source: cpp/gdk/3d.h @ 81

// This file is a part of the Framsticks GDK library.
// Copyright (C) 2002-2011  Szymon Ulatowski.  See LICENSE.txt for details.
// Refer to http://www.framsticks.com/ for further information.

#ifndef _3D_H_
#define _3D_H_

#ifdef SHP
#include <string.h> //memcpy
#else
#include <memory.h> //memcpy
#endif

/**********************************
\file 3d.h 3d.cpp

   basic 3d classes and operators     
*********************************/

/// point in 3d space

class Pt3D
{
public: double x,y,z;
static bool report_errors;

Pt3D(double _x,double _y,double _z):x(_x),y(_y),z(_z) {} ///< constructor initializing all coords
Pt3D(double xyz):x(xyz),y(xyz),z(xyz) {} ///< all coords equal 
Pt3D() {} ///< coords will be not initialized!
Pt3D(const Pt3D &p):x(p.x),y(p.y),z(p.z) {} ///< copy from another point
bool    operator==(const Pt3D& p)       {return (x==p.x)&&(y==p.y)&&(z==p.z);}
void    operator+=(const Pt3D& p)       {x+=p.x;y+=p.y;z+=p.z;}
void    operator-=(const Pt3D& p)       {x-=p.x;y-=p.y;z-=p.z;}
void    operator*=(double d)    {x*=d;y*=d;z*=d;}
Pt3D    operator*(const Pt3D &p) const {return Pt3D(y*p.z-z*p.y, z*p.x-x*p.z, x*p.y-y*p.x);}
void    operator/=(double d)    {x/=d; y/=d; z/=d;}
//Pt3D  operator+(const Pt3D& p) const {return Pt3D(x+p.x,y+p.y,z+p.z);}
//Pt3D  operator-(const Pt3D& p) const {return Pt3D(x-p.x,y-p.y,z-p.z);}
Pt3D    operator-() const {return Pt3D(-x,-y,-z);}
Pt3D    operator*(double d) const {return Pt3D(x*d,y*d,z*d);}
Pt3D    operator/(double d) const {return Pt3D(x/d,y/d,z/d);}
int     operator<(const Pt3D& p) const {return (x<p.x)&&(y<p.y)&&(z<p.z);}
        ///< check if all coords are below the second point
int     operator>(const Pt3D& p) const {return (x>p.x)&&(y>p.y)&&(z>p.z);}
        ///< check if all coords are above the second point
int     operator<=(const Pt3D& p) const {return (x<p.x)||(y<p.y)||(z<p.z);}
        ///< check if some coords are below the second point
int     operator>=(const Pt3D& p) const {return (x>p.x)||(y>p.y)||(z>p.z);}
        ///< check if some coords are above the second point
void getMin(const Pt3D& p);
void getMax(const Pt3D& p);
/** vector length = \f$\sqrt{x^2+y^2+z^2}\f$  */
double operator()() const;
/** vector length = \f$\sqrt{x^2+y^2+z^2}\f$  */
double length() const {return operator()();}
double length2() const {return x*x+y*y+z*z;}
double distanceTo(const Pt3D& p) const;
double manhattanDistanceTo(const Pt3D& p) const;
/** calculate angle between (0,0)-(dx,dy), @return 1=ok, 0=can't calculate */
static int getAngle(double dx,double dy,double &angle);
/** calculate 3 rotation angles translating (1,0,0) into 'X' and (0,0,1) into 'dir' */
void getAngles(const Pt3D& X,const Pt3D& dir);
void vectorProduct(const Pt3D& a,const Pt3D& b);
bool normalize();
};
Pt3D operator+(const Pt3D &p1,const Pt3D &p2);
Pt3D operator-(const Pt3D &p1,const Pt3D &p2);

class Pt3D_DontReportErrors
{
bool state;
public:
Pt3D_DontReportErrors() {state=Pt3D::report_errors; Pt3D::report_errors=false;}
~Pt3D_DontReportErrors() {Pt3D::report_errors=state;}
};

///  orientation in 3d space = rotation matrix

class Matrix44;

class Orient
{
public: Pt3D x,y,z; ///< 3 vectors (= 3x3 matrix)

        Orient() {}
        Orient(const Orient& src) {x=src.x; y=src.y; z=src.z;}
        Orient(const Pt3D& a,const Pt3D& b,const Pt3D& c):x(a),y(b),z(c) {}
//      Orient(const Pt3D& rot) {*this=rot;}
        Orient(const Matrix44& m);
        void operator=(const Pt3D &rot);
        void rotate(const Pt3D &); ///< rotate matrix around 3 axes

        void transform(Pt3D &target,const Pt3D &src) const;     ///< transform a vector
        void revTransform(Pt3D &target,const Pt3D &src) const;  ///< reverse transform
        Pt3D transform(const Pt3D &src) const {Pt3D t; transform(t,src); return t;}
        Pt3D revTransform(const Pt3D &src) const {Pt3D t; revTransform(t,src); return t;}

        void transform(Orient& target,const Orient& src) const;    ///< transform other orient
        void revTransform(Orient& target,const Orient& src) const; ///< reverse transform other orient

        void transform(const Orient &rot) {Orient tmp; rot.transform(tmp,*this); *this=tmp;}
        void revTransform(const Orient &rot) {Orient tmp; rot.revTransform(tmp,*this); *this=tmp;}

        void getAngles(Pt3D &) const; ///< calculate rotation from current matrix
        void lookAt(const Pt3D &X,const Pt3D &dir); ///< calculate orientation matrix from 2 vectors

        bool normalize();
};

class Matrix44
{
public:
double m[16];
Matrix44() {}
Matrix44(const Matrix44& src) {memcpy(m,src.m,sizeof(m));}
Matrix44(double *srcm) {memcpy(m,srcm,sizeof(m));}
Matrix44(const Orient &rot);

const double& operator()(int i,int j) const {return m[i+16*j];}
const double& operator[](int i) const {return m[i];}
double& operator()(int i,int j) {return m[i+16*j];}
double& operator[](int i) {return m[i];}

void operator+=(const Pt3D &); ///< translate matrix
void operator*=(const Pt3D &); ///< scale matrix
void operator*=(double sc); ///< scale matrix
};

extern Pt3D Pt3D_0; ///< zero vector
extern Orient Orient_1; ///< standard unit matrix: 100 010 001
extern Matrix44 Matrix44_1; ///< standard unit matrix: 1000 0100 0010 0001

void rotate2D(double,double &,double &); ///< rotate 2d vector, given angle
void rotate2D(double,double,double &,double &); ///< rotate 2d vector, given sin and cos
double d2(double,double); ///< distance in 2D

#endif