Point4dC - Point in 4D space

User Documentation

Centre for Vision, Speech & Signal Processing

Comments:
The class Point4dC represents a geometrical entity point in 4 dimensional Euclidian space. A point is represented by a quadruple of coordinates. The index of a coordinate can be 0 for x, 1 for y, 2 for z, 3 for t.

Derived Classes:

Vector4dC

PPointPlane3dC

Enumerated types:

Typedefs:

typedef StdTypeC::RealT CoordT;: An coordinate.
typedef StdTypeC::RealT DistanceT;: Distance of points.
typedef StdTypeC::RealT AngleT;: An angle in rad.
typedef StdTypeC::RealT CosAngleT;: The cosinus of an angle of three points.

Variables:

Methods:

Point4dC(istream & inS): Reads and creates the point from the input stream.
Point4dC(): Creates the point (0.0, 0.0, 0.0, 0.0).
Point4dC(CoordT xCoor,CoordT yCoor,CoordT zCoor,CoordT tCoor): Creates the point (xCoor, yCoor, zCoor, tCoor).
Point4dC(const Point4dC & point): Copy constructor.
const Point4dC & operator=(const Point4dC & p): Assigment. Access to the object --------------------
IndexT N() const: Returns the number of coordinates.
const CoordT & operator[](IndexT i) const: Access to the i-th constant coordinate.
CoordT & operator[](IndexT i): Access to the i-th coordinate.
CoordT & X(): Access to the first coordinate.
CoordT & Y(): Access to the second coordinate.
CoordT & Z(): Access to the third coordinate.
CoordT & T(): Access to the fourth coordinate.
const CoordT & X() const: Access to the first constant coordinate.
const CoordT & Y() const: Access to the second constant coordinate.
const CoordT & Z() const: Access to the third constant coordinate.
const CoordT & T() const: Access to the fourth constant coordinate.
const Point4dC & Point4d() const: Access to the constant point.
Point4dC & Point4d(): Access to the point. Logical operators with points -----------------------------
BooleanT operator==(const Point4dC & point) const: Returns TRUE if 2 points are the same point. Two points are claimed to be same iff their relative distance error is small (under 'relZero' threshold). If both points are close to the origin of the coordinate system, their absolute distance error is compared to 'zeroDistance'.
BooleanT operator!=(const Point4dC & point) const: Returns TRUE if 2 points are different. 2 points are different iff they are not equal in the sense of the operator '=='.
BooleanT operator>(const Point4dC & point) const: Returns TRUE if all coordinates are bigger then the coordinates of the point.
BooleanT OneBigger(const Point4dC & point) const: Returns TRUE if one coordinate is bigger then the related one of the point. Setting of the point --------------------
Point4dC & SetZero(): Sets all coordinates to be 0.0.
void Set(const Point4dC & point): Sets coordinates according to the values of 'point'.
void Set(const CoordT xCoor,const CoordT yCoor,const CoordT zCoor,const CoordT tCoor): Sets the point to the new coordinates.
Point4dC & SetMinimum(const Point4dC & point): Sets the point coordinates to minimal value from both points.
Point4dC & SetMaximum(const Point4dC & point): Sets the point coordinates to maximal value from both points. Information about extrems -------------------------
IndexT MinIndex() const: Returns the index of the minimum value.
IndexT MaxIndex() const: Returns the index of the maximum value.
IndexT AbsMinIndex() const: Returns the index of the minimum coordinate in absolute value.
IndexT AbsMaxIndex() const: Returns the index of the maximum coordinate in absolute value.
CoordT Min() const: Returns the minimum coordinate.
CoordT Max() const: Returns the maximum coordinate. Arithmetical operations -----------------------
const Point4dC & operator+=(const Point4dC & point): Adds the point.
const Point4dC & operator-=(const Point4dC & point): Subtracts the point.
const Point4dC & operator*=(const Point4dC & point): Multiplies items by point items.
const Point4dC & operator/=(const Point4dC & point): Divides items by point items.
const Point4dC & operator*=(const RealT alpha): Multiplies items by 'alpha'.
const Point4dC & operator/=(const RealT alpha): Divides items by 'alpha'.
Point4dC operator+(const Point4dC & v) const: Adds 2 points.
Vector4dC operator-(const Point4dC & v) const: Returns the difference between 2 points.
Point4dC operator*(const Point4dC & v) const: Returns the points which coordinates are results of multiplication of this point and 'v' points item by item.
Point4dC operator/(const Point4dC & v) const: Returns the points which coordinates are results of division of this point and 'v' points item by item.
Point4dC operator*(const RealT alpha) const: Returns the points which coordinates are these coordinates multiplied by 'alpha'.
Point4dC operator/(const RealT alpha) const: Returns the points which coordinates are these coordinates divided by 'alpha'.
Point4dC operator+(const Vector4dC & v) const: Returns the point = 'this point' + v;
RealT operator&(const Point4dC & p) const: Returns the sum X()*p.X() + Y()*p.Y() + Z()*p.Z(). In 3 dimensional Euclidian vector space the result is equivalent to dot product of 2 vectors. Euclidian geometry ------------------
Point4dC Translation(const Point4dC & newOrigin) const: Returns the point with coordinates related to the new origin 'newOrigin'.
RealT SqrEuclidDistance(const Point4dC & point) const: Returns the square of Euclid distance between this point and 'point'.
RealT EuclidDistance(const Point4dC & point) const: Returns the Euclid distance between this point and point.
RealT EDistanceFromOrigin() const: Returns the Euclid distance of this point from the coordinate origin.
CosAngleT CosAngle(const Point4dC & m,const Point4dC & b) const: Returns the cosinus of the angle (this point, m, b).
AngleT Angle(const Point4dC & m,const Point4dC & b) const: Returns the angle (this point, m, b). The angle range in rad is 0 to PI and the angle is not oriented.
AngleT AngleOrigin(const Point4dC & p) const: Returns the angle in rad between points 'this point', (0,0,0), and the point 'p'. The angle range is 0 to PI and the angle is not oriented.
Point4dC MidPoint(const Point4dC & p) const: Returns the point which is in the middle of this point and the point 'p'.
Point4dC Center(const Point4dC & point) const: Returns the point which is in the middle of both points. Useful functions with points ----------------------------
RealT AbsDistance(const Point4dC & point) const: Returns the block distance between this point and 'point'.
RealT MahalanobisDistance(const Point4dC & mean,const Matrix4d4C & invCov): Returns the Mahalanobis distance from the 'mean'. The 'invCov' is the inversion of the covariance matrix.
CoordT Sum() const: Returns the sum of coordinates.
CoordT SumAbs() const: Returns the sum of absolute value of coordinates.
Point4dC & Sqrt(): Changes all coordinates into their square root values.
Point4dC & Abs(): Changes all coordinates into their absolute values.
Point4dC & Normalize(): Scales the coordinates of the point to have the distance from the origin equal to 1. The point is supposed to be different from the origin.
Point4dC & NormalizeSum(): Scales the coordinates of the point to have unit sum. The point is supposed to be different from the origin. Relationship with a line ------------------------
Point4dC OrthoProjectionInto(const Line4dPVC & l) const: Returns the orthogonal projection of the point into the line 'l'. Relationship with a plane -------------------------
Point4dC OrthoProjectionInto(const PlanePVV4dC & plane) const: Returnss the orthogonal projection of the point into the plane. Computational precision -----------------------
void FixAlmostZero(): If the absolute value of a coordinate is smaller than zoroDistance the function sets the coordinate to be zero.
RealT SetZeroDistance(RealT zero): Sets the precision of test of zero distance of points. The function returns the previous value.
BooleanT IsAlmostZero(RealT a): Returns TRUE if 'a' is smaller or equal to zeroDistance.
RealT SetRelZero(RealT zero): Sets the precision of the relative error test. The function returns the previous value.
BooleanT IsRelZero(RealT a): Returns TRUE if 'a' is smaller than or equal to 'relZero'.

Programmer:Radek Marik, Documentation by CxxDoc: Tue Mar 20 10:48:08 2001

Point4dC

Point in 4D space

include	"amma/Point4d.hh"
User Level:	Default
Library:	Mag4
Example:	exMat2d.cc
Section:	Geometry.4-D
In Scope:	std