1 files changed, 103 insertions, 0 deletions
diff --git a/mesh_tiny_cad/BIX.py b/mesh_tiny_cad/BIX.py
new file mode 100644
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+++ b/mesh_tiny_cad/BIX.py
@@ -0,0 +1,103 @@
+# ##### 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 #####
+
+# <pep8 compliant>
+
+
+import bpy
+import bmesh
+from . import cad_module as cm
+
+
+def add_line_to_bisection(self):
+
+    obj = bpy.context.object
+    me = obj.data
+    bm = bmesh.from_edit_mesh(me)
+
+    if hasattr(bm.verts, "ensure_lookup_table"):
+        bm.verts.ensure_lookup_table()
+        bm.edges.ensure_lookup_table()
+
+    edges = [e for e in bm.edges if e.select and not e.hide]
+
+    if not len(edges) == 2:
+        msg = "select two coplanar non parallel edges"
+        self.report({"WARNING"}, msg)
+        return
+
+    [[v1, v2], [v3, v4]] = [[v.co for v in e.verts] for e in edges]
+    print('vectors found:\n', v1, '\n', v2, '\n', v3, '\n', v4)
+
+    dist1 = (v1 - v2).length
+    dist2 = (v3 - v4).length
+    bdist = min([dist1, dist2])
+    edge1 = (v1, v2)
+    edge2 = (v3, v4)
+
+    if not cm.test_coplanar(edge1, edge2):
+        msg = "edges must be coplanar non parallel edges"
+        self.report({"WARNING"}, msg)
+        return
+
+    # get pt and pick fartest vertex from (projected) intersections
+    pt = cm.get_intersection(edge1, edge2)
+    far1 = v2 if (v1 - pt).length < (v2 - pt).length else v1
+    far2 = v4 if (v3 - pt).length < (v4 - pt).length else v3
+    # print('intersection: ', pt)
+
+    dex1 = far1 - pt
+    dex2 = far2 - pt
+    dex1 = dex1 * (bdist / dex1.length)
+    dex2 = dex2 * (bdist / dex2.length)
+    pt2 = pt + (dex1).lerp(dex2, 0.5)
+    # print('bisector point:', pt2)
+
+    pt3 = pt2.lerp(pt, 2.0)
+
+    vec1 = bm.verts.new(pt2)
+    vec2 = bm.verts.new(pt)
+    vec3 = bm.verts.new(pt3)
+    bm.edges.new((vec1, vec2))
+    bm.edges.new((vec2, vec3))
+    bmesh.update_edit_mesh(me)
+    # print("done")
+
+
+class TCLineOnBisection(bpy.types.Operator):
+    '''Generate the bisector of two selected edges'''
+    bl_idname = 'tinycad.linetobisect'
+    bl_label = 'BIX line to bisector'
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        obj = context.active_object
+        return all([obj is not None, obj.type == 'MESH', obj.mode == 'EDIT'])
+
+    def execute(self, context):
+        add_line_to_bisection(self)
+        return {'FINISHED'}
+
+
+def register():
+    bpy.utils.register_module(__name__)
+
+
+def unregister():
+    bpy.utils.unregister_module(__name__)