1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtLocation module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qdeclarativegeomapitemgroup_p.h"
#include "qdeclarativegeomapitembase_p.h"
#include "qdeclarativegeomap_p.h"
QT_BEGIN_NAMESPACE
/*!
\qmltype MapItemGroup
\instantiates QDeclarativeGeoMapItemGroup
\inqmlmodule QtLocation
\ingroup qml-QtLocation5-maps
\since QtLocation 5.9
\brief The MapItemGroup type is a container for map items.
Its purpose is to enable code modularization by allowing the usage
of qml files containing map elements related to each other, and
the associated bindings.
\note The release of this API with Qt 5.9 is a Technology Preview.
\section2 Example Usage
The following snippet shows how to use a MapItemGroup to create a MapCircle, centered at
the coordinate (63, -18) with a radius of 100km, filled in red, surrounded by an ondulated green border,
both contained in a semitransparent blue circle with a MouseArea that moves the whole group.
This group is defined in a separate file named PolygonGroup.qml:
\code
import QtQuick 2.4
import QtPositioning 5.6
import QtLocation 5.9
MapItemGroup {
id: itemGroup
property alias position: mainCircle.center
property var radius: 100 * 1000
property var borderHeightPct : 0.3
MapCircle {
id: mainCircle
center : QtPositioning.coordinate(40, 0)
radius: itemGroup.radius * (1.0 + borderHeightPct)
opacity: 0.05
visible: true
color: 'blue'
MouseArea{
anchors.fill: parent
drag.target: parent
id: maItemGroup
}
}
MapCircle {
id: groupCircle
center: itemGroup.position
radius: itemGroup.radius
color: 'crimson'
onCenterChanged: {
groupPolyline.populateBorder();
}
}
MapPolyline {
id: groupPolyline
line.color: 'green'
line.width: 3
function populateBorder() {
groupPolyline.path = [] // clearing the path
var waveLength = 8.0;
var waveAmplitude = groupCircle.radius * borderHeightPct;
for (var i=0; i <= 360; i++) {
var wavePhase = (i/360.0 * 2.0 * Math.PI )* waveLength
var waveHeight = (Math.cos(wavePhase) + 1.0) / 2.0
groupPolyline.addCoordinate(groupCircle.center.atDistanceAndAzimuth(groupCircle.radius + waveAmplitude * waveHeight , i))
}
}
Component.onCompleted: {
populateBorder()
}
}
}
\endcode
PolygonGroup.qml is now a reusable component that can then be used in a Map as:
\code
Map {
id: map
PolygonGroup {
id: polygonGroup
position: QtPositioning.coordinate(63,-18)
}
}
\endcode
\image api-mapitemgroup.png
*/
QDeclarativeGeoMapItemGroup::QDeclarativeGeoMapItemGroup(QQuickItem *parent)
: QQuickItem(parent), m_quickMap(nullptr)
{
connect(this, &QQuickItem::opacityChanged,
this, &QDeclarativeGeoMapItemGroup::mapItemOpacityChanged);
}
QDeclarativeGeoMapItemGroup::~QDeclarativeGeoMapItemGroup()
{
}
void QDeclarativeGeoMapItemGroup::setParentGroup(QDeclarativeGeoMapItemGroup &parentGroup)
{
m_parentGroup = &parentGroup;
connect(m_parentGroup, &QDeclarativeGeoMapItemGroup::mapItemOpacityChanged,
this, &QDeclarativeGeoMapItemGroup::mapItemOpacityChanged);
}
void QDeclarativeGeoMapItemGroup::setQuickMap(QDeclarativeGeoMap *quickMap)
{
if (!quickMap && m_quickMap)
m_quickMap->disconnect(this);
m_quickMap = quickMap;
if (m_quickMap) {
onMapSizeChanged();
connect(m_quickMap, &QQuickItem::widthChanged, this, &QDeclarativeGeoMapItemGroup::onMapSizeChanged);
connect(m_quickMap, &QQuickItem::heightChanged, this, &QDeclarativeGeoMapItemGroup::onMapSizeChanged);
}
}
QDeclarativeGeoMap *QDeclarativeGeoMapItemGroup::quickMap() const
{
return m_quickMap;
}
qreal QDeclarativeGeoMapItemGroup::mapItemOpacity() const
{
return ((m_parentGroup) ? m_parentGroup->mapItemOpacity() : 1.0) * opacity();
}
void QDeclarativeGeoMapItemGroup::classBegin()
{
QQuickItem::classBegin();
}
void QDeclarativeGeoMapItemGroup::componentComplete()
{
QQuickItem::componentComplete();
// In certain cases the parent won't be set via the constructor, but rather later on
// during the instantiation/incubation process.
// Therefore calling setParentGroup here, when the parent is known.
// The childrenChanged use case to handle dynamically-added items is currently unsupported.
const QList<QQuickItem *> &quickKids = childItems();
for (QQuickItem *k : quickKids) {
QDeclarativeGeoMapItemGroup *childGroup
= qobject_cast<QDeclarativeGeoMapItemGroup *>(k);
if (childGroup) {
childGroup->setParentGroup(*this);
continue;
}
QDeclarativeGeoMapItemBase *childItem
= qobject_cast<QDeclarativeGeoMapItemBase *>(k);
if (childItem) {
childItem->setParentGroup(*this);
continue;
}
}
}
void QDeclarativeGeoMapItemGroup::onMapSizeChanged()
{
setWidth(m_quickMap->width());
setHeight(m_quickMap->height());
}
QT_END_NAMESPACE
|
