The QGeoCoordinate class defines a geographical position on the surface of the Earth. 更多...
| 头： | #include <QGeoCoordinate> |
| qmake: | QT += positioning |
| Since: | Qt 5.2 |
该类在 Qt 5.2 引入。
| enum | CoordinateFormat { Degrees, DegreesWithHemisphere, DegreesMinutes, DegreesMinutesWithHemisphere, DegreesMinutesSeconds, DegreesMinutesSecondsWithHemisphere } |
| enum | CoordinateType { InvalidCoordinate, Coordinate2D, Coordinate3D } |
| QGeoCoordinate (const QGeoCoordinate & other ) | |
| QGeoCoordinate (double latitude , double longitude , double altitude ) | |
| QGeoCoordinate (double latitude , double longitude ) | |
| QGeoCoordinate () | |
| QGeoCoordinate & | operator= (const QGeoCoordinate & other ) |
| ~QGeoCoordinate () | |
| double | altitude () const |
| QGeoCoordinate | atDistanceAndAzimuth (qreal distance , qreal azimuth , qreal distanceUp = 0.0) const |
| qreal | azimuthTo (const QGeoCoordinate & other ) const |
| qreal | distanceTo (const QGeoCoordinate & other ) const |
| bool | isValid () const |
| double | latitude () const |
| double | longitude () const |
| void | setAltitude (double altitude ) |
| void | setLatitude (double latitude ) |
| void | setLongitude (double longitude ) |
| QString | toString (QGeoCoordinate::CoordinateFormat format = DegreesMinutesSecondsWithHemisphere) const |
| QGeoCoordinate::CoordinateType | type () const |
| bool | operator!= (const QGeoCoordinate & other ) const |
| bool | operator== (const QGeoCoordinate & other ) const |
| QDataStream & | operator<< (QDataStream & stream , const QGeoCoordinate & coordinate ) |
| QDataStream & | operator>> (QDataStream & stream , QGeoCoordinate & coordinate ) |
A QGeoCoordinate is defined by latitude, longitude, and optionally, altitude.
使用 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 () 和 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 .
Defines the possible formatting options for toString ().
| 常量 | 值 | 描述 |
|---|---|---|
QGeoCoordinate::Degrees
|
0
|
Returns a string representation of the coordinates in decimal degrees format. |
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. |
QGeoCoordinate::DegreesMinutes
|
2
|
Returns a string representation of the coordinates in degrees-minutes format. |
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. |
QGeoCoordinate::DegreesMinutesSeconds
|
4
|
Returns a string representation of the coordinates in degrees-minutes-seconds format. |
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. |
另请参阅 toString ().
Defines the types of a coordinate.
| 常量 | 值 | 描述 |
|---|---|---|
QGeoCoordinate::InvalidCoordinate
|
0
|
An invalid coordinate. A coordinate is invalid if its latitude or longitude values are invalid. |
QGeoCoordinate::Coordinate2D
|
1
|
A coordinate with valid latitude and longitude values. |
QGeoCoordinate::Coordinate3D
|
2
|
A coordinate with valid latitude and longitude values, and also an altitude value. |
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.
该特性在 Qt 5.5 引入。
访问函数：
| double | altitude () const |
| void | setAltitude (double altitude ) |
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.
该特性在 Qt 5.5 引入。
访问函数：
| bool | isValid () const |
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.
该特性在 Qt 5.5 引入。
访问函数：
| double | latitude () const |
| void | setLatitude (double latitude ) |
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.
该特性在 Qt 5.5 引入。
访问函数：
| double | longitude () const |
| void | setLongitude (double longitude ) |
Constructs a coordinate from the contents of other .
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 .
注意， altitude specifies the meters above sea level.
另请参阅 isValid ().
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 .
另请参阅 isValid ().
Constructs a coordinate. The coordinate will be invalid until setLatitude () 和 setLongitude () have been called.
赋值 other to this coordinate and returns a reference to this coordinate.
Destroys the coordinate object.
Returns the altitude (meters above sea level).
The return value is undefined if the altitude has not been set.
注意： getter 函数对于特性 altitude .
另请参阅 setAltitude () 和 type ().
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.
注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .
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 .
注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .
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 .
注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .
返回
true
若
longitude
and
latitude
are valid.
注意： getter 函数对于特性 isValid .
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.
注意： getter 函数对于特性 latitude .
另请参阅 setLatitude () 和 type ().
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.
注意： getter 函数对于特性 longitude .
另请参阅 setLongitude () 和 type ().
Sets the altitude (meters above sea level) to altitude .
注意： setter 函数对于特性 altitude .
另请参阅 altitude ().
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.
注意： setter 函数对于特性 latitude .
另请参阅 latitude ().
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.
注意： setter 函数对于特性 longitude .
另请参阅 longitude ().
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 :
| format 值 | Returned string |
|---|---|
| Degrees | -27.46758°, 153.02789°, 28.1m |
| DegreesWithHemisphere | 27.46758° S, 153.02789° E, 28.1m |
| DegreesMinutes | -27° 28.054', 153° 1.673', 28.1m |
| DegreesMinutesWithHemisphere | 27° 28.054 S', 153° 1.673' E, 28.1m |
| DegreesMinutesSeconds | -27° 28' 3.2", 153° 1' 40.4", 28.1m |
| DegreesMinutesSecondsWithHemisphere | 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.
注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .
Returns the type of this coordinate.
返回
true
if latitude, longitude, or altitude of this coordinate are not identical to
other
.
Returns true if the latitude, longitude and altitude of this coordinate are the same as those of other .
The longitude will be ignored if the latitude is +/- 90 degrees.
写入给定 coordinate 到指定 stream .
另请参阅 序列化 Qt 数据类型 .
Reads a coordinate from the specified stream 进给定 coordinate .
另请参阅 序列化 Qt 数据类型 .
