327 lines
7.3 KiB
C++
327 lines
7.3 KiB
C++
// point3d.hxx -- a 3d point class.
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//
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// Adapted from algebra3 by Jean-Francois Doue, started October 1998.
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//
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// Copyright (C) 1998 Curtis L. Olson - curt@me.umn.edu
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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// (Log is kept at end of this file)
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#ifndef _POINT3D_HXX
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#define _POINT3D_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include <Misc/fgstream.hxx>
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#include "Include/fg_stl_config.h"
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#ifdef NEEDNAMESPACESTD
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using namespace std;
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#endif
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#include <assert.h>
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#include <Include/fg_constants.h>
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enum {PX, PY, PZ}; // axes
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///////////////////////////
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//
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// 3D Point
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//
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///////////////////////////
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class Point3D {
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protected:
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double n[3];
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public:
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// Constructors
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Point3D();
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Point3D(const double x, const double y, const double z);
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Point3D(const double d);
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Point3D(const Point3D &p);
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// Assignment operators
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Point3D& operator = ( const Point3D& p ); // assignment of a Point3D
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Point3D& operator += ( const Point3D& p ); // incrementation by a Point3D
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Point3D& operator -= ( const Point3D& p ); // decrementation by a Point3D
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Point3D& operator *= ( const double d ); // multiplication by a constant
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Point3D& operator /= ( const double d ); // division by a constant
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void setx(const double x);
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void sety(const double y);
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void setz(const double z);
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// Queries
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double& operator [] ( int i); // indexing
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double operator[] (int i) const; // read-only indexing
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double x() const; // cartesian x
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double y() const; // cartesian y
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double z() const; // cartesian z
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double lon() const; // polar longitude
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double lat() const; // polar latitude
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double radius() const; // polar radius
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double elev() const; // geodetic elevation (if specifying a surface point)
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// friends
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friend Point3D operator - (const Point3D& p); // -p1
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friend Point3D operator + (const Point3D& a, const Point3D& b); // p1 + p2
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friend Point3D operator - (const Point3D& a, const Point3D& b); // p1 - p2
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friend Point3D operator * (const Point3D& a, const double d); // p1 * 3.0
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friend Point3D operator * (const double d, const Point3D& a); // 3.0 * p1
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friend Point3D operator / (const Point3D& a, const double d); // p1 / 3.0
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friend bool operator == (const Point3D& a, const Point3D& b); // p1 == p2?
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friend bool operator != (const Point3D& a, const Point3D& b); // p1 != p2?
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// Special functions
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double distance3D(const Point3D& a, const Point3D& b); // distance between
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};
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// output to stream
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inline ostream&
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operator << ( ostream& out, Point3D& p)
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{
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double x, y, z;
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x = p.x();
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y = p.y();
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z = p.z();
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out << x << " " << y << " " << z;
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return out;
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}
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// input from stream
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inline istream&
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operator >> ( istream& in, Point3D& p)
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{
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double x, y, z;
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char c;
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in >> x;
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// read past optional comma
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while ( in.get(c) ) {
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if ( (c != ' ') && (c != ',') ) {
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// push back on the stream
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in.putback(c);
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break;
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}
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}
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in >> y;
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// read past optional comma
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while ( in.get(c) ) {
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if ( (c != ' ') && (c != ',') ) {
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// push back on the stream
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in.putback(c);
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break;
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}
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}
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in >> z;
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p = Point3D(x, y, z);
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return in;
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}
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///////////////////////////
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//
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// Point3D Member functions
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//
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///////////////////////////
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// CONSTRUCTORS
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inline Point3D::Point3D() {}
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inline Point3D::Point3D(const double x, const double y, const double z)
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{
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n[PX] = x; n[PY] = y; n[PZ] = z;
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}
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inline Point3D::Point3D(const double d)
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{
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n[PX] = n[PY] = n[PZ] = d;
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}
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inline Point3D::Point3D(const Point3D& p)
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{
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n[PX] = p.n[PX]; n[PY] = p.n[PY]; n[PZ] = p.n[PZ];
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}
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// ASSIGNMENT OPERATORS
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inline Point3D& Point3D::operator = (const Point3D& p)
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{
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n[PX] = p.n[PX]; n[PY] = p.n[PY]; n[PZ] = p.n[PZ]; return *this;
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}
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inline Point3D& Point3D::operator += ( const Point3D& p )
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{
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n[PX] += p.n[PX]; n[PY] += p.n[PY]; n[PZ] += p.n[PZ]; return *this;
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}
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inline Point3D& Point3D::operator -= ( const Point3D& p )
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{
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n[PX] -= p.n[PX]; n[PY] -= p.n[PY]; n[PZ] -= p.n[PZ]; return *this;
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}
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inline Point3D& Point3D::operator *= ( const double d )
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{
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n[PX] *= d; n[PY] *= d; n[PZ] *= d; return *this;
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}
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inline Point3D& Point3D::operator /= ( const double d )
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{
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double d_inv = 1./d; n[PX] *= d_inv; n[PY] *= d_inv; n[PZ] *= d_inv;
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return *this;
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}
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inline void Point3D::setx(const double x) {
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n[PX] = x;
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}
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inline void Point3D::sety(const double y) {
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n[PY] = y;
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}
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inline void Point3D::setz(const double z) {
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n[PZ] = z;
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}
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// QUERIES
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inline double& Point3D::operator [] ( int i)
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{
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assert(! (i < PX || i > PZ));
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return n[i];
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}
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inline double Point3D::operator [] ( int i) const {
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assert(! (i < PX || i > PZ));
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return n[i];
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}
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inline double Point3D::x() const { return n[PX]; }
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inline double Point3D::y() const { return n[PY]; }
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inline double Point3D::z() const { return n[PZ]; }
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inline double Point3D::lon() const { return n[PX]; }
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inline double Point3D::lat() const { return n[PY]; }
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inline double Point3D::radius() const { return n[PZ]; }
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inline double Point3D::elev() const { return n[PZ]; }
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// FRIENDS
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inline Point3D operator - (const Point3D& a)
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{
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return Point3D(-a.n[PX],-a.n[PY],-a.n[PZ]);
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}
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inline Point3D operator + (const Point3D& a, const Point3D& b)
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{
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return Point3D(a.n[PX]+ b.n[PX], a.n[PY] + b.n[PY], a.n[PZ] + b.n[PZ]);
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}
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inline Point3D operator - (const Point3D& a, const Point3D& b)
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{
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return Point3D(a.n[PX]-b.n[PX], a.n[PY]-b.n[PY], a.n[PZ]-b.n[PZ]);
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}
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inline Point3D operator * (const Point3D& a, const double d)
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{
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return Point3D(d*a.n[PX], d*a.n[PY], d*a.n[PZ]);
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}
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inline Point3D operator * (const double d, const Point3D& a)
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{
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return a*d;
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}
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inline Point3D operator / (const Point3D& a, const double d)
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{
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double d_inv = 1./d;
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return Point3D(a.n[PX]*d_inv, a.n[PY]*d_inv, a.n[PZ]*d_inv);
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}
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inline bool operator == (const Point3D& a, const Point3D& b)
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{
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return
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(a.n[PX] - b.n[PX]) < FG_EPSILON &&
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(a.n[PY] - b.n[PY]) < FG_EPSILON &&
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(a.n[PZ] - b.n[PZ]) < FG_EPSILON;
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}
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inline bool operator != (const Point3D& a, const Point3D& b)
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{
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return !(a == b);
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}
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// Special functions
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inline double distance3D(const Point3D& a, const Point3D& b)
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{
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double x, y, z;
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x = a[PX] - b[PX];
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y = a[PY] - b[PY];
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z = a[PZ] - b[PZ];
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return sqrt(x*x + y*y + z*z);
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}
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#endif // _POINT3D_HXX
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// $Log$
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// Revision 1.2 1998/10/18 01:17:12 curt
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// Point3D tweaks.
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//
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// Revision 1.1 1998/10/16 00:50:29 curt
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// Added point3d.hxx to replace cheezy fgPoint3d struct.
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//
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//
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