Add support for the extremely awesomely super-comprehensive rule based styling
that Andreas has been working so hard on. I think this is the single most
awesome commit I've ever had the pleasure of committing. The results of this
commit are described on http://trac.openlayers.org/wiki/Styles: essentially,
this makes it possible to style features in all kinds of fun ways based on
rules, and will also form the underlying basis for #533. Things this patch
adds:
- OL.Rule classes. These classes allow you to do tests against the propertie
of a feature, and set a style based on these properties -- so you can
compare the 'speedlimit' property of a line, and test if it is > 60, and if
it is greater than 60, render it in a different color. You can also test
combinations of rules using the OL.Rule.Logical class, and test featureids
with the FeatureID class.
- OL.Style class: The OL.Style class lets you wrap up Rules into styles that
can be used with drawFeature to draw the feature in the selected style.
- OL.Layer.Vector.drawFeature will check if the given style is an OL.Style
object, and if so, it will draw the feature accordingly.
examples/georss-flickr.html shows usage of these classes.
Many, many thanks go to Andreas for all his hard work on this: this code really
is very pretty, and includes unit tests for all the classes (and we know that I
am a big fan of tests.)
Three cheers for Andreas: Hip hip, hooray! hip hip, hooray! hip hip, hooray!
