loop in and out

__init__.py

@@ -242,6 +242,18 @@ class ABC3D_text_properties(bpy.types.PropertyGroup):
         name="Ignore Curve Orientation",
         default=False,
     )
+    loop_in: bpy.props.BoolProperty(
+        update=update_callback,
+        name="Loop In",
+        description="Loop letter on curve if negative offset would place it in front of it.",
+        default=False,
+    )
+    loop_out: bpy.props.BoolProperty(
+        update=update_callback,
+        name="Loop Out",
+        description="Loop letter on curve if a large offset would place it behind it.",
+        default=False,
+    )
     distribution_type: bpy.props.StringProperty()
     glyphs: bpy.props.CollectionProperty(type=ABC3D_glyph_properties)
 
@@ -724,7 +736,7 @@ class ABC3D_PT_TextPropertiesPanel(bpy.types.Panel):
             if f"{utils.prefix()}_linked_textobject" in a_o:
                 text_index = a_o[f"{utils.prefix()}_linked_textobject"]
                 return bpy.context.scene.abc3d_data.available_texts[text_index]
-            elif f"{utils.prefix()}_linked_textobject" in a_o.parent:
+            elif a_o.parent is not None and f"{utils.prefix()}_linked_textobject" in a_o.parent:
                 text_index = a_o.parent[f"{utils.prefix()}_linked_textobject"]
                 return bpy.context.scene.abc3d_data.available_texts[text_index]
             else:
@@ -809,6 +821,8 @@ class ABC3D_PT_TextPropertiesPanel(bpy.types.Panel):
         layout.row().prop(props, "offset")
         layout.row().prop(props, "compensate_curvature")
         layout.row().prop(props, "ignore_orientation")
+        layout.row().prop(props, "loop_in")
+        layout.row().prop(props, "loop_out")
         layout.column().prop(props, "translation")
         layout.column().prop(props, "orientation")
 

butils.py

@@ -820,11 +820,12 @@ def update_matrices(obj):
 def is_or_has_parent(o, parent, if_is_parent=True, max_depth=10):
     if o == parent and if_is_parent:
         return True
+    oo = o
     for i in range(0, max_depth):
-        o = o.parent
-        if o == parent:
+        oo = oo.parent
+        if oo == parent:
             return True
-        if o is None:
+        if oo is None:
             return False
     return False
 
@@ -1013,11 +1014,21 @@ def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4)
         glyph_pre_advance, glyph_post_advance = get_glyph_prepost_advances(glyph)
         advance += glyph_pre_advance * scalor
 
+        # check if we want to loop
+        applied_advance = advance
+        if text_properties.loop_in:
+            if applied_advance < 0:
+                applied_advance %= curve_length
+
+        if text_properties.loop_out:
+            if applied_advance > curve_length:
+                applied_advance %= curve_length
+
         if distribution_type == "FOLLOW_PATH":
             outer_node.constraints.new(type="FOLLOW_PATH")
             outer_node.constraints["Follow Path"].target = mom
             outer_node.constraints["Follow Path"].use_fixed_location = True
-            outer_node.constraints["Follow Path"].offset_factor = advance / curve_length
+            outer_node.constraints["Follow Path"].offset_factor = applied_advance / curve_length
             outer_node.constraints["Follow Path"].use_curve_follow = True
             outer_node.constraints["Follow Path"].forward_axis = "FORWARD_X"
             outer_node.constraints["Follow Path"].up_axis = "UP_Y"
@@ -1033,7 +1044,7 @@ def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4)
                 previous_inner_node_rotation_mode = inner_node.rotation_mode
 
             # get info from bezier
-            location, tangent, spline_index = calc_point_on_bezier_curve(mom, advance, True, True)
+            location, tangent, spline_index = calc_point_on_bezier_curve(mom, applied_advance, True, True)
 
             # check if we are on a new line
             if spline_index != previous_spline_index:
@@ -1073,7 +1084,6 @@ def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4)
 
         ############### PREPARE FOR THE NEXT
 
-        print(f"{glyph_id}: {glyph_properties.letter_spacing=}")
         glyph_advance = (
             glyph_post_advance * scalor + text_properties.letter_spacing + glyph_properties.letter_spacing
         )