<h2>org.autoplot.pngwalk.RichPngUtil</h2><p>At the 2012 MMS meeting at UNH, a group of us proposed that we
 embed a little metadata within PNG images which provides lookup 
 information in JSON format.  

 Here is an example:
<blockquote><pre>
 { "size":[722,639],
 "numberOfPlots":1,
 "plots": [
    {
      "title":"AC/MFI  [PRELIMINARY VALUES - BROWSE USE ONLY] B-field magnitude", 
      "xaxis": { "label":"", "min":"2014-01-02T00:00:00.000Z", "max":"2014-01-03T00:00:00.000Z", "left":78, "right":644, "type":"lin", "units":"UTC" },
      "yaxis": { "label":"[PRELIM] <|B|> (nT)", "min":4.440892098500626E-16, "max":8.9, "top":52, "bottom":587, "type":"lin", "units":"nT" }
    }
 ] }
</pre></blockquote>

 See http://autoplot.org/richPng</p>
<h2>RichPngUtil( )</h2>
<p></p>

<hr>
<a name="getRange"></a>
<h2>getRange</h2>
getRange( JSONObject axis ) &rarr; <a href='http://www-pw.physics.uiowa.edu/~jbf/autoplot/doc/org/das2/datum/DatumRange.html'>DatumRange</a>

<p>return the range setting of the axis.  This looks at the "min" and
 "max" keys of the axis node.</p>

<h3>Parameters</h3>
axis - a JSONObject

<h3>Returns:</h3>
the axis range
<br><br>
<a href="https://github.com/autoplot/dev/search?q=getRange&unscoped_q=getRange">[search for examples]</a>
 <a href="https://github.com/autoplot/documentation/tree/master/javadoc/org/autoplot/pngwalk/RichPngUtil.md">[view on GitHub]</a>
 <a href="http://www-pw.physics.uiowa.edu/~jbf/autoplot/javadoc2018/org/autoplot/pngwalk/RichPngUtil.html#getRange">[view on old javadoc]</a>
<br>
<br>
<hr>
<a name="getXRange"></a>
<h2>getXRange</h2>
getXRange( <a href='https://docs.oracle.com/javase/8/docs/api/java/lang/String.html'>String</a> json ) &rarr; <a href='http://www-pw.physics.uiowa.edu/~jbf/autoplot/doc/org/das2/datum/DatumRange.html'>DatumRange</a>

<p>attempt to get the time range of the plots, looking at each x axis
 for a timerange.</p>

<h3>Parameters</h3>
json - rich png ascii string

<h3>Returns:</h3>
null or the range found.
<br><br>
<a href="https://github.com/autoplot/dev/search?q=getXRange&unscoped_q=getXRange">[search for examples]</a>
 <a href="https://github.com/autoplot/documentation/tree/master/javadoc/org/autoplot/pngwalk/RichPngUtil.md">[view on GitHub]</a>
 <a href="http://www-pw.physics.uiowa.edu/~jbf/autoplot/javadoc2018/org/autoplot/pngwalk/RichPngUtil.html#getXRange">[view on old javadoc]</a>
<br>
<br>