viewer.java

一个用Java写的

/******************************************************************
 * Copyright (C) 2002-2006 Andrew Girow. All rights reserved.     *
 * ---------------------------------------------------------------*
 * This software is published under the terms of the TinyLine     *
 * License, a copy of which has been included with this           *
 * distribution in the TINYLINE_LICENSE.TXT file.                 *
 *                                                                *
 * For more information on the TinyLine,                          *
 * please see <http://www.tinyline.com/>.                         *
 *****************************************************************/
package tinyapp;

import com.tinyline.svg.*;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.util.zip.*;
import java.awt.image.*;


/**
 * The <tt>Viewer</tt> application demostrates how to use the
 * TinyLine SVG Library for creating a very basic Static SVG Viewer.
 * <p>
 * @author (C) Andrew Girow
 * @version 1.10
 * <p>
 */
public class Viewer extends Frame implements ActionListener
{
    /** The Menu for the <tt>Viewer</tt>. */
    MenuBar menuBar1 = new MenuBar();
    Menu menuFile = new Menu();
    MenuItem pauseButton, refreshButton, exitButton, openButton;
    MenuItem linkButton, panButton, zoomInButton, zoomOutButton;
    MenuItem qualityButton;

    // Java mouse event handler
    MouseHandler mouseHandler;

    /** The <tt>MapViewer</tt> SVG canvas. */
    ViewerCanvas canvas;

    /**
     * Constructs a new <tt>MapViewer</tt> instance.
     */
    public Viewer()
    {
    }

    /** Builds the <tt>MapViewer</tt> layout. */
    public void init()
    {
      setTitle("Viewer");
      setBackground(SystemColor.control);
      setLayout(null);
      Dimension dim = getSize();
      setResizable(false);

      menuFile.setLabel("File");
      openButton    = new MenuItem("Open");
      openButton.addActionListener(this);
      menuFile.add(openButton);
      linkButton    = new MenuItem("Link");
      linkButton.addActionListener(this);
      menuFile.add(linkButton);
      panButton     = new MenuItem("Pan");
      panButton.addActionListener(this);
      menuFile.add(panButton);
      zoomInButton  = new MenuItem("Zoom In");
      zoomInButton.addActionListener(this);
      menuFile.add(zoomInButton);
      zoomOutButton = new MenuItem("Zoom Out");
      zoomOutButton.addActionListener(this);
      menuFile.add(zoomOutButton);
      refreshButton = new MenuItem("Original");
      refreshButton.addActionListener(this);
      menuFile.add(refreshButton);
      qualityButton = new MenuItem("Quality");
      qualityButton.addActionListener(this);
      menuFile.add(qualityButton);
      exitButton    = new MenuItem("Exit");
      exitButton.addActionListener(this);
      menuFile.add(exitButton);
      menuBar1.add(menuFile);
      setMenuBar(menuBar1);

      canvas = new ViewerCanvas(dim.width-10,dim.height-10);
      canvas.setBounds(5,5,dim.width-10,dim.height-10);
      add(canvas);

      // Sets the event listener
      mouseHandler = new MouseHandler(canvas);
      mouseHandler.type = MouseHandler.LINK_MOUSE;
      canvas.addMouseListener(mouseHandler);
      canvas.addMouseMotionListener(mouseHandler);

      // Loads the default font
System.out.println("canvas " + canvas);
      SVGDocument doc = canvas.loadSVG(getImage("images/helvetica.svg").toExternalForm());
      SVGFontElem font = SVGDocument.getFont(doc,SVG.VAL_DEFAULT_FONTFAMILY);
      SVGDocument.defaultFont = font;
    }

    /** Handles action events */
    public void actionPerformed(ActionEvent e)
    {
//        System.out.println(""+e);
        Object src = e.getSource();

        if(src == exitButton)
        {
           fileExit();
        }
        else if(src == openButton)
        {
           fileOpen();
        }
        else if(src == panButton)
        {
           mouseHandler.type = MouseHandler.PAN_MOUSE;
        }
        else if(src == zoomInButton)
        {
           mouseHandler.type = MouseHandler.ZOOM_IN_MOUSE;
        }
        else if(src == zoomOutButton)
        {
           mouseHandler.type = MouseHandler.ZOOM_OUT_MOUSE;
        }
        else if(src == linkButton)
        {
           mouseHandler.type = MouseHandler.LINK_MOUSE;
        }
        else if(src == refreshButton)
        {
           mouseHandler.type = MouseHandler.LINK_MOUSE;
           mouseHandler.origView();
        }
        else if(src == qualityButton)
        {
           mouseHandler.type = MouseHandler.LINK_MOUSE;
           mouseHandler.quality();
        }
    }

    /**
     * Performs the action defined for "File|Exit".
     */
    void fileExit()
    {
      System.exit(0);
    }

                /** Gets an image URL by name */
    private URL getImage(String name)
    {
        return getClass().getResource(name);
    }

                /** Open file dialog */
    private void fileOpen()
    {
        FileDialog fd = new FileDialog(this, "Load file", FileDialog.LOAD);
        if(fd == null ) return;
        fd.setModal(true);
        fd.setVisible(true);
        if (fd.getFile() != null)
        {

            File file = new File(fd.getDirectory(),fd.getFile());
            try
            {
               URL svgurl = new URL("file", "", slashify(file.getAbsolutePath(), file.isDirectory()));
               String documentUrl = svgurl.toExternalForm();
               canvas.goURL(documentUrl);
                                 Runtime.getRuntime().gc();
            }
            catch (Exception e)
            {
               return;
            }
        }
        fd = null;
    }

    /** Slashifies the path depends on the isDirectory flag */
    private static String slashify(String path, boolean isDirectory)
    {
        String p = path;
        if (File.separatorChar != '/')
        {
            p = p.replace(File.separatorChar, '/');
        }
        if (!p.startsWith("/"))
        {
                  p = "/" + p;
        }
        if (!p.endsWith("/") && isDirectory)
        {
                  p = p + "/";
        }
              return p;
    }

    /**
     * Main. Runs the MapViewer sample appplication
     */
    public static void main(String[] args)
    {
        Viewer frame = new Viewer();
        // Typical iPAQ or Zaurus dimentions 240 * 320
        frame.setBounds(0,0,240,320);
        // For desktops is better 480 * 480
//      frame.setBounds(0,0,480,480);
        frame.init();
        frame.setVisible(true);
    }
}