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#include "terrain.h"
void Terrain::split()
{
if(is_split())
return;
quads[0][0] = new Terrain(V);
quads[0][1] = new Terrain(V);
quads[1][0] = new Terrain(V);
quads[1][1] = new Terrain(V);
quads[0][0]->set_range(*x1(), *x_mid(), *y1(), *y_mid());
quads[0][1]->set_range(*x_mid(), *x2(), *y1(), *y_mid());
quads[1][0]->set_range(*x1(), *x_mid(), *y_mid(), *y2());
quads[1][1]->set_range(*x_mid(), *x2(), *y_mid(), *y2());
}
void Terrain::track_down(double x, double y, double nz, int levels)
{
if( levels > 0 ) {
int a = ( x < *x_mid() ) ? 0 : 1;
int b = ( y < *y_mid() ) ? 0 : 1;
if( !is_split() )
split();
dynamic_cast<Terrain*>(quads[b][a])->track_down(x, y, nz, levels-1);
}
else {
z[0][0]=
z[0][1]=
z[1][1]=
z[1][0] = z_mean_ = nz;
}
}
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