MapPolyline QML Type

The MapPolyline type displays a polyline on a map. 更多...

import 语句：	import QtLocation 6.7
Since:	QtLocation 5.0

所有成员列表，包括继承成员
MapPolyline is part of QML Maps Plugin .

特性

autoFadeIn : bool
line
- line.color : color
- line.width : int
path : list<coordinate>
referenceSurface : enum (从 6.5 起)

方法

void addCoordinate ( coordinate )
coordinate containsCoordinate ( coordinate ) (since QtLocation 5.6)
coordinate coordinateAt ( index ) (since QtLocation 5.6)
void insertCoordinate ( index , coordinate ) (since QtLocation 5.6)
int pathLength () (since QtLocation 5.6)
void removeCoordinate ( coordinate )
void removeCoordinate ( index ) (since QtLocation 5.6)
void replaceCoordinate ( index , coordinate ) (since QtLocation 5.6)
void setPath (geopath path )

详细描述

The MapPolyline type displays a polyline on a map, specified in terms of an ordered list of coordinates 。 coordinates on the path cannot be directly changed after being added to the Polyline. Instead, copy the path into a var, modify the copy and reassign the copy back to the path .

var path = mapPolyline.path;
path[0].latitude = 5;
mapPolyline.path = path;

Coordinates can also be added and removed at any time using the addCoordinate and removeCoordinate 方法。

By default, the polyline is displayed as a 1-pixel thick black line. This can be changed using the line.width and line.color 特性。

用法范例

The following snippet shows a MapPolyline with 4 points, making a shape like the top part of a "question mark" (?), near Brisbane, Australia. The line drawn is 3 pixels in width and green in color.

Map {
    MapPolyline {
        line.width: 3
        line.color: 'green'
        path: [
            { latitude: -27, longitude: 153.0 },
            { latitude: -27, longitude: 154.1 },
            { latitude: -28, longitude: 153.5 },
            { latitude: -29, longitude: 153.5 }
        ]
    }
}

特性文档编制

autoFadeIn : bool

This property holds whether the item automatically fades in when zooming into the map starting from very low zoom levels. By default this is true 。把此特性设为 false causes the map item to always have the opacity specified with the QtQuick::Item::opacity property, which is 1.0 by default.

line group
line.color : color
line.width : int

This property is part of the line property group. The line property group holds the width and color used to draw the line.

The width is in pixels and is independent of the zoom level of the map. The default values correspond to a black border with a width of 1 pixel.

For no line, use a width of 0 or a transparent color.

path : list < coordinate >

This property holds the ordered list of coordinates which define the polyline.

referenceSurface : enum [since 6.5]

This property determines the reference surface of the polyline. If it is set to QLocation::ReferenceSurface::Map the polylines vertices are connected with straight lines on the map. If it is set to QLocation::ReferenceSurface::Globe , the vertices are connected following the great circle path, describing the shortest connection of two points on a sphere. Default value is QLocation::ReferenceSurface::Map .

该特性在 Qt 6.5 引入。