source: trunk/VUT/GtpVisibilityPreprocessor/src/Polygon3.h @ 321

#ifndef _Polygon3_h__
#define _Polygon3_h__


//#include <iostream>
//#include <math.h>
//#include "common.h"
#include "Containers.h"
#include "Mesh.h"
#include <iomanip>

class Polygon3;
class Plane3;
class Face;
class Intersectable;
class AxisAlignedBox3;
class Ray;
//typedef Vertex3 Vector3;

/** Class representing a planar convex polygon in 3d.
*/
class Polygon3
{
public:
        Polygon3();
        Polygon3(const VertexContainer &vertices);
        Polygon3(MeshInstance *parent);
        // creates an "infinite" polygon from this plane
        //Polygon3(Plane3 plane);
        /** Copies all the vertices of the face.
        */
        Polygon3(Face *face, Mesh *parentMesh);
        
        /** Returns supporting plane of this polygon.
        */
        Plane3 GetSupportingPlane() const;

        /** Splits polygon.
                @param partition the split plane
                @param front returns the front the front polygon
                @param back returns the back polygon
                @param splitPts returns the split points
        */
        void Polygon3::Split(const Plane3 &partition, 
                                                 Polygon3 &front, 
                                                 Polygon3 &back, 
                                                 VertexContainer &splitPts);

        /** Returns the area of this polygon.
        */
        float GetArea() const;

        enum {BACK_SIDE, FRONT_SIDE, SPLIT, COINCIDENT};

        /** Classify polygon with respect to the plane.
            @returns one of BACK_SIDE, FRONT_SIDE, SPLIT, COINCIDENT
        */
        int ClassifyPlane(const Plane3 &plane) const;

        /** Side of the polygon with respect to the plane.
                @returns 1 if on front side, -1 if on back side, 0 else.
        */
        int Side(const Plane3 &plane) const;

        /** Scales the polygon about its center
        */
        void Scale(const float scale);
        
        /** Computes the center of mass of the polygon
         */
        Vector3 Center() const;
        /** Checks if the polygon is valid, i.e., not degenerated.
                @returns true if polygon is valid.
        */
        bool Valid() const; 

        /** Returns the surface normal.
        */
        inline Vector3 GetNormal() const;

        /** Includes polygons to axis aligned box.
        */
        static void IncludeInBox(const PolygonContainer &polys, AxisAlignedBox3 &box);

        /** Casts ray to polygon.
        */
        int CastRay(const Ray &ray, float &t, const float nearestT);

        /** Returns piercing rays container.
        */
        RayContainer *GetPiercingRays();

        /** Adds a ray to the ray container.
        */
        void AddPiercingRay(Ray *ray);

        /// vertices are connected in counterclockwise order.
        VertexContainer mVertices;

        /// we can also store materials with polygons
        Material *mMaterial;
        
        /// pointer to the mesh instance this polygon is derived from
        MeshInstance *mParent;

        /// Rays piercing this polygon
        RayContainer *mPiercingRays;
};

// Overload << operator for C++-style output
inline ostream&
operator<< (ostream &s, const Polygon3 &A)
{
        VertexContainer::const_iterator it;

        //s << setprecision(6) << "Polygon:\n";
        for (it = A.mVertices.begin(); it != A.mVertices.end(); ++it)
                s << *it << endl;
        
        return s;
}


#endif