#ifndef CG_HEIGHTFIELD_H
#define CG_HEIGHTFIELD_H

#include "util.h"
#include "cgapplication.h"
#include <time.h>

// Ray Tracer Class
class CGRayTracer : public CGApplication {
public:

    // CGRayTracer, ~CGRayTracer
    CGRayTracer(unsigned int x, unsigned int y);
    virtual ~CGRayTracer();

    virtual void onInit();
    virtual void onDraw();        
    virtual void onIdle();
    virtual void onKey(unsigned char key);    
    virtual void onSize(unsigned int newWidth, unsigned int newHeight);
    
    // createImage
    void createImage(int width, int height);
    void writeImage(char* fileName);

	// use shadows
	bool shadows_;
	// max recursion depth
	int maxDepth_;
	int nTests_;

private:             
    // phongIlluminationColor
    Color phongIlluminationColor(
        const Vector& point, 
        const Vector& normal,
        Material* material);

    // writePPMPixel
    void writePPMPixel(const Color& c);

    // rayTrace
    Color rayTrace(const Ray& r, int nDepth=1);

	// add an object to the scene
	void AddObject(Shape* shape, Material* material);

    // shape and material array
    int shapeSize_;
    Shape** shape_;
    Material** material_;

    // light array
    int lightSize_;
    Light** light_;

    // camera
    Camera* camera_;

    // dimension of viewport
    int width_;
    int height_;

	// memory buffer
	unsigned int imagex_, imagey_;
	Color* image_;
	int detail_;
	bool antialias_;

    // file
    ofstream* out_;

	// timer
	clock_t start_;
};

#endif // CG_HeightField_H