QGeoPolygon Class

The QGeoPolygon class defines a geographic polygon. More...

Header: #include <QGeoPolygon>
CMake: find_package(Qt6 COMPONENTS Positioning REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Positioning)
qmake: QT += positioning
Since: Qt 5.10
Inherits: QGeoShape

Public Functions

QGeoPolygon(const QGeoShape &other)
QGeoPolygon(const QGeoPolygon &other)
QGeoPolygon(const QList<QGeoCoordinate> &path)
QGeoPolygon()
QGeoPolygon &operator=(const QGeoPolygon &other)
~QGeoPolygon()
void addCoordinate(const QGeoCoordinate &coordinate)
void addHole(const QVariant &holePath)
void addHole(const QList<QGeoCoordinate> &holePath)
bool containsCoordinate(const QGeoCoordinate &coordinate) const
QGeoCoordinate coordinateAt(qsizetype index) const
const QVariantList hole(qsizetype index) const
const QList<QGeoCoordinate> holePath(qsizetype index) const
qsizetype holesCount() const
void insertCoordinate(qsizetype index, const QGeoCoordinate &coordinate)
double length(qsizetype indexFrom = 0, qsizetype indexTo = -1) const
const QList<QGeoCoordinate> &perimeter() const
void removeCoordinate(const QGeoCoordinate &coordinate)
void removeCoordinate(qsizetype index)
void removeHole(qsizetype index)
void replaceCoordinate(qsizetype index, const QGeoCoordinate &coordinate)
void setPerimeter(const QList<QGeoCoordinate> &path)
qsizetype size() const
QString toString() const
void translate(double degreesLatitude, double degreesLongitude)
QGeoPolygon translated(double degreesLatitude, double degreesLongitude) const

Detailed Description

The polygon is defined by an ordered list of QGeoCoordinate objects representing its perimeter.

Each two adjacent elements in this list 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 date line 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.

Member Function Documentation

QGeoPolygon::QGeoPolygon(const QGeoShape &other)

Constructs a new geo polygon from the contents of other.

QGeoPolygon::QGeoPolygon(const QGeoPolygon &other)

Constructs a new geo polygon from the contents of other.

QGeoPolygon::QGeoPolygon(const QList<QGeoCoordinate> &path)

Constructs a new geo polygon from the coordinates specified in path.

QGeoPolygon::QGeoPolygon()

Constructs a new, empty geo polygon.

QGeoPolygon &QGeoPolygon::operator=(const QGeoPolygon &other)

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

QGeoPolygon::~QGeoPolygon()

Destroys this polygon.

[invokable] void QGeoPolygon::addCoordinate(const QGeoCoordinate &coordinate)

Appends coordinate to the polygon.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

[invokable, since 5.12] void QGeoPolygon::addHole(const QVariant &holePath)

Sets the holePath for a hole inside the polygon. The hole is a QVariant containing a QList<QGeoCoordinate>.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

This function was introduced in Qt 5.12.

[since 5.12] void QGeoPolygon::addHole(const QList<QGeoCoordinate> &holePath)

Overloaded method. Sets the holePath for a hole inside the polygon. The hole is a QList<QGeoCoordinate>.

This function was introduced in Qt 5.12.

[invokable] bool QGeoPolygon::containsCoordinate(const QGeoCoordinate &coordinate) const

Returns true if the polygon's perimeter contains coordinate as one of the elements.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

[invokable] QGeoCoordinate QGeoPolygon::coordinateAt(qsizetype index) const

Returns the coordinate at index .

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

[invokable, since 5.12] const QVariantList QGeoPolygon::hole(qsizetype index) const

Returns a QVariant containing a QList<QGeoCoordinate> which represents the hole at index.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

This function was introduced in Qt 5.12.

[since 5.12] const QList<QGeoCoordinate> QGeoPolygon::holePath(qsizetype index) const

Returns a QList<QGeoCoordinate> which represents the hole at index.

This function was introduced in Qt 5.12.

[invokable, since 5.12] qsizetype QGeoPolygon::holesCount() const

Returns the number of holes.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

This function was introduced in Qt 5.12.

[invokable] void QGeoPolygon::insertCoordinate(qsizetype index, const QGeoCoordinate &coordinate)

Inserts coordinate at the specified index.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

[invokable] double QGeoPolygon::length(qsizetype indexFrom = 0, qsizetype indexTo = -1) const

Returns the length of the polygon's perimeter, 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.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

[since QtPositioning 5.12] const QList<QGeoCoordinate> &QGeoPolygon::perimeter() const

Returns all the elements of the polygon's perimeter.

Note: Getter function for property perimeter.

This function was introduced in QtPositioning 5.12.

See also setPerimeter().

[invokable] void QGeoPolygon::removeCoordinate(const QGeoCoordinate &coordinate)

Removes the last occurrence of coordinate from the polygon.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

[invokable] void QGeoPolygon::removeCoordinate(qsizetype index)

Removes element at position index from the polygon.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

[invokable, since 5.12] void QGeoPolygon::removeHole(qsizetype index)

Removes element at position index from the list of holes.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

This function was introduced in Qt 5.12.

[invokable] void QGeoPolygon::replaceCoordinate(qsizetype index, const QGeoCoordinate &coordinate)

Replaces the path element at the specified index with coordinate.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

[since QtPositioning 5.12] void QGeoPolygon::setPerimeter(const QList<QGeoCoordinate> &path)

Sets the perimeter of the polygon based on a list of coordinates path.

Note: Setter function for property perimeter.

This function was introduced in QtPositioning 5.12.

See also perimeter().

[invokable, since 5.10] qsizetype QGeoPolygon::size() const

Returns the number of elements in the polygon.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

This function was introduced in Qt 5.10.

[invokable] QString QGeoPolygon::toString() const

Returns the geo polygon properties as a string.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

[invokable] void QGeoPolygon::translate(double degreesLatitude, double degreesLongitude)

Translates this geo polygon by degreesLatitude northwards and degreesLongitude eastwards.

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

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

[invokable] QGeoPolygon QGeoPolygon::translated(double degreesLatitude, double degreesLongitude) const

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

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

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

See also translate().

© 2021 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.