Example 4: a more complex application

In this application, volunteers locate fossils in images of desert terrain. They can locate several (zero or more) fossils in the same image, and can associate a type and a comment with each annotation. They can remove existing annotations. When they're all done, they click a "Done" button.

This is implemented as a sequence of web pages; each addition or deletion of an annotation goes to a new web page. Hence, in addition to the job_show() callback function, the application uses a separate web page, user/bossa_example4.php, that handles the edit operations.

The application is implemented by three scripts in ~/projects/test/html/:

• ops/bossa_example4_make_jobs.php: a script that creates jobs.
• inc/bossa_example4.inc: the application's callback functions.
• user/bossa_example4.php: the handler for editing operations.

Creating jobs

Using the administrative interface, create an application named "bossa_example4". Create a directory ~/projects/test/html/user/example4_images. Put some images (.png or .jpg) there; a good source is ​http://isaac.ssl.berkeley.edu/test/example4_images/

Now go to the project's ops/ directory and type

php bossa_example4_make_jobs.php --dir example4_images

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