effectivearea.h

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/**********************************************************************
 *
 * PostGIS - Spatial Types for PostgreSQL
 * http://postgis.net
 *
 * PostGIS 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
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with PostGIS.  If not, see <http://www.gnu.org/licenses/>.
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 * Copyright 2014 Nicklas Avén
 *
 **********************************************************************/

 #ifndef _EFFECTIVEAREA_H
#define _EFFECTIVEAREA_H 1


 #include "liblwgeom_internal.h"
 #include "lwgeom_log.h"


typedef struct
{
        double area;
        int treeindex;
        int prev;
        int next;
} areanode;


typedef struct
{
        int maxSize;
        int usedSize;
        areanode **key_array;
} MINHEAP;


typedef struct
{
        const POINTARRAY *inpts;
        areanode *initial_arealist;
        double *res_arealist;
} EFFECTIVE_AREAS;


EFFECTIVE_AREAS* initiate_effectivearea(const POINTARRAY *inpts);

void destroy_effectivearea(EFFECTIVE_AREAS *ea);

void ptarray_calc_areas(EFFECTIVE_AREAS *ea,int avoid_collaps, int set_area, double trshld);

#endif /* _EFFECTIVEAREA_H */