/* uDig - User Friendly Desktop Internet GIS client
* http://udig.refractions.net
* (C) 2004, Refractions Research Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* (http://www.eclipse.org/legal/epl-v10.html), and the Refractions BSD
* License v1.0 (http://udig.refractions.net/files/bsd3-v10.html).
*/
package org.locationtech.udig.tools.edit.enablement;
import java.io.IOException;
import java.util.Map;
import java.util.WeakHashMap;
import org.locationtech.udig.project.ILayer;
import org.locationtech.udig.project.ui.render.displayAdapter.MapMouseEvent;
import org.locationtech.udig.tools.edit.EditState;
import org.locationtech.udig.tools.edit.EditToolHandler;
import org.locationtech.udig.tools.edit.EnablementBehaviour;
import org.locationtech.udig.tools.edit.EventType;
import org.opengis.referencing.operation.MathTransform;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Envelope;
/**
* Sets the EditState to illegal if the Mouse moves into an area of the map where the layer is no
* longer valid as according to its CRS. In addition puts a warning on the StatusLine.
*
* @author Jesse
* @since 1.1.0
*/
public class WithinLegalLayerBoundsBehaviour implements EnablementBehaviour {
Map<ILayer, Envelope> cache = new WeakHashMap<ILayer, Envelope>();
private EditState previousState = EditState.NONE;
private boolean canTransformTo( ILayer selectedLayer, Coordinate world ) {
MathTransform t;
try {
t = selectedLayer.mapToLayerTransform();
} catch (IOException e1) {
throw (RuntimeException) new RuntimeException().initCause(e1);
}
try {
double[] dest = new double[2];
t.transform(new double[]{world.x, world.y}, 0, dest, 0, 1);
if( Double.isNaN(dest[0]) || Double.isNaN(dest[1])
|| Double.isInfinite(dest[0]) || Double.isInfinite(dest[1]))
return false;
return true;
} catch (Throwable throwable) {
return false;
}
}
public String isEnabled( EditToolHandler handler, MapMouseEvent e, EventType eventType ) {
if (eventType!=EventType.MOVED && eventType!=EventType.ENTERED)
return null;
ILayer editLayer = handler.getEditLayer();
Envelope env = cache.get(editLayer);
Coordinate world = handler.getContext().pixelToWorld(e.x, e.y);
if (env != null && env.contains(world)) {
} else {
if (canTransformTo(editLayer, world)) {
// ok its at least somewhat legal, we can transform to it so lets expand the legal
// envelope.
if (env == null) {
env = new Envelope();
}
env.expandToInclude(world);
} else
return "Cannot edit. Either in a bad projection for editing layer or out of the bounds for the layer";
}
return null;
}
}