Changing axis labels

[bdw]

Hello,
We have TeeChart Pro V7.05 VCL, what I was wanting to do is display wind direction on a time series chart. In doing so I was wanting to both display 0-360 degrees and also a N,S,W,E label. Is this possible ? I was looking at the TAxisLabelTool component but couldn't find anything in the help file on it ?
TIA,
Brett.

[bdw]

Ok, I worked out a way of doing it.....i.e.
TChartAxis *axis = graph_->Axes->Right;
axis->Items->Clear(); // remove all custom labels
// add custom labels
axis->Items->Add(0.0, "N");
...etc...
If there is a better way feel free to comment.
Brett.

[Marjan]

Hi, Brett.

I think this is the best approach (using custom labels to fully customize axis labels).

[Keynetix]

Hi Brett,

I am also attempting to plot wind direction charts.

Would it be possible for you to post a full code list for add a custom axis, as it is hard to follow the example you have given.

Many Thanks

James

[Keynetix]

Or if anyone has a vb example, Would be fab.

Thanks

James.

[Narcís]

Hi James,

I already replied to the message you posted in the ActiveX forum.

Regarding custom labels, you can find an example at TeeChart's features demo. The example can be found at All Features\Welcome!\Axes\Labels\Custom Labels.

[xxxxxx]

I was looking at the TAxisLabelTool component but couldn't find anything in the help file on it ?
TIA,
Brett.

I recently found it's just a demo example of a Custom Chart Tool class located in Examples\Features\TeeAxisLabelTool.pas.

In one of my programs I used

Code: Select all

procedure TForm2.chWGetAxisLabel(Sender: TChartAxis; Series: TChartSeries;
  ValueIndex: Integer; var LabelText: String);
var
  X:double;
  Code:integer;
begin
  if Sender=chW.BottomAxis then
  begin
    Val(LabelText,X,Code);
    if (Round(X)=0) or (Round(X)=360) then
      LabelText:='N'
    else
    if Round(X)=90 then
      LabelText:='E'
    else
    if Round(X)=180 then
      LabelText:='S'
    else
    if Round(X)=270 then
      LabelText:='W'
    else
      Str(X:3:0,LabelText);
  end;
end;

To mee TAxisItems seems interesting but little bit raw (e.g. rendering of 'e' is poor if LabelsExponent=True) and insufficient for the task as suppress drawing of regular labels.