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Pascal/Delphi Source File  |  2001-09-10  |  1.8 KB  |  76 lines
  1. unit Chart_OnBeforeDraw;
  2.  
  3. interface
  4.  
  5. uses
  6.   Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  7.   Base, ExtCtrls, TeeProcs, TeEngine, Chart, StdCtrls, Series;
  8.  
  9. type
  10.   TChartBeforeDraw = class(TBaseForm)
  11.     RadioGroup1: TRadioGroup;
  12.     Series1: TBarSeries;
  13.     procedure Chart1BeforeDrawChart(Sender: TObject);
  14.     procedure Chart1BeforeDrawAxes(Sender: TObject);
  15.     procedure Chart1BeforeDrawSeries(Sender: TObject);
  16.     procedure Chart1AfterDraw(Sender: TObject);
  17.     procedure RadioGroup1Click(Sender: TObject);
  18.     procedure FormCreate(Sender: TObject);
  19.   private
  20.     { Private declarations }
  21.   public
  22.     { Public declarations }
  23.     procedure DrawTheCircle;
  24.   end;
  25.  
  26. implementation
  27.  
  28. {$R *.DFM}
  29.  
  30. procedure TChartBeforeDraw.DrawTheCircle;
  31. begin
  32.   With Chart1.Canvas do
  33.   begin
  34.     Brush.Color:=clYellow;
  35.     Brush.Style:=bsSolid;
  36.     Pen.Color:=clBlue;
  37.     Pen.Style:=psDot;
  38.     Ellipse(10,10,Chart1.Width-10, Chart1.Height-10);
  39.   end;
  40. end;
  41.  
  42. procedure TChartBeforeDraw.Chart1BeforeDrawChart(Sender: TObject);
  43. begin
  44.   if RadioGroup1.ItemIndex=0 then DrawTheCircle;
  45. end;
  46.  
  47. procedure TChartBeforeDraw.Chart1BeforeDrawAxes(Sender: TObject);
  48. begin
  49.   if RadioGroup1.ItemIndex=1 then DrawTheCircle;
  50. end;
  51.  
  52. procedure TChartBeforeDraw.Chart1BeforeDrawSeries(Sender: TObject);
  53. begin
  54.   if RadioGroup1.ItemIndex=2 then DrawTheCircle;
  55. end;
  56.  
  57. procedure TChartBeforeDraw.Chart1AfterDraw(Sender: TObject);
  58. begin
  59.   if RadioGroup1.ItemIndex=3 then DrawTheCircle;
  60. end;
  61.  
  62. procedure TChartBeforeDraw.RadioGroup1Click(Sender: TObject);
  63. begin
  64.   Chart1.Repaint;
  65. end;
  66.  
  67. procedure TChartBeforeDraw.FormCreate(Sender: TObject);
  68. begin
  69.   inherited;
  70.   Series1.FillSampleValues(6);
  71. end;
  72.  
  73. initialization
  74.   RegisterClass(TChartBeforeDraw);
  75. end.
  76.