pass class variables by reference for performance

Cleaned up a bit; fixed struct vs. class forward declarations.

Snap to grid/guide lines perpendicularly

Cleanup pass on documentation that was dumping garbage into doxygen output.

Rename the struct "SnappedConstraints" to the more meaningfull "IntermSnapResults"

Simplify code related to snapping while rotating

- Snap while rotating an object using the selector tool - Rename the ConstraintLine class to SnapConstraint - Move some duplicated code to 2geom

Fix bounding box snapping (LP562205, comment 6, issue II)

refactoring the snapping code (laying the groundwork for my next commit which reduces snap jitter)

Snap to a guide's origin too (resulting in a 2D constraint), instead of only to the guide itself (only 1D constraint)

Remove obsolete includes of libnr files in the snapping code

* Implement constrained snapping of knots * Implement snapping of the rectangle's radius handles * Line snappers: set the snap target in the derived class instead of in findBestSnap()

The snap indicator's tooltip now displays "A to B", whereas before it only displayed "B".

Store the snapper tolerances in the snap-preferences instead of in each snapper individualy. This way we don't have to update all snappers when the namedview has been updated (and we can get rid of the _update_snap_distances() call)

1) snap midpoints of line segments (both as source and as target) 2) snap intersections within a single shape (as source; as target was already implemented)

If a snapper needs a reference to a SPNamedView or a SPDesktop, then get that reference via the SnapManager (instead of storing references in the snapper and accessing them directly)

Move all of the snapper code to 2geom

Groundwork to snap to intersections, e.g. intersections of gridlines with guidelines, and of objects with other objects. The snappers used to return only SnappedPoints, but now also SnappedLines and SnappedInfiniteLines can be returned. SnappedPaths will be implemented later.

Improve readability and remove some unused code

Improve snapper performance (mainly in by editting WillSnapSomething())

Removal of old grid code - fully enabled new grid code.

Clean up knutux's fix for the snapper crash.

Temporary fix for broken snap functionality: as named view constructor is never called, virtual tables of Snapper derived classes are never initialized. Fix - calling constructor/destructor on SPNamedView init/release.

moving trunk for module inkscape