RectangleItem.qml Example File

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 import QtQuick 2.0
 import QtLocation 5.0

 MapRectangle {

     id: mapRectangle
     color: mousearea.containsMouse ? "lime" : "red"
     opacity: 0.5
     border.width: 2.0
     bottomRight: Coordinate{}
     topLeft: Coordinate{}

     function setGeometry(markers, index){
         topLeft.latitude = Math.max(markers[index].coordinate.latitude, markers[index + 1].coordinate.latitude)
         topLeft.longitude = Math.min(markers[index].coordinate.longitude, markers[index + 1].coordinate.longitude)
         bottomRight.latitude = Math.min(markers[index].coordinate.latitude, markers[index + 1].coordinate.latitude)
         bottomRight.longitude = Math.max(markers[index].coordinate.longitude, markers[index + 1].coordinate.longitude)
     }

     Binding {
         target: mapRectangle
         property: 'border.width'
         value: 60

         when: ((topLeft.latitude == -27.1144) &&
                (topLeft.longitude == 152.6594) &&
                (bottomRight.latitude == -27.7434) &&
                (bottomRight.longitude == 153.3021))
     }

     MapMouseArea {
         anchors.fill:parent
         id: mousearea
         hoverEnabled: false
         drag.target: parent
     }
 }