mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-05-06 08:52:59 +02:00
115 lines
2.6 KiB
ObjectPascal
115 lines
2.6 KiB
ObjectPascal
unit Main;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, ExtCtrls, Spin, StdCtrls, SysUtils, FileUtil, Forms, Controls,
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Graphics, Dialogs, TAGraph, TASeries, TASources, TACustomSource;
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type
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TForm1 = class(TForm)
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btnGenerate: TButton;
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Chart1: TChart;
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Chart1LineSeries1: TLineSeries;
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Chart1ManhattanSeries1: TManhattanSeries;
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lblTime: TLabel;
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pnlControls: TPanel;
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seCount: TSpinEdit;
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UserDefinedChartSource1: TUserDefinedChartSource;
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procedure btnGenerateClick(Sender: TObject);
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procedure Chart1AfterDrawBackground(
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ASender: TChart; ACanvas: TCanvas; const ARect: TRect);
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procedure Chart1AfterPaint(ASender: TChart);
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procedure UserDefinedChartSource1GetChartDataItem(
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ASource: TUserDefinedChartSource; AIndex: Integer;
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var AItem: TChartDataItem);
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end;
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var
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Form1: TForm1;
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implementation
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{$R *.lfm}
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uses
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LCLIntf, TAChartUtils;
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var
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GaussDevAvail: Boolean = false;
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GaussDev: Double = 0.0;
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// Create a random number with normal distribution, mean value 0, standard
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// deviation 1. See Numerical Recipes.
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function RndNormal: Double;
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var
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fac, r, v1, v2: Double;
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begin
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if GaussDevAvail then
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Result := GaussDev
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else begin
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repeat
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v1 := 2.0 * Random - 1.0;
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v2 := 2.0 * Random - 1.0;
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r := Sqr(v1) + Sqr(v2);
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until (r > 0.0) and (r < 1.0);
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fac := Sqrt(-2.0 * Ln(r) / r);
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GaussDev := v1 * fac;
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Result := v2 * fac;
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end;
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GaussDevAvail := not GaussDevAvail;
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end;
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var
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VData: array of record X, Y: Double; Color: TColor; end;
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t0: Int64;
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{ TForm1 }
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procedure TForm1.btnGenerateClick(Sender: TObject);
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const
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COLORS: array [1..5] of TColor = (clYellow, clBlue, clGreen, clMaroon, clFuchsia);
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var
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i: Integer;
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begin
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SetLength(VData, seCount.Value);
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for i := 0 to High(VData) do
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with VData[i] do begin
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X := Random(1000);
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Y := Abs(RndNormal);
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Color := COLORS[Trunc(X / 1000 * Length(COLORS)) + 1];
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end;
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UserDefinedChartSource1.PointsNumber := seCount.Value;
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UserDefinedChartSource1.Reset;
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end;
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procedure TForm1.Chart1AfterDrawBackground(
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ASender: TChart; ACanvas: TCanvas; const ARect: TRect);
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begin
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Unused(ASender);
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Unused(ACanvas, ARect);
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t0 := GetTickCount64;
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end;
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procedure TForm1.Chart1AfterPaint(ASender: TChart);
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begin
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Unused(ASender);
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lblTime.Caption := Format('Time: %d ms', [GetTickCount64 - t0]);
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end;
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procedure TForm1.UserDefinedChartSource1GetChartDataItem(
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ASource: TUserDefinedChartSource; AIndex: Integer; var AItem: TChartDataItem);
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begin
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Unused(ASource);
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with VData[AIndex] do begin
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AItem.X := X;
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AItem.Y := Y;
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AItem.Color := Color;
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end;
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end;
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end.
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