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maximumfunction.cpp
00001 /*************************************************************************** 00002 maximumfunction.cpp - description 00003 ------------------- 00004 begin : Tue Nov 12 2002 00005 copyright : (C) 2002 by Fungmeista 00006 email : mizunoami44@users.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 "maximumfunction.h" 00019 00020 #include <qobject.h> 00021 #include <qpoint.h> 00022 00023 #include "fungparser.h" 00024 00025 MaximumFunction::MaximumFunction(BasicGraph *graph, int expressions) : MathFunction(graph,expressions) 00026 { 00027 } 00028 00029 MaximumFunction::~MaximumFunction() 00030 { 00031 } 00032 00033 void MaximumFunction::calculate_and_draw(QPainter *painter) 00034 { 00035 if ( lowerBounds.x() > upperBounds.x() ) //bounds check 00036 { 00037 QString s( QObject::tr("Invalid bounds") ); 00038 setResult( s ); 00039 return; 00040 } 00041 00042 double x = toGraphXCoord(lowerBounds.x()); 00043 double d[] = {x,animatorValue()}; 00044 double y = expression->Eval(d); 00045 00046 max_x_point = x; 00047 max_y_point = y; 00048 00049 for (int i=lowerBounds.x()+1; i<=upperBounds.x(); i++) 00050 { 00051 x = toGraphXCoord(i); 00052 d[0]=x; 00053 y = expression->Eval(d); 00054 if (y > max_y_point) 00055 { 00056 max_y_point = y; 00057 max_x_point = x; 00058 } 00059 } 00060 QString s = QString(QObject::tr("Maximum = %1")).arg(max_y_point); 00061 setResult(s); 00062 00063 draw_stored(painter); 00064 } 00065 00066 void MaximumFunction::draw_stored(QPainter *painter) 00067 { 00068 drawSelectedPoint(max_x_point,max_y_point, painter); 00069 }