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minimumfunction.cpp
00001 /*************************************************************************** 00002 minimumfunction.cpp - description 00003 ------------------- 00004 begin : Tue Nov 12 2002 00005 copyright : (C) 2002 by Fungmeista 00006 email : mizunoami44@sourceforge.net 00007 ***************************************************************************/ 00008 00009 /*************************************************************************** 00010 * * 00011 * This program is free software; you can redistribute it and/or modify * 00012 * it under the terms of the GNU General Public License as published by * 00013 * the Free Software Foundation; either version 2 of the License, or * 00014 * (at your option) any later version. * 00015 * * 00016 ***************************************************************************/ 00017 00018 #include "minimumfunction.h" 00019 00020 #include <qobject.h> 00021 00022 #include "fungparser.h" 00023 00024 MinimumFunction::MinimumFunction(BasicGraph *graph, int expressions) : MathFunction(graph,expressions) 00025 { 00026 } 00027 00028 MinimumFunction::~MinimumFunction() 00029 { 00030 } 00031 00032 void MinimumFunction::calculate_and_draw(QPainter *painter) 00033 { 00034 if ( lowerBounds.x() > upperBounds.x() ) //bounds check 00035 { 00036 QString s( QObject::tr("Invalid bounds") ); 00037 setResult( s ); 00038 return; 00039 } 00040 00041 double x = toGraphXCoord(lowerBounds.x()); 00042 double d[] = {x,animatorValue()}; 00043 double y = expression->Eval(d); 00044 min_x_point = x; 00045 min_y_point = y; 00046 for (int i=lowerBounds.x()+1; i<=upperBounds.x(); i++) 00047 { 00048 x = toGraphXCoord(i); 00049 d[0]=x; 00050 y = expression->Eval(d); 00051 if (y < min_y_point) 00052 { 00053 min_y_point = y; 00054 min_x_point = x; 00055 } 00056 } 00057 00058 QString s = QString(QObject::tr("Minimum = %1")).arg(min_y_point); 00059 setResult( s ); 00060 00061 draw_stored(painter); 00062 } 00063 00064 void MinimumFunction::draw_stored(QPainter *painter) 00065 { 00066 drawSelectedPoint( min_x_point, min_y_point, painter ); 00067 }