MapComponent.qml Example File

places/items/MapComponent.qml
 /****************************************************************************
 **
 ** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, 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 5.6
 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
         }
     }
 }