tinylineapplet.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 com.tinyline.app;


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


import com.tinyline.tiny2d.*;
import com.tinyline.svg.*;


/**
 * The <tt>TinyLineApplet</tt> is the J2ME Personal Profile
 * implementation of the SVGT Viewer.
 * <p>
 * @author (C) Andrew Girow
 * @version 1.9
 * <p>
 */
public class TinyLineApplet extends Applet implements StatusBar
{
    String appletInfo = new String("TinyLine4Web 1.10 Copyright (C) 2002-2006 Andrew Girow. All rights reserved.");
    // The viewer size
    Dimension dim;
    // Bounds
    Rectangle canvasBounds;

    // The mouse event handler
    AppletMouseHandler currentMouseHandler;

    // SVG canvas!
    PPSVGCanvas canvas;

    Runtime r;

    // The svg file t be drawn
    String svgfile;


    /** Constructs the viewer */
    public TinyLineApplet()
    {
       setBackground(Color.white);
    }

    /** Returns information about this applet */
    public String getAppletInfo()
    {
       return appletInfo;
    }

    /* Returns the applet params */
    public String[][] getParameterInfo()
    {
        String as[][] =
        {
          {
             "svgfile", "url", "the SVG Tiny file"
          }
        };
        return as;
    }

    /**
     * Called by the browser or applet viewer to inform
     * this applet that it should start its execution. It is called after
     * the <code>init</code> method and each time the applet is revisited
     * in a Web page.
     */
    public void start()
    {
        canvas.start();
        try
        {
           URL url = new URL(getDocumentBase(),svgfile);
           canvas.goURL(url.toExternalForm());
           r.gc();
        }
        catch(Exception e)
        {
        }
    }

    /**
     * Called by the browser or applet viewer to inform
     * this applet that it should stop its execution. It is called when
     * the Web page that contains this applet has been replaced by
     * another page, and also just before the applet is to be destroyed.
     */
    public void stop()
    {
        if(canvas!= null) canvas.stop();
    }

    /**
     * Called by the browser or applet viewer to inform
     * this applet that it is being reclaimed and that it should destroy
     * any resources that it has allocated.
     */
    public void destroy()
    {
        if(canvas!= null) canvas.stop();
    }


    /**
     * Called by the browser or applet viewer to inform
     * this applet that it has been loaded into the system. It is always
     * called before the first time that the <code>start</code> method is
     * called.
     * <p>
     * Builds the viewer layout and inits the viewer
     * <p>
     */
    public void init()
    {
        r = Runtime.getRuntime();
        setLayout(null);
        dim = getSize();
        setBackground(new Color(184,200,216));

        // Calculates bounds
        canvasBounds = new Rectangle(0,0,dim.width,dim.height);

        // Creates the SVG canvas
        canvas = new PPSVGCanvas(canvasBounds.width,canvasBounds.height);
        canvas.setBounds(canvasBounds.x,canvasBounds.y,canvasBounds.width,canvasBounds.height);
        add(canvas);
        canvas.setStatusBar(this);

        // Sets the applet mouse handler
        currentMouseHandler = new AppletMouseHandler(canvas,this);
        currentMouseHandler.type = AppletMouseHandler.LINK_MOUSE;
        canvas.addMouseListener(currentMouseHandler);
        canvas.addMouseMotionListener(currentMouseHandler);
        // Gets graphics
        repaint(); ///????

        // Adds the default events listener
        PlayerListener defaultListener = new PlayerListener(canvas);
        canvas.addEventListener("default", defaultListener, false);

        // Loads the default font!!!
        SVGDocument doc = canvas.loadSVG(getClass().getResourceAsStream("/com/tinyline/app/images/helvetica_svg"));
        SVGFontElem font = SVGDocument.getFont(doc,SVG.VAL_DEFAULT_FONTFAMILY);
        SVGDocument.defaultFont = font;
        // Gets the 'svgfile' parameter
        svgfile = this.getParameter("svgfile");
    }

    /** Updates this viewer */
    public void update(Graphics g)
    {
        paint(g);
    }

    /** Shows an error message */
    public void alertError(String s)
    {
        System.out.println(s);
        showStatus(s);
    }
    /** Shows a wait message */
    public void alertWait(String s)
    {
        showStatus(s);
    }
    /** Shows an init message */
    public void alertInit(String s)
    {
        showStatus(s);
    }

    /** Shows an exteranal resource */
    public void showDocument(String s)
    {
        try
        {
           URL url = new URL(s);
           getAppletContext().showDocument(url);
        }
        catch(Exception e)
        {
        }
    }

    /**
     * Returns the PPSVGCanvas.
     * @return an PPSVGCanvas object.
     */
    public PPSVGCanvas getSVGCanvas()
    {
        return canvas;
    }

}