Qt 5.9 | Qt Positioning | C++ Classes | QGeoPath

Qt 5.9.9 Reference Documentation

# QGeoPath Class

The QGeoPath class defines a geographic path. More...

Header: | #include <QGeoPath>
qmake: | QT += positioning
Since: | Qt 5.9
Inherits: | QGeoShape

- List of all members, including inherited members

## Properties

- path : QList<QGeoCoordinate>
- width : qreal

- 3 properties inherited from QGeoShape

## Public Functions

| QGeoPath()
| QGeoPath(const QList<QGeoCoordinate> &path, const qreal &width = 0.0)
| QGeoPath(const QGeoPath &other)
| QGeoPath(const QGeoShape &other)
| ~QGeoPath()
void | addCoordinate(const QGeoCoordinate &coordinate)
bool | containsCoordinate(const QGeoCoordinate &coordinate) const
QGeoCoordinate | coordinateAt(int index) const
void | insertCoordinate(int index, const QGeoCoordinate &coordinate)
double | length(int indexFrom = 0, int indexTo = -1) const
const QList<QGeoCoordinate> & | path() const
void | removeCoordinate(const QGeoCoordinate &coordinate)
void | removeCoordinate(int index)
void | replaceCoordinate(int index, const QGeoCoordinate &coordinate)
void | setPath(const QList<QGeoCoordinate> &path)
void | setWidth(const qreal &width)
QString | toString() const
void | translate(double degreesLatitude, double degreesLongitude)
QGeoPath | translated(double degreesLatitude, double degreesLongitude) const
qreal | width() const
bool | operator!=(const QGeoPath &other) const
QGeoPath & | operator=(const QGeoPath &other)
bool | operator==(const QGeoPath &other) const

- 10 public functions inherited from QGeoShape

## Detailed Description

The QGeoPath class defines a geographic path.

The path is defined by an ordered list of QGeoCoordinates.

Each two adjacent elements in the path are intended to be connected together by the shortest line segment of constant bearing passing through both elements. This type of connection can cross the dateline in the longitudinal direction, but never crosses the poles.

This is relevant for the calculation of the bounding box returned by QGeoShape::boundingGeoRectangle() for this shape, which will have the latitude of the top left corner set to the maximum latitude in the path point set. Similarly, the latitude of the bottom right corner will be the minimum latitude in the path point set.

This class is a Q_GADGET. It can be directly used from C++ and QML.

## Property Documentation

### path : QList<QGeoCoordinate>

This property holds the list of coordinates for the geo path.

The path is both invalid and empty if it contains no coordinate.

A default constructed QGeoPath is therefore invalid.

Access functions:

const QList<QGeoCoordinate> & | path() const
void | setPath(const QList<QGeoCoordinate> &path)

### width : qreal

Access functions:

qreal | width() const
void | setWidth(const qreal &width)

## Member Function Documentation

### QGeoPath::QGeoPath()

Constructs a new, empty geo path.

### QGeoPath::QGeoPath(const QList<QGeoCoordinate> &path, const qreal &width = 0.0)

Constructs a new geo path from a list of coordinates (path and width).

### QGeoPath::QGeoPath(const QGeoPath &other)

Constructs a new geo path from the contents of other.

### QGeoPath::QGeoPath(const QGeoShape &other)

Constructs a new geo path from the contents of other.

### QGeoPath::~QGeoPath()

Destroys this path.

### void QGeoPath::addCoordinate(const QGeoCoordinate &coordinate)

Appends coordinate to the path.

### bool QGeoPath::containsCoordinate(const QGeoCoordinate &coordinate) const

Returns true if the path contains coordinate as one of the elements.

### QGeoCoordinate QGeoPath::coordinateAt(int index) const

Returns the coordinate at index .

### void QGeoPath::insertCoordinate(int index, const QGeoCoordinate &coordinate)

Inserts coordinate at the specified index.

### double QGeoPath::length(int indexFrom = 0, int indexTo = -1) const

Returns the length of the path, in meters, from the element indexFrom to the element indexTo. The length is intended to be the sum of the shortest distances for each pair of adjacent points.

### const QList<QGeoCoordinate> &QGeoPath::path() const

Returns all the elements. Equivalent to QGeoShape::center(). The center coordinate, in case of a QGeoPath, is the center of its bounding box.

Note: Getter function for property path.

See also setPath().

### void QGeoPath::removeCoordinate(const QGeoCoordinate &coordinate)

Removes the last occurrence of coordinate from the path.

### void QGeoPath::removeCoordinate(int index)

Removes element at position index from the path.

### void QGeoPath::replaceCoordinate(int index, const QGeoCoordinate &coordinate)

Replaces the path element at the specified index with coordinate.

### QString QGeoPath::toString() const

Returns the geo path properties as a string.

### void QGeoPath::translate(double degreesLatitude, double degreesLongitude)

Translates this geo path by degreesLatitude northwards and degreesLongitude eastwards.

Negative values of degreesLatitude and degreesLongitude correspond to southward and westward translation respectively.

### QGeoPath QGeoPath::translated(double degreesLatitude, double degreesLongitude) const

Returns a copy of this geo path translated by degreesLatitude northwards and degreesLongitude eastwards.

Negative values of degreesLatitude and degreesLongitude correspond to southward and westward translation respectively.

See also translate().

### qreal QGeoPath::width() const

Returns the width of the path, in meters. This information is used in the contains method The default value is 0.

Note: Getter function for property width.

See also setWidth().

### bool QGeoPath::operator!=(const QGeoPath &other) const

Returns whether this geo path is not equal to other.

### QGeoPath &QGeoPath::operator=(const QGeoPath &other)

Assigns other to this geo path and returns a reference to this geo path.

### bool QGeoPath::operator==(const QGeoPath &other) const

Returns whether this geo path is equal to other.