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// ***** BEGIN LICENSE BLOCK *****
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// * Version: MPL 1.1
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// *
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// * The contents of this file are subject to the Mozilla Public License Version
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// * 1.1 (the "License"); you may not use this file except in compliance with
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// * the License. You may obtain a copy of the License at
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// * http://www.mozilla.org/MPL/
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// *
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// * Software distributed under the License is distributed on an "AS IS" basis,
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// * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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// * for the specific language governing rights and limitations under the
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// * License.
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// *
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// * The Original Code is TurboPower SysTools
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// *
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// * The Initial Developer of the Original Code is
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// * TurboPower Software
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// *
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// * Portions created by the Initial Developer are Copyright (C) 1996-2002
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// * the Initial Developer. All Rights Reserved.
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// *
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// * Contributor(s):
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// *
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// * ***** END LICENSE BLOCK *****
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//---------------------------------------------------------------------------
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#include <vcl.h>
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#pragma hdrstop
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#include "ExRndU.h"
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//---------------------------------------------------------------------------
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#pragma link "strandom"
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#pragma package(smart_init)
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#pragma resource "*.dfm"
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TForm1 *Form1;
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const
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AnsiString DistNames[12] = {
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"Beta", "Cauchy", "ChiSquared", "Erlang", "Exponential",
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"F", "Gamma", "LogNormal", "Normal", "Student's t",
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"Uniform", "Weibull"};
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//---------------------------------------------------------------------------
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__fastcall TForm1::TForm1(TComponent* Owner)
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: TForm(Owner)
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{
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}
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//---------------------------------------------------------------------------
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void __fastcall TForm1::FormCreate(TObject *Sender)
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{
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int i;
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int UniformInx;
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cboDist->Items->Clear();
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UniformInx = -1;
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for (i = 0; i < 12; i++) {
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cboDist->Items->Add(DistNames[i]);
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if (DistNames[i].AnsiCompare("Uniform") == 0)
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UniformInx = i;
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}
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cboDist->ItemIndex = UniformInx;
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cboDistChange(this);
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PRNG = new TStRandomSystem(0);
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}
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//---------------------------------------------------------------------------
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void __fastcall TForm1::FormDestroy(TObject *Sender)
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{
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delete PRNG;
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}
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//---------------------------------------------------------------------------
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void __fastcall TForm1::cboDistChange(TObject *Sender)
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{
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switch (cboDist->ItemIndex) {
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case 0 : PrepForBeta(); break;
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case 1 : PrepForCauchy(); break;
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case 2 : PrepForChiSquared(); break;
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case 3 : PrepForErlang(); break;
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case 4 : PrepForExponential(); break;
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case 5 : PrepForF(); break;
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case 6 : PrepForGamma(); break;
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case 7 : PrepForLogNormal(); break;
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case 8 : PrepForNormal(); break;
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case 9 : PrepForT(); break;
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case 10: PrepForUniform(); break;
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case 11: PrepForWeibull(); break;
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}
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updRightClick(this, btNext);
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updLeftClick(this, btNext);
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edtParm1->Text = FloatToStr(Value1);
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edtParm2->Text = FloatToStr(Value2);
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}
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//---------------------------------------------------------------------------
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void __fastcall TForm1::updRightClick(TObject *Sender, TUDBtnType Button)
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{
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lblRight->Caption = IntToStr(updRight->Position);
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GraphRight = updRight->Position;
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}
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//---------------------------------------------------------------------------
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void __fastcall TForm1::updLeftClick(TObject *Sender, TUDBtnType Button)
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{
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lblLeft->Caption = IntToStr(updLeft->Position);
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GraphLeft = updLeft->Position;
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}
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//---------------------------------------------------------------------------
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void __fastcall TForm1::PrepForBeta()
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{
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lblParm1->Caption = "Shape 1:";
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lblParm1->Visible = true;
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lblParm2->Caption = "Shape 2:";
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lblParm2->Visible = true;
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edtParm1->Visible = true;
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edtParm1->Enabled = true;
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edtParm2->Visible = true;
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edtParm2->Enabled = true;
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updLeft->Position = 0;
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updRight->Position = 1;
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Value1 = 2.0;
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Value2 = 4.0;
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GetRandom = GetBeta;
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}
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void __fastcall TForm1::PrepForCauchy()
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{
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lblParm1->Caption = "(none)";
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lblParm1->Visible = true;
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lblParm2->Visible = false;
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edtParm1->Visible = false;
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edtParm1->Enabled = false;
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edtParm2->Visible = false;
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edtParm2->Enabled = false;
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updLeft->Position = -5;
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updRight->Position = 5;
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Value1 = 0.0;
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Value2 = 0.0;
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GetRandom = GetCauchy;
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}
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void __fastcall TForm1::PrepForChiSquared()
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{
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lblParm1->Caption = "Degrees of freedom:";
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lblParm1->Visible = true;
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lblParm2->Visible = false;
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edtParm1->Visible = true;
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edtParm1->Enabled = true;
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edtParm2->Visible = false;
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edtParm2->Enabled = false;
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updLeft->Position = 0;
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updRight->Position = 20;
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Value1 = 5.0;
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Value2 = 0.0;
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GetRandom = GetChiSquared;
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}
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void __fastcall TForm1::PrepForErlang()
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{
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lblParm1->Caption = "Mean:";
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lblParm1->Visible = true;
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lblParm2->Caption = "Order:";
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lblParm2->Visible = true;
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edtParm1->Visible = true;
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edtParm1->Enabled = true;
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edtParm2->Visible = true;
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edtParm2->Enabled = true;
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updLeft->Position = 0;
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updRight->Position = 5;
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Value1 = 1.0;
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Value2 = 4.0;
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GetRandom = GetErlang;
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}
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void __fastcall TForm1::PrepForExponential()
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{
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lblParm1->Caption = "Mean:";
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lblParm1->Visible = true;
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lblParm2->Visible = false;
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edtParm1->Visible = true;
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edtParm1->Enabled = true;
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edtParm2->Visible = false;
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edtParm2->Enabled = false;
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updLeft->Position = 0;
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updRight->Position = 10;
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Value1 = 1.0;
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Value2 = 0.0;
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GetRandom = GetExponential;
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}
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void __fastcall TForm1::PrepForF()
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{
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lblParm1->Caption = "Degrees of freedom 1:";
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lblParm1->Visible = true;
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lblParm2->Caption = "Degrees of freedom 2:";
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lblParm2->Visible = true;
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edtParm1->Visible = true;
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edtParm1->Enabled = true;
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edtParm2->Visible = true;
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edtParm2->Enabled = true;
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updLeft->Position = 0;
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updRight->Position = 20;
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Value1 = 10.0;
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Value2 = 5.0;
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GetRandom = GetF;
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}
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void __fastcall TForm1::PrepForGamma()
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{
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lblParm1->Caption = "Shape:";
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lblParm1->Visible = true;
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lblParm2->Caption = "Scale:";
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lblParm2->Visible = true;
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edtParm1->Visible = true;
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edtParm1->Enabled = true;
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edtParm2->Visible = true;
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edtParm2->Enabled = true;
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updLeft->Position = 0;
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updRight->Position = 10;
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Value1 = 2.0;
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Value2 = 1.0;
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GetRandom = GetGamma;
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}
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void __fastcall TForm1::PrepForLogNormal()
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{
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lblParm1->Caption = "Mean:";
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lblParm1->Visible = true;
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lblParm2->Caption = "Standard deviation:";
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lblParm2->Visible = true;
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edtParm1->Visible = true;
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edtParm1->Enabled = true;
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edtParm2->Visible = true;
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edtParm2->Enabled = true;
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updLeft->Position = 0;
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updRight->Position = 10;
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Value1 = 0.0;
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Value2 = 1.0;
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GetRandom = GetLogNormal;
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}
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void __fastcall TForm1::PrepForNormal()
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{
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lblParm1->Caption = "Mean:";
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lblParm1->Visible = true;
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lblParm2->Caption = "Standard deviation:";
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lblParm2->Visible = true;
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edtParm1->Visible = true;
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edtParm1->Enabled = true;
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edtParm2->Visible = true;
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edtParm2->Enabled = true;
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updLeft->Position = -5;
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updRight->Position = 5;
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Value1 = 0.0;
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Value2 = 1.0;
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GetRandom = GetNormal;
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}
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void __fastcall TForm1::PrepForT()
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{
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lblParm1->Caption = "Degrees of freedom:";
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lblParm1->Visible = true;
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lblParm2->Visible = false;
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edtParm1->Visible = true;
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edtParm1->Enabled = true;
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edtParm2->Visible = false;
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edtParm2->Enabled = false;
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updLeft->Position = -10;
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updRight->Position = 10;
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Value1 = 10.0;
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Value2 = 0.0;
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GetRandom = GetT;
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}
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void __fastcall TForm1::PrepForUniform()
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{
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lblParm1->Caption = "(none)";
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lblParm1->Visible = true;
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lblParm2->Visible = false;
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edtParm1->Visible = false;
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edtParm1->Enabled = false;
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edtParm2->Visible = false;
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edtParm2->Enabled = false;
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updLeft->Position = 0;
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updRight->Position = 1;
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Value1 = 0.0;
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Value2 = 0.0;
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GetRandom = GetUniform;
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}
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void __fastcall TForm1::PrepForWeibull()
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{
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lblParm1->Caption = "Shape:";
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lblParm1->Visible = true;
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lblParm2->Caption = "Scale:";
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lblParm2->Visible = true;
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edtParm1->Visible = true;
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edtParm1->Enabled = true;
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edtParm2->Visible = true;
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edtParm2->Enabled = true;
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updLeft->Position = 0;
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updRight->Position = 10;
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Value1 = 2.0;
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Value2 = 3.0;
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GetRandom = GetWeibull;
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}
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double __fastcall TForm1::GetBeta()
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{
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return PRNG->AsBeta(Value1, Value2);
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}
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double __fastcall TForm1::GetCauchy()
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{
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return PRNG->AsCauchy();
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}
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double __fastcall TForm1::GetChiSquared()
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{
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if (Value1 > 65535.0)
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throw(Exception(
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"TForm1.GetChiSquared: the degrees of freedom value 1 is too large for this example program"));
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return PRNG->AsChiSquared(INT(Value1));
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}
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double __fastcall TForm1::GetErlang()
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{
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return PRNG->AsErlang(Value1, Value2);
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}
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double __fastcall TForm1::GetExponential()
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{
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return PRNG->AsExponential(Value1);
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}
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double __fastcall TForm1::GetF()
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{
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if (Value1 > 65535.0)
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throw(Exception(
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"TForm1.GetF: the degrees of freedom value 1 is too large for this example program"));
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if (Value2 > 65535.0)
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throw(Exception(
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"TForm1.GetF: the degrees of freedom value 2 is too large for this example program"));
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return PRNG->AsF(INT(Value1), INT(Value2));
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}
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double __fastcall TForm1::GetGamma()
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{
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return PRNG->AsGamma(Value1, Value2);
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}
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double __fastcall TForm1::GetLogNormal()
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{
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return PRNG->AsLogNormal(Value1, Value2);
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}
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double __fastcall TForm1::GetNormal()
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{
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return PRNG->AsNormal(Value1, Value2);
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}
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double __fastcall TForm1::GetT()
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{
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if (Value1 > 65535.0)
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throw(Exception(
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"TForm1.GetT: the degrees of freedom value is too large for this example program"));
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return PRNG->AsT(INT(Value1));
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}
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double __fastcall TForm1::GetUniform()
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{
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return PRNG->AsFloat();
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}
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double __fastcall TForm1::GetWeibull()
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{
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return PRNG->AsWeibull(Value1, Value2);
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}
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//---------------------------------------------------------------------------
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void __fastcall TForm1::btnGenerateClick(TObject *Sender)
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{
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if (edtParm1->Text.IsEmpty())
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Value1 = 0.0;
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else
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Value1 = StrToFloat(edtParm1->Text);
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if (edtParm2->Text.IsEmpty())
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Value2 = 0.0;
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else
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Value2 = StrToFloat(edtParm2->Text);
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GenerateGraph(cboDist->ItemIndex);
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}
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//---------------------------------------------------------------------------
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void __fastcall TForm1::GenerateGraph(int aDistInx)
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{
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#define RandomCount 1000000
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int Buckets[401];
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int i;
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double R;
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int Inx;
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int MaxHt;
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double MaxLineFactor;
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double GraphWidth;
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int OldPercent;
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int NewPercent;
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double MaxY;
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// zero out the buckets
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ZeroMemory(Buckets, sizeof(Buckets));
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// calculate random numbers according to distribution, convert to a
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// bucket index, and increment that bucket count
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OldPercent = -1;
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GraphWidth = imgGraph->Width;
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for (i = 0; i < RandomCount; i++) {
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NewPercent = (i * 100) / RandomCount;
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if (NewPercent != OldPercent) {
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prgGenProgress->Position = NewPercent;
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OldPercent = NewPercent;
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}
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R = GetRandom();
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if (((double) GraphLeft <= R) && (R <= (double) GraphRight)) {
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Inx = INT((R - GraphLeft) * GraphWidth / (GraphRight - GraphLeft));
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if ((0 <= Inx) && (Inx <= 400))
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Buckets[Inx]++;
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}
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}
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// calculate the largest bucket
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MaxHt = 1;
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for (i = 0; i <= 400; i++) {
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if (MaxHt < Buckets[i])
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MaxHt = Buckets[i];
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}
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// draw the graph
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imgGraph->Canvas->Lock();
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try {
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imgGraph->Canvas->FillRect(Rect(0, 0, imgGraph->Width, imgGraph->Height));
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MaxLineFactor = (double) imgGraph->Height / MaxHt;
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imgGraph->Canvas->Pen->Color = clRed;
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for (i = 0; i <= 400; i++) {
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imgGraph->Canvas->PenPos = Point(i, imgGraph->Height);
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imgGraph->Canvas->LineTo(i, imgGraph->Height - INT(Buckets[i] * MaxLineFactor));
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}
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}
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__finally {
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imgGraph->Canvas->Unlock();
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}
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MaxY = (double) MaxHt / RandomCount;
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lblMaxY->Caption = Format("Max: %8.6f", ARRAYOFCONST((MaxY)));
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}
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//---------------------------------------------------------------------------
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