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
|
// Boost.Geometry (aka GGL, Generic Geometry Library)
//
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Qt World Mapper Example
// Qt is a well-known and often used platform independent windows library
// To build and run this example:
// 1) download (from http://qt.nokia.com), configure and make QT
// 2) if necessary, adapt Qt clause in include path (note there is a Qt property sheet)
#include <fstream>
#include <QtGui>
#include <QWidget>
#include <QObject>
#include <QPainter>
#include <boost/foreach.hpp>
#include <boost/geometry/geometry.hpp>
#include <boost/geometry/geometries/geometries.hpp>
#include <boost/geometry/geometries/multi_geometries.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/register/point.hpp>
#include <boost/geometry/geometries/register/ring.hpp>
#include <boost/geometry/extensions/algorithms/selected.hpp>
// Adapt a QPointF such that it can be handled by Boost.Geometry
BOOST_GEOMETRY_REGISTER_POINT_2D_GET_SET(QPointF, double, cs::cartesian, x, y, setX, setY)
// Adapt a QPolygonF as well.
// A QPolygonF has no holes (interiors) so it is similar to a Boost.Geometry ring
BOOST_GEOMETRY_REGISTER_RING(QPolygonF)
typedef boost::geometry::model::d2::point_xy<double> point_2d;
typedef boost::geometry::model::multi_polygon
<
boost::geometry::model::polygon<point_2d>
> country_type;
class WorldMapper : public QWidget
{
public:
WorldMapper(std::vector<country_type> const& countries, boost::geometry::model::box<point_2d> const& box)
: m_countries(countries)
, m_box(box)
{
setPalette(QPalette(QColor(200, 250, 250)));
setAutoFillBackground(true);
}
protected:
void paintEvent(QPaintEvent*)
{
map_transformer_type transformer(m_box, this->width(), this->height());
QPainter painter(this);
painter.setBrush(Qt::green);
painter.setRenderHint(QPainter::Antialiasing);
BOOST_FOREACH(country_type const& country, m_countries)
{
typedef boost::range_value<country_type>::type polygon_type;
BOOST_FOREACH(polygon_type const& polygon, country)
{
typedef boost::geometry::ring_type<polygon_type>::type ring_type;
ring_type const& ring = boost::geometry::exterior_ring(polygon);
// This is the essention:
// Directly transform from a multi_polygon (ring-type) to a QPolygonF
QPolygonF qring;
boost::geometry::transform(ring, qring, transformer);
painter.drawPolygon(qring);
}
}
}
private:
typedef boost::geometry::strategy::transform::map_transformer
<
double, 2, 2,
true, true
> map_transformer_type;
std::vector<country_type> const& m_countries;
boost::geometry::model::box<point_2d> const& m_box;
};
class MapperWidget : public QWidget
{
public:
MapperWidget(std::vector<country_type> const& countries, boost::geometry::model::box<point_2d> const& box, QWidget *parent = 0)
: QWidget(parent)
{
WorldMapper* mapper = new WorldMapper(countries, box);
QPushButton *quit = new QPushButton(tr("Quit"));
quit->setFont(QFont("Times", 18, QFont::Bold));
connect(quit, SIGNAL(clicked()), qApp, SLOT(quit()));
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(mapper);
layout->addWidget(quit);
setLayout(layout);
}
};
// ----------------------------------------------------------------------------
// Read an ASCII file containing WKT's
// ----------------------------------------------------------------------------
template <typename Geometry, typename Box>
inline void read_wkt(std::string const& filename, std::vector<Geometry>& geometries, Box& box)
{
std::ifstream cpp_file(filename.c_str());
if (cpp_file.is_open())
{
while (! cpp_file.eof() )
{
std::string line;
std::getline(cpp_file, line);
if (! line.empty())
{
Geometry geometry;
boost::geometry::read_wkt(line, geometry);
geometries.push_back(geometry);
boost::geometry::expand(box, boost::geometry::return_envelope<Box>(geometry));
}
}
}
}
int main(int argc, char *argv[])
{
std::vector<country_type> countries;
boost::geometry::model::box<point_2d> box;
boost::geometry::assign_inverse(box);
read_wkt("../data/world.wkt", countries, box);
QApplication app(argc, argv);
MapperWidget widget(countries, box);
widget.setWindowTitle("Boost.Geometry for Qt - Hello World!");
widget.setGeometry(50, 50, 800, 500);
widget.show();
return app.exec();
}
|
