line3d.h

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// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#ifndef __IRR_LINE_3D_H_INCLUDED__
#define __IRR_LINE_3D_H_INCLUDED__

#include "irrTypes.h"
#include "vector3d.h"

namespace irr
{
namespace core
{

template <class T>
class line3d
{
        public:


                line3d() : start(0,0,0), end(1,1,1) {}
                line3d(T xa, T ya, T za, T xb, T yb, T zb) : start(xa, ya, za), end(xb, yb, zb) {}
                line3d(const vector3d<T>& start, const vector3d<T>& end) : start(start), end(end) {}

                // operators

                line3d<T> operator+(const vector3d<T>& point) const { return line3d<T>(start + point, end + point); }
                line3d<T>& operator+=(const vector3d<T>& point) { start += point; end += point; return *this; }

                line3d<T> operator-(const vector3d<T>& point) const { return line3d<T>(start - point, end - point); }
                line3d<T>& operator-=(const vector3d<T>& point) { start -= point; end -= point; return *this; }

                bool operator==(const line3d<T>& other) const
                { return (start==other.start && end==other.end) || (end==other.start && start==other.end);}
                bool operator!=(const line3d<T>& other) const
                { return !(start==other.start && end==other.end) || (end==other.start && start==other.end);}

                // functions
                void setLine(const T& xa, const T& ya, const T& za, const T& xb, const T& yb, const T& zb)
                {start.set(xa, ya, za); end.set(xb, yb, zb);}
                void setLine(const vector3d<T>& nstart, const vector3d<T>& nend)
                {start.set(nstart); end.set(nend);}
                void setLine(const line3d<T>& line)
                {start.set(line.start); end.set(line.end);}


                T getLength() const { return start.getDistanceFrom(end); }


                T getLengthSQ() const { return start.getDistanceFromSQ(end); }


                vector3d<T> getMiddle() const
                {
                        return (start + end)/(T)2;
                }


                vector3d<T> getVector() const
                {
                        return end - start;
                }


                bool isPointBetweenStartAndEnd(const vector3d<T>& point) const
                {
                        return point.isBetweenPoints(start, end);
                }


                vector3d<T> getClosestPoint(const vector3d<T>& point) const
                {
                        vector3d<T> c = point - start;
                        vector3d<T> v = end - start;
                        T d = (T)v.getLength();
                        v /= d;
                        T t = v.dotProduct(c);

                        if (t < (T)0.0)
                                return start;
                        if (t > d)
                                return end;

                        v *= t;
                        return start + v;
                }


                bool getIntersectionWithSphere(const vector3d<T>& sorigin, T sradius, f64& outdistance) const
                {
                        const vector3d<T> q = sorigin - start;
                        T c = q.getLength();
                        T v = q.dotProduct(getVector().normalize());
                        T d = sradius * sradius - (c*c - v*v);

                        if (d < 0.0)
                                return false;

                        outdistance = v - core::squareroot ( d );
                        return true;
                }

                // member variables

                vector3d<T> start;
                vector3d<T> end;
};

        typedef line3d<f32> line3df;
        typedef line3d<s32> line3di;

} // end namespace core
} // end namespace irr

#endif