[jfreechart-dev] [ jfreechart-Bugs-1847597 ] DateAxis tick marks display wrong with lowermargin of 0

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Bugs item #1847597, was opened at 2007-12-09 20:54
Message generated for change (Comment added) made by bradleyross
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Category: General
Group: None
Status: Open
Resolution: None
Priority: 8
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: David Gilbert (mungady)
Summary: DateAxis tick marks display wrong with lowermargin of 0

Initial Comment:
If a DateAxis is used on a time series chart and its lower margin is set to 0, the tick marks show the wrong values when the tick unit is 15 minutes or 30 minutes.

For example, if you chart 12 hours worth of data, with each time period being 30 minutes, the date axis will show the following tick mark values:
00:29, 00:59, 01:29, 01:59 etc
instead of
00:30, 01:00, 01:30, 02:00 etc

I have attached an example demo application that reproduces the problem.

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Comment By: Bradley Ross (bradleyross)
Date: 2008-09-16 14:05

Message:
I just ran into something very similar on a project I was working on.  I
had set the start and end times of the plot to midnights of the appropriate
dates and set the tick marks for every six hours.  The first time period
came across as being 5 hours long, with all of the later intervals being
six hours long.  I worked around the problem by moving the start time of
the plot two milliseconds earlier.  I used setLowerBound to set the start
of the axis to milliseconds before midnight.


The problem seems to be when using the constructor for DateTickUnit with a
integer value other than one and the lower bound of the date range axis is
exactly at the start of an interval for the tick.

I'll attach more details later and try to pare down the example program to
a more manageable size.




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Comment By: David Gilbert (mungady)
Date: 2008-04-08 17:33

Message:
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Thanks for the report, and especially the demo code.  I'll look into
this.

Regards,

Dave Gilbert
JFreeChart Project Leader

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