- Qt 5.5
- Qt Location
- Places (QML)
- MapComponent.qml Example File
- Qt 5.5.1 Reference Documentation

# MapComponent.qml Example File

places/items/MapComponent.qml

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** 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 The Qt Company Ltd 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 2.5
    import QtQuick.Controls 1.4
    import QtPositioning 5.5
    import QtLocation 5.5
    import "../helper.js" as Helper

    Map {
        id: map
        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]

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

        center {
            // The Qt Company in Oslo
            latitude: 59.9485
            longitude: 10.7686
        }

        gesture.flickDeceleration: 3000
        gesture.enabled: true
        onCopyrightLinkActivated: Qt.openUrlExternally(link)

        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) {
                map.zoomLevel++
            } else if (event.key === Qt.Key_Minus) {
                map.zoomLevel--
            }
        }

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

        Item {
            id: scale
            visible: scaleText.text != "0 m"
            z: map.z + 3
            anchors.bottom: parent.bottom
            anchors.right: parent.right
            anchors.margins: 20
            height: scaleText.height * 2
            width: scaleImage.width

            Image {
                id: scaleImageLeft
                source: "../../resources/scale_end.png"
                anchors.bottom: parent.bottom
                anchors.right: scaleImage.left
            }
            Image {
                id: scaleImage
                source: "../../resources/scale.png"
                anchors.bottom: parent.bottom
                anchors.right: scaleImageRight.left
            }
            Image {
                id: scaleImageRight
                source: "../../resources/scale_end.png"
                anchors.bottom: parent.bottom
                anchors.right: parent.right
            }
            Label {
                id: scaleText
                color: "#004EAE"
                anchors.centerIn: parent
                text: "0 m"
            }
            Component.onCompleted: {
                map.calculateScale();
            }
        }

        MapQuickItem {
            id: poiTheQtComapny
            sourceItem: Rectangle { width: 14; height: 14; color: "#e41e25"; border.width: 2; border.color: "white"; smooth: true; radius: 7 }
            coordinate {
                latitude: 59.9485
                longitude: 10.7686
            }
            opacity:1.0
            anchorPoint: Qt.point(sourceItem.width/2, sourceItem.height/2)
        }

        MapQuickItem {
            sourceItem: Text{
                text: "The Qt Company"
                color:"#242424"
                font.bold: true
                styleColor: "#ECECEC"
                style: Text.Outline
            }
            coordinate: poiTheQtComapny.coordinate
            anchorPoint: Qt.point(-poiTheQtComapny.sourceItem.width * 0.5,poiTheQtComapny.sourceItem.height * 1.5)
        }

        PositionSource{
            id: positionSource
            active: followme

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

        Slider {
            id: zoomSlider;
            z: map.z + 3
            minimumValue: map.minimumZoomLevel;
            maximumValue: map.maximumZoomLevel;
            anchors.margins: 10
            anchors.bottom: scale.top
            anchors.top: parent.top
            anchors.right: parent.right
            orientation : Qt.Vertical
            value: map.zoomLevel
            onValueChanged: {
                map.zoomLevel = value
            }
        }

        MouseArea {
            //workaround for QTBUG-46388
            anchors.fill: parent
        }
    }