Add QGeoJson: a GeoJSON parser

Add a Class to convert a GeoJSON document to a QVariantList ready to be
used as Model in a MapItemView. It comes with autotests, example and
detailed documentation.

[ChangeLog][QtLocation] Added a GeoJSON parser which can be used to
annotate maps with tracks, polygonal boundaries, etc.

Fixes: QTBUG-64111
Change-Id: Ib06d3902a052f69f75ae40be5c9ab56023cad916
Reviewed-by: Paolo Angelelli <paolo.angelelli@qt.io>

1 files changed, 163 insertions, 0 deletions

diff --git a/examples/location/geojson_viewer/main.qml b/examples/location/geojson_viewer/main.qml
new file mode 100644
index 00000000..cc3fbd3f
--- /dev/null
+++ b/examples/location/geojson_viewer/main.qml
@@ -0,0 +1,163 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Copyright (C) 2018 Julian Sherollari <jdotsh@gmail.com>
+** 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 2.11
+import QtQuick.Controls 1.4
+import QtQuick.Controls.Styles 1.4
+import QtQuick.Dialogs 1.3
+import QtQuick.Layouts 1.11
+import QtQuick.Window 2.11
+import QtPositioning 5.12
+import QtLocation 5.12
+import Qt.labs.qmlmodels 1.0
+import Qt.GeoJson 1.0
+
+ApplicationWindow {
+    visible: true
+    width: 1024
+    height: 1024
+    menuBar: mainMenu
+    title: qsTr("GeoJSON Viewer")
+
+    FileDialog {
+        visible: false
+        id: fileDialog
+        title: "Please choose a GeoJSON file"
+        folder: shortcuts.home
+        onAccepted: {
+            geoJsoner.load(fileDialog.fileUrl)
+        }
+    }
+
+    FileDialog {
+        selectExisting : false
+        visible: false
+        id: fileWriteDialog
+        title: "Write your geometry to a file"
+        folder: shortcuts.home
+        onAccepted: {
+            geoJsoner.dumpGeoJSON(geoJsoner.toGeoJson(miv), fileWriteDialog.fileUrl);
+        }
+    }
+
+    FileDialog {
+        selectExisting : false
+        visible: false
+        id: debugWriteDialog
+        title: "Write Qvariant debug view"
+        folder: shortcuts.home
+        onAccepted: {
+            geoJsoner.writeDebug(geoJsoner.toGeoJson(miv), debugWriteDialog.fileUrl);
+        }
+    }
+
+    MenuBar {
+        id: mainMenu
+
+        Menu {
+            title: "GeoJSON"
+            id : geoJsonMenu
+            MenuItem {
+                text: "Import"
+                shortcut: "Ctrl+I"
+                id : geoJsonMenuOpen
+                onTriggered: {
+                    fileDialog.open()
+                }
+            }
+            MenuItem {
+                text: "Export"
+                shortcut: "Ctrl+E"
+                id : geoJsonWrite
+                 onTriggered: {
+                    fileWriteDialog.open()
+                }
+            }
+        }
+        Menu {
+            title: "Debug"
+            id : debugMenu
+            MenuItem {
+                text: "Print debug data to file"
+                shortcut: "Ctrl+D"
+                id : debugMenuWrite
+                onTriggered: {
+                    debugWriteDialog.open()
+                }
+            }
+            MenuItem {
+                text: "Print debug data"
+                onTriggered: {
+                    geoJsoner.print(miv)
+                }
+            }
+        }
+
+    }
+
+    GeoJsoner {
+        id: geoJsoner
+    }
+
+    Map {
+        id: map
+        anchors.fill: parent
+        center: QtPositioning.coordinate(43.59, 13.50) // Starting coordinates: Ancona, the city where I am studying :)
+        plugin: Plugin { name: "mapboxgl" }
+        zoomLevel: 4
+
+        MapItemView {
+            id: miv
+            model: geoJsoner.model
+            delegate: GeoJsonDelegate {}
+        }
+    }
+}