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UnitFormMain.cpp
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UnitFormMain.cpp
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//---------------------------------------------------------------------------
/*
SurfacePlotter, plot a user-defined 2D function
Copyright (C) 2010 Richel Bilderbeek
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//---------------------------------------------------------------------------
// From http://www.richelbilderbeek.nl
//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include <sstream>
#include <boost/scoped_ptr.hpp>
#include "UnitFunctionParser.h"
#include "UnitFormMain.h"
#include "UnitFormAbout.h"
#include "UnitSurfacePlotter.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TFormMain *FormMain;
//---------------------------------------------------------------------------
__fastcall TFormMain::TFormMain(TComponent* Owner)
: TForm(Owner)
{
//OnAnyEditChange(0);
}
//---------------------------------------------------------------------------
void __fastcall TFormMain::OnEditFormulaChange(TObject *Sender)
{
//Obtain the range
if (!IsDouble(EditXmin->Text.c_str()))
{
PanelStatus->Caption = "Value of x_min is not a valid double";
return;
}
if (!IsDouble(EditXmax->Text.c_str()))
{
PanelStatus->Caption = "Value of x_max is not a valid double";
return;
}
const double x_min = EditXmin->Text.ToDouble();
const double x_max = EditXmax->Text.ToDouble();
if (x_min >= x_max)
{
PanelStatus->Caption = "Value of x_min must be smaller than x_max";
return;
}
if (!IsDouble(EditYmin->Text.c_str()))
{
PanelStatus->Caption = "Value of y_min is not a valid double";
return;
}
if (!IsDouble(EditYmax->Text.c_str()))
{
PanelStatus->Caption = "Value of y_max is not a valid double";
return;
}
const double y_min = EditYmin->Text.ToDouble();
const double y_max = EditYmax->Text.ToDouble();
if (y_min >= y_max)
{
PanelStatus->Caption = "Value of y_min must be smaller than y_max";
return;
}
FunctionParser f;
//Parse the formula
f.Parse(EditFormula->Text.c_str(),"x,y");
if (f.GetParseErrorType()!= FunctionParser::FP_NO_ERROR)
{
PanelStatus->Caption = "Function could not be parsed";
return;
}
//Evaluate the function in a 2D std::vector
const int n_rows = Image->Picture->Bitmap->Height;
const int n_cols = Image->Picture->Bitmap->Width;
std::vector<std::vector<double> > v(n_rows,std::vector<double>(n_cols,0.0));
const double n_rows_d = static_cast<double>(n_rows);
const double n_cols_d = static_cast<double>(n_cols);
for (int y = 0; y!=n_rows; ++y)
{
const double yD = static_cast<double>(y);
const double y_scaled = Rescale(yD,0.0,n_rows_d,y_min,y_max);
for (int x = 0; x!=n_cols; ++x)
{
const double xD = static_cast<double>(x);
const double x_scaled = Rescale(xD,0.0,n_cols_d,x_min,x_max);
const double xs[2] = { x_scaled,y_scaled };
const double z = f.Eval(xs);
if (!f.EvalError())
{
v[y][x] = z;
}
else
{
v[y][x] = 0.0;
}
}
}
//Plot the 2D std::vector
SurfacePlotter plotter(Image);
plotter.SetSurfaceGrey(v);
//this->Canvas->StretchDraw(rect,Image->Picture->Graphic);
Image->Refresh();
PanelStatus->Caption = "Function plotted successfully";
}
//---------------------------------------------------------------------------
//From http://www.richelbilderbeek.nl/CppIsDouble.htm
const bool IsDouble(const String& s)
{
try
{
s.ToDouble();
return true;
}
catch (EConvertError& e)
{
return false;
}
}
//---------------------------------------------------------------------------
void __fastcall TFormMain::ButtonAboutClick(TObject *Sender)
{
boost::scoped_ptr<TFormAbout> f(new TFormAbout(0));
f->ShowModal();
}
//---------------------------------------------------------------------------
void __fastcall TFormMain::OnEditRangeChange(TObject *Sender)
{
if (!IsDouble(EditXmin->Text.c_str()))
{
PanelStatus->Caption = "Value of x_min is not a valid double";
return;
}
if (!IsDouble(EditXmax->Text.c_str()))
{
PanelStatus->Caption = "Value of x_max is not a valid double";
return;
}
const double x_min = EditXmin->Text.ToDouble();
const double x_max = EditXmax->Text.ToDouble();
if (x_min >= x_max)
{
PanelStatus->Caption = "Value of x_min must be smaller than x_max";
return;
}
if (!IsDouble(EditYmin->Text.c_str()))
{
PanelStatus->Caption = "Value of y_min is not a valid double";
return;
}
if (!IsDouble(EditYmax->Text.c_str()))
{
PanelStatus->Caption = "Value of y_max is not a valid double";
return;
}
const double y_min = EditYmin->Text.ToDouble();
const double y_max = EditYmax->Text.ToDouble();
if (y_min >= y_max)
{
PanelStatus->Caption = "Value of y_min must be smaller than y_max";
return;
}
OnEditFormulaChange(0);
}
//---------------------------------------------------------------------------
//From http://www.richelbilderbeek.nl/CppRescale.htm
const double Rescale(
const double value,
const double oldMin,
const double oldMax,
const double newMin,
const double newMax)
{
assert(value >= oldMin);
assert(value <= oldMax);
const double oldDistance = oldMax - oldMin;
//At which relative distance is value on oldMin to oldMax ?
const double distance = (value - oldMin) / oldDistance;
assert(distance >= 0.0);
assert(distance <= 1.0);
const double newDistance = newMax - newMin;
const double newValue = newMin + (distance * newDistance);
assert(newValue >= newMin);
assert(newValue <= newMax);
return newValue;
}
//---------------------------------------------------------------------------
void __fastcall TFormMain::FormResize(TObject *Sender)
{
const int width = Image->Width;
const int height = Image->Height;
const int sz = std::min(width,height);
Image->Picture->Bitmap->Width = sz;
Image->Picture->Bitmap->Height = sz;
OnEditFormulaChange(0);
}
//---------------------------------------------------------------------------