Format.KML: export style.

[fredj]

Ability to export the feature style.

See:

•  http://code.google.com/apis/kml/documentation/kmlreference.html#styleurl
•  http://code.google.com/apis/kml/documentation/kmlreference.html#style

[fredj]

first draft

[fredj]

export LabelStyle, clean code

[fredj]

sync to trunk version

[pgiraud]

2409.3.patch adds the support for iconStyle write (at least partially).

The patch needs more work on the following points:

• we should support 2.0 and 2.2 differently. This affects both write and read methods. For example w, h, x and y <Icon> attributes are deprecated in 2.2. This means that the way we set the graphicWidth and graphicHeight when reading a 2.2 KML may be wrong if the graphic is not as high as large.
• placemarks with a point but no icon style (yellow pin in gEarth) will mostly be rendered in OpenLayers with a circle with no dimensions. We may need to set a default value for pointRadius in this case.

What the patch does not supported yet:

• graphic offsets,
• rotation.

What the KML writer will not support because it's specific to OpenLayers:

• graphicName,
• graphic width and height (both set to get a width/height ratio different from the image original one).

[pgiraud]

completed patch with iconStyle (partial) support

[fredj]

nobody's working on this -> Future