Source:NetHack 3.6.0/include/qt clust.h

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 /* NetHack 3.6	qt_clust.h	$NHDT-Date: 1432512779 2015/05/25 00:12:59 $  $NHDT-Branch: master $:$NHDT-Revision: 1.8 $ */
 /* Copyright (c) Warwick Allison, 1999. */
 /* NetHack may be freely redistributed.  See license for details. */
 
 #ifndef clusterizer_H
 #define clusterizer_H
 
 #include <qrect.h>
 
 class Clusterizer
 {
   public:
     Clusterizer(int maxclusters);
     ~Clusterizer();
 
     void add(int x, int y); // 1x1 rectangle (point)
     void add(int x, int y, int w, int h);
     void add(const QRect &rect);
 
     void clear();
     int
     clusters()
     {
         return count;
     }
     const QRect &operator[](int i);
 
   private:
     QRect *cluster;
     int count;
     const int max;
 };
 
 #endif