libsegl/punkt3d.cpp

/* libsegl - Sebas Extended GL Library
 *           Collection of Opengl/3D-Math helpers
 *
 *      Copyright (c) 2008 by Sebastian Lohff, seba@seba-geek.de
 *      http://www.seba-geek.de
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 */

#include "punkt3d.h"

namespace segl {

Punkt3D::Punkt3D() {
	x = y = z = 0.0f;
}

Punkt3D::Punkt3D(float _x, float _y, float _z) {
	set(_x, _y, _z);
}

void Punkt3D::set(float _x, float _y, float _z) {
	x = _x;
	y = _y;
	z = _z;
}

float Punkt3D::abs() const {
	return sqrt(x*x+y*y+z*z);
}

Punkt3D Punkt3D::kreuzprodukt(const Punkt3D &b) const {
	Punkt3D erg;
	erg.x = y*b.z - z*b.y;
	erg.y = z*b.x - x*b.z;
	erg.z = x*b.y - y*b.x;
	
	return erg;
}

void Punkt3D::normalize() {
	float a = abs();
	x /= a;
	y /= a;
	z /= a;
}

Punkt3D Punkt3D::getNormalized() const {
	Punkt3D ret(*this);
	ret.normalize();
	return ret;
}

bool Punkt3D::isNormalized() const {
	return (abs()==1.0f);
}

float Punkt3D::calcAngle(Punkt3D b) const {
	if(abs()*b.abs()==0.0f)
		return 0.0f;
	return rad2deg(std::acos(((*this)*b)/(abs()*b.abs())));
}

Punkt3D Punkt3D::getOrtographic() const {
	Punkt3D erg;
	if(!x) {
		erg.x = 0.0f;
		erg.y = z;
		erg.z = -y;
	} else if(!y) {
		erg.x = z;
		erg.y = 0;
		erg.z = -x;
	} else {
		// z, oder genereller fall
		erg.x = y;
		erg.y = -x;
		erg.z = 0.0f;
	}
	return erg;
}

Punkt3D Punkt3D::getOrtographic2() const {
	Punkt3D nullvec;
	Punkt3D erg;
	erg.set(y, -x, 0.0f);
	if(erg!=nullvec)
		return erg;
	erg.set(z, 0.0f, -x);
	if(erg!=nullvec)
		return erg;
	erg.set(0.0f, z, -y);
	return erg;
}

void Punkt3D::print(std::string coordname) const {
	if(coordname!="")
		coordname.append(" ");
	std::cout << coordname << "Coord: (" << x << ", " << y << ", " << z << ")" << std::endl;
}

Punkt3D Punkt3D::operator+(const Punkt3D &b) const {
	Punkt3D c;
	c.x =  x + b.x;
	c.y =  y + b.y;
	c.z =  z + b.z;
	
	return c;
}

Punkt3D Punkt3D::operator-(const Punkt3D &b) const {
	Punkt3D c;
	c.x =  x - b.x;
	c.y =  y - b.y;
	c.z =  z - b.z;
	
	return c;
}

Punkt3D& Punkt3D::operator+=(const Punkt3D &b) {
	x +=  b.x;
	y +=  b.y;
	z +=  b.z;
	
	return *this;
}

Punkt3D& Punkt3D::operator-=(const Punkt3D &b) {
	x -=  b.x;
	y -=  b.y;
	z -=  b.z;
	
	return *this;
}

Punkt3D Punkt3D::operator+(const float &_m) const {
	return Punkt3D(x+_m, y+_m, z+_m);
}

Punkt3D Punkt3D::operator-(const float &_m) const {
	return Punkt3D(x-_m, y-_m, z-_m);
}

Punkt3D Punkt3D::operator*(const float &_m) const {
	return Punkt3D(x*_m, y*_m, z*_m);
}

Punkt3D Punkt3D::operator/(const float &_m) const {
	return Punkt3D(x/_m, y/_m, z/_m);
}

Punkt3D& Punkt3D::operator+=(const float &_m) {
	x += _m;
	y += _m;
	z += _m;
	return *this;
}
Punkt3D& Punkt3D::operator-=(const float &_m) {
	x -= _m;
	y -= _m;
	z -= _m;
	return *this;
}
Punkt3D& Punkt3D::operator*=(const float &_m) {
	x *= _m;
	y *= _m;
	z *= _m;
	return *this;
}
Punkt3D& Punkt3D::operator/=(const float &_m) {
	x /= _m;
	y /= _m;
	z /= _m;
	return *this;
}

float Punkt3D::operator*(const Punkt3D& _m) const {
	return x * _m.x + y * _m.y + z * _m.z;
}

Punkt3D Punkt3D::operator-() const {
	return Punkt3D(-x, -y, -z);
}

bool Punkt3D::operator==(const Punkt3D& b) const {
	return ( x==b.x && y==b.y && z==b.z);
}
bool Punkt3D::operator!=(const Punkt3D& b) const {
	return !(*this==b);
}

// Freunde

segl::Punkt3D operator+(const float& _m, const segl::Punkt3D& b) {
	return segl::Punkt3D(b.x+_m, b.y+_m, b.z+_m);
}

segl::Punkt3D operator-(const float& _m, const segl::Punkt3D& b) {
	return segl::Punkt3D(b.x-_m, b.y-_m, b.z-_m);
}

segl::Punkt3D operator*(const float& _m, const segl::Punkt3D& b) {
	return segl::Punkt3D(b.x*_m, b.y*_m, b.z*_m);
}

segl::Punkt3D operator/(const float& _m, const segl::Punkt3D& b) {
	return segl::Punkt3D(b.x/_m, b.y/_m, b.z/_m);
}

std::ostream &operator<<(std::ostream &ostr, const segl::Punkt3D &r) {
	return ostr << "(" << r.x << ", " << r.y << ", " << r.z << ")";
}

} // namespace segl

float abs(const segl::Punkt3D &p) {
	return p.abs();
}

// OpenGL Funktionen f<>r Punkt3D

void glVertex3f(const segl::Punkt3D &p) {
	glVertex3f(p.x, p.y, p.z);
}

void glTranslatef(const segl::Punkt3D &p) {
	glTranslatef(p.x, p.y, p.z);
}

void glNormal3f(const segl::Punkt3D &p) {
	glNormal3f(p.x, p.y, p.z);
}

void glRotatef(const float &deg, const segl::Punkt3D &vec) {
	glRotatef(deg, vec.x, vec.y, vec.z);
}

// Funktionen mit richtgen bezeichnern
void glVertexP3D(const segl::Punkt3D &p) {
	glVertex3f(p.x, p.y, p.z);
}

void glTranslateP3D(const segl::Punkt3D &p) {
	glTranslatef(p.x, p.y, p.z);
}

void glNormalP3D(const segl::Punkt3D &p) {
	glNormal3f(p.x, p.y, p.z);
}

void glRotateP3D(const float &deg, const segl::Punkt3D &vec) {
	glRotatef(deg, vec.x, vec.y, vec.z);
}

void gluLookAt(const segl::Punkt3D &pos, const segl::Punkt3D &viewport, const segl::Punkt3D &normal) {
	gluLookAt( pos.x, pos.y, pos.z,
			   viewport.x, viewport.y, viewport.z,
			   normal.x, normal.y, normal.z );
}