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costcalculator.cpp
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costcalculator.cpp
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/***************************************************************************
costcalculator.cpp
---------------------
begin : November 2009
copyright : (C) 2009 by Martin Dobias
email : wonder dot sk at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "layer.h"
#include "pal.h"
#include "feature.h"
#include "geomfunction.h"
#include "labelposition.h"
#include "util.h"
#include "costcalculator.h"
#include <iostream>
#include <fstream>
#include <cmath>
#include <cfloat>
namespace pal
{
void CostCalculator::addObstacleCostPenalty( LabelPosition* lp, FeaturePart* obstacle )
{
int n = 0;
double dist;
double distlabel = lp->feature->getLabelDistance();
switch ( obstacle->getGeosType() )
{
case GEOS_POINT:
dist = lp->getDistanceToPoint( obstacle->x[0], obstacle->y[0] );
if ( dist < 0 )
n = 2;
else if ( dist < distlabel )
n = 1;
else
n = 0;
break;
case GEOS_LINESTRING:
// Is one of label's borders crossing the line ?
n = ( lp->isBorderCrossingLine( obstacle ) ? 1 : 0 );
break;
case GEOS_POLYGON:
// behaviour depends on obstacle avoid type
switch ( obstacle->layer()->obstacleType() )
{
case PolygonInterior:
// n ranges from 0 -> 12
n = lp->getNumPointsInPolygon( obstacle->getNumPoints(), obstacle->x, obstacle->y );
break;
case PolygonBoundary:
// penalty may need tweaking, given that interior mode ranges up to 12
n = ( lp->isBorderCrossingLine( obstacle ) ? 6 : 0 );
break;
}
break;
}
// label cost is penalized
lp->setCost( lp->getCost() + double( n ) );
}
////////
void CostCalculator::setPolygonCandidatesCost( int nblp, LabelPosition **lPos, int max_p, RTree<FeaturePart*, double, 2, double> *obstacles, double bbx[4], double bby[4] )
{
int i;
double normalizer;
// compute raw cost
#ifdef _DEBUG_
std::cout << "LabelPosition for feat: " << lPos[0]->feature->uid << std::endl;
#endif
for ( i = 0; i < nblp; i++ )
setCandidateCostFromPolygon( lPos[i], obstacles, bbx, bby );
// lPos with big values came fisrts (value = min distance from label to Polygon's Perimeter)
//sort ( (void**) lPos, nblp, costGrow);
sort(( void** ) lPos, nblp, LabelPosition::costShrink );
// define the value's range
double cost_max = lPos[0]->getCost();
double cost_min = lPos[max_p-1]->getCost();
cost_max -= cost_min;
if ( cost_max > EPSILON )
{
normalizer = 0.0020 / cost_max;
}
else
{
normalizer = 1;
}
// adjust cost => the best is 0.0001, the worst is 0.0021
// others are set proportionally between best and worst
for ( i = 0; i < max_p; i++ )
{
#ifdef _DEBUG_
std::cout << " lpos[" << i << "] = " << lPos[i]->cost;
#endif
//if (cost_max - cost_min < EPSILON)
if ( cost_max > EPSILON )
{
lPos[i]->cost = 0.0021 - ( lPos[i]->getCost() - cost_min ) * normalizer;
}
else
{
//lPos[i]->cost = 0.0001 + (lPos[i]->cost - cost_min) * normalizer;
lPos[i]->cost = 0.0001;
}
#ifdef _DEBUG_
std::cout << " ==> " << lPos[i]->cost << std::endl;
#endif
}
}
void CostCalculator::setCandidateCostFromPolygon( LabelPosition* lp, RTree <FeaturePart*, double, 2, double> *obstacles, double bbx[4], double bby[4] )
{
double amin[2];
double amax[2];
PolygonCostCalculator *pCost = new PolygonCostCalculator( lp );
// center
//cost = feat->getDistInside((this->x[0] + this->x[2])/2.0, (this->y[0] + this->y[2])/2.0 );
pCost->update( lp->feature );
PointSet *extent = new PointSet( 4, bbx, bby );
pCost->update( extent );
delete extent;
lp->feature->getBoundingBox( amin, amax );
obstacles->Search( amin, amax, LabelPosition::polygonObstacleCallback, pCost );
lp->setCost( pCost->getCost() );
delete pCost;
}
int CostCalculator::finalizeCandidatesCosts( Feats* feat, int max_p, RTree <FeaturePart*, double, 2, double> *obstacles, double bbx[4], double bby[4] )
{
// If candidates list is smaller than expected
if ( max_p > feat->nblp )
max_p = feat->nblp;
//
// sort candidates list, best label to worst
sort(( void** ) feat->lPos, feat->nblp, LabelPosition::costGrow );
// try to exclude all conflitual labels (good ones have cost < 1 by pruning)
double discrim = 0.0;
int stop;
do
{
discrim += 1.0;
for ( stop = 0; stop < feat->nblp && feat->lPos[stop]->getCost() < discrim; stop++ )
;
}
while ( stop == 0 && discrim < feat->lPos[feat->nblp-1]->getCost() + 2.0 );
if ( discrim > 1.5 )
{
int k;
for ( k = 0; k < stop; k++ )
feat->lPos[k]->setCost( 0.0021 );
}
if ( max_p > stop )
max_p = stop;
#ifdef _DEBUG_FULL_
std::cout << "Nblabel kept for feat " << feat->feature->getUID() << "/" << feat->feature->getLayer()->getName() << ": " << max_p << "/" << feat->nblp << std::endl;
#endif
// Sets costs for candidates of polygon
if ( feat->feature->getGeosType() == GEOS_POLYGON )
{
int arrangement = feat->feature->layer()->arrangement();
if ( arrangement == P_FREE || arrangement == P_HORIZ )
setPolygonCandidatesCost( stop, ( LabelPosition** ) feat->lPos, max_p, obstacles, bbx, bby );
}
// add size penalty (small lines/polygons get higher cost)
feat->feature->addSizePenalty( max_p, feat->lPos, bbx, bby );
return max_p;
}
//////////
PolygonCostCalculator::PolygonCostCalculator( LabelPosition *lp ) : lp( lp )
{
px = ( lp->x[0] + lp->x[2] ) / 2.0;
py = ( lp->y[0] + lp->y[2] ) / 2.0;
dist = DBL_MAX;
ok = false;
}
void PolygonCostCalculator::update( PointSet *pset )
{
double rx, ry;
pset->getDist( px, py, &rx, &ry );
double d = dist_euc2d_sq( px, py, rx, ry );
if ( d < dist )
{
dist = d;
}
}
LabelPosition* PolygonCostCalculator::getLabel()
{
return lp;
}
double PolygonCostCalculator::getCost()
{
return ( 4 * dist );
}
}