//// BaseApplet - An applet with an offscreen image for drawing into, and a few//            other kooky things that turned out to be useful.//            Created from mdb's DBApplet class.//// $Id: BaseApplet.java,v 1.0 1996/12/16 09:09:38 wfk Exp $import java.applet.Applet;import java.awt.Color;import java.awt.Dimension;import java.awt.Event;import java.awt.Font;import java.awt.FontMetrics;import java.awt.Graphics;import java.awt.Image;public abstract class Template extends Applet implements Runnable{    //    // BaseApplet public member functions    public void init ()    {        int fontSize;        Dimension d = size();	    try {	        fontSize = Integer.parseInt(getParameter("fontsize"));	    } catch (NumberFormatException e) {	        fontSize = 10;	    }	    defaultFont = new Font("Helvetica", Font.PLAIN, fontSize);        _offImage = createImage(d.width, d.height);        _offGraphics = _offImage.getGraphics();        // clear out the background        _offGraphics.setColor(Color.white);        _offGraphics.fillRect(0, 0, d.width, d.height);        _offGraphics.setColor(Color.black);        _offGraphics.setFont(defaultFont);        // get some graphics stuff        _metrics = _offGraphics.getFontMetrics();        _height = _metrics.getHeight();	    _ascent = _metrics.getAscent();	    _descent = _metrics.getDescent();    }    public void start ()    {    }    public void stop ()    {    }    public abstract void run ();    public void update (Graphics g)    {        g.drawImage(_offImage, 0, 0, null);    }    public void paint (Graphics g)    {        g.drawImage(_offImage, 0, 0, null);    }    public void title (String line1, String line2)    {        Dimension d = size();        int width = _metrics.stringWidth(line1);        _offGraphics.drawString(line1, (d.width/3)+15, 5 + _ascent);        width = _metrics.stringWidth(line2);        _offGraphics.drawString(line2, (d.width/3)+15, 5 + _ascent + _height);    }    public void message (String line1, String line2, String line3,		  String line4)    {	Dimension d = size();        _mwidth = Math.max(_metrics.stringWidth(line1),                           _metrics.stringWidth(line2));        _offGraphics.drawString(line1, 5, 5+_ascent);        _offGraphics.drawString(line2, 5, 5+_ascent+_height);        _offGraphics.drawString(line3, 5, d.height - (_ascent + _height));        _offGraphics.drawString(line4, 5, d.height - _ascent);    }    public void clearMessage ()    {	Dimension d = size();        _offGraphics.setColor(Color.white);        _offGraphics.fillRect(5, 5, 5+_mwidth, 5+_ascent+_height);        _offGraphics.fillRect(5, d.height - (_ascent+_height),	  5 + d.width, 5+_ascent+(2*_height));        _offGraphics.setColor(Color.black);    }    //    // BaseApplet protected data members    Image _offImage;    Graphics _offGraphics;    Font defaultFont;    FontMetrics _metrics;    int _height;    int _ascent;    int _descent;    int _mwidth;    /* Following are workarounds for font size calculations, as Netscape     * reports unappealing font height/ascents on varying platforms. */    static final int FIXED_FONT_HEIGHT = 18;    static final int FIXED_FONT_ASCENT = 9;    String _srcString;               // original input string    StringBuffer _workString;        // current work string};