geometry.h

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#ifndef __GEOMETRY_H__
#define __GEOMETRY_H__

#include <unordered_map>

class Geometry {
public:
    virtual ~Geometry() {}
    
    virtual bool operator()(double x, double y, double z) const=0; 
    
    virtual void getBoundingBox(double& xmin, double& xmax, double& ymin, double& ymax, double& zmin, double& zmax)=0;
    
};









class Ball: public Geometry {
public:
    Ball();
    
    virtual ~Ball() {}
    
    virtual bool operator()(double x, double y, double z) const;
    
    virtual void getBoundingBox(double& xmin, double& xmax, double& ymin, double& ymax, double& zmin, double& zmax);    
private:
    double radius; 
    double xCen; 
    double yCen; 
    double zCen; 
};









class Disk: public Geometry {
public:
    Disk();
    
    virtual ~Disk() {}
    
    virtual bool operator()(double x, double y, double z) const;    
    
    virtual void getBoundingBox(double& xmin, double& xmax, double& ymin, double& ymax, double& zmin, double& zmax);    
private:
    double radius; 
    double xCen; 
    double yCen; 
};











class GeometryFactory {
public:
    typedef Geometry* (*GeoCreateFunc)();
    
    static GeometryFactory& instance(); 
    
    void registerGeometry(std::string name, GeoCreateFunc func);
    
    Geometry* createGeometry(std::string name);
private:
    std::unordered_map<std::string,GeoCreateFunc> geoTable; 
    GeometryFactory() {} 
    GeometryFactory(const GeometryFactory& other); 
    GeometryFactory& operator=(const GeometryFactory& other); 
};


#endif // __GEOMETRY_H__