Added GetLineIntersection

Author: gtalarico

0-python-code/HowTo_GetLineIntersection.py

@@ -0,0 +1,66 @@
+"""
+Get Line Intersection
+Get's intersection of 2 lines
+
+TESTED REVIT API: 2017
+
+Author: Gui Talarico | github.com/gtalarico
+
+This file is shared on www.revitapidocs.com
+For more information visit http://github.com/gtalarico/revitapidocs
+License: http://github.com/gtalarico/revitapidocs/blob/master/LICENSE.md
+"""
+
+import clr
+from Autodesk.Revit.DB import Line, XYZ
+from Autodesk.Revit.DB import SetComparisonResult, IntersectionResultArray
+
+def get_intersection(line1, line2):
+	results = clr.Reference[IntersectionResultArray]()
+    # See ironpython.net/documentation/dotnet for clr.Reference
+
+	result = line1.Intersect(line2, results)
+    # http://www.revitapidocs.com/2018/51961478-fb36-e00b-2d1b-7db27b0a09e6.htm
+
+	if result != SetComparisonResult.Overlap:
+		print('No Intesection')
+
+	intersection = results.Item[0]
+	return intersection.XYZPoint
+
+
+line1 = Line.CreateBound(XYZ(0,0,0), XYZ(10,0,0))
+line2 = Line.CreateBound(XYZ(5,-5,0), XYZ(5,5,0))
+point = get_intersection(line1, line2)
+print(point)
+# <Autodesk.Revit.DB.XYZ object at 0x00000000000001BA [(5.000000000, 0.000000000, 0.000000000)]>
+
+"""
+From this discussion:
+https://forum.dynamobim.com/t/translating-to-python/13481
+
+C# Equivalent
+
+private XYZ GetIntersection(
+  Line line1,
+  Line line2 )
+{
+  IntersectionResultArray results;
+
+  SetComparisonResult result
+    = line1.Intersect( line2, out results );
+
+  if( result != SetComparisonResult.Overlap )
+    throw new InvalidOperationException(
+      "Input lines did not intersect." );
+
+  if( results == null || results.Size != 1 )
+    throw new InvalidOperationException(
+      "Could not extract line intersection point." );
+
+  IntersectionResult iResult
+    = results.get_Item( 0 );
+
+  return iResult.XYZPoint;
+}
+"""