From df12d6bab174d6f759bccd0a10527482e889e5db Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Tue, 12 May 2020 13:31:16 +1000
Subject: [PATCH] New feature to convert from local to global coordinates

---
 .../blenderbim/bim/__init__.py                |  1 +
 .../blenderbim/bim/operator.py                | 28 ++++++++++++++++++-
 src/ifcblenderexport/blenderbim/bim/ui.py     |  3 ++
 3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/src/ifcblenderexport/blenderbim/bim/__init__.py b/src/ifcblenderexport/blenderbim/bim/__init__.py
index 2c6d30a883..294683546d 100644
--- a/src/ifcblenderexport/blenderbim/bim/__init__.py
+++ b/src/ifcblenderexport/blenderbim/bim/__init__.py
@@ -127,6 +127,7 @@ if bpy is not None:
         operator.RemoveVariable,
         operator.PropagateTextData,
         operator.PushRepresentation,
+        operator.ConvertLocalToGlobal,
         prop.StrProperty,
         prop.Variable,
         prop.Classification,
diff --git a/src/ifcblenderexport/blenderbim/bim/operator.py b/src/ifcblenderexport/blenderbim/bim/operator.py
index 9cebac6e55..81fbeca274 100644
--- a/src/ifcblenderexport/blenderbim/bim/operator.py
+++ b/src/ifcblenderexport/blenderbim/bim/operator.py
@@ -18,7 +18,7 @@ from . import annotation
 from bpy_extras.io_utils import ImportHelper
 from itertools import cycle
 from mathutils import Vector, Matrix, Euler
-from math import radians, atan, tan
+from math import radians, atan, tan, cos, sin, atan2
 from pathlib import Path
 
 colour_list = [
@@ -2653,3 +2653,29 @@ class PushRepresentation(bpy.types.Operator):
         return element.ContextType == self.context \
             and element.ContextIdentifier == self.subcontext \
             and element.TargetView == self.target_view
+
+
+class ConvertLocalToGlobal(bpy.types.Operator):
+    bl_idname = 'bim.convert_local_to_global'
+    bl_label = 'Convert Local To Global'
+
+    def execute(self, context):
+        x, y, z = bpy.context.scene.cursor.location
+
+        if bpy.context.scene.MapConversion.scale:
+            scale = float(bpy.context.scene.MapConversion.scale)
+        else:
+            scale = 1.
+
+        rotation = atan2(
+            float(bpy.context.scene.MapConversion.x_axis_ordinate),
+            float(bpy.context.scene.MapConversion.x_axis_abscissa))
+        a = scale * cos(rotation)
+        b = scale * sin(rotation)
+
+        eastings = (a * x) - (b * y) + float(bpy.context.scene.MapConversion.eastings)
+        northings = (b * x) + (a * y) + float(bpy.context.scene.MapConversion.northings)
+        height = z + float(bpy.context.scene.MapConversion.orthogonal_height)
+
+        bpy.context.scene.cursor.location = (eastings, northings, height)
+        return {'FINISHED'}
diff --git a/src/ifcblenderexport/blenderbim/bim/ui.py b/src/ifcblenderexport/blenderbim/bim/ui.py
index 7227a75fe3..a4a156f8b7 100644
--- a/src/ifcblenderexport/blenderbim/bim/ui.py
+++ b/src/ifcblenderexport/blenderbim/bim/ui.py
@@ -535,6 +535,9 @@ class BIM_PT_gis(Panel):
         layout.row().prop(scene.TargetCRS, 'map_zone')
         layout.row().prop(scene.TargetCRS, 'map_unit')
 
+        row = layout.row(align=True)
+        row.operator('bim.convert_local_to_global')
+
 
 class BIM_PT_documentation(Panel):
     bl_label = "Documentation"