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Bug 1545

Summary:	Index out of range when series is drawing
Product:	VCL TeeChart	Reporter:	IMT <roma_delta>
Component:	Series	Assignee:	Steema Issue Manager <issuemanager>
Status:	RESOLVED FIXED
Severity:	critical	CC:	marc, roma_delta, sandra
Priority:	High
Version:	150901
Target Milestone:	---
Hardware:	PC
OS:	Windows
Chart Series:	Line	Delphi / C++ Builder RAD IDE Version:	RAD XE7

Description IMT 2016-05-19 11:19:18 EDT

Hi,

Just discovered a bug in the latest build for VCL. The only thing required to reproduce is to recompile TeeChart with Range checking. 

Function TCustomSeries.DoDrawAll contains the bug on the line 4104:

DoDrawPointers(True,P[tmpIndex]);

tmpIndex - is wrong if tmpFraction is False. You are trying to address wrong tmpIndex = max. index + 1. To solve it quick, just replace above

      if tmpFraction then
      begin
        tmpValue:=XValues.Value[t-1]+tmpFractionValue;
        P[tmpIndex].X:=CalcXPosValue(tmpValue);
        P[tmpIndex].Y:=CalcPosLeftRight(tmpValue,tmpIndex-1,tmpIndex);
      end;

with

      if tmpFraction then
      begin
        tmpValue:=XValues.Value[t-1]+tmpFractionValue;
        P[tmpIndex].X:=CalcXPosValue(tmpValue);
        P[tmpIndex].Y:=CalcPosLeftRight(tmpValue,tmpIndex-1,tmpIndex);
      end
      else
        dec(tmpIndex);

It might help. Thank you very much!

Comment 1 IMT 2016-05-20 04:16:56 EDT

I forgot to add that you need to have all series points visible.

Comment 2 marc meumann 2021-04-21 03:01:56 EDT

I see the code mod is in there and this issue should have been closed down. Late to day, but thx for the observation.