CircularSurveyMapVisual.qml

/****************************************************************************
 *
 *   (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
 *
 * QGroundControl is licensed according to the terms in the file
 * COPYING.md in the root of the source code directory.
 *
 ****************************************************************************/

import QtQuick          2.3
import QtQuick.Controls 1.2
import QtLocation       5.3
import QtPositioning    5.3

import QGroundControl               1.0
import QGroundControl.ScreenTools   1.0
import QGroundControl.Palette       1.0
import QGroundControl.Controls      1.0
import QGroundControl.FlightMap     1.0

/// Survey Complex Mission Item visuals
Item {
    id: _root

    property var map        ///< Map control to place item in
    property var qgcView    ///< QGCView to use for popping dialogs

    property var _missionItem:      object
    property var _generator: _missionItem.generator

    property var _transectsComponent: undefined
    property var _entryCoordinate: undefined
    property var _exitCoordinate: undefined
    property var _generatorVisuals: undefined

    property bool _isCurrentItem: _missionItem.isCurrentItem

    signal clicked(int sequenceNumber)

    Component.onCompleted: {
        _addEntryCoordinate()
        _addExitCoordinate()
        _addTransectsComponent()
        _addGeneratorVisuals()
    }

    Component.onDestruction: {
        _destroyEntryCoordinate()
        _destroyExitCoordinate()
        _destroyTransectsComponent()
        _destroyGeneratorVisuals()
    }

    on_GeneratorChanged: {
        _destroyGeneratorVisuals()
        _addGeneratorVisuals()
    }

    // Transect lines
    Component {
        id: visualTransectsComponent

        MapPolyline {
            property var transects: _missionItem.visualTransectPoints
            line.color: "white"
            line.width: 2
            path:       transects.length > 0 ? transects : []
        }
    }

    // Entry point
    Component {
        id: entryPointComponent

        MapQuickItem {
            anchorPoint.x:  sourceItem.anchorPointX
            anchorPoint.y:  sourceItem.anchorPointY
            z:              QGroundControl.zOrderMapItems
            coordinate:     _missionItem.coordinate
            visible:        _missionItem.exitCoordinate.isValid

            sourceItem: MissionItemIndexLabel {
                index:      _missionItem.sequenceNumber
                label:      "Entry"
                checked:    _missionItem.isCurrentItem
                onClicked:  _root.clicked(_missionItem.sequenceNumber)
            }
        }
    }

    // Exit point
    Component {
        id: exitPointComponent

        MapQuickItem {
            anchorPoint.x:  sourceItem.anchorPointX
            anchorPoint.y:  sourceItem.anchorPointY
            z:              QGroundControl.zOrderMapItems
            coordinate:     _missionItem.exitCoordinate
            visible:        _missionItem.exitCoordinate.isValid

            sourceItem: MissionItemIndexLabel {
                index:      _missionItem.lastSequenceNumber
                label:      "Exit"
                checked:    _missionItem.isCurrentItem
                onClicked:  _root.clicked(_missionItem.sequenceNumber)
            }
        }
    }

    // Generator visuals
    function _addGeneratorVisuals(){
        if (_generator.mapVisualQml && !_generatorVisuals) {
            var component = Qt.createComponent(_generator.mapVisualQml)
            if (component.status === Component.Error) {
                console.log("Error loading Qml: ",
                            _generator.mapVisualQml, component.errorString())
            } else {
                _generatorVisuals =
                        component.createObject(_root, {
                                                   "map": _root.map,
                                                   "qgcView": _root.qgcView ,
                                                   "generator": _root._generator,
                                                   "checked": Qt.binding(
                                                                  function(){
                                                                      return _root._isCurrentItem
                                                                  })
                                               })
                _generatorVisuals.clicked.connect(
                            function(){_root.clicked(_missionItem.sequenceNumber)})
            }
        }
    }

    function _destroyGeneratorVisuals(){
        if(_generatorVisuals){
            _generatorVisuals.destroy()
            _generatorVisuals = undefined
        }
    }

    function _addTransectsComponent(){
        if (!_transectsComponent){
            _transectsComponent = visualTransectsComponent.createObject(_root)
            map.addMapItem(_transectsComponent)
        }
    }

    function _addExitCoordinate(){
        if (!_exitCoordinate){
            _exitCoordinate = exitPointComponent.createObject(_root)
            map.addMapItem(_exitCoordinate)
        }
    }

    function _addEntryCoordinate(){
        if (!_entryCoordinate){
            _entryCoordinate = entryPointComponent.createObject(_root)
            map.addMapItem(_entryCoordinate)
        }
    }

    function _destroyEntryCoordinate(){
        if (_entryCoordinate){
            map.removeMapItem(_entryCoordinate)
            _entryCoordinate.destroy()
            _entryCoordinate = undefined
        }
    }

    function _destroyExitCoordinate(){
        if (_exitCoordinate){
            map.removeMapItem(_exitCoordinate)
            _exitCoordinate.destroy()
            _exitCoordinate = undefined
        }
    }

    function _destroyTransectsComponent(){
        if (_transectsComponent){
            map.removeMapItem(_transectsComponent)
            _transectsComponent.destroy()
            _transectsComponent = undefined
        }
    }


}