Irregular transformation support for TransformControl

[tomh]

There doesn't seem to be a component for Control.TransformControl yet so I'm raising this against Control instead...

Currently all the transformations done by the TransformControl are symmetrical about the centre. The attached patch adds an "irregular" option (to parallel the option of the same name in the RegularPolygon handler used for drawing features) that allows each edge/corner to be dragged independently to resize a feature.

[ahocevar]

Can you please add unit tests and a bit more docs for the new irregular option?

[rdewit]

This patch does not work for the left geometry (45 degree rotation preset) in the transform-feature example (add 'irregular: true' to the control options). The feature moves around. It seems to do the job for the right feature.

[tomh]

Updated patch which works with rotated features and has tests

[tomh]

I have fixed the problem with resizing of rotated features and added some tests and documentation for the irregular flag.

In addition to the attached patch, the changes are available in my git tree at:

 https://github.com/tomhughes/openlayers/tree/ticket-2598

[ahocevar]

Fixed with  https://github.com/openlayers/openlayers/commit/485ec033e91162d50baea062fbdc9a860261142b