mapperclientapplet.java

利用mapxtreme java的实现的WebGis

// Decompiled by Jad v1.5.7. Copyright 1997-99 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) 
// Source File Name:   MapperClientApplet.java

import java.applet.Applet;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;

public class MapperClientApplet extends Applet
{
    class MCanvas extends Canvas
    {

        void setImage(Image i)
        {
            m_bufferedImage = i;
        }

        public void paint(Graphics g)
        {
            if(m_bufferedImage != null && g != null)
                g.drawImage(m_bufferedImage, 0, 0, this);
        }

        public boolean imageUpdate(Image img, int infoflag, int x, int y, int width, int height)
        {
            boolean result = true;
            if((infoflag & 0xc0) != 0)
            {
                result = false;
            }
            else
            {
                if((infoflag & 0x20) != 0)
                    result = false;
                repaint();
            }
            return result;
        }

        public void update(Graphics g)
        {
            paint(g);
        }

        Image m_bufferedImage;

        MCanvas()
        {
            m_bufferedImage = null;
        }
    }


    public MapperClientApplet()
    {
        m_tool = "0";
        m_isStandalone = false;
        m_zoomIn = new Button();
        m_zoomOut = new Button();
        m_pan = new Button();
        m_map = new MCanvas();
    }

    public String getParameter(String key, String def)
    {
        return m_isStandalone ? System.getProperty(key, def) : getParameter(key) == null ? def : getParameter(key);
    }

    public void init()
    {
        String strParm = getParameter("servleturl");
        if(strParm != null && strParm.length() > 1)
            m_servletName = strParm;
        setBackground(Color.white);
        m_zoomIn.setBounds(new Rectangle(50, 8, 80, 35));
        m_zoomIn.setLabel("ZoomIn");
        m_zoomIn.addMouseListener(new MouseAdapter() {

            public void mouseClicked(MouseEvent e)
            {
                m_tool = "1";
            }

        });
        m_zoomOut.setBounds(new Rectangle(200, 8, 80, 35));
        m_zoomOut.setLabel("ZoomOut");
        m_zoomOut.addMouseListener(new MouseAdapter() {

            public void mouseClicked(MouseEvent e)
            {
                m_tool = "2";
            }

        });
        m_pan.setBounds(new Rectangle(350, 8, 80, 35));
        m_pan.setLabel("Pan");
        m_map.setBounds(new Rectangle(0, 50, 500, 500));
        m_map.setBackground(Color.white);
        m_map.addMouseListener(new MouseAdapter() {

            public void mouseClicked(MouseEvent e)
            {
                String url = m_sessionURL;
                url = url + "?ptx=" + new Integer(e.getX());
                url = url + "&pty=" + new Integer(e.getY());
                url = url + "&tool=" + m_tool;
                adjustMap(url);
            }

        });
        m_pan.addMouseListener(new MouseAdapter() {

            public void mouseClicked(MouseEvent e)
            {
                m_tool = "3";
            }

        });
        setLayout(null);
        add(m_zoomIn, null);
        add(m_zoomOut, null);
        add(m_pan, null);
        add(m_map, null);
        try
        {
            initMap();
            adjustMap(m_sessionURL);
        }
        catch(Exception e)
        {
            System.out.println(e.toString());
        }
    }

    public String getAppletInfo()
    {
        return "Applet Information";
    }

    void adjustMap(String url)
    {
        try
        {
            byte img[] = new byte[m_map.getPreferredSize().width * m_map.getPreferredSize().height * 2];
            URL mapServer = new URL(url);
            System.out.println("url: " + mapServer);
            URLConnection s = mapServer.openConnection();
            DataInputStream in = new DataInputStream(s.getInputStream());
            try
            {
                in.readFully(img);
            }
            catch(EOFException eofexception) { }
            in.close();
            m_map.setImage(getToolkit().createImage(img));
            m_map.repaint();
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
    }

    void initMap()
    {
        try
        {
            String url = m_servletName + "?init=true";
            URL mapServer = new URL(url);
            URLConnection s = mapServer.openConnection();
            BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
            String inputLine;
            if((inputLine = in.readLine()) != null)
            {
                m_sessionURL = inputLine;
                System.out.println("Received: " + inputLine);
            }
            in.close();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }

    private static String m_servletName = "http://localhost:8080/samples45/servlet/mapper";
    private String m_sessionURL;
    private String m_tool;
    private final String NO_TOOL = "0";
    private final String ZOOM_IN_TOOL = "1";
    private final String ZOOM_OUT_TOOL = "2";
    private final String PAN_TOOL = "3";
    private boolean m_isStandalone;
    private Button m_zoomIn;
    private Button m_zoomOut;
    private Button m_pan;
    private MCanvas m_map;




}