QtMobility Reference Documentation

Contents

QML MapPolyline Element

The MapPolyline element displays a polyline on a map. More...

  • List of all members, including inherited members
  • Properties

    Methods

    Detailed Description

    The polyline is specified in terms of an ordered list of coordinates. Any invalid coordinates in the list will be ignored.

    If the list contains less than 2 valid coordinates the polyline will not be displayed.

    Simplistic example to illustrate, this element could be defined in Map body:

                 MapPolyline {
                     id: polyline
                     border {color: "red"; width: 4}
                     Coordinate {
                         id: polylineTopLeftCoordinate
                         latitude: -28.35
                         longitude: 153.4
                     }
                     Coordinate {
                         id: polylineRightCoordinate
                         latitude: -28.34
                         longitude: 153.45
                     }
                     Coordinate {
                         id: polylineBottomLeftCoordinate
                         latitude: -28.33
                         longitude: 153.4
                     }
                     onPathChanged: {
                         console.log('Polyline pathChanged signal received')
                     }
                 }

    The MapPolyline element is part of the QtMobility.location 1.2 module.

    Property Documentation

    border.width : int

    border.color : color

    These properties hold the width and color used to draw the border of the circle.

    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.

    This documentation was introduced in Qt Mobility Mobility 1.2.


    defaultpath : list<Coordinate>

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

    This documentation was introduced in Qt Mobility Mobility 1.2.


    visible : bool

    This property holds a boolean corresponding to whether or not the polyline is visible.

    This documentation was introduced in Qt Mobility Mobility 1.2.


    z : int

    This property holds the z-value of the polyline.

    Map objects are drawn in z-value order, and objects with the same z-value will be drawn in insertion order.

    This documentation was introduced in Qt Mobility Mobility 1.2.


    Method Documentation

    MapPolyline::addCoordinate ( Coordinate )

    Adds coordinate to the path. The resulting path is derived from values at the time of assignment, meaning that later changes in values are not reflected in the path.

    A basic example is to draw the path where one has been:

         PositionSource {
             id: myPositionSource
             active: true
             nmeaSource: "nmealog.txt"
             updateInterval: 2000
             onPositionChanged: {
                 console.log("Position changed in PositionSource")
                 myPathPolyline.addCoordinate(position.coordinate)
             }
         }

    This documentation was introduced in Qt Mobility Mobility 1.2.

    See also removeCoordinate.


    MapPolyline::removeCoordinate ( Coordinate )

    Remove coordinate from the path. If there are multiple instances of the same coordinate, the one added last is removed. Removed Coordinate is not deleted.

                 onButton2Clicked: {
                     polyline.removeCoordinate(map.center)
                 }

    If more finetuned control is needed, one can also iterate and/or use the inherent index property of the path list.

                 onButton1Clicked: {
                     for (var index = 0; index < polyline.path.length; index++)  {
                         console.log("Index, latitude:" + index + " , " + polyline.path[index].latitude);
                     }
                     polyline.removeCoordinate(polyline.path[2])
                 }

    This documentation was introduced in Qt Mobility Mobility 1.2.

    See also addCoordinate.