georectangle QML Basic Type

georectangle type is a geoshape that represents a rectangular geographic area. The type is direct representation of a QGeoRectangle . It is defined by a pair of coordinates which represent the top-left and bottom-right corners of the georectangle . The coordinates are accessible from the topLeft and bottomRight 属性。

A georectangle is considered invalid if the top-left or bottom-right coordinates are invalid or if the top-left coordinate is south of the bottom-right coordinate.

The coordinates of the four corners of the georectangle can be accessed with the topLeft , topRight , bottomLeft and bottomRight attributes. The center attribute can be used to get the coordinate of the center of the georectangle 。 width and height attributes can be used to get the width and height of the georectangle in degrees. Setting one of these attributes will cause the other attributes to be adjusted accordingly.

局限性

A georectangle can never cross the poles.

If the height or center of a georectangle is adjusted such that it would cross one of the poles the height is modified such that the georectangle touches but does not cross the pole and that the center coordinate is still in the center of the georectangle .

用法范例

Use properties of type var to store a georectangle . To create a georectangle 值，使用 QtPositioning.rectangle() 函数：

import QtPositioning
Item {
    property var region: QtPositioning.rectangle(QtPositioning.coordinate(-27.5, 153.1), QtPositioning.coordinate(-27.6, 153.2))
}

When integrating with C++, note that any QGeoRectangle value passed into QML from C++ is automatically converted into a georectangle value, and vice-versa.

特性

bottomLeft

coordinate bottomLeft

This property holds the bottom left coordinate of this georectangle.

bottomRight

coordinate bottomRight

This property holds the bottom right coordinate of this georectangle.

center

coordinate center

This property holds the center coordinate of this georectangle. For more details see QGeoRectangle::setCenter() .

height

double height

This property holds the height of this georectangle (in degrees). For more details see QGeoRectangle::setHeight() .

注意： If the georectangle is invalid, it is not possible to set the height. QtPositioning releases prior to Qt 5.5 permitted the setting of the height even on invalid georectangles.

topLeft

coordinate topLeft

This property holds the top left coordinate of this georectangle.

topRight

coordinate topRight

This property holds the top right coordinate of this georectangle.

width

double width

This property holds the width of this georectangle (in degrees). For more details see QGeoRectangle::setWidth() .

注意： If the georectangle is invalid, it is not possible to set the width. QtPositioning releases prior to Qt 5.5 permitted the setting of the width even on invalid georectangles.