/*
 * Created on July 23, 2003
 *
 * Copyright© NGI Systems 2003
 */
package roim.geoviewer.mousemode;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Point;
import java.awt.event.MouseEvent;

import javax.swing.ImageIcon;

import com.bbn.openmap.LatLonPoint;
import com.bbn.openmap.MapBean;
import com.bbn.openmap.event.AbstractMouseMode;
import com.bbn.openmap.event.CenterEvent;
import com.bbn.openmap.event.PaintListener;

/**
 * @author Brian Hudson
 *
 * PanMouseMode
 */
public class PanMouseMode extends AbstractMouseMode implements PaintListener {

	public final static transient String modeID = "Pan";

	protected Point _initialMousePoint; // Initial Mouse Position
	protected Point _mousePoint;        // Current Mouse Position
	protected Point _startPoint;        // Top Left Hand Corner of Map Image
	protected Image _mapImage;          // Image of the Map
	protected Image _completeImage;     // Image of Map and Background
	protected ImageIcon _iiCursor;      // Cursor Image
	protected int _lastButton;          // The last mouse button that was pressed

	public PanMouseMode() {
		this(true);
	}

	public PanMouseMode(boolean shouldConsumeEvents) {
		super(modeID, shouldConsumeEvents);
		try {
			java.net.URL url = this.getClass().getResource("cursors/pan.gif");
			setModeCursor(ui.CursorFactory.createCursor(url, "Pan", new Point(8, 10)));
		}
		catch (Exception x) {
			x.printStackTrace();
		}
	}

	public void mousePressed(MouseEvent e) {
		MapBean map = (MapBean)e.getSource();

		_lastButton = e.getButton();
		if (_lastButton == MouseEvent.BUTTON1) {
			_startPoint = new Point(0, 0);
			_mousePoint = e.getPoint();
			_initialMousePoint = e.getPoint();

			_mapImage = map.createImage(map.getWidth(), map.getHeight());
			_completeImage = map.createImage(map.getWidth(), map.getHeight());
			map.paint(_mapImage.getGraphics());
		}
		else if (_lastButton == MouseEvent.BUTTON3) {
			LatLonPoint point = map.getCoordinates(e);
			map.center(new CenterEvent(this, point.getLatitude(), point.getLongitude()));
		}
	}

	public void mouseDragged(MouseEvent e) {
		if (_lastButton == MouseEvent.BUTTON1) {
			MapBean map = (MapBean)e.getSource();
			Graphics mapG = map.getGraphics();

			// Calc Delta
			Point deltaPoint = new Point((int) (_mousePoint.getX() - e.getX()), (int) (_mousePoint.getY() - e.getY()));
			_startPoint = new Point((int) (_startPoint.getX() - deltaPoint.getX()), (int) (_startPoint.getY() - deltaPoint.getY()));

			Graphics g = _completeImage.getGraphics();
			g.setColor((Color)map.getBckgrnd());
			g.fillRect(0, 0, map.getWidth(), map.getHeight());
			g.drawImage(_mapImage, (int)_startPoint.getX(), (int)_startPoint.getY(), map.getWidth(), map.getHeight(), map);

			mapG.drawImage(_completeImage, 0, 0, map.getWidth(), map.getHeight(), map);

			_mousePoint = e.getPoint();
		}
	}

	public void mouseReleased(MouseEvent e) {
		if (e.getButton() == MouseEvent.BUTTON1) {
			MapBean map = (MapBean)e.getSource();
			LatLonPoint initialLLP = map.getProjection().inverse((int)_initialMousePoint.getX(), (int)_initialMousePoint.getY());
			LatLonPoint finalLLP = map.getCoordinates(e);
			float deltaLat = initialLLP.getLatitude() - finalLLP.getLatitude();
			float deltaLon = initialLLP.getLongitude() - finalLLP.getLongitude();
			LatLonPoint center = map.getCenter();
			center.setLatitude(center.getLatitude() + deltaLat);
			center.setLongitude(center.getLongitude() + deltaLon);
			map.setCenter(center);
			
			_mapImage = null;
			_completeImage = null;
		}
	}
}