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https://gitlab.com/freepascal.org/lazarus/lazarus.git
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97 lines
2.2 KiB
ObjectPascal
97 lines
2.2 KiB
ObjectPascal
unit frmDomain;
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{$mode ObjFPC}{$H+}
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interface
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uses
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SysUtils, Classes,
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Graphics, Forms, Controls, StdCtrls,
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TAGraph, TAChartUtils, TAFuncSeries, TASources, Types, TASeries, TACustomSource;
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type
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TDomainFrame = class(TFrame)
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cbDomain: TCheckBox;
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cbRotate: TCheckBox;
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Chart: TChart;
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BarSeries: TBarSeries;
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FuncSeries: TFuncSeries;
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UserDrawnSeries: TUserDrawnSeries;
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ChartXAxis: TConstantLine;
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ChartYAxis: TConstantLine;
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UserDefinedChartSource1: TUserDefinedChartSource;
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procedure cbDomainChange(Sender: TObject);
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procedure cbRotateChange(Sender: TObject);
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procedure FuncSeriesCalculate(const AX: Double; out AY: Double);
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procedure UserDefinedChartSource1GetChartDataItem(ASource:
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TUserDefinedChartSource; AIndex: Integer; var AItem: TChartDataItem);
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procedure UserDrawnSeriesDraw(ACanvas: TCanvas; const ARect: TRect);
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private
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public
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end;
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implementation
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{$R *.lfm}
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procedure TDomainFrame.cbDomainChange(Sender: TObject);
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var
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i: Integer;
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begin
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with FuncSeries.DomainExclusions do begin
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Clear;
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Epsilon := 1e-7;
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if cbDomain.Checked then
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for i := -10 to 10 do
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AddPoint(i * Pi);
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end;
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end;
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procedure TDomainFrame.cbRotateChange(Sender: TObject);
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begin
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with FuncSeries do
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if cbRotate.Checked then begin
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AxisIndexX := 0;
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AxisIndexY := 1;
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end
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else begin
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AxisIndexX := 1;
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AxisIndexY := 0;
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end;
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end;
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procedure TDomainFrame.FuncSeriesCalculate(const AX: Double; out AY:
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Double);
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begin
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AY := 1 / Sin(AX);
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end;
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procedure TDomainFrame.UserDefinedChartSource1GetChartDataItem(ASource:
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TUserDefinedChartSource; AIndex: Integer; var AItem: TChartDataItem);
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begin
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AItem.X := AIndex - ASource.PointsNumber / 2;
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AItem.Y := Cos(AItem.X);
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end;
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procedure TDomainFrame.UserDrawnSeriesDraw(ACanvas: TCanvas;
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const ARect: TRect);
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var
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a: TDoublePoint = (X: -1; Y: -1);
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b: TDoublePoint = (X: 1; Y: 1);
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r: TRect;
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begin
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Unused(ARect);
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r.TopLeft := Chart.GraphToImage(a);
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r.BottomRight := Chart.GraphToImage(b);
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ACanvas.Pen.Mode := pmCopy;
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ACanvas.Pen.Color := clRed;
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ACanvas.Pen.Style := psDash;
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ACanvas.Brush.Style := bsClear;
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ACanvas.Ellipse(r);
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end;
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end.
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