// Create a quadrilateral window function of ones (rest is zero) given an Nside, and write to outfile:
// Shape is hard-coded below:
void CreateWindow(std::string outfile, int nside) {
Healpix_Map<MAP_PRECISION> Map;
std::vector<pointing> vertex;
std::vector<int> pixlist;
rangeset<int> pixset;
int npixels, i, count;
// Here you define the vertices of the square in radians (theta, phi):
// top-left top-right bottom-left bottom-right
//pointing v1(1.483529, 1.483529), v2(1.483529, 1.658063), v3(1.658063, 1.483529), v4(1.658063, 1.658063); // 10deg x 10deg.
pointing v1(1.540566, 1.540566), v2(1.540566, 1.601026), v3(1.601026, 1.540566), v4(1.601026, 1.601026); // Square of 12deg^2:
// Create window function in Healpix map:
vertex.push_back(v1); vertex.push_back(v2); vertex.push_back(v4); vertex.push_back(v3);
Map.SetNside(nside, RING);
Map.query_polygon(vertex, pixset);
pixset.toVector(pixlist);
npixels = 12*Map.Nside()*Map.Nside();
for (i=0; i<npixels; i++) Map[i]=0.0;
count = 0;
for (i=0; i<pixlist.size(); i++) {
Map[pixlist[i]]=1.0;
count++;
}
// Print total area:
printf("Total area (deg^2): %g\n",((double)count)/((double)npixels)*41252.96125);
// Output file:
write_Healpix_map_to_fits("!"+outfile, Map, planckType<MAP_PRECISION>());
}
