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
|
// Boost.Geometry
//
// Copyright (c) 2007-2024 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
#include "qt_world_mapper.hpp"
#include "common/read_countries.hpp"
#include <QApplication>
#include <QPainter>
#include <QTime>
#include <QTimer>
#include <boost/geometry/geometries/register/point.hpp>
#include <boost/geometry/geometries/register/ring.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)
qt_world_mapper::qt_world_mapper(std::vector<country_type> const& countries, boost::geometry::model::box<point_2d> const& box, QWidget *parent)
: QWidget(parent)
, m_countries(countries)
, m_box(box)
{
setPalette(QPalette(Qt::blue));
setAutoFillBackground(true);
}
void qt_world_mapper::paintEvent(QPaintEvent *)
{
map_transformer_type transformer(m_box, this->width(), this->height());
QPainter painter(this);
painter.setBrush(Qt::green);
painter.setRenderHint(QPainter::Antialiasing);
for(auto const& country : m_countries)
{
for(auto const& polygon : country)
{
// This is the essention:
// Directly transform from a multi_polygon (ring-type) to a QPolygonF
QPolygonF qring;
boost::geometry::transform(boost::geometry::exterior_ring(polygon), qring, transformer);
painter.drawPolygon(qring);
}
}
}
int main(int argc, char *argv[])
{
const std::string filename = argc > 1 ? argv[1] : "../../../data/world.wkt";
const auto countries = read_countries<country_type>(filename);
if (countries.empty())
{
std::cout << "No countries read" << std::endl;
return 1;
}
const auto box = calculate_envelope<boost::geometry::model::box<point_2d>>(countries);
QApplication app(argc, argv);
qt_world_mapper mapper(countries, box);
mapper.setWindowTitle("Boost.Geometry for Qt - Hello World!");
mapper.setGeometry(100, 100, 1024, 768);
mapper.show();
return app.exec();
}
|
