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How do I define a series for TChart without using the object inspector?

Posted on 2002-06-27
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Last Modified: 2010-04-04
I have 56 charts I want to show on a single form.  Rather than define each individually I set the charts up using an array of Tchart and defined as shown in the code below.  

var
  TestProgressForm: TTestProgressForm;
   Charts : array[1..MAX_WFR_COL,1..MAX_WFR_ROW] of Tchart;

Procedure TTestProgressForm.AssignChartProperties;
var col,row : integer;
begin
    for row := 1 to MAX_WFR_ROW do begin
    for col := 1 to MAX_WFR_COL do begin
      Charts[col,row] := Tchart.Create(TestProgressForm);
      Charts[col,row].Parent := TestProgressForm;
      charts[col,row].Enabled := TRUE;
      charts[col,row].BackWall.Color :=clRed;
      charts[col,row].Width := 80;
      charts[col,row].Height := 80;
      charts[col,row].MarginBottom := 0;
      charts[col,row].MarginLeft := 0;
      charts[col,row].MarginRight := 0;
      charts[col,row].MarginTop := 0;
      charts[col,row].Visible := True;
      charts[col,row].BackColor := clWhite;
      Charts[col,row].BottomAxis.Visible := FALSE;
      charts[col,row].LeftAxis.Visible := FALSE;
      charts[col,row].Legend.Frame.Visible := FALSE;
      charts[col,row].RightAxis.Visible := FALSE;
      charts[col,row].TopAxis.Visible := FALSE;
      charts[col,row].Title.Frame.Visible := FALSE;
      charts[col,row].View3D := FALSE;
      charts[col,row].Top := 525 - (row-1)*(charts[col,row].Height + 5);
      charts[col,row].Left := 55 + (col-1)*(charts[col,row].Width + 5);
    end;
  end;
end;

Defining the charts seems to work fine.  What I am having problems with is setting up the series associated with the chart.  I want to set up a barchart with 9 bars.  When I tried it using the object inspector the following code seemed to work fine:

type
  TTestProgressForm = class(TForm)
    ChartC4R7: TChart;
    BarSeries5: TBarSeries;
...

  (ChartC4R7.Series[0]as TBarSeries).CustomBarWidth := 10;
  (ChartC4R7.Series[0]as TBarSeries).AddXY(1,100,'',clGreen);
  (ChartC4R7.Series[0]as TBarSeries).AddXY(2,100,'',clRed);
  (ChartC4R7.Series[0]as TBarSeries).AddXY(3,100,'',clRed);
  (ChartC4R7.Series[0]as TBarSeries).AddXY(4,100,'',clGreen);
  (ChartC4R7.Series[0]as TBarSeries).AddXY(5,100,'',clGreen);
  (ChartC4R7.Series[0]as TBarSeries).AddXY(6,100,'',clRed);
  (ChartC4R7.Series[0]as TBarSeries).AddXY(7,100,'',clSkyBlue);
  (ChartC4R7.Series[0]as TBarSeries).AddXY(8,100,'',clBlue);
  (ChartC4R7.Series[0]as TBarSeries).AddXY(9,100,'',clGreen);

When I try to do the same code using Charts[col,row] instead of ChartC4R7 I get the following Debugger Exception Notification:

Project WaferProber.exe raised exception class ElistError with message 'List index out of bounds(0)'....

I know I must be missing a step but I don't know what it is.

Thanks,
P





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Question by:PattiGaultney
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2 Comments
 
LVL 8

Expert Comment

by:TOndrej
ID: 7114366
I guess you should also create your TBarSeries.
"List index out of bounds (0)" probably means you're trying to access Series[0] while there is no series component.
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LVL 8

Accepted Solution

by:
TOndrej earned 400 total points
ID: 7114409
I've read the title of your question and it seems you're already aware of the cause of the error; and you're actually asking how to set up the bar series.
Here is a quick code snippet:

procedure TForm1.Button1Click(Sender: TObject);
var
  Chart: TChart;
  BarSeries: TBarSeries;
begin
  Chart := TChart.Create(Self);
  try
    Chart.Parent := Self;
    Chart.Left := 8;
    Chart.Top := 8;
    BarSeries := TBarSeries.Create(Self);
    try
      Chart.AddSeries(BarSeries);
      // your code
      with Chart.Series[0] as TBarSeries do
      begin
        CustomBarWidth := 10;
        AddXY(1,100,'',clGreen);
        AddXY(2,100,'',clRed);
        AddXY(3,100,'',clRed);
        AddXY(4,100,'',clGreen);
        AddXY(5,100,'',clGreen);
        AddXY(6,100,'',clRed);
        AddXY(7,100,'',clSkyBlue);
        AddXY(8,100,'',clBlue);
        AddXY(9,100,'',clGreen);
      end;
    except
      BarSeries.Free;
      raise;
    end;
  except
    Chart.Free;
    raise;
  end;
end;

HTH
TOndrej
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