web browser and with 2 lines less than the Ruby On Rails counterpart without sacrifying readability too much.<div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/5608455-113339608080227644?l=vvolonghi.blogspot.com' alt='' /></div>Valentinohttp://www.blogger.com/profile/13519795655711289924noreply@blogger.com2