Steema Central

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, TeeProcs, TeEngine, Chart, ComCtrls;

type
  TForm1 = class(TForm)
    Chart1: TChart;
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
    procedure StartTimer;
    procedure StopTimer;
  public
    { Public declarations }
    StartTime: TDateTime;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses Series, TeeJPEG, TeeExport, jpeg;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.AddSeries(TLineSeries.Create(Self)).FillSampleValues;
end;

procedure TForm1.Button1Click(Sender: TObject);
var i: Integer;
begin
  StartTimer;

  for i:=1 to 50 do
    TeeSaveToJPEGFile(Chart1,'chart' + IntToStr(i) + '.jpg', False,
                    jpBestSpeed, 60, 800, 400, 200);

  StopTimer;
end;

procedure TForm1.Button2Click(Sender: TObject);
var i: Integer;
    Stream: TMemoryStream;
begin
  StartTimer;

  for i:=1 to 50 do
    with TJPEGExportFormat.Create do
    begin
      Panel:=Chart1;
      Quality:=60;
      Width:=800;
      Height:=400;
      Stream:=TMemoryStream.Create;
      SaveToStream(Stream);
      Stream.Position:=0;
      SetDpiJPEG(Stream, 200, 200);
      Stream.SaveToFile('chart' + IntToStr(i) + '.jpg');
      Free;
      Stream.Free;
    end;

  StopTimer;
end;

procedure TForm1.StartTimer;
begin
  StartTime:=Now;
end;

procedure TForm1.StopTimer;
var TimeSpan: TDateTime;
begin
  TimeSpan:=Now-StartTime;
  Caption:=FormatDateTime('hh:mm:ss:zzz', TimeSpan);
end;