ErrorBar not plotted correctly

[emwamin]

Hi
It seems that ErrorBars are not plotted correctly when the Bar has a value below Zero. Only one side of the ErrorBar appear in the plot. This error has been in all previous versions. Last year I found a few posts in the forum claiming that it is corrected, but does not seems so. The following plot is from Tee Chart v2105.14.150.120:

ErrorBar.jpg (36.62 KiB) Viewed 10781 times

I also saved the plot in "tee" format so one can load it in a chart and recreate the error. Please download it by the following link:
http://www.multid.se/Amin/ErrorBar.tee

Please advise.

BR
emwamin

[Yeray]

Hello,

I also saved the plot in "tee" format so one can load it in a chart and recreate the error. Please download it by the following link:
http://www.multid.se/Amin/ErrorBar.tee

I get an error when trying to load this tee file, but I've made a simple example project trying to reproduce several situations:

testErrorBars.zip

(2.23 KiB) Downloaded 749 times

It seems that ErrorBars are not plotted correctly when the Bar has a value below Zero. Only one side of the ErrorBar appear in the plot.

I could reproduce the problem with the application above:

NegativeErrors_TopBottom.png (17.31 KiB) Viewed 10739 times

I'm studying if a small change in the sources is appropriate. This is how it looks with it:

NegativeErrors_TopBottom_new.png (17.69 KiB) Viewed 10723 times

Also note this modification also changes the result of the "Top" ErrorStyle, from this:

NegativeErrors_Top.png (16.92 KiB) Viewed 10732 times

To this:

NegativeErrors_Top_new.png (17.29 KiB) Viewed 10727 times

Your feedback will be appreciated.

This error has been in all previous versions. Last year I found a few posts in the forum claiming that it is corrected, but does not seems so. The following plot is from Tee Chart v2105.14.150.120:

I find this discussion, is this what you are referring?

[emwamin]

Hi

This solution works for me since I always use both Top and Down error bar. How can I get this correction?

BR
emwamin

[Yeray]

Hi,

How can I get this correction?

Since it is a small change and you own the sources, you can apply it and recompile.
At the end of the TCustomErrorSeries.DrawBar in ErrorBar.pas you have this:

Code: Select all

Procedure TCustomErrorSeries.DrawBar(BarIndex,StartPos,EndPos:Integer);
//...
    if IDrawBar and (YValues.Value[BarIndex]<YOrigin) then
    begin
      tmpHeight:=-tmpHeight;
      DoDrawError;
      inherited;
    end
    else
    begin
      if IDrawBar then
         inherited;

      DoDrawError;
    end;
  end
  else
  if IDrawBar then
     inherited;
end;

Change it for this:

Code: Select all

Procedure TCustomErrorSeries.DrawBar(BarIndex,StartPos,EndPos:Integer);
//...
    if IDrawBar then
       inherited;

    DoDrawError;
  end
  else
  if IDrawBar then
     inherited;
end;

[emwamin]

Hi

Worked like a charm. Thanks.

BR
emwamin

[emwamin]

Hi

After making that change I am facing a new problem. In toolbox I get the option for styling the ErrorBar but the controls are disabled. If you switch to another serie and switch back the styling controls are disappeared.
I am using Delphi 7 and TeeChart version 2015.16.150901.

BR
emwamin

Errorbar-Style-Error.jpg (60.01 KiB) Viewed 10606 times

[Yeray]

Hello,

In toolbox I get the option for styling the ErrorBar but the controls are disabled. If you switch to another serie and switch back the styling controls are disappeared.

I could reproduce that so I've added it tot he public tracker:
http://bugs.teechart.net/show_bug.cgi?id=1419
Note I've also fixed it for the next maintenance release.