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#include <stdlib.h>
#include "quad.h"
Quad::Quad() :
V(new std::vector<double>)
{
quads[0][0] =
quads[0][1] =
quads[1][0] =
quads[1][1] = 0;
unsigned int V_old_size = V->size();
unsigned int V_new_size = V_old_size + 9;
V->resize(V_new_size, 0.);
v1_offset = V_new_size - 3*3;
v2_offset = V_new_size - 2*3;
v_mid_offset = V_new_size - 1*3;
set_range(0., 1., 0., 1.);
}
Quad::Quad( std::vector<double> * const V_) :
V(V_)
{
quads[0][0] =
quads[0][1] =
quads[1][0] =
quads[1][1] = 0;
unsigned int V_old_size = V->size();
unsigned int V_new_size = V_old_size + 9;
V->resize(V_new_size, 0.);
v1_offset = V_new_size - 3*3;
v2_offset = V_new_size - 2*3;
v_mid_offset = V_new_size - 1*3;
set_range(0., 1., 0., 1.);
}
Quad::Quad(Quad &q) :
V(new std::vector<double>)
{
operator= (q);
}
Quad::~Quad()
{
if(is_split())
{
delete quads[0][0];
delete quads[0][1];
delete quads[1][0];
delete quads[1][1];
}
}
Quad& Quad::operator=(Quad &q)
{
*x1() = *q.x1();
*x2() = *q.x2();
*y1() = *q.y1();
*y2() = *q.y2();
if( q.is_split() )
{
split();
quads[0][0] = q.quads[0][0];
quads[0][1] = q.quads[0][1];
quads[1][0] = q.quads[1][0];
quads[1][1] = q.quads[1][1];
}
return *this;
}
void Quad::split()
{
if(is_split())
return;
quads[0][0] = new Quad(V);
quads[0][1] = new Quad(V);
quads[1][0] = new Quad(V);
quads[1][1] = new Quad(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() );
}
bool Quad::is_split()
{
return quads[0][0] &&
quads[0][1] &&
quads[1][0] &&
quads[1][1];
}
void Quad::set_range(double nx1, double nx2, double ny1, double ny2)
{
*x1() = nx1;
*x2() = nx2;
*y1() = ny1;
*y2() = ny2;
*x_mid() = ( *x1() + *x2() )*0.5f;
*y_mid() = ( *y1() + *y2() )*0.5f;
}
void Quad::track_down(double x, double y, int levels)
{
if(levels>0)
{
int a = ( x < *x_mid() ) ? 0 : 1;
int b = ( y < *y_mid() ) ? 0 : 1;
if( !is_split() )
split();
quads[b][a]->track_down(x, y, levels-1);
}
}
Quad *Quad::get_at(double x, double y, int max_level, int level)
{
if(!is_split())
return this;
/*if(max_level>-1 && level>=max_level)
return this;*/
int a = ( x < *x_mid() ) ? 0 : 1;
int b = ( y < *y_mid() ) ? 0 : 1;
return quads[b][a]->get_at(x, y, max_level, level+1);
}
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