== Transform ==

Embryon functionnality for snapping.

- Only snaps to grid on translations (grab)
- Transform constraints are supported but header display is wrong.
- Can be turned on/off in the Object/Mesh header menu under Transform Properties (tentative spot, will have to integrate better and in other object type menus too)
- Can be turned on/off during transform with ` (Back Quote, also tentative)

This is, of course, very much Work in Progress.

This implements part of the structural ideas for the transform cleanup I've been juggling around with.

1 files changed, 25 insertions, 2 deletions

diff --git a/source/blender/include/transform.h b/source/blender/include/transform.h
index ec55b768381..d91fe81d991 100755
--- a/source/blender/include/transform.h
+++ b/source/blender/include/transform.h
@@ -59,6 +59,13 @@ typedef struct NumInput {
 		Negative	: number is negative
 */
 
+typedef struct TransSnap {
+	int  status;
+	float snapPoint[3];
+	void (*applySnap)(struct TransInfo *, float *);
+	void (*calcSnap)(struct TransInfo *, float *);
+} TransSnap;
+
 typedef struct TransCon {
     char  text[50];      /* Description of the Constraint for header_print                            */
     float mtx[3][3];     /* Matrix of the Constraint space                                            */
@@ -147,6 +154,7 @@ typedef struct TransInfo {
 	TransDataExtension *ext;	/* transformed data extension (array)   */
 	TransData2D *data2d;		/* transformed data for 2d (array)      */
     TransCon    con;            /* transformed constraint               */
+    TransSnap	tsnap;
     NumInput    num;            /* numerical input                      */
     char        redraw;         /* redraw flag                          */
 	float		propsize;		/* proportional circle radius           */
@@ -331,6 +339,23 @@ void postSelectConstraint(TransInfo *t);
 
 void setNearestAxis(TransInfo *t);
 
+/*********************** Snapping ********************************/
+
+typedef enum {
+	NO_GEARS 	= 0,
+	BIG_GEARS	= 1,
+	SMALL_GEARS	= 2
+} GearsType;
+
+void snapGrid(TransInfo *t, float *val);
+void snapGridAction(TransInfo *t, float *val, GearsType action);
+
+void initSnapping(struct TransInfo *t);
+void applySnapping(TransInfo *t, float *vec);
+void resetSnapping(TransInfo *t);
+int  handleSnapping(TransInfo *t, int event);
+void drawSnapping(TransInfo *t);
+
 /*********************** Generics ********************************/
 
 void initTrans(TransInfo *t);
@@ -356,8 +381,6 @@ void calculateCenterCursor(TransInfo *t);
 
 void calculatePropRatio(TransInfo *t);
 
-void snapGrid(TransInfo *t, float *val);
-
 void getViewVector(float coord[3], float vec[3]);
 
 TransInfo * BIF_GetTransInfo(void);