QGeoCoordinate Class▲
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Header: QGeoCoordinate
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Since: Qt 5.2
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CMake:
find_package(Qt6 REQUIRED COMPONENTS Positioning)
target_link_libraries(mytarget PRIVATE Qt6::Positioning)
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qmake: QT += positioning
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Group: QGeoCoordinate is part of QtPositioning-positioning
Detailed Description▲
A QGeoCoordinate is defined by latitude, longitude, and optionally, altitude.
Use type() to determine whether a coordinate is a 2D coordinate (has latitude and longitude only) or 3D coordinate (has latitude, longitude and altitude). Use distanceTo() and azimuthTo() to calculate the distance and bearing between coordinates.
The coordinate values should be specified using the WGS84 datum. For more information on geographical terms see this article on coordinates and another on geodetic systems including WGS84.
Azimuth in this context is equivalent to a compass bearing based on true north.
This class is a Q_GADGET since Qt 5.5. It can be directly used from C++ and QML.
Member Type Documentation▲
enum QGeoCoordinate::CoordinateFormat▲
Defines the possible formatting options for toString().
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Constant |
Value |
Description |
|---|---|---|
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QGeoCoordinate::Degrees |
0 |
Returns a string representation of the coordinates in decimal degrees format. |
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QGeoCoordinate::DegreesWithHemisphere |
1 |
Returns a string representation of the coordinates in decimal degrees format, using 'N', 'S', 'E' or 'W' to indicate the hemispheres of the coordinates. |
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QGeoCoordinate::DegreesMinutes |
2 |
Returns a string representation of the coordinates in degrees-minutes format. |
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QGeoCoordinate::DegreesMinutesWithHemisphere |
3 |
Returns a string representation of the coordinates in degrees-minutes format, using 'N', 'S', 'E' or 'W' to indicate the hemispheres of the coordinates. |
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QGeoCoordinate::DegreesMinutesSeconds |
4 |
Returns a string representation of the coordinates in degrees-minutes-seconds format. |
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QGeoCoordinate::DegreesMinutesSecondsWithHemisphere |
5 |
Returns a string representation of the coordinates in degrees-minutes-seconds format, using 'N', 'S', 'E' or 'W' to indicate the hemispheres of the coordinates. |
See Also▲
See also toString()
enum QGeoCoordinate::CoordinateType▲
Defines the types of a coordinate.
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Constant |
Value |
Description |
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QGeoCoordinate::InvalidCoordinate |
0 |
An invalid coordinate. A coordinate is invalid if its latitude or longitude values are invalid. |
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QGeoCoordinate::Coordinate2D |
1 |
A coordinate with valid latitude and longitude values. |
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QGeoCoordinate::Coordinate3D |
2 |
A coordinate with valid latitude and longitude values, and also an altitude value. |
Property Documentation▲
[since 5.5] altitude : double▲
This property holds the altitude in meters above sea level.
The property is undefined (qQNaN()) if the altitude has not been set.
While this property is introduced in Qt 5.5, the related accessor functions exist since the first version of this class.
This property was introduced in Qt 5.5.
Access functions:
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double altitude() const
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void setAltitude(double altitude)
[read-only, since 5.5] isValid : const bool▲
This property holds the validity of this geo coordinate.
The geo coordinate is valid if the longitude and latitude properties have been set to valid values.
While this property is introduced in Qt 5.5, the related accessor functions exist since the first version of this class.
This property was introduced in Qt 5.5.
Access functions:
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bool isValid() const
[since 5.5] latitude : double▲
This property holds the latitude in decimal degrees.
The property is undefined (qQNaN()) if the latitude has not been set. A positive latitude indicates the Northern Hemisphere, and a negative latitude indicates the Southern Hemisphere. When setting the latitude the new value should be in the WGS84 datum format.
To be valid, the latitude must be between -90 to 90 inclusive.
While this property is introduced in Qt 5.5, the related accessor functions exist since the first version of this class.
This property was introduced in Qt 5.5.
Access functions:
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double latitude() const
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void setLatitude(double latitude)
[since 5.5] longitude : double▲
This property holds the longitude in decimal degrees.
The property is undefined (qQNaN()) if the longitude has not been set. A positive longitude indicates the Eastern Hemisphere, and a negative longitude indicates the Western Hemisphere. When setting the longitude the new value should be in the WGS84 datum format.
To be valid, the longitude must be between -180 to 180 inclusive.
While this property is introduced in Qt 5.5, the related accessor functions exist since the first version of this class.
This property was introduced in Qt 5.5.
Access functions:
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double longitude() const
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void setLongitude(double longitude)
Member Function Documentation▲
QGeoCoordinate::QGeoCoordinate()▲
Constructs a coordinate. The coordinate will be invalid until setLatitude() and setLongitude() have been called.
QGeoCoordinate::QGeoCoordinate(double latitude, double longitude)▲
Constructs a coordinate with the given latitude and longitude.
If the latitude is not between -90 to 90 inclusive, or the longitude is not between -180 to 180 inclusive, none of the values are set and the type() will be QGeoCoordinate::InvalidCoordinate.
See Also▲
See also isValid()
QGeoCoordinate::QGeoCoordinate(double latitude, double longitude, double altitude)▲
Constructs a coordinate with the given latitude, longitude and altitude.
If the latitude is not between -90 to 90 inclusive, or the longitude is not between -180 to 180 inclusive, none of the values are set and the type() will be QGeoCoordinate::InvalidCoordinate.
Note that altitude specifies the meters above sea level.
See Also▲
See also isValid()
QGeoCoordinate::QGeoCoordinate(const QGeoCoordinate &other)▲
Constructs a coordinate from the contents of other.
[since 6.2] QGeoCoordinate::QGeoCoordinate(QGeoCoordinate &&other)▲
Constructs a coordinate by moving from other.
The moved-from QGeoCoordinate object can only be destroyed or assigned to. The effect of calling other functions than the destructor or one of the assignment operators is undefined.
This function was introduced in Qt 6.2.
QGeoCoordinate::~QGeoCoordinate()▲
Destroys the coordinate object.
double QGeoCoordinate::altitude() const▲
Returns the altitude (meters above sea level).
The return value is undefined if the altitude has not been set.
Getter function for property altitude.
See Also▲
See also setAltitude(), type()
QGeoCoordinate QGeoCoordinate::atDistanceAndAzimuth(qreal distance, qreal azimuth, qreal distanceUp = 0.0) const▲
Returns the coordinate that is reached by traveling distance meters from the current coordinate at azimuth (or bearing) along a great-circle. There is an assumption that the Earth is spherical for the purpose of this calculation.
The altitude will have distanceUp added to it.
Returns an invalid coordinate if this coordinate is invalid.
qreal QGeoCoordinate::azimuthTo(const QGeoCoordinate &other) const▲
Returns the azimuth (or bearing) in degrees from this coordinate to the coordinate specified by other. Altitude is not used in the calculation.
The bearing returned is the bearing from the origin to other along the great-circle between the two coordinates. There is an assumption that the Earth is spherical for the purpose of this calculation.
Returns 0 if the type of this coordinate or the type of other is QGeoCoordinate::InvalidCoordinate.
qreal QGeoCoordinate::distanceTo(const QGeoCoordinate &other) const▲
Returns the distance (in meters) from this coordinate to the coordinate specified by other. Altitude is not used in the calculation.
This calculation returns the great-circle distance between the two coordinates, with an assumption that the Earth is spherical for the purpose of this calculation.
Returns 0 if the type of this coordinate or the type of other is QGeoCoordinate::InvalidCoordinate.
bool QGeoCoordinate::isValid() const▲
double QGeoCoordinate::latitude() const▲
Returns the latitude, in decimal degrees. The return value is undefined if the latitude has not been set.
A positive latitude indicates the Northern Hemisphere, and a negative latitude indicates the Southern Hemisphere.
Getter function for property latitude.
See Also▲
See also setLatitude(), type()
double QGeoCoordinate::longitude() const▲
Returns the longitude, in decimal degrees. The return value is undefined if the longitude has not been set.
A positive longitude indicates the Eastern Hemisphere, and a negative longitude indicates the Western Hemisphere.
Getter function for property longitude.
See Also▲
See also setLongitude(), type()
void QGeoCoordinate::setAltitude(double altitude)▲
Sets the altitude (meters above sea level) to altitude.
Setter function for property altitude.
See Also▲
See also altitude()
void QGeoCoordinate::setLatitude(double latitude)▲
Sets the latitude (in decimal degrees) to latitude. The value should be in the WGS84 datum.
To be valid, the latitude must be between -90 to 90 inclusive.
Setter function for property latitude.
See Also▲
See also latitude()
void QGeoCoordinate::setLongitude(double longitude)▲
Sets the longitude (in decimal degrees) to longitude. The value should be in the WGS84 datum.
To be valid, the longitude must be between -180 to 180 inclusive.
Setter function for property longitude.
See Also▲
See also longitude()
QString QGeoCoordinate::toString(QGeoCoordinate::CoordinateFormat format = DegreesMinutesSecondsWithHemisphere) const▲
Returns this coordinate as a string in the specified format.
For example, if this coordinate has a latitude of -27.46758, a longitude of 153.027892 and an altitude of 28.1, these are the strings returned depending on format:
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format value |
Returned string |
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-27.46758°, 153.02789°, 28.1m |
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27.46758° S, 153.02789° E, 28.1m |
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-27° 28.054', 153° 1.673', 28.1m |
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27° 28.054 S', 153° 1.673' E, 28.1m |
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-27° 28' 3.2", 153° 1' 40.4", 28.1m |
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27° 28' 3.2" S, 153° 1' 40.4" E, 28.1m |
The altitude field is omitted if no altitude is set.
If the coordinate is invalid, an empty string is returned.
QGeoCoordinate::CoordinateType QGeoCoordinate::type() const▲
Returns the type of this coordinate.
QGeoCoordinate &QGeoCoordinate::operator=(const QGeoCoordinate &other)▲
Assigns other to this coordinate and returns a reference to this coordinate.
[since 6.2] QGeoCoordinate &QGeoCoordinate::operator=(QGeoCoordinate &&other)▲
Move-assigns other to this coordinate and returns a reference to this coordinate.
The moved-from QGeoCoordinate object can only be destroyed or assigned to. The effect of calling other functions than the destructor or one of the assignment operators is undefined.
This function was introduced in Qt 6.2.
Related Non-Members▲
bool operator!=(const QGeoCoordinate &lhs, const QGeoCoordinate &rhs)▲
Returns true if latitude, longitude, or altitude of the lhs coordinate are not identical to those of the rhs coordinate. Otherwise returns false.
QDataStream &operator<<(QDataStream &stream, const QGeoCoordinate &coordinate)▲
bool operator==(const QGeoCoordinate &lhs, const QGeoCoordinate &rhs)▲
Returns true if the latitude, longitude and altitude of the lhs coordinate are the same as those of the rhs coordinate. Otherwise returns false.
The longitude will be ignored if the latitude is +/- 90 degrees.
QDataStream &operator>>(QDataStream &stream, QGeoCoordinate &coordinate)▲
Reads a coordinate from the specified stream into the given coordinate.
See Also▲
See also Serializing Qt Data Types