EgtGeomKernel 1.5g2 :

- aggiunte intersezioni tra linee ed archi
- aggiunte intersezioni tra archi e archi
- aggiunte funzioni di utilità per angoli.

PolyLine.cpp

@@ -327,7 +327,7 @@ PolyLine::GetNextULine( double* pdIni, Point3d* pptIni, double* pdFin, Point3d*
 
 //----------------------------------------------------------------------------
 bool
-PolyLine::NewellPlane( Plane3d& plPlane) const
+PolyLine::NewellPlane( Plane3d& plPlane, double& dArea) const
 {
   // Compute normal as being proportional to projected areas of polygon onto the yz,
   // xz, and xy planes. Also compute centroid as representative point on the plane
@@ -356,21 +356,25 @@ PolyLine::NewellPlane( Plane3d& plPlane) const
    if ( nNumSide < 3)
       return false ;
   // Normal must be normalizable (the length of the normal is the double of the area of the polygon)
-   if ( ! vtN.Normalize())
+   double dLenN = vtN.Len() ;
+   if ( dLenN < EPS_SMALL)
       return false ;
-  // Normalize normal and fill in the plane equation fields
+   vtN /= dLenN ;
+  // Fill in the plane equation fields
    plPlane.vtN = vtN ;
    plPlane.dDist = ( ( ptCen - ORIG) * plPlane.vtN) / nNumSide ; // “centroid / n” is the true centroid point
+  // Set area
+   dArea = 0.5 * dLenN ;
 
    return true ;
 }
 
 //----------------------------------------------------------------------------
 bool
-PolyLine::IsPlanar( Plane3d& plPlane, double dToler) const
+PolyLine::IsPlanar( Plane3d& plPlane, double& dArea, double dToler) const
 {
   // Compute a representative plane for the polygon
-   if ( ! NewellPlane( plPlane))
+   if ( ! NewellPlane( plPlane, dArea))
       return false ;
   // Test each vertex to see if it is farther from plane than allowed max distance
    Point3d ptP ;
@@ -383,6 +387,23 @@ PolyLine::IsPlanar( Plane3d& plPlane, double dToler) const
    return true ;
 }
 
+//----------------------------------------------------------------------------
+bool
+PolyLine::GetAreaXY( double& dArea) const
+{
+  // verifico sia chiusa
+   if ( ! IsClosed())
+      return false ;
+  // calcolo l'area considerando solo XY (è la Z di Newell)
+   dArea = 0 ;
+   Point3d ptIni, ptFin ;
+   for ( bool bFound = GetFirstLine( ptIni, ptFin) ; bFound ; bFound = GetNextLine( ptIni, ptFin)) {
+      dArea += ( ptIni.x - ptFin.x) * ( ptIni.y + ptFin.y) ;   // projection on xy
+   }
+   dArea = 0.5 * dArea ;
+   return true ;
+}
+
 //----------------------------------------------------------------------------
 bool
 PolyLine::GetMaxDistanceFromLine( double& dMaxDist, const Point3d& ptAx,