The QGeoPositionInfo class contains information gathered on a global position, direction and velocity at a particular point in time. 更多...
| 头： | #include <QGeoPositionInfo> |
| CMake: |
find_package(Qt6 COMPONENTS Positioning REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Positioning) |
| qmake: | QT += positioning |
| Since: | Qt 5.2 |
| enum | Attribute { Direction, GroundSpeed, VerticalSpeed, MagneticVariation, HorizontalAccuracy, VerticalAccuracy } |
| QGeoPositionInfo (QGeoPositionInfo && other ) | |
| QGeoPositionInfo (const QGeoPositionInfo & other ) | |
| QGeoPositionInfo (const QGeoCoordinate & coordinate , const QDateTime & timestamp ) | |
| QGeoPositionInfo () | |
| QGeoPositionInfo & | operator= (QGeoPositionInfo && other ) |
| QGeoPositionInfo & | operator= (const QGeoPositionInfo & other ) |
| ~QGeoPositionInfo () | |
| qreal | 属性 (QGeoPositionInfo::Attribute 属性 ) const |
| QGeoCoordinate | coordinate () const |
| bool | hasAttribute (QGeoPositionInfo::Attribute 属性 ) const |
| bool | isValid () const |
| void | removeAttribute (QGeoPositionInfo::Attribute 属性 ) |
| void | setAttribute (QGeoPositionInfo::Attribute 属性 , qreal value ) |
| void | setCoordinate (const QGeoCoordinate & coordinate ) |
| void | setTimestamp (const QDateTime & timestamp ) |
| QDateTime | timestamp () const |
| bool | operator!= (const QGeoPositionInfo & lhs , const QGeoPositionInfo & rhs ) |
| QDataStream & | operator<< (QDataStream & stream , const QGeoPositionInfo & info ) |
| QDataStream & | operator<< (QDataStream & stream , QGeoPositionInfo::Attribute attr ) |
| bool | operator== (const QGeoPositionInfo & lhs , const QGeoPositionInfo & rhs ) |
| QDataStream & | operator>> (QDataStream & stream , QGeoPositionInfo & info ) |
| QDataStream & | operator>> (QDataStream & stream , QGeoPositionInfo::Attribute & attr ) |
A QGeoPositionInfo contains, at a minimum, a geographical coordinate and a timestamp. It may also have heading and speed measurements as well as estimates of the accuracy of the provided data.
另请参阅 QGeoPositionInfoSource .
Defines the attributes for positional information.
| 常量 | 值 | 描述 |
|---|---|---|
QGeoPositionInfo::Direction
|
0
|
The bearing measured in degrees clockwise from true north to the direction of travel. |
QGeoPositionInfo::GroundSpeed
|
1
|
The ground speed, in meters/sec. |
QGeoPositionInfo::VerticalSpeed
|
2
|
The vertical speed, in meters/sec. |
QGeoPositionInfo::MagneticVariation
|
3
|
The angle between the horizontal component of the magnetic field and true north, in degrees. Also known as magnetic declination. A positive value indicates a clockwise direction from true north and a negative value indicates a counter-clockwise direction. |
QGeoPositionInfo::HorizontalAccuracy
|
4
|
The accuracy of the provided latitude-longitude value, in meters. |
QGeoPositionInfo::VerticalAccuracy
|
5
|
The accuracy of the provided altitude value, in meters. |
NMEA protocol also suggests another type of accuracy - PositionAccuracy, which is a 3D accuracy value. Qt does not provide a separate attribute for it. If you need this value, you can calculate it based on the following formula:
PositionAccuracy
2
= HorizontalAccuracy
2
+ VerticalAccuracy
2
[since 6.2]
QGeoPositionInfo::
QGeoPositionInfo
(
QGeoPositionInfo
&&
other
)
Creates a QGeoPositionInfo object by moving from other .
Note that a moved-from QGeoPositionInfo can only be destroyed or assigned to. The effect of calling other functions than the destructor or one of the assignment operators is undefined.
该函数在 Qt 6.2 引入。
Creates a QGeoPositionInfo with the values of other .
Creates a QGeoPositionInfo for the given coordinate and timestamp .
Creates an invalid QGeoPositionInfo object.
另请参阅 isValid ().
[since 6.2]
QGeoPositionInfo
&QGeoPositionInfo::
operator=
(
QGeoPositionInfo
&&
other
)
Move-assigns the values from other 到此对象。
Note that a moved-from QGeoPositionInfo can only be destroyed or assigned to. The effect of calling other functions than the destructor or one of the assignment operators is undefined.
该函数在 Qt 6.2 引入。
Assigns the values from other 到此 QGeoPositionInfo .
销毁 QGeoPositionInfo 对象。
Returns the value of the specified 属性 as a qreal value.
Returns NaN if the value has not been set.
函数 hasAttribute () should be used to determine whether or not a value has been set for an attribute.
另请参阅 hasAttribute () 和 setAttribute ().
Returns the coordinate for this position.
Returns an invalid coordinate if no coordinate has been set.
另请参阅 setCoordinate ().
返回 true 若指定 属性 is present for this QGeoPositionInfo 对象。
返回 true 若 timestamp () 和 coordinate () values are both valid.
另请参阅 QGeoCoordinate::isValid () 和 QDateTime::isValid ().
移除指定 属性 and its value.
Sets the value for 属性 to value .
另请参阅 属性 ().
Sets the coordinate for this position to coordinate .
另请参阅 coordinate ().
Sets the date and time at which this position was reported to timestamp .
timestamp must be in UTC time.
另请参阅 timestamp ().
Returns the date and time at which this position was reported, in UTC time.
Returns an invalid QDateTime if no date/time value has been set.
另请参阅 setTimestamp ().
返回
true
if any of the
lhs
object's values are not the same as those of
rhs
. Otherwise returns
false
.
写入给定 info 到指定 stream .
另请参阅 序列化 Qt 数据类型 .
写入给定 attr enumeration to the specified stream .
另请参阅 序列化 Qt 数据类型 .
返回
true
if all of the
lhs
object's values are the same as those of
rhs
. Otherwise returns
false
.
Reads a coordinate from the specified stream 进给定 info .
另请参阅 序列化 Qt 数据类型 .
Reads an attribute enumeration from the specified stream info the given attr .
另请参阅 序列化 Qt 数据类型 .