The QGeoPolygon class defines a geographic polygon. 更多...
头: | #include <QGeoPolygon> |
CMake: |
find_package(Qt6 COMPONENTS Positioning REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Positioning) |
qmake: | QT += positioning |
Since: | Qt 5.10 |
继承: | QGeoShape |
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 |
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 .
Constructs a new geo polygon from the contents of other .
Constructs a new geo polygon from the contents of other .
Constructs a new geo polygon from the coordinates specified in path .
Constructs a new, empty geo polygon.
赋值 other to this geo polygon and returns a reference to this geo polygon.
Destroys this polygon.
[invokable]
void
QGeoPolygon::
addCoordinate
(const
QGeoCoordinate
&
coordinate
)
追加 coordinate to the polygon.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
[invokable, since 5.12]
void
QGeoPolygon::
addHole
(const
QVariant
&
holePath
)
设置 holePath for a hole inside the polygon. The hole is a QVariant 包含 QList < QGeoCoordinate >.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
该函数在 Qt 5.12 引入。
[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 >.
该函数在 Qt 5.12 引入。
[invokable]
bool
QGeoPolygon::
containsCoordinate
(const
QGeoCoordinate
&
coordinate
) const
Returns true if the polygon's perimeter contains coordinate as one of the elements.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
[invokable]
QGeoCoordinate
QGeoPolygon::
coordinateAt
(
qsizetype
index
) const
Returns the coordinate at index .
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
[invokable, since 5.12]
const
QVariantList
QGeoPolygon::
hole
(
qsizetype
index
) const
返回 QVariant 包含 QList < QGeoCoordinate > which represents the hole at index .
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
该函数在 Qt 5.12 引入。
[since 5.12]
const
QList
<
QGeoCoordinate
> QGeoPolygon::
holePath
(
qsizetype
index
) const
返回 QList < QGeoCoordinate > which represents the hole at index .
该函数在 Qt 5.12 引入。
[invokable, since 5.12]
qsizetype
QGeoPolygon::
holesCount
() const
Returns the number of holes.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
该函数在 Qt 5.12 引入。
[invokable]
void
QGeoPolygon::
insertCoordinate
(
qsizetype
index
, const
QGeoCoordinate
&
coordinate
)
插入 coordinate at the specified index .
注意: 此函数可以被援引,通过元对象系统和从 QML。见 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.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
[since QtPositioning 5.12]
const
QList
<
QGeoCoordinate
> &QGeoPolygon::
perimeter
() const
Returns all the elements of the polygon's perimeter.
注意: Getter function for property perimeter.
This function was introduced in QtPositioning 5.12.
另请参阅 setPerimeter ().
[invokable]
void
QGeoPolygon::
removeCoordinate
(const
QGeoCoordinate
&
coordinate
)
Removes the last occurrence of coordinate from the polygon.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
[invokable]
void
QGeoPolygon::
removeCoordinate
(
qsizetype
index
)
Removes element at position index from the polygon.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
[invokable, since 5.12]
void
QGeoPolygon::
removeHole
(
qsizetype
index
)
Removes element at position index from the list of holes.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
该函数在 Qt 5.12 引入。
[invokable]
void
QGeoPolygon::
replaceCoordinate
(
qsizetype
index
, const
QGeoCoordinate
&
coordinate
)
Replaces the path element at the specified index with coordinate .
注意: 此函数可以被援引,通过元对象系统和从 QML。见 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 .
注意: Setter 函数对于特性 perimeter .
This function was introduced in QtPositioning 5.12.
另请参阅 perimeter ().
[invokable, since 5.10]
qsizetype
QGeoPolygon::
size
() const
Returns the number of elements in the polygon.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
该函数在 Qt 5.10 引入。
[invokable]
QString
QGeoPolygon::
toString
() const
Returns the geo polygon properties as a string.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 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.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 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.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
另请参阅 translate ().