Consolidate Section logic in DrawViewSection

src/Mod/TechDraw/App/DrawViewSection.cpp

@@ -74,6 +74,7 @@
 #include "Geometry.h"
 #include "GeometryObject.h"
 #include "EdgeWalker.h"
+#include "DrawUtil.h"
 #include "DrawProjectSplit.h"
 #include "DrawViewSection.h"
 
@@ -449,6 +450,50 @@ bool DrawViewSection::isReallyInBox (const Base::Vector3d v, const Base::BoundBo
     return true;
 }
 
+//! calculate the section Normal/Projection Direction given baseView projection direction and section name
+/*static*/
+Base::Vector3d DrawViewSection::getSectionVector (const Base::Vector3d baseViewDir, const std::string sectionName)
+{
+    Base::Vector3d result;
+    Base::Vector3d stdX(1.0,0.0,0.0);
+    Base::Vector3d stdY(0.0,1.0,0.0);
+    Base::Vector3d stdZ(0.0,0.0,1.0);
+    Base::Vector3d view = baseViewDir;
+    view.Normalize();
+    Base::Vector3d left = view.Cross(stdZ);
+    left.Normalize();    //redundent?
+    Base::Vector3d down = view.Cross(left);
+    down.Normalize();    //redundent?
+    double dot = view.Dot(stdZ);
+
+    if (sectionName == "Up") {
+        result = down;
+        if (DrawUtil::fpCompare(fabs(dot),1.0)) {
+            result  = (-1.0 * stdY);
+        }
+    } else if (sectionName == "Down") {
+        result = down * -1.0;
+        if (DrawUtil::fpCompare(fabs(dot),1.0)) {
+            result = stdY;
+        }
+    } else if (sectionName == "Left") {
+        result = left * -1.0;
+        if (DrawUtil::fpCompare(fabs(dot),1.0)) {
+            result = stdX;
+        }
+    } else if (sectionName == "Right") {
+        result = left;
+        if (DrawUtil::fpCompare(fabs(dot),1.0)) {
+            result = -1.0 * stdX;
+        }
+    } else {
+        Base::Console().Log("Error - DVS::getSectionVector - bad sectionName: %s\n",sectionName.c_str());
+        result = stdZ;
+    }
+    
+    return result;
+}
+
 void DrawViewSection::getParameters()
 {
     Base::Reference<ParameterGrp> hGrp = App::GetApplication().GetUserParameter()