[Nplot-devel] [ nplot-Bugs-1901521 ] Y Axis recommendation extended while X Axis is not

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Bugs item #1901521, was opened at 2008-02-25 10:59
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Category: General
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Matthew McDougal (mmdoogie)
Assigned to: Nobody/Anonymous (nobody)
Summary: Y Axis recommendation extended while X Axis is not

Initial Comment:
I ran into a problem that I wouldn't have even noticed had I not been trying to use a LogAxis as the Y Axis on a plot.

myPlotSurface.YAxis1 = new LogAxis(myLinePlot.SuggestYAxis)

When I then tried to refresh my plot, it would fail saying I can't have negative data on a log axis, but of course I didn't have any negative data.

Looking at the SequenceAdapter code in SVN, which I've trimmed a little just to get the relevant parts:

public Axis SuggestXAxis()
{
   Axis a = this.XAxisSuggester_.Get();

   // The world length should never be returned as 0
   // This would result in an axis with a span of 0 units
   // which can not be properly displayed.
   if (a.WorldLength == 0.0)
   {
      a.IncreaseRange(0.08);
   }
   
   return a;
}

public Axis SuggestYAxis()
{
   Axis a = this.YAxisSuggester_.Get();
   a.IncreaseRange(0.08);

   return a;
}

Basically, what occurs is on the X axis, the range is only increased if the returned axis was zero, but on the Y axis, it is always increased by +/- 8% of the range.  If your span is sufficiently large enough, and your lower limit close enough to zero, the range can get extended negative.

There may be a reason I don't know about, but if there isn't, I would suggest making the Y axis behave in the same manner as the X axis.

--matt

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