GPencil: New option to lock strokes to axis

Now, the strokes can be locked to a plane set in the cursor location.
This option allow the artist to rotate the view and draw keeping the
strokes flat over the surface. This option is similar to surface option
but doesn't need a object.

The option is only valid for 3D view and strokes in CURSOR mode.

1 files changed, 9 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_scene_types.h b/source/blender/makesdna/DNA_scene_types.h
index 94f23197293..9b0781ebe70 100644
--- a/source/blender/makesdna/DNA_scene_types.h
+++ b/source/blender/makesdna/DNA_scene_types.h
@@ -1160,6 +1160,14 @@ typedef enum eGP_EditBrush_Types {
 	TOT_GP_EDITBRUSH_TYPES
 } eGP_EditBrush_Types;
 
+/* Lock axis options */
+typedef enum eGP_Lockaxis_Types {
+	GP_LOCKAXIS_NONE = 0,
+	GP_LOCKAXIS_X = 1,
+	GP_LOCKAXIS_Y = 2,
+	GP_LOCKAXIS_Z = 3
+} eGP_Lockaxis_Types;
+
 /* Settings for a GPencil Stroke Sculpting Brush */
 typedef struct GP_EditBrush_Data {
 	short size;             /* radius of brush */
@@ -1190,7 +1198,7 @@ typedef struct GP_BrushEdit_Settings {
 	
 	int brushtype;                /* eGP_EditBrush_Types */
 	int flag;                     /* eGP_BrushEdit_SettingsFlag */
-	char pad[4];
+	int lock_axis;                /* lock drawing to one axis */
 	float alpha;                  /* alpha factor for selection color */
 } GP_BrushEdit_Settings;