TrackingWindow.cpp

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00001 /*
00002  *  Copyright (C) Massimo Cora' 2005 <maxcvs@email.it>
00003  *
00004  *  This program is free software; you can redistribute it and/or modify
00005  *  it under the terms of the GNU General Public License as published by
00006  *  the Free Software Foundation; either version 2 of the License, or
00007  *  (at your option) any later version.
00008  *
00009  *  This program is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  *  GNU General Public License for more details.
00013  *
00014  *  You should have received a copy of the GNU General Public License
00015  *  along with this program; if not, write to the Free Software
00016  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00017  */
00018 
00019 
00020 #include "TrackingWindow.hh"
00021 
00022 //==================================================================
00023 //====                       TRACKING WINDOW                        ====
00024 //==================================================================
00025 
00026 
00027 //-------------------------------------------------------------------------
00028 //
00029 
00030 TrackingWindow::TrackingWindow( int window_id, int theta_start, int theta_end, int theta_max,
00031                                                            int freeze_frame_bound ) :
00032                                                                 _freeze_frame_bound( freeze_frame_bound ),
00033                                                                 _window_id( window_id ),
00034                                                                 _theta_start( theta_start ),
00035                                                                 _theta_end( theta_end ),
00036                                                                 _theta_max( theta_max )                                                 
00037 {
00038         _freeze_frame_remaining = _freeze_frame_bound;
00039 
00040         if ( _theta_start < _theta_end )        // 0 .. | | | |S| | | | | | |E| | | .. theta_max
00041                 this->_window_length = _theta_end - _theta_start;
00042         else                                                            // 0 .. | | | |E| | | | | | |S| | | .. theta_max
00043                 this->_window_length = _theta_end + _theta_max - _theta_start;
00044 }
00045 
00046 //-------------------------------------------------------------------------
00047 //
00048 
00049 TrackingWindow::~TrackingWindow() {
00050 
00051 }
00052 
00053 //-------------------------------------------------------------------------
00054 //
00055 
00056 int TrackingWindow::get_id() {
00057         return _window_id;
00058 }
00059 
00060 
00061 //-------------------------------------------------------------------------
00062 // perform the effective write of the angle interval to the degree table.
00063 // No check is done on value of the destination cell.
00064 
00065 void TrackingWindow::write_window_to_table( char* degree_table ) {
00066 
00067         for ( int i = 0 ; i < _window_length; i++ ) {
00068                 degree_table[(_theta_start + i) % _theta_max] = VALUE_TRACKED;
00069         }
00070 }
00071 
00072 
00073 //-------------------------------------------------------------------------
00074 // Sets the new bounds and length.
00075 // return false if the freeze status has expired
00076 
00077 bool TrackingWindow::update_window_bounds( int new_theta_start, int new_theta_end ) {
00078 
00079         // before setting the new values check about the freezing status
00080         if ( this->_theta_start == new_theta_start &&
00081                 this->_theta_end == new_theta_end )
00082                 _freeze_frame_remaining--;
00083         else    // give it some bonus :)
00084                 _freeze_frame_remaining = _freeze_frame_bound;
00085 
00086         this->_theta_start = new_theta_start;
00087         this->_theta_end = new_theta_end;
00088 
00089         if ( _theta_start < _theta_end )        // 0 .. | | | |S| | | | | | |E| | | .. theta_max
00090                 this->_window_length = _theta_end - _theta_start;
00091         else                                                    // 0 .. | | | |E| | | | | | |S| | | .. theta_max
00092                 this->_window_length = _theta_end + _theta_max - _theta_start;
00093 
00094         // if the freeze limit has expired we will update the bound status
00095         // BUT return false, signaling this
00096         if ( _freeze_frame_remaining <= 0 )
00097                 return false;
00098 
00099         return true;
00100 }
00101 
00102 
00103 
00104 //-------------------------------------------------------------------------
00105 // change the id of the window
00106 
00107 void TrackingWindow::change_id( int new_id ) {
00108         _window_id = new_id;
00109 }
00110 
00111 
00112 
00113 

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