How to do a Portfolio Chart with TChart?

[Roland]

Hi,
I am trying to do a portfolio chart like http://ppmexecution.com/wp-content/uplo ... 24x747.jpg with TChart.
I thought the right charttype was Bubblechart, but when I use something like ...

Series1.AddBubble(1,1,0.2,'Portfoliobubble 1');
Series1.AddBubble(-1,-1,0.2,'Portfoliobubble 2');

... both bubbles are shown on top of each other and not - as I would have expected - in the bottom left and top right corners of the portfolio.

How can I achieve a portfoliochart with TChart?

Best regards

Roland

[Yeray]

Hi Roland,

To put the Left and bottom axes in the middle of the chart:

Code: Select all

  Chart1.Axes.Left.PositionPercent:=50;
  Chart1.Axes.Bottom.PositionPercent:=50;

[Roland]

Hi Yeray,
thanks - I know that, but this does not solve my problem.
My problem is that the X value seems to be neglected when I use

Code: Select all

Series1.AddBubble(1,1,0.2,'test1');
Series1.AddBubble(-1,-1,0.2,'test2');

The bubbles are shown in the correct Y value position but in the same X value position.

What do I need to do to have them in different X positions?

Best regards and thanks for your effort

Roland

[Yeray]

Hi Roland,

My problem is that the X value seems to be neglected when I use

Code: Select all

Series1.AddBubble(1,1,0.2,'test1');
Series1.AddBubble(-1,-1,0.2,'test2');

The bubbles are shown in the correct Y value position but in the same X value position.

I've added a chart to a new simple application using TeeChart v2015.14 and the following code:

Code: Select all

uses BubbleCh;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.View3D:=false;

  with Chart1.AddSeries(TBubbleSeries) as TBubbleSeries do
  begin
    AddBubble(1,1,0.2,'test1');
    AddBubble(-1,-1,0.2,'test2');
  end;

  Chart1.Axes.Bottom.LabelStyle:=talValue;
end;

And this is what I get, that seems to be correct to me:

2015-04-17_1548.png (14.56 KiB) Viewed 18100 times

If this is not what you are getting please tell us what environment are you using (what exact TeeChart, IDE version and OS) and please arrange a simple example project we can run as-is to reproduce the problem here.

Thanks in advance.

[Roland]

Hi.
That works in the same way for me, but the problem is that I do not want digit values but simply good, neutral, bad labels on the axis and that on all sides of the chart ... (see attachment)

I had problems to get that.

Ok - I achieved what I wanted now, but I do not understand why I need to do it like that - imo it should be easier - perhabs it is and I simply use TChart not in a good way. But I guess a certain complexity cannot be prevented when a component is such mighty as TChart ...

I do it now as follows ...
I added four custom axises to the chart.

In the chart setup I do ...

Code: Select all

Chart.Axes.Left.Automatic := false;
Chart.Axes.Right.Automatic := false;
Chart.Axes.Bottom.Automatic := false;
Chart.Axes.Top.Automatic := false;
Chart.Axes.Left.Visible := false;
Chart.Axes.Right.Visible := false;
Chart.Axes.Bottom.Visible := false;
Chart.Axes.Top.Visible := false;
Series1.AddBubble(1,1,0.2,'test1');
Series1.AddBubble(-1,-1,0.2,'test2');
SetAxisLabelsGoodNeutralBad(0);
SetAxisLabelsGoodNeutralBad(1);
SetAxisLabelsGoodNeutralBad(2);
SetAxisLabelsGoodNeutralBad(3);

SetAxisLabelGoodNeutralBad contains ...

Code: Select all

  Chart.CustomAxes[AAxisId].Automatic := false;
  Chart.CustomAxes[AAxisId].Items.Clear;
  Chart.CustomAxes[AAxisId].Items.Add(1,'gut');
  Chart.CustomAxes[AAxisId].Items.Add(0,'neutral');
  Chart.CustomAxes[AAxisId].Items.Add(-1,'schlecht');

Please let me know if there is an easier way.

Thanks a lot again for your help.

[Yeray]

Hello,

You should be able to do the same using the default Left/Right/Top/Bottom axes instead of using Custom Axes:

Code: Select all

var Series1: TBubbleSeries;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart.View3D:=false;
  Series1:=Chart.AddSeries(TBubbleSeries) as TBubbleSeries;
  Series1.VertAxis:=aBothVertAxis;
  Series1.HorizAxis:=aBothHorizAxis;

  Series1.AddBubble(1,1,0.2,'test1');
  Series1.AddBubble(-1,-1,0.2,'test2');
  SetAxisLabelsGoodNeutralBad(Chart.Axes.Left);
  SetAxisLabelsGoodNeutralBad(Chart.Axes.Right);
  SetAxisLabelsGoodNeutralBad(Chart.Axes.Top);
  SetAxisLabelsGoodNeutralBad(Chart.Axes.Bottom);
end;

procedure TForm1.SetAxisLabelsGoodNeutralBad(AAxis: TChartAxis);
begin
  AAxis.Grid.Visible:=false;
  AAxis.Items.Clear;
  AAxis.Items.Add(1,'gut');
  AAxis.Items.Add(0,'neutral');
  AAxis.Items.Add(-1,'schlecht');
end;

I've seen InflateMargins doesn't work fine for the Top axis in the TBubbleSeries when HorizAxis=aBothHorizAxis, so I've added it to the public tracker (B1197), and I already fixed it for the next maintenance release.

[Roland]

Super Support.
I will give your code a try. Thanks a lot.

Best regards

Roland

[Roland]

Works great.
Thanks.