Transform: Full snapping support for Vert Slide

Now all options for "snap to" affect the Vert Slide mode.

Reviewed By: campbellbarton

Maniphest Tasks: T66426

Differential Revision: https://developer.blender.org/D3440

1 files changed, 35 insertions, 0 deletions

diff --git a/source/blender/editors/transform/transform_mode_vert_slide.c b/source/blender/editors/transform/transform_mode_vert_slide.c
index 62415b1ddc6..157358016e6 100644
--- a/source/blender/editors/transform/transform_mode_vert_slide.c
+++ b/source/blender/editors/transform/transform_mode_vert_slide.c
@@ -47,6 +47,7 @@
 #include "BLT_translation.h"
 
 #include "transform.h"
+#include "transform_constraints.h"
 #include "transform_convert.h"
 #include "transform_mode.h"
 #include "transform_snap.h"
@@ -538,6 +539,37 @@ void doVertSlide(TransInfo *t, float perc)
   }
 }
 
+static void vert_slide_snap_apply(TransInfo *t, float *value)
+{
+  TransDataContainer *tc = TRANS_DATA_CONTAINER_FIRST_OK(t);
+  VertSlideData *sld = tc->custom.mode.data;
+  TransDataVertSlideVert *sv = &sld->sv[sld->curr_sv_index];
+
+  float snap_point[3], co_orig_3d[3], co_curr_3d[3], dvec[3];
+  copy_v3_v3(co_orig_3d, sv->co_orig_3d);
+  copy_v3_v3(co_curr_3d, sv->co_link_orig_3d[sv->co_link_curr]);
+  if (tc->use_local_mat) {
+    mul_m4_v3(tc->mat, co_orig_3d);
+    mul_m4_v3(tc->mat, co_curr_3d);
+  }
+
+  getSnapPoint(t, dvec);
+  sub_v3_v3(dvec, t->tsnap.snapTarget);
+  if (t->tsnap.snapElem & (SCE_SNAP_MODE_EDGE | SCE_SNAP_MODE_FACE)) {
+    float co_dir_3d[3];
+    sub_v3_v3v3(co_dir_3d, co_curr_3d, co_orig_3d);
+    if (t->tsnap.snapElem & SCE_SNAP_MODE_EDGE) {
+      transform_constraint_snap_axis_to_edge(t, co_dir_3d, dvec);
+    }
+    else {
+      transform_constraint_snap_axis_to_face(t, co_dir_3d, dvec);
+    }
+  }
+
+  add_v3_v3v3(snap_point, co_orig_3d, dvec);
+  *value = line_point_factor_v3(snap_point, co_orig_3d, co_curr_3d);
+}
+
 static void applyVertSlide(TransInfo *t, const int UNUSED(mval[2]))
 {
   char str[UI_MAX_DRAW_STR];
@@ -551,6 +583,7 @@ static void applyVertSlide(TransInfo *t, const int UNUSED(mval[2]))
 
   final = t->values[0];
 
+  applySnapping(t, &final);
   snapGridIncrement(t, &final);
 
   /* only do this so out of range values are not displayed */
@@ -596,6 +629,8 @@ void initVertSlide_ex(TransInfo *t, bool use_even, bool flipped, bool use_clamp)
   t->mode = TFM_VERT_SLIDE;
   t->transform = applyVertSlide;
   t->handleEvent = handleEventVertSlide;
+  t->tsnap.applySnap = vert_slide_snap_apply;
+  t->tsnap.distance = transform_snap_distance_len_squared_fn;
 
   {
     VertSlideParams *slp = MEM_callocN(sizeof(*slp), __func__);