Z-indexing/Y-ordering Patch

[tcoulter]

Attached is a patch for z-indexing/y-ordering for external graphics.

For an example of how to use z-indexing, see here:

•  http://trac.openplans.org/nymap/browser/NYCMapConfig.js?rev=632#L45.

Notice the "graphicZIndex" attribute attached to a feature's style. For this example, there's also a backgroundGraphicZIndex attribute; this is not included in this patch, and is instead an application specific variable.

To set a vector layer to use y-ordering in addition to z-indexing, pass the option {ordering: "y"} to the Vector layer. Example here:

•  http://trac.openplans.org/nymap/browser/Vespucci/Application.js?rev=632#L200

[tcoulter]

Updated ordering patch that includes support for background graphics.

[tcoulter]

Just added an updated patch for the ordering stuff that includes support for background graphics. Originally, background graphics -- such as shadows -- were the motivation for writing the ordering code. The two are very coupled, so I've lumped them into one patch.

[tcoulter]

Attaching a new patch which I'll be slating for review. This patch includes everything in the ordering-updated.patch as well as fixes for tests that ordering-updated.patch broke. The tests were slightly rewritten to reduce complexity and code duplication.

[tcoulter]

Ordering patch slated for review.

[tcoulter]

Alright, new patch. This time, there's an example (examples/ordering.html), as well as changed the way y-ordering is specified on the layer (you don't use "z", and "y" anymore; you just say yOrdering: true).

[tcoulter]

Now with example! :)

[euzuro]

some stylistic updates and testing updates... still not finished but getting there!

[tcoulter]

Updated ordering patch with background graphic/shadow example.

[tcoulter]

Oops. Forgot to add new files to svn.

[tcoulter]

The shadow image for marker shadown.

[tcoulter]

Fixed erasing of background nodes.

[euzuro]

(In [7652]) ordering <exclamation point/>. you can now gracefully z-order your vectors... and you can even 'yOrder' them and add background images, making for a nice 3dish look. be sure to check out the two new example html's: marker-shadow.html and ordering.html. Big thanks to tcoulter (funkyc) for a prolonged effort with this patch. It has come a long way and now what a beautiful finish. (Closes #1357)