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/**
@file Line.h
Line class
@maintainer Morgan McGuire, matrix@graphics3d.com
@created 2001-06-02
@edited 2006-02-28
*/
#ifndef G3D_LINE_H
#define G3D_LINE_H
#include "G3D/platform.h"
#include "G3D/Vector3.h"
namespace G3D {
class Plane;
/**
An infinite 3D line.
*/
class Line {
protected:
Vector3 _point;
Vector3 _direction;
Line(const Vector3& point, const Vector3& direction) {
_point = point;
_direction = direction.direction();
}
public:
/** Undefined (provided for creating Array<Line> only) */
inline Line() {}
virtual ~Line() {}
/**
Constructs a line from two (not equal) points.
*/
static Line fromTwoPoints(const Vector3 &point1, const Vector3 &point2) {
return Line(point1, point2 - point1);
}
/**
Creates a line from a point and a (nonzero) direction.
*/
static Line fromPointAndDirection(const Vector3& point, const Vector3& direction) {
return Line(point, direction);
}
/**
Returns the closest point on the line to point.
*/
Vector3 closestPoint(const Vector3& pt) const;
/**
Returns the distance between point and the line
*/
double distance(const Vector3& point) const {
return (closestPoint(point) - point).magnitude();
}
/** Returns a point on the line */
Vector3 point() const;
/** Returns the direction (or negative direction) of the line */
Vector3 direction() const;
/**
Returns the point where the line and plane intersect. If there
is no intersection, returns a point at infinity.
*/
Vector3 intersection(const Plane &plane) const;
};
};// namespace
#endif
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