GPencil: New Simplify modifier mode Sample and operator

This mode simplify the stroke doing a resampling of the points and generate new geometry at the distance defined.

Sample function developed by @NicksBest

New Resample Stroke operator

This operator recreates the stroke geometry with a predefined length between points.

The operator uses the same code used in Simplify modifier.

Reviewers: @mendio

1 files changed, 19 insertions, 8 deletions

diff --git a/source/blender/gpencil_modifiers/intern/MOD_gpencilsimplify.c b/source/blender/gpencil_modifiers/intern/MOD_gpencilsimplify.c
index 746a689c08e..06f6f012818 100644
--- a/source/blender/gpencil_modifiers/intern/MOD_gpencilsimplify.c
+++ b/source/blender/gpencil_modifiers/intern/MOD_gpencilsimplify.c
@@ -66,7 +66,7 @@ static void deformStroke(GpencilModifierData *md,
                                       mmd->layername,
                                       mmd->pass_index,
                                       mmd->layer_pass,
-                                      4,
+                                      mmd->mode == GP_SIMPLIFY_SAMPLE ? 3 : 4,
                                       gpl,
                                       gps,
                                       mmd->flag & GP_SIMPLIFY_INVERT_LAYER,
@@ -75,14 +75,25 @@ static void deformStroke(GpencilModifierData *md,
     return;
   }
 
-  if (mmd->mode == GP_SIMPLIFY_FIXED) {
-    for (int i = 0; i < mmd->step; i++) {
-      BKE_gpencil_simplify_fixed(gps);
+  /* Select simplification mode. */
+  switch (mmd->mode) {
+    case GP_SIMPLIFY_FIXED: {
+      for (int i = 0; i < mmd->step; i++) {
+        BKE_gpencil_simplify_fixed(gps);
+      }
+      break;
     }
-  }
-  else {
-    /* simplify stroke using Ramer-Douglas-Peucker algorithm */
-    BKE_gpencil_simplify_stroke(gps, mmd->factor);
+    case GP_SIMPLIFY_ADAPTIVE: {
+      /* simplify stroke using Ramer-Douglas-Peucker algorithm */
+      BKE_gpencil_simplify_stroke(gps, mmd->factor);
+      break;
+    }
+    case GP_SIMPLIFY_SAMPLE: {
+      BKE_gpencil_sample_stroke(gps, mmd->length, false);
+      break;
+    }
+    default:
+      break;
   }
 }