From 906f9962bc8de6a328274876696752931e4ba931 Mon Sep 17 00:00:00 2001
From: Jacob Morris <blendingjake@gmail.com>
Date: Wed, 16 Jan 2019 08:16:56 -0500
Subject: [PATCH] added roof mirroring

---
 jv_builder_base.py | 19 +++++++++++++++++++
 jv_properties.py   |  6 +++++-
 jv_roofing.py      | 15 +++++++++++++--
 3 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/jv_builder_base.py b/jv_builder_base.py
index a84de82..c07e82e 100644
--- a/jv_builder_base.py
+++ b/jv_builder_base.py
@@ -524,3 +524,22 @@ def _mortar_geometry(props, dims: tuple):
         faces = [(0, 3, 2, 1)]
 
         return verts, faces
+
+    @staticmethod
+    def _mirror(mesh, axis='X'):
+        """
+        Duplicate and mirror existing geometry across the specified axis
+        :param mesh: the mesh to duplicate and mirror
+        :param axis: the axis to mirror across, must be in {'X', 'Y', 'Z'}
+        :return:
+        """
+        # duplicate geometry
+        new_geom = bmesh.ops.duplicate(mesh, geom=mesh.verts[:] + mesh.edges[:] + mesh.faces[:])["geom"]
+
+        i = {'X': 1, 'Y': 0, 'Z': 2}[axis.upper()]
+        for item in new_geom:
+            if isinstance(item, bmesh.types.BMVert):
+                item.co[i] *= -1
+
+        mesh.verts.ensure_lookup_table()
+        mesh.faces.ensure_lookup_table()
diff --git a/jv_properties.py b/jv_properties.py
index 1bcaafa..7e14151 100644
--- a/jv_properties.py
+++ b/jv_properties.py
@@ -112,7 +112,7 @@ class Cutout(PropertyGroup):
     )
 
     local: BoolProperty(
-        name="Local Coordinates?", default=False,
+        name="Local Coordinates?", default=True,
         description="Are offset and rotation values in reference to the object's origin?",
         update=jv_on_property_update
     )
@@ -547,6 +547,10 @@ class JVProperties(PropertyGroup):
         description="The distance between the half-circles on the tiles", update=jv_on_property_update
     )
 
+    mirror: BoolProperty(
+        name="Mirror?", default=False, description="Mirror roofing across X-axis?", update=jv_on_property_update
+    )
+
     # WINDOW SPECIFIC --------------------------------------------------------------------------
     jamb_width: FloatProperty(
         name="Jamb Width",
diff --git a/jv_roofing.py b/jv_roofing.py
index b713cde..7a7d515 100644
--- a/jv_roofing.py
+++ b/jv_roofing.py
@@ -12,7 +12,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from . jv_builder_base import JVBuilderBase
-from mathutils import Euler
+from mathutils import Euler, Vector
 from math import atan, cos, radians, sin, asin
 from . jv_utils import Units
 
@@ -76,6 +76,11 @@ def draw(props, layout):
             layout.separator()
             layout.prop(props, "gap_uniform")
 
+        # mirror
+        if props.convert_source_object is None:
+            layout.separator()
+            layout.prop(props, "mirror", icon="MOD_MIRROR")
+
     @staticmethod
     def update(props, context):
         if props.convert_source_object is not None:
@@ -102,7 +107,13 @@ def update(props, context):
             rotation = Euler((rot, 0, 0))
             JVRoofing._rotate_mesh_vertices(mesh, rotation)
 
-            # TODO: mirror
+            # mirror
+            if props.mirror:
+                shift = Vector((0, -props.width, 0))
+                for v in mesh.verts:
+                    v.co += shift
+
+                JVRoofing._mirror(mesh)
 
         # cutouts
         if props.add_cutouts: