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* Copyright (c) 2016 Metron, Inc.
 
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package com.metsci.glimpse.charts.slippy;

import com.metsci.glimpse.axis.Axis1D;
import com.metsci.glimpse.axis.Axis2D;
import com.metsci.glimpse.axis.listener.AxisListener2D;
import com.metsci.glimpse.util.geo.projection.GeoProjection;

/**
 
* Initializes the Axis2D so that zoom events always go up/down a single zoom level.
 
* This is more important for the map tiles than for the imagery.
 
*
 
* @author ulman
 
*/

public class SlippyAxisListener2D extends SlippyAxisMouseListener2D implements AxisListener2D
{
    
public SlippyAxisListener2D( GeoProjection geoProj )
    
{
        
super( geoProj );
    
}

    
@Override
    
public void axisUpdated( Axis2D axis )
    
{
        
//TODO It's possible that these children could come from different
        
//
     
parent Axis2D if the SlippyMapPainter is being used in multiple

        
//
     
GlimpseLayouts. I'm not sure whether this would be a problem
        
//
     
in practice, but it's not really an issue since SlippyMapPainter

        
//
     
isn't intended to work with painter re-targeting anyway.

        
Axis1D childX = getInitializedChild( axis.getAxisX( ) );
        
Axis1D childY = getInitializedChild( axis.getAxisY( ) );

        
if ( childX != null && childY != null )
        
{
            
// only fire once to setup initial axis zoom level, then remove ourself as a listener
            
axis.removeAxisListener( this );

            
this.update( new Axis2D( childX, childY ), 0, true );

            
int centerX = childX.getSizePixels( ) / 2;
            
int centerY = childY.getSizePixels( ) / 2;

            
this.zoom( childX, true, 0, centerX, centerY );
            
this.zoom( childY, false, 0, centerX, centerY );
            
this.applyAndUpdate( childX, childY );
        
}
    
}

    
protected Axis1D getInitializedChild( Axis1D parent )
    
{
        
for ( Axis1D child : parent.getChildren( ) )
        
{
            
if ( child.isInitialized( ) )
            
{
                
return child;
            
}
        
}

        
return null;
    
}
}