Qt 5.8 | Qt Location | Places (QML) | MapComponent.qml Example File

Qt 5.8.0 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 5.6
      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
              }
          }
      }