common.h

file code.zip are used to implement ray tracing technology.

#ifndef _COMMON_H
#define _COMMON_H

#include <stdlib.h>
#include <gl/glut.h>


// C output
#include <stdio.h>

// Math functions
#include <math.h>

#define min(X, Y)   X<Y?X:Y

// Should be in Math.h but Visual C++ omits it ... for some reason ...
#define M_PI 3.1415926
// C++ Output
#include <iostream>
using namespace std;

// Ansi Assertions
#include <assert.h>

//@@@@@@@@@@@@@@@@@@ IntPoint class @@@@@@@@@@@@@@@@
class IntPoint
{ // for 2D points with integer coordinates
public:
    int x,y;

    void set(int dx, int dy);
    void set(IntPoint& p);

    IntPoint(int xx, int yy);
    IntPoint();
};

class Point2   //single point w/ floating point coordinates
{
public:
    Point2();
    Point2(float xx, float yy);

    void set(float xx, float yy);
    float getX();
    float getY();

    void draw();

private:
    float x, y;
};


//@@@@@@@@@@@@@@@@@@ Point3 class @@@@@@@@@@@@@@@@
class Point3
{
public:
    float x,y,z,h;

    Point3(float xx, float yy, float zz);
    Point3();

    void set(float dx, float dy, float dz);
    void set(Point3& p);

    void build4tuple(float v[]);
};
class IntRect  //aligned rectangle with integer coordinates, used for viewport
{
public:
    IntRect();
    IntRect(int left, int right, int bottom, int top);

    void set(int left, int right, int bottom, int top);

    void draw();

    int getL();
    int getR();
    int getT();
    int getB();

public:
    int l, r, b, t;
};

class RealRect   //simlar to IntRect but w/ floating points & used for world window
{
public:
    RealRect();
    RealRect(float left, float right, float bottom, float top);
    void set(float left, float right, float bottom, float top);

    void draw(void);

    float getL(void);
    float getR(void);
    float getT(void);
    float getB(void);

private:
    float l, r, b, t;
};


// @@@@@@@@@@@@@@@@@@@@@ Color3 class @@@@@@@@@@@@@@@@
class Color3
{
public:
    float red, green, blue;

    Color3();
//    Color3(Color3& c);
    Color3(float r, float g, float b);

    void make(Color3 c);
    void set(Color3& c);
    void set(float r, float g, float b);

    void scale(float l);
    void build4tuple(float v[]);
//    void clamp();	//<-- Removed in favor of tone mapping
    bool isZero();
    
    void add(float r, float g, float b);
    void add(Color3& src, Color3& refl);
    void add(Color3& colr);
};

//@@@@@@@@@@@@@@@@@@ Vector3 class @@@@@@@@@@@@@@@@
class Vector3
{
public:
    float x,y,z;

    Vector3(float xx, float yy, float zz);
//    Vector3(Vector3& v);
    Vector3();

    void set(float dx, float dy, float dz);
    void set(Vector3 v);
    void setDiff(Point3& a, Point3& b);
    
    void flip();
    void normalize();
    double length();

    Vector3 cross(Vector3 b);
    float dot(Vector3 b);
    void add(Vector3 a);
    void scale(float a);
    void rotate(float angle, Vector3 axis);
    void build4tuple(float v[]);
};

//@@@@@@@@@@@@@@@@@@@ PointCluster class @@@@@@@@@@@@@@@@@@
class PointCluster
{
public: // holds array of points for the bounding hull of a shape
    int num;
    Point3* pt;
    PointCluster();
    PointCluster(int n);
};

#endif