2009-02-08  Michael Natterer  <mitch@gimp.org>

	Bug 520078 – Rotate brushes

	Applied a slightly modified patch from Alexia Death:

	* app/core/core-types.h (struct GimpCoords): add "direction" member.

	* app/core/gimpcoords.c: take direction into account in mix(),
	scalarprod(), length_squared(), manhattan_dist() and equal().

	* app/core/gimpcoords-interpolate.c
	(gimp_coords_interpolate_catmull): same here.
	* app/display/gimpdisplayshell-coords.c

	(gimp_display_shell_eval_event): same here.

	* app/paint/gimppaintoptions.[ch]: add properties for direction
	dynamics and adapt dynamics mixing accordingly.

	* app/paint/gimpbrushcore.c (gimp_brush_core_interpolate):
	"interpolate" direction too (in fact, just copy it from
	last_coords since it doesn't change along a straight line).

	* app/paint/gimppaintcore-stroke.c
	(gimp_paint_core_stroke_emulate_dynamics): emulate direction too.

	* app/tools/gimppaintoptions-gui.c: add GUI for direction dynamics.


svn path=/trunk/; revision=28001