# label: Show Max
# title: Show the maximum value within a box selection
# description: Add a mouse module to the first plot's renderer that takes its dataset and prints the maximum value within the selected box.

dom= getDocumentModel()
plot= dom.plots[0].controller.dasPlot

from org.das2.event import BoxSelectorMouseModule

mm= BoxSelectorMouseModule.create( plot, 'show max' )

from org.virbo.dataset import DataSetUtil, SemanticOps
from javax.swing import JOptionPane

def boxSelected(event):
    xrange= event.XRange
    yrange= event.YRange
    ds= plot.getRenderer(0).dataSet
    if ( ds==None ): return
    isQube= DataSetUtil.isQube(ds);
    if ( isQube ):
       tds=SemanticOps.trim( ds, xrange, yrange )
    else:
       tds=SemanticOps.trim( ds, xrange, null )  # this may cause problems else where...    
    if ( tds.length()==0 ):
       # do nothing
       return
    max= -1e38
    iter= org.virbo.dataset.QubeDataSetIterator( tds )
    while ( iter.hasNext() ):
       iter.next()
       v= iter.getValue(tds)
       if ( v>max ):
          max= v
    JOptionPane.showMessageDialog( None, 'max=%f' % ( max ) )
    
mm.BoxSelected=boxSelected

plot.dasMouseInputAdapter.primaryModule= mm