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Bug 1876 - Problem with Marks not always showing
Summary: Problem with Marks not always showing
Status: RESOLVED NOTABUG
Alias: None
Product: VCL TeeChart
Classification: Unclassified
Component: Chart (show other bugs)
Version: unspecified
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Steema Issue Manager
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-06-05 19:03 EDT by weatherdisplay
Modified: 2017-07-12 22:34 EDT (History)
1 user (show)

See Also:
Chart Series: ---
Delphi / C++ Builder RAD IDE Version:

Attachments
demo to show the bug (54.25 KB, application/x-zip-compressed)
2017-06-05 19:03 EDT, weatherdisplay 		Details
simplified test project (82.76 KB, application/octet-stream)
2017-06-08 07:26 EDT, yeray alonso 		Details
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Description weatherdisplay 2017-06-05 19:03:29 EDT 
Created attachment 769 [details]
demo to show the bug

HI
This bug was introduced in a recent update of Tchart
(I am using Delphi Berlin 10.1 update 2)
The value for a point, as shown as the Mark, does not always get displayed, like it used to
I have a test project to illustrate:
http://www.weather-display.com/downloadfiles/Project74.zip
also attached

change the spinedit by say 1 up or down and click on test..the word test will show at the top of the line for 1 value and then not for another value for the spinedit

this used to work for any value but now its like only every 4 values change
thanks for any help
Brian
weatherdisplay
Newbie
Newbie
 
Posts: 30
Joined: Mon Oct 24, 2016 12:00 am
Comment 1 yeray alonso 2017-06-08 07:26:57 EDT 
Created attachment 770 [details]
simplified test project

I've simplified the project, clearing design time settings and using two charts: one to show the problem with the point at value=1 and the other one to show how it works fine with the point at value=2.

Note the problem seems to be introduced in v2016.19, because both charts show the "test" label with v2016.18.
Comment 2 weatherdisplay 2017-06-08 13:56:40 EDT 
Comment on attachment 770 [details]
simplified test project

Hi
Thanks for confirming
I am not able to use a version as old as v2016.18
as it is not compatible with Delphi Berlin
(unless a version that is compatible is able to be made available?
thanks
Brian
Comment 3 marc meumann 2017-07-12 11:23:44 EDT 
The problem appears to relate to the following property:

Series.CalcVisiblePoints

It is default True for many Series types including the case here for FastLine.

Please set the following:

Series.CalcVisiblePoints := false;

(in the test example: chart2[1].CalcVisiblePoints := false;)


We will check how default behaviour should be modified.
Comment 4 weatherdisplay 2017-07-12 22:34:36 EDT 
the behaviour around that setting must have changed
as the same code stopped working with the recent updates
or did that setting now become true be default