void
on_actionGenerate_triggered()
{
QRectF rect = CGAL::Qt::viewportsBbox(&scene);
CGAL::Qt::Converter<K> convert;
Iso_rectangle_2 isor = convert(rect);
Point_2 center = CGAL::midpoint(isor[0], isor[2]);
Vector_2 offset = center - CGAL::ORIGIN;
double w = isor.xmax() - isor.xmin();
double h = isor.ymax() - isor.ymin();
double radius = (w<h) ? w/2 : h/2;
G pg(radius);
bool ok = false;
const int number_of_points =
QInputDialog::getInteger(this,
tr("Number of random points"),
tr("Enter number of random points"),
100,
0,
(std::numeric_limits<int>::max)(),
1,
&ok);
if(!ok) {
return;
}
// wait cursor
QApplication::setOverrideCursor(Qt::WaitCursor);
points.reserve(points.size() + number_of_points);
for(int i = 0; i < number_of_points; ++i){
points.push_back(*pg + offset);
++pg;
}
// default cursor
QApplication::restoreOverrideCursor();
Q_EMIT( changed());
}
SiteList createArtificialSites(SiteList& sites, Iso_rectangle_2 crect)
{
SiteList artificialSites;
// add artificial sites
SiteList::iterator itr;
for (itr = sites.begin(); itr != sites.end(); ++itr) {
Site_2 site = *itr;
Point_2 point = site.point();
double weight = site.weight();
Point_2 apoint1(2 * crect.xmin() - point.x(), point.y());
Site_2 asite1(apoint1, weight);
Point_2 apoint2(2 * crect.xmax() - point.x(), point.y());
Site_2 asite2(apoint2, weight);
Point_2 apoint3(point.x(), 2 * crect.ymin() - point.y());
Site_2 asite3(apoint3, weight);
Point_2 apoint4(point.x(), 2 * crect.ymax() - point.y());
Site_2 asite4(apoint4, weight);
artificialSites.push_back(asite1);
artificialSites.push_back(asite2);
artificialSites.push_back(asite3);
artificialSites.push_back(asite4);
}
return artificialSites;
}
/*
* create a rectangle based on the specifed one, but enlarge it by amount
*/
Iso_rectangle_2 extend(Iso_rectangle_2 rect, double amount)
{
Iso_rectangle_2 r(rect.xmin()-amount, rect.ymin()-amount,
rect.xmax()+amount, rect.ymax()+amount);
return r;
}
int main(int argc , char* argv[])
{
if (argc < 7) {
std::cerr << "usage: test <input file> <output folder> "
"<format (wkt | geojson | sql)> <weight city> <weight town> <weight village>" << std::endl;
exit(1);
}
char* input = argv[1];
char* outdir = argv[2];
char* format = argv[3];
char* swc = argv[4];
char* swt = argv[5];
char* swv = argv[6];
std::ifstream ifs(input);
assert( ifs );
double wc, wt, wv;
std::istringstream stmc, stmt, stmv;
stmc.str(swc);
stmc >> wc;
stmt.str(swt);
stmt >> wt;
stmv.str(swv);
stmv >> wv;
std::cerr << "using weights: city: " << wc << ", town: " << wt << ", village: " << wv << std::endl;
/*
* prepare data
*/
// we use a ScalingFactor(SF) here to stretch input values at the
// beginning, and divide by SF in the end. This is used because the
// point-generation of the hyperbola class is using some arbitrary
// internal decision thresholds to decide how many points to generate for
// a certain part of the curve. Rule of thumb is: the higher SF the more
// detail is used in approximation of the hyperbolas.
double SF = 4000;
// read in sites from input file
SiteList sites = readSites(ifs, SF, wc, wt, wv);
printSites(sites);
// calculate bounding box of all input sites (and extend it a little).
// Extension is important, because we later add artificial sites which are
// actually mirrored on the bounds of this rectangle. If we did not extend
// some points would lie on the boundary of the bounding box and so would
// their artificial clones. This would complicate the whole stuff a lot :)
Iso_rectangle_2 crect = extend(boundingBox(sites), 0.1*SF);
std::cerr << "rect: " << crect << std::endl;
// a number of artificial sites
SiteList artificialSites = createArtificialSites(sites, crect);
/*
* create Apollonius graph
*/
Apollonius_graph ag;
SiteList::iterator itr;
// add all original sites to the apollonius graph
for (itr = sites.begin(); itr != sites.end(); ++itr) {
Site_2 site = *itr;
ag.insert(site);
}
// add all artificial sites to the apollonius graph
for (itr = artificialSites.begin(); itr != artificialSites.end(); ++itr) {
Site_2 site = *itr;
ag.insert(site);
}
// validate the Apollonius graph
assert( ag.is_valid(true, 1) );
std::cerr << std::endl;
/*
* create polygons from cells
*/
// we want an identifier for each vertex within the iteration.
// this is a loop iteration counter
int vertexIndex = 0;
// for each vertex in the apollonius graph (this are the sites)
for (All_vertices_iterator viter = ag.all_vertices_begin ();
viter != ag.all_vertices_end(); ++viter) {
// get the corresponding site
Site_2 site = viter->site();
Point_2 point = site.point();
// ignore artifical sites, detect them by their position
if (!CGAL::do_intersect(crect, point)) {
continue;
}
std::cerr << "vertex " << ++vertexIndex << std::endl;
// we than circulate all incident edges. By obtaining the respective
// dual of each edge, we get access to the objects forming the boundary
// of each voronoi cell in a proper order.
Edge_circulator ecirc = ag.incident_edges(viter), done(ecirc);
// this is where we store the polylines
std::vector<PointList> polylines;
// for each incident edge
do {
// the program may fail in certain situations without this test.
// acutally !is_infinite(edge) is a precondition in ag.dual(edge).
if (ag.is_infinite(*ecirc)) {
continue;
}
// NOTE: for this to work, we had to make public the dual function in ApolloniusGraph
// change line 542 in "Apollonius_graph_2.h" from "private:" to "public:"
Object_2 o = ag.dual(*ecirc);
handleDual(o, crect, polylines);
} while(++ecirc != done);
PointList polygon = buildPolygon(site, polylines);
for (int i = 0; i < polygon.size(); i++) {
Point_2& p = polygon.at(i);
p = Point_2(p.x()/SF, p.y()/SF);
}
if(std::string(format) == "geojson") {
writeGeoJSON(site, polygon, outdir);
} else if(std::string(format) == "sql") {
writeSQL(site, polygon, outdir);
} else {
writeWKT(site, polygon, outdir);
}
// check each point
for (int i = 0; i < polygon.size(); i++) {
Point_2 p = polygon.at(i);
if (p.x() > crect.xmax()/SF || p.x() < crect.xmin()/SF || p.y() > crect.ymax()/SF || p.y() < crect.ymin()/SF) {
std::cerr << "out of bounds" << std::endl;
}
}
}
}
