The "teac" (measurement info) patch from Campbell Barton

Cleaned code somewhat (half the size!) and applied some changes:
- made it compatible with selection flags for new mesh editing (edge/face)
- renamed 'face angles' to 'edge angles' and made it display angles for
  2 selected edges too
- removed the confusing convention that always drawed the info if one
  of the vertices of edge/face/angle was selected. now it only displays on
  minimum of 1 full edge or face selected.
- made it react to "zbuf occluded selection" option (for zbuffered text)
- made it also colorize text for white theme color (TH_TEXT)

On larger meshes this info still draws very confusing. The idea of displaying
the info on 1 vertex selected was probably to show values while grabbing,
although that didnt really work for angles. One idea could be, for transform,
that it draws all lenghts/angles/areas that get changed during transform

All in all, still useful addition tho!

1 files changed, 14 insertions, 0 deletions

diff --git a/source/blender/blenlib/intern/arithb.c b/source/blender/blenlib/intern/arithb.c
index c4dd5de3a0e..1c56bba45a4 100644
--- a/source/blender/blenlib/intern/arithb.c
+++ b/source/blender/blenlib/intern/arithb.c
@@ -2205,6 +2205,20 @@ void VecRotToQuat( float *vec, float phi, float *quat)
 	}
 }
 
+/* Return the angle in degrees between vecs 1-2 and 2-3 */
+float VecAngle3( float *v1, float *v2, float *v3)
+{
+	float vec1[3], vec2[3];
+
+	VecSubf(vec1, v2, v1);
+	VecSubf(vec2, v3, v1);
+	Normalise(vec1);
+	Normalise(vec2);
+	
+	return saacos(vec1[0]*vec2[0] + vec1[1]*vec2[1] + vec1[2]*vec2[2]) * 360.0/M_PI;
+}
+
+
 void euler_rot(float *beul, float ang, char axis)
 {
 	float eul[3], mat1[3][3], mat2[3][3], totmat[3][3];