While most of our transform tools use an interactive transform
grid, and have similar behavior, the flip tool is an odd one out.
The new "auto straighten" function of the measure tool introduces
another tool that performs transformations, while not behaving like
the rest of the transform tools.
Factor out the parts of GimpTransformTool that handle user
interaction into GimpTransformGridTool (with corresponding
GimpTransformGridOptions, and GimpTransformGridToolUndo), and only
leave the basic transform functionality and options in
GimpTransformTool (and GimpTransformOptions).
Derive all the transform tools (and transform-tool base classes)
that previously derived from GimpTransformTool, from
GimpTransformGridTool. The one exception is GimpFlipTool, which
still derives from GimpTransformTool directly. The next commit
will derive GimpMeasureTool from GimpTransformTool as well.
and remove lots of labels from calls to gimp_prop_foo_new(). Also
had to manually remove some unwanted labels that are now added
automatically, fixes bug #761880.
Reorganize tool modes to be { ADD_TRANSFORM, MOVE, REMOVE }, where
ADD_TRANSFORM is the default and allows to add handles *and* transform
the image in one click-drag. MOVE moves handles without transforming
(shift) and REMOVE removes handles (control). Also improve cursors to
accurately show the result of a click.
Add new tool GimpHandleTransformTool which allows to freely place up
to 4 handles on the image, then move any one of them, which transforms
the image so that the remaining handles keep their position.
Did quite some cleanup on the code before pushing --Mitch
