/*
* GISToolkit - Geographical Information System Toolkit
* (C) 2002, Ithaqua Enterprises Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
package gistoolkit.application.command;
import gistoolkit.application.*;
import gistoolkit.features.*;
import gistoolkit.display.GISDisplay;
import gistoolkit.display.DrawModel;
import gistoolkit.display.drawmodel.ClickPointModel;
/**
* Command to center the map where the user clicks.
*/
public class CenterOnPointCommand extends SimpleCommand{
/** The identifying name for this command */
public static String getName(){return "Center";}
/**
* CenterOnPointCommand constructor comment.
*/
public CenterOnPointCommand(GISEditor inEditor) {
super(getName(), getIcon("Center.gif"), inEditor);
putValue(SHORT_DESCRIPTION, "Center the map.");
putValue(LONG_DESCRIPTION, "Center the map on the click location.");
}
public void execute() {
GISDisplay tempDisplay = getGISDisplay();
if (tempDisplay != null) {
tempDisplay.setDrawModel(new ClickPointModel(this));
}
}
public void executeDraw(DrawModel inDrawModel) {
if (inDrawModel instanceof ClickPointModel) {
ClickPointModel tempClickPointModel = (ClickPointModel) inDrawModel;
Point tempPoint = tempClickPointModel.getPoint();
if (tempPoint != null){
centerOnPoint(tempPoint);
}
}
}
private void centerOnPoint(gistoolkit.features.Point p) {
// draw the map on the buffer
Envelope tempMapEnvelope = getGISDisplay().getEnvelope();
double xOffset = tempMapEnvelope.getWidth() / 2;
double yOffset = tempMapEnvelope.getHeight() / 2;
Envelope tempNewEnvelope = new Envelope(
p.getX() - xOffset,
p.getY() - yOffset,
p.getX() + xOffset,
p.getY() + yOffset);
try {
getGISDisplay().setEnvelope(tempNewEnvelope);
}
catch (Exception ex) {
}
}
}