mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-05-07 19:52:35 +02:00
88 lines
1.9 KiB
ObjectPascal
88 lines
1.9 KiB
ObjectPascal
unit main;
|
|
|
|
{$mode objfpc}{$H+}
|
|
|
|
interface
|
|
|
|
uses
|
|
Classes, StdCtrls, SysUtils, FileUtil, LResources, Forms, Controls, Graphics,
|
|
Dialogs, TAGraph, TASeries, TASources;
|
|
|
|
type
|
|
|
|
{ TForm1 }
|
|
|
|
TForm1 = class(TForm)
|
|
Chart1: TChart;
|
|
Chart1BarSeries1: TBarSeries;
|
|
Chart1FuncSeries1: TFuncSeries;
|
|
Chart1UserDrawnSeries1: TUserDrawnSeries;
|
|
Chart1YAxis: TLine;
|
|
Chart1XAxis: TLine;
|
|
cbDomain: TCheckBox;
|
|
UserDefinedChartSource1: TUserDefinedChartSource;
|
|
procedure cbDomainChange(Sender: TObject);
|
|
procedure Chart1FuncSeries1Calculate(const AX: Double; out AY: Double);
|
|
procedure Chart1UserDrawnSeries1Draw(ACanvas: TCanvas; const ARect: TRect);
|
|
procedure UserDefinedChartSource1GetChartDataItem(
|
|
ASource: TUserDefinedChartSource; AIndex: Integer;
|
|
var AItem: TChartDataItem);
|
|
end;
|
|
|
|
var
|
|
Form1: TForm1;
|
|
|
|
implementation
|
|
|
|
uses
|
|
TAChartUtils;
|
|
|
|
{ TForm1 }
|
|
|
|
procedure TForm1.cbDomainChange(Sender: TObject);
|
|
var
|
|
i: Integer;
|
|
begin
|
|
with Chart1FuncSeries1.DomainExclusions do begin
|
|
Clear;
|
|
Epsilon := 1e-7;
|
|
if cbDomain.Checked then
|
|
for i := -10 to 10 do
|
|
AddPoint(i * Pi);
|
|
end;
|
|
end;
|
|
|
|
procedure TForm1.Chart1FuncSeries1Calculate(const AX: Double; out AY: Double);
|
|
begin
|
|
AY := 1 / Sin(AX);
|
|
end;
|
|
|
|
procedure TForm1.Chart1UserDrawnSeries1Draw(
|
|
ACanvas: TCanvas; const ARect: TRect);
|
|
var
|
|
a: TDoublePoint = (X: -1; Y: -1);
|
|
b: TDoublePoint = (X: 1; Y: 1);
|
|
r: TRect;
|
|
begin
|
|
r.TopLeft := Chart1.GraphToImage(a);
|
|
r.BottomRight := Chart1.GraphToImage(b);
|
|
ACanvas.Pen.Mode := pmCopy;
|
|
ACanvas.Pen.Color := clRed;
|
|
ACanvas.Pen.Style := psDash;
|
|
ACanvas.Brush.Style := bsClear;
|
|
ACanvas.Ellipse(r);
|
|
end;
|
|
|
|
procedure TForm1.UserDefinedChartSource1GetChartDataItem(
|
|
ASource: TUserDefinedChartSource; AIndex: Integer; var AItem: TChartDataItem);
|
|
begin
|
|
AItem.X := AIndex - ASource.PointsNumber / 2;
|
|
AItem.Y := Cos(AItem.X);
|
|
end;
|
|
|
|
initialization
|
|
{$I main.lrs}
|
|
|
|
end.
|
|
|