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Picking.H

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#ifndef _PICKING_H
#define _PICKING_H

#include <GL/gl.h>
#include <iostream>
#include <UserInterface.H>

namespace xchen
{
  class UI :: Picking 
  {
      enum { invalid_selected_id = -1 };   // must be <0 since the selected_id is used as array index in glModel.

      enum { hit_buff_sz = 1024 };
  public:
      Picking() : selected_id(invalid_selected_id)                          { }
      void operator()(int x, int y, double width=4.0, double height=4.0);

      int GetSelected()                                                     { return selected_id; }
      bool IsSelected()                                                     { return selected_id >= 0 ; }
      void UnSelect()                                                       { selected_id = invalid_selected_id; }

  private:
      int selected_id;

      GLuint selectBuf[hit_buff_sz];
      GLint hits;
      void processHits();
  };

}

#endif

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