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