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Author Topic: TChartToolset creates SigSev  (Read 721 times)

kegge13

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    • the BistroMath project
TChartToolset creates SigSev
« on: April 06, 2021, 12:12:29 am »
Taking an example from WP in this thread:
https://forum.lazarus.freepascal.org/index.php/topic,52073.msg383172.html#msg383172
I created a TChartToolset, added a TDataPointCrosshairTool, assigned the TChartToolset to the TChart and wrote a OnDraw event for the TDataPointCrosshairTool.
There are two vertical axes with a TAutoScaleAxisTransform and multiple series, not all being active at all times.
In the OnDraw event I check that only active series are handled.
However, I keep getting SigSev errors quite often but not always.
As test I did set the TDataPointCrosshairTool.Enabled to false and set the AffectedSeries to the index number of just one single series which was always active. It appears that the TChartToolset itself is already running into trouble:
Code: Text  [Select][+][-]
  1. #0 UPDATEMINMAX(0, <error reading variable: Cannot access memory at address 0x18>, <error reading variable: Cannot access memory at address 0x20>) at tachartutils.pas:575
  2. #1 UPDATEBOUNDS(0x6882a38, 0, 100.00004585382453) at tatransformations.pas:746
  3. #2 UPDATEBOUNDS(0x68828a8, 0, 100.00004585382453) at tatransformations.pas:570
  4. #3 GETGRAPHBOUNDS(0x68a3cd8) at tacustomseries.pas:471
  5. #4 INBOUNDARYBOX(0x13ff530, 0x68a3cd8) at tatools.pas:1632
  6. #5 FINDNEARESTPOINT(0x6884468, {X = 403, Y = 318}) at tatools.pas:1676
  7. #6 MOUSEMOVE(0x6884468, {X = 403, Y = 318}) at tatools.pas:2020
  8. #7 DISPATCH(0x6884468, 0x5ed8108, EVIDMOUSEMOVE, {X = 403, Y = 318}) at tatools.pas:751
  9. #8 DISPATCH(0x6883758, 0x5ed8108, EVIDMOUSEMOVE, [], {X = 403, Y = 318}) at tatools.pas:1006
  10. #9 MOUSEMOVE(0x5ed8108, [], 403, 318) at tagraph.pas:1363
  11. #10 WMMOUSEMOVE(0x5ed8108, {MSG = 512, KEYS = 0, XPOS = 403, YPOS = 318, POS = {X = 403, Y = 318}, DUMMY = 20840851, RESULT = 0}) at include\control.inc:4430
  12. #11 SYSTEM$_$TOBJECT_$__$$_DISPATCH$formal at :0
  13. #12 ?? at :0
  14.  

Any suggestions?

Thanks in advance.

wp

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Re: TChartToolset creates SigSev
« Reply #1 on: April 06, 2021, 12:45:18 am »
I think you must try to create a little demo project which reproduces the issue and which you can upload here. Without a project there are too many possibility of something which can go wrong.
Mainly Lazarus trunk / fpc 3.2.0 / all 32-bit on Win-10, but many more...

 

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