MapComponent.qml Example File | Qt Location 5.4

- Qt 5.4
- Qt Location
- Places (QML)
- MapComponent.qml Example File
- Qt 5.4.2 Reference Documentation

# MapComponent.qml Example File

places/content/places/MapComponent.qml

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
    **     of its contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    import QtQuick 2.0
    import QtPositioning 5.2
    import QtLocation 5.3
    import QtLocation.examples 5.0

    Map {
        id: map
        zoomLevel: (maximumZoomLevel - minimumZoomLevel)/2
        center {
            // Brisbane
            latitude: -27.5
            longitude: 153
        }

        gesture.flickDeceleration: 3000
        gesture.enabled: true

        property bool followme: false
        property variant scaleLengths: [5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 50000, 100000, 200000, 500000, 1000000, 2000000]

        PositionSource{
            id: positionSource
            active: followme

            onPositionChanged: {
                map.center = positionSource.position.coordinate
            }
        }

        Slider {
            id: zoomSlider;
            minimum: map.minimumZoomLevel;
            maximum: map.maximumZoomLevel;
            opacity: 1
            visible: parent.visible
            z: map.z+1
            anchors {
                bottom: parent.bottom;
                bottomMargin: 15; rightMargin: 10; leftMargin: 90
                left: parent.left
            }
            width: parent.width - anchors.rightMargin - anchors.leftMargin
            value: map.zoomLevel
            onValueChanged: {
                map.zoomLevel = value
            }
        }

        signal coordinatesCaptured(double latitude, double longitude)

        Item {//scale
            id: scale
            parent: zoomSlider.parent
            visible: scaleText.text != "0 m"
            z: map.z
            opacity: 0.6
            anchors {
                bottom: zoomSlider.top;
                bottomMargin: 8;
                left: zoomSlider.left
            }
            Image {
                id: scaleImageLeft
                source: "../../resources/scale_end.png"
                anchors.bottom: parent.bottom
                anchors.left: parent.left
            }
            Image {
                id: scaleImage
                source: "../../resources/scale.png"
                anchors.bottom: parent.bottom
                anchors.left: scaleImageLeft.right
            }
            Image {
                id: scaleImageRight
                source: "../../resources/scale_end.png"
                anchors.bottom: parent.bottom
                anchors.left: scaleImage.right
            }
            Text {
                id: scaleText
                color: "#004EAE"
                horizontalAlignment: Text.AlignHCenter
                anchors.bottom: parent.bottom
                anchors.left: parent.left
                anchors.bottomMargin: 3
                text: "0 m"
                font.pixelSize: 14
            }
            Component.onCompleted: {
                map.calculateScale();
            }
        }

        Timer {
            id: scaleTimer
            interval: 100
            running: false
            repeat: false
            onTriggered: {
                map.calculateScale()
            }
        }

        onCenterChanged:{
            scaleTimer.restart()
            if (map.followme)
                if (map.center != positionSource.position.coordinate) map.followme = false
        }

        onZoomLevelChanged:{
            scaleTimer.restart()
            if (map.followme) map.center = positionSource.position.coordinate
        }

        onWidthChanged:{
            scaleTimer.restart()
        }

        onHeightChanged:{
            scaleTimer.restart()
        }

        Keys.onPressed: {
            if ((event.key == Qt.Key_Plus) || (event.key == Qt.Key_VolumeUp)) {
                map.zoomLevel += 1
            } else if ((event.key == Qt.Key_Minus) || (event.key == Qt.Key_VolumeDown)){
                map.zoomLevel -= 1
            }
        }

        function calculateScale(){
            var coord1, coord2, dist, text, f
            f = 0
            coord1 = map.toCoordinate(Qt.point(0,scale.y))
            coord2 = map.toCoordinate(Qt.point(0+scaleImage.sourceSize.width,scale.y))
            dist = Math.round(coord1.distanceTo(coord2))

            if (dist === 0) {
                // not visible
            } else {
                for (var i = 0; i < scaleLengths.length-1; i++) {
                    if (dist < (scaleLengths[i] + scaleLengths[i+1]) / 2 ) {
                        f = scaleLengths[i] / dist
                        dist = scaleLengths[i]
                        break;
                    }
                }
                if (f === 0) {
                    f = dist / scaleLengths[i]
                    dist = scaleLengths[i]
                }
            }

            text = formatDistance(dist)
            scaleImage.width = (scaleImage.sourceSize.width * f) - 2 * scaleImageLeft.sourceSize.width
            scaleText.text = text
        }

        function roundNumber(number, digits) {
            var multiple = Math.pow(10, digits);
            return Math.round(number * multiple) / multiple;
        }

        function formatTime(sec){
            var value = sec
            var seconds = value % 60
            value /= 60
            value = (value > 1) ? Math.round(value) : 0
            var minutes = value % 60
            value /= 60
            value = (value > 1) ? Math.round(value) : 0
            var hours = value
            if (hours > 0) value = hours + "h:"+ minutes + "m"
            else value = minutes + "min"
            return value
        }

        function formatDistance(meters)
        {
             var dist = Math.round(meters)
             if (dist > 1000 ){
                 if (dist > 100000){
                     dist = Math.round(dist / 1000)
                 }
                 else{
                     dist = Math.round(dist / 100)
                     dist = dist / 10
                 }
                 dist = dist + " km"
             }
             else{
                 dist = dist + " m"
             }
             return dist
        }
    }