[wxCode-users] [ wxcode-Bugs-3293977 ] (wxFreePlot) markers become invisible on XY charts

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Bugs item #3293977, was opened at 2011-04-27 20:30
Message generated for change (Tracker Item Submitted) made by philpem
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Category: None
Group: last released version
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Philip Pemberton (philpem)
Assigned to: Nobody/Anonymous (nobody)
Summary: (wxFreePlot) markers become invisible on XY charts

Initial Comment:
[freechart] BUGFIX: H/V marker visibility check error

In some situations, the marker lines on an XY chart may become invisible. The attached patch fixes this issue.

In brief: Markers were not being checked against the correct axis. A horizontal marker line should be checked against the vertical (Y) axis (because it's plotted on that axis), while a vertical marker line should be checked against the horizontal (X) axis. This meant that if you had a Y axis value range of say 1..1000 (integer) and an X axis value range of 0.04 to 2.00 (float), any vertical markers located below value 1.0 would be ignored (half the value span).

Other code which calls Axis->IsVisible() should also be checked for correctness.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=462816&aid=3293977&group_id=51305