1 files changed, 152 insertions, 0 deletions
diff --git a/uv_magic_uv/muv_mirroruv_ops.py b/uv_magic_uv/muv_mirroruv_ops.py
new file mode 100644
index 00000000..d0a98b87
--- /dev/null
+++ b/uv_magic_uv/muv_mirroruv_ops.py
@@ -0,0 +1,152 @@
+# <pep8-80 compliant>
+
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+__author__ = "Keith (Wahooney) Boshoff, Nutti <nutti.metro@gmail.com>"
+__status__ = "production"
+__version__ = "4.3"
+__date__ = "1 Apr 2017"
+
+
+import bpy
+from bpy.props import EnumProperty, FloatProperty
+import bmesh
+from mathutils import Vector
+from . import muv_common
+
+
+class MUV_MirrorUV(bpy.types.Operator):
+    """
+    Operation class: Mirror UV
+    """
+
+    bl_idname = "uv.muv_mirror_uv"
+    bl_label = "Mirror UV"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    axis = EnumProperty(
+        items=(
+            ('X', "X", "Mirror Along X axis"),
+            ('Y', "Y", "Mirror Along Y axis"),
+            ('Z', "Z", "Mirror Along Z axis")
+        ),
+        name="Axis",
+        description="Mirror Axis",
+        default='X'
+    )
+    error = FloatProperty(
+        name="Error",
+        description="Error threshold",
+        default=0.001,
+        min=0.0,
+        max=100.0,
+        soft_min=0.0,
+        soft_max=1.0
+    )
+
+    def __is_vector_similar(self, v1, v2, error):
+        """
+        Check if two vectors are similar, within an error threshold
+        """
+        within_err_x = abs(v2.x - v1.x) < error
+        within_err_y = abs(v2.y - v1.y) < error
+        within_err_z = abs(v2.z - v1.z) < error
+
+        return within_err_x and within_err_y and within_err_z
+
+    def __mirror_uvs(self, uv_layer, src, dst, axis, error):
+        """
+        Copy UV coordinates from one UV face to another
+        """
+        for sl in src.loops:
+            suv = sl[uv_layer].uv.copy()
+            svco = sl.vert.co.copy()
+            for dl in dst.loops:
+                dvco = dl.vert.co.copy()
+                if axis == 'X':
+                    dvco.x = -dvco.x
+                elif axis == 'Y':
+                    dvco.y = -dvco.y
+                elif axis == 'Z':
+                    dvco.z = -dvco.z
+
+                if self.__is_vector_similar(svco, dvco, error):
+                    dl[uv_layer].uv = suv.copy()
+
+    def __get_face_center(self, face):
+        """
+        Get center coordinate of the face
+        """
+        center = Vector((0.0, 0.0, 0.0))
+        for v in face.verts:
+            center = center + v.co
+
+        return center / len(face.verts)
+
+    @classmethod
+    def poll(cls, context):
+        obj = context.active_object
+        return obj and obj.type == 'MESH'
+
+    def execute(self, context):
+        obj = context.active_object
+        bm = bmesh.from_edit_mesh(obj.data)
+
+        error = self.error
+        axis = self.axis
+
+        if muv_common.check_version(2, 73, 0) >= 0:
+            bm.faces.ensure_lookup_table()
+        if not bm.loops.layers.uv:
+            self.report({'WARNING'}, "Object must have more than one UV map")
+            return {'CANCELLED'}
+        uv_layer = bm.loops.layers.uv.verify()
+
+        faces = [f for f in bm.faces if f.select]
+        for f_dst in faces:
+            count = len(f_dst.verts)
+            for f_src in bm.faces:
+                # check if this is a candidate to do mirror UV
+                if f_src.index == f_dst.index:
+                    continue
+                if count != len(f_src.verts):
+                    continue
+
+                # test if the vertices x values are the same sign
+                dst = self.__get_face_center(f_dst)
+                src = self.__get_face_center(f_src)
+                if (dst.x > 0 and src.x > 0) or (dst.x < 0 and src.x < 0):
+                    continue
+
+                # invert source axis
+                if axis == 'X':
+                    src.x = -src.x
+                elif axis == 'Y':
+                    src.y = -src.z
+                elif axis == 'Z':
+                    src.z = -src.z
+
+                # do mirror UV
+                if self.__is_vector_similar(dst, src, error):
+                    self.__mirror_uvs(
+                        uv_layer, f_src, f_dst, self.axis, self.error)
+
+        bmesh.update_edit_mesh(obj.data)
+
+        return {'FINISHED'}