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Bug 915

Summary:	when there is a 'gap' in TBarSeries.XValues, the bar width is calculated wrongly.
Product:	VCL TeeChart	Reporter:	h.hasenack <hans>
Component:	Series	Assignee:	Steema Issue Manager <issuemanager>
Status:	CONFIRMED ---
Severity:	major	CC:	narcis
Priority:	Normal
Version:	140512
Target Milestone:	---
Hardware:	PC
OS:	Windows
Chart Series:	---	Delphi / C++ Builder RAD IDE Version:
Attachments:	screenshot small demo project Fixes the bar width for irregular data

Description h.hasenack 2014-09-12 03:19:07 EDT

Created attachment 292 [details]
screenshot

Check the attached applm using the btBarWidthTrouble button. Barwidth bas based on the # of datapoints, but should actually bge based on the minimum of the X value intervals.

Comment 1 h.hasenack 2014-09-12 03:21:04 EDT

Created attachment 293 [details]
small demo project

Comment 2 narcís calvet 2014-09-12 07:01:11 EDT

This has a very easy workaround, which is adding null bars:

procedure TForm5.btBarWidthTroubleClick(Sender: TObject);
begin
  Series1.Clear;
  Series2.Clear;
  Series1.AddXY(10,10);
  Series1.AddXY(20,10);
  Series1.AddXY(30,10);
  //Workaround adding null bars
  Series1.AddNullXY(40, 10);
  Series1.AddNullXY(50, 10);
  Series1.AddNullXY(60, 10);
  Series1.AddNullXY(70, 10);
  Series1.AddNullXY(80, 10);
  Series1.AddNullXY(90, 10);
  // adding the extra bar with a higher X value causes the bar width to 'explode'.
  // The bar width should be based upon the smallest delta between X-values rather than
  // the # of data points in a bar series
  Series1.AddXY(100,10);
end;

Comment 3 h.hasenack 2014-09-12 08:17:46 EDT

I know about the workaround. The thing is that my end users want to load data from a query in XY pairs. adding extra null records to the query outpout is quite complicated hence I would rather like to it fixed in TeeChart. (same goes for bug 914 to which you already replied)

Comment 4 narcís calvet 2014-09-12 08:49:19 EDT

Thanks for the info. I have added reopened and added a reference to your comment at http://bugs.teechart.net/show_bug.cgi?id=914

Comment 5 h.hasenack 2015-05-21 05:32:42 EDT

I came up with a working solution for this. Take a look at the attached series.pas and look for the HH_PATCH_BARWIDTH defines

Comment 6 h.hasenack 2015-05-21 05:39:56 EDT

Created attachment 449 [details]
Fixes the bar width for irregular data

Only the changed routines are incorporated in the .pas file. You have to paste it ninto your complete series.pas file of TChart.