HLRBRep_PolyAlgo.hxx File Reference

#include <Standard.hxx>
#include <Standard_DefineHandle.hxx>
#include <Handle_HLRBRep_PolyAlgo.hxx>
#include <HLRAlgo_Projector.hxx>
#include <Standard_Real.hxx>
#include <TopTools_SequenceOfShape.hxx>
#include <TopTools_IndexedMapOfShape.hxx>
#include <Handle_HLRAlgo_PolyAlgo.hxx>
#include <Standard_Integer.hxx>
#include <Standard_Boolean.hxx>
#include <Handle_Geom_Surface.hxx>
#include <BRepAdaptor_Surface.hxx>
#include <BRepAdaptor_Curve.hxx>
#include <BRepAdaptor_Curve2d.hxx>
#include <MMgt_TShared.hxx>
#include <Standard_Address.hxx>
#include <Handle_HLRAlgo_PolyInternalData.hxx>
#include <GeomAbs_Shape.hxx>
#include <HLRBRep_PolyAlgo.lxx>
#include <Handle_TColStd_HArray1OfTransient.hxx>
#include <Standard_Macro.hxx>
#include <Handle_HLRAlgo_ListNodeOfListOfBPoint.hxx>
#include <TCollection_ListIterator.lxx>
#include <TColStd_Array1OfTransient.hxx>
#include <Handle_Standard_Transient.hxx>
#include <TCollection_HArray1.lxx>

Data Structures
class	HLRBRep_PolyAlgo
	A framework to compute the shape as seen in a projection plane. This is done by calculating the visible and the hidden parts of the shape. HLRBRep_PolyAlgo works with three types of entity: shapes to be visualized (these shapes must have already been triangulated.) edges in these shapes (these edges are defined as polygonal lines on the triangulation of the shape, and are the basic entities which will be visualized or hidden), and triangles in these shapes which hide the edges. HLRBRep_PolyAlgo is based on the principle of comparing each edge of the shape to be visualized with each of the triangles produced by the triangulation of the shape, and calculating the visible and the hidden parts of each edge. For a given projection, HLRBRep_PolyAlgo calculates a set of lines characteristic of the object being represented. It is also used in conjunction with the HLRBRep_PolyHLRToShape extraction utilities, which reconstruct a new, simplified shape from a selection of calculation results. This new shape is made up of edges, which represent the shape visualized in the projection. HLRBRep_PolyAlgo works with a polyhedral simplification of the shape whereas HLRBRep_Algo takes the shape itself into account. When you use HLRBRep_Algo, you obtain an exact result, whereas, when you use HLRBRep_PolyAlgo, you reduce computation time but obtain polygonal segments. An HLRBRep_PolyAlgo object provides a framework for: defining the point of view identifying the shape or shapes to be visualized calculating the outlines calculating the visible and hidden lines of the shape. Warning Superimposed lines are not eliminated by this algorithm. There must be no unfinished objects inside the shape you wish to visualize. Points are not treated. Note that this is not the sort of algorithm used in generating shading, which calculates the visible and hidden parts of each face in a shape to be visualized by comparing each face in the shape with every other face in the same shape. More...