panevent.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

// **********************************************************************
// 
// <copyright>
// 
//  BBN Technologies
//  10 Moulton Street
//  Cambridge, MA 02138
//  [phone]
// 
//  Copyright (C) BBNT Solutions LLC. All rights reserved.
// 
// </copyright>
// **********************************************************************
// 
// $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/event/PanEvent.java,v $
// $RCSfile: PanEvent.java,v $
// $Revision: 1.2.2.1 $
// $Date: 2004/10/14 18:26:46 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.event;

/**
 * An event to request the map to pan. Event designates the direction
 * and magnitude (relative to map dimensions) to pan the map.
 */
public class PanEvent extends java.util.EventObject {
    /**
     * Marks the first integer id for the range of pan event
     * directions.
     */
    public static final int PAN_FIRST = 1300;

    /**
     * Marks the last integer id for the range of pan event
     * directions.
     */
    public static final int PAN_LAST = 1307;

    /**
     * The possible pan directions
     */
    public static final int NORTH = 1300;
    public static final int NORTH_EAST = 1301;
    public static final int EAST = 1302;
    public static final int SOUTH_EAST = 1303;
    public static final int SOUTH = 1304;
    public static final int SOUTH_WEST = 1305;
    public static final int WEST = 1306;
    public static final int NORTH_WEST = 1307;

    protected float Az;
    protected float c;

    /**
     * Create a PanEvent with source Object and direction.
     * <p>
     * 
     * @param source Object
     * @param direction N, NE, E, SE, S, SW, W, NW
     * @deprecated use new panning semantics
     */
    public PanEvent(Object source, int direction) {
        this(source, dir2Az(direction), Float.NaN);
    }

    /**
     * Create a PanEvent with source Object and direction.
     * <p>
     * 
     * @param source Object
     * @param direction N, NE, E, SE, S, SW, W, NW
     * @param amount 0.0 &lt;= x &lt;= 1.0
     * @deprecated use new panning semantics
     */
    public PanEvent(Object source, int direction, float amount) {
        this(source, dir2Az(direction), Float.NaN);
    }

    /**
     * Create a PanEvent.
     * <ul>
     * <li><code>pan(