Planes ( d3_plane )

Definition

An instance P of the data type d3_plane is an oriented plane in the three-dimensional space R³. It can be defined by a tripel (a,b,c) of non-collinear points or a single point a and a normal vector v.

#include < LEDA/geo/d3_plane.h >

Creation

d3_plane	p	introduces a variable p of type d3_plane initialized to the xy-plane.
d3_plane	p(const d3_point& a, const d3_point& b, const d3_point& c)
		introduces a variable p of type d3_plane initialized to the plane through (a, b, c). Precondition a, b, and c are not collinear.
d3_plane	p(const d3_point& a, const vector& v)
		introduces a variable p of type d3_plane initialized to the plane that contains a with normal vector v. Precondition v.dim() = 3 and v.length() > 0.
d3_plane	p(const d3_point& a, const d3_point& b)
		introduces a variable p of type d3_plane initialized to the plane that contains a with normal vector b - a.

Operations

d3_point	p.point1()	returns the first point of p.
d3_point	p.point2()	returns the second point of p.
d3_point	p.point3()	returns the third point of p.
double	p.A()	returns the A parameter of the plane equation.
double	p.B()	returns the B parameter of the plane equation.
double	p.C()	returns the C parameter of the plane equation.
double	p.D()	returns the D parameter of the plane equation.
vector	p.normal()	returns a normal vector of p.
double	p.sqr_dist(const d3_point& q)
		returns the square of the Euclidean distance between p and q.
double	p.distance(const d3_point& q)
		returns the Euclidean distance between p and q.
int	p.cmp_distances(const d3_point& p1, const d3_point& p2)
		compares the distances of p1 and p2 to p and returns the result.
vector	p.normal_project(const d3_point& q)
		returns the vector pointing from q to its projection on p along the normal direction.
int	p.intersection(const d3_point p1, const d3_point p2, d3_point& q)
		if the line l through p1 and p2 intersects p in a single point this point is assigned to q and the result is 1, if l and p do not intersect the result is 0, and if l is contained in p the result is 2.
int	p.intersection(const d3_plane& Q, d3_point& i1, d3_point& i2)
		if p and plane Q intersect in a line L then (i1, i2) are assigned two different points on L and the result is 1, if p and Q do not intersect the result is 0, and if p = Q the result is 2.
d3_plane	p.translate(double dx, double dy, double dz)
		returns p translated by vector (dx, dy, dz).
d3_plane	p.translate(const vector& v)
		returns p+ v, i.e., p translated by vector v. Precondition v.dim() = 3.
d3_plane	p + const vector& v	returns p translated by vector v.
d3_plane	p.reflect(const d3_plane& Q)
		returns p reflected across plane Q.
d3_plane	p.reflect(const d3_point& q)
		returns p reflected across point q.
d3_point	p.reflect_point(const d3_point& q)
		returns q reflected across plane p.
int	p.side_of(const d3_point& q)
		computes the side of p on which q lies.
bool	p.contains(const d3_point& q)
		returns true if point q lies on plane p, i.e., (p.side_of(q) == 0), and false otherwise.
bool	p.parallel(const d3_plane& Q)
		returns true if planes p and Q are parallel and false otherwise.
ostream&	ostream& O « const d3_plane& p
		writes p to output stream O.
istream&	istream& I » d3_plane& p	reads the coordinates of p (six double numbers) from input stream I.

Non-Member Functions

int	orientation(const d3_plane& p, const d3_point& q)
		computes the orientation of p.sideof(q).