# QCPVector2D

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QCPVector2D Class Reference

## Public Member Functions

QCPVector2D ()

QCPVector2D (const QPoint &point)

QCPVector2D (const QPointF &point)

QCPVector2D (double x, double y)

double angle () const

double distanceSquaredToLine (const QCPVector2D &start, const QCPVector2D &end) const

double distanceSquaredToLine (const QLineF &line) const

double distanceToStraightLine (const QCPVector2D &base, const QCPVector2D &direction) const

double dot (const QCPVector2D &vec) const

bool isNull () const

double length () const

double lengthSquared () const

void normalize ()

QCPVector2D normalized () const

QCPVector2Doperator*= (double factor)

QCPVector2Doperator+= (const QCPVector2D &vector)

QCPVector2Doperator-= (const QCPVector2D &vector)

QCPVector2Doperator/= (double divisor)

QCPVector2D perpendicular () const

double & rx ()

double & ry ()

void setX (double x)

void setY (double y)

QPoint toPoint () const

QPointF toPointF () const

double x () const

double y () const

## Related Functions

(Note that these are not member functions.)

QDebug operator<< (QDebug d, const QCPVector2D &vec)

## Detailed Description

Represents two doubles as a mathematical 2D vector.

This class acts as a replacement for QVector2D with the advantage of double precision instead of single, and some convenience methods tailored for the QCustomPlot library.

Definition at line 387 of file qcustomplot.h.

## ◆ QCPVector2D() [1/4]

 QCPVector2D::QCPVector2D ( )

Creates a QCPVector2D object and initializes the x and y coordinates to 0.

Definition at line 100 of file qcustomplot.cpp.

## ◆ QCPVector2D() [2/4]

 QCPVector2D::QCPVector2D ( double x, double y )

Creates a QCPVector2D object and initializes the x and y coordinates with the specified values.

Definition at line 110 of file qcustomplot.cpp.

## ◆ QCPVector2D() [3/4]

 QCPVector2D::QCPVector2D ( const QPoint & point )

Creates a QCPVector2D object and initializes the x and y coordinates respective coordinates of the specified point.

Definition at line 120 of file qcustomplot.cpp.

## ◆ QCPVector2D() [4/4]

 QCPVector2D::QCPVector2D ( const QPointF & point )

Creates a QCPVector2D object and initializes the x and y coordinates respective coordinates of the specified point.

Definition at line 130 of file qcustomplot.cpp.

## ◆ angle()

 double QCPVector2D::angle ( ) const
inline

Returns the angle of the vector in radians. The angle is measured between the positive x line and the vector, counter-clockwise in a mathematical coordinate system (y axis upwards positive). In screen/widget coordinates where the y axis is inverted, the angle appears clockwise.

Definition at line 408 of file qcustomplot.h.

## ◆ distanceSquaredToLine() [1/2]

 double QCPVector2D::distanceSquaredToLine ( const QCPVector2D & start, const QCPVector2D & end ) const

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Returns the squared shortest distance of this vector (interpreted as a point) to the finite line segment given by start and end.

distanceToStraightLine

Definition at line 172 of file qcustomplot.cpp.

## ◆ distanceSquaredToLine() [2/2]

 double QCPVector2D::distanceSquaredToLine ( const QLineF & line ) const

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Returns the squared shortest distance of this vector (interpreted as a point) to the finite line segment given by line.

distanceToStraightLine

Definition at line 196 of file qcustomplot.cpp.

## ◆ distanceToStraightLine()

 double QCPVector2D::distanceToStraightLine ( const QCPVector2D & base, const QCPVector2D & direction ) const

Returns the shortest distance of this vector (interpreted as a point) to the infinite straight line given by a base point and a direction vector.

distanceSquaredToLine

Definition at line 207 of file qcustomplot.cpp.

## ◆ dot()

 double QCPVector2D::dot ( const QCPVector2D & vec ) const
inline

Returns the dot/scalar product of this vector with the specified vector vec.

Definition at line 416 of file qcustomplot.h.

## ◆ isNull()

 bool QCPVector2D::isNull ( ) const
inline

Returns whether this vector is null. A vector is null if `qIsNull` returns true for both x and y coordinates, i.e. if both are binary equal to 0.

Definition at line 412 of file qcustomplot.h.

## ◆ length()

 double QCPVector2D::length ( ) const
inline

Returns the length of this vector.

lengthSquared

Definition at line 406 of file qcustomplot.h.

## ◆ lengthSquared()

 double QCPVector2D::lengthSquared ( ) const
inline

Returns the squared length of this vector. In some situations, e.g. when just trying to find the shortest vector of a group, this is faster than calculating length, because it avoids calculation of a square root.

length

Definition at line 407 of file qcustomplot.h.

## ◆ normalize()

 void QCPVector2D::normalize ( )

Normalizes this vector. After this operation, the length of the vector is equal to 1.

If the vector has both entries set to zero, this method does nothing.

normalized, length, lengthSquared

Definition at line 143 of file qcustomplot.cpp.

## ◆ normalized()

 QCPVector2D QCPVector2D::normalized ( ) const

Returns a normalized version of this vector. The length of the returned vector is equal to 1.

If the vector has both entries set to zero, this method returns the vector unmodified.

normalize, length, lengthSquared

Definition at line 158 of file qcustomplot.cpp.

## ◆ operator*=()

 QCPVector2D & QCPVector2D::operator*= ( double factor )

Scales this vector by the given factor, i.e. the x and y components are multiplied by factor.

Definition at line 216 of file qcustomplot.cpp.

## ◆ operator+=()

 QCPVector2D & QCPVector2D::operator+= ( const QCPVector2D & vector )

Adds the given vector to this vector component-wise.

Definition at line 237 of file qcustomplot.cpp.

## ◆ operator-=()

 QCPVector2D & QCPVector2D::operator-= ( const QCPVector2D & vector )

subtracts the given vector from this vector component-wise.

Definition at line 247 of file qcustomplot.cpp.

## ◆ operator/=()

 QCPVector2D & QCPVector2D::operator/= ( double divisor )

Scales this vector by the given divisor, i.e. the x and y components are divided by divisor.

Definition at line 227 of file qcustomplot.cpp.

## ◆ perpendicular()

 QCPVector2D QCPVector2D::perpendicular ( ) const
inline

Returns a vector perpendicular to this vector, with the same length.

Definition at line 415 of file qcustomplot.h.

## ◆ setX()

 void QCPVector2D::setX ( double x )
inline

Sets the x coordinate of this vector to x.

setY

Definition at line 402 of file qcustomplot.h.

## ◆ setY()

 void QCPVector2D::setY ( double y )
inline

Sets the y coordinate of this vector to y.

setX

Definition at line 403 of file qcustomplot.h.

## ◆ toPoint()

 QPoint QCPVector2D::toPoint ( ) const
inline

Returns a QPoint which has the x and y coordinates of this vector, truncating any floating point information.

toPointF

Definition at line 409 of file qcustomplot.h.

## ◆ toPointF()

 QPointF QCPVector2D::toPointF ( ) const
inline

Returns a QPointF which has the x and y coordinates of this vector.

toPoint

Definition at line 410 of file qcustomplot.h.

## ◆ operator<<()

 QDebug operator<< ( QDebug d, const QCPVector2D & vec )
related

Prints vec in a human readable format to the qDebug output.

Definition at line 450 of file qcustomplot.h.

The documentation for this class was generated from the following files:
This file is part of the KDE documentation.