alganimframe.java

java算法大全

/* AlgAnimFrame.java */

import java.awt.*;
import java.applet.*;
import java.io.*;
import java.net.*;

/**
 * The <code>AlgAnimFrame</code> class is a top-level window with a title
 * and border. The layout used is BorderLayout. There is a menubar
 * created at the north part of the panel. The drawing panel is at the
 * center and a commentary panel is located at the south.
 * <p>
 * This extended frame class holds a set references to the panel/frame objects
 * used in the algorithm animation.
 * @see Frame
 */
public class AlgAnimFrame extends Frame {
    private AlgAnimApp parentApp;
    private URL sourceURL;
    private String algname;
    private AlgThread alg = null;
    private int delay = 200;
    //changed this..
    //private Panel panel;
    private DrawingPanel dpBefore, dpAfter;
    private FlowPanel panel;
    //private DataPanel dataPanel;

    private TextFrame tf;
    private ComPanel cpanel;
    private boolean step = false, stepWait = false;
    private Dimension frameSize = new Dimension(850, 700);

    // control panel
    private MenuItem quitItem;
    private Button runItem, stopItem, stepItem, skipItem;
    private CheckboxMenuItem enableAnim, disableAnim; 
    private CheckboxMenuItem[] dataChoice, delayChoice;
    private Menu dataMenu, delayMenu;
    private int dataSelected = 0;
    private boolean noAnim = false;
    Font helv10 = new Font("Helvetica", Font.PLAIN, 10);
    private Font helv14 = new Font("Helvetica", Font.PLAIN, 14);
    Font helv18 = new Font("Helvetica", Font.PLAIN, 18);
    Font helv24 = new Font("Helvetica", Font.PLAIN, 24);
    private ControlPanel cp = null;

    /**
     * Creates and shows the frame consists of a drawing panel, commentary
     * panel and control panel. The text frame is now displayed on a separate
     * window.
     * @param parentApp The applet which results in the creation of this frame
     * @param sourceURL The URL of the source code to be displayed on the text
     * frame
     * @see URL
     */
    public AlgAnimFrame(AlgAnimApp parentApp, URL sourceURL) {
        this.parentApp = parentApp;
        this.sourceURL = sourceURL;
        this.algname = parentApp.getParameter("algname");

	dpBefore = new DrawingPanel();
	dpAfter = new DrawingPanel();
	//dataPanel = new DataPanel();

        setTitle(algname);
	move(0, 0);
        alg = new AlgThread(this);

        setLayout( new BorderLayout() );

	setFont(helv14);
	cp = new ControlPanel(this, algname);
	add("North", cp);
	runItem = cp.getRunButton();
	stopItem = cp.getStopButton();
	stepItem = cp.getStepButton();
	skipItem = cp.getSkipButton();

	//changed...
	panel = new FlowPanel(this);
        add("Center", panel);

        /* Source panel */
        tf = new TextFrame( sourceURL );
	
        /* Commentary panel */
        cpanel = new ComPanel( algname, 1 );
        add( "South", cpanel );
 
	setMenuBar(createMenuBar());
	setMenuBar(createMenuBar());

        // generate initial data set
        alg.generateData();

        pack();
        validate();
        show();
	//if (tf.getTextPanel().getNumLines() > 0)
	    //tf.toFront();
	cp.refreshButtons();
    } // init()

    private MenuBar createMenuBar() {
	MenuBar mb = new MenuBar();

	mb.setFont(helv14);
	dataMenu = new Menu("Select");
	mb.add(dataMenu);
	dataChoice = new CheckboxMenuItem[alg.dataSets.length];
	for (int i = 0; i < alg.dataSets.length; i++) {
	    dataChoice[i] = new CheckboxMenuItem(alg.dataSets[i]);
	    dataMenu.add(dataChoice[i]);
	}
	if (alg.dataSets.length > 0)
	    dataChoice[0].setState(true);
	dataMenu.addSeparator();
	quitItem = new MenuItem("Quit");
	dataMenu.add(quitItem);

	/*
	Menu algMenu = new Menu("Algorithm", true);
	mb.add(algMenu);
	runItem = new MenuItem("Run " + algname);
	stopItem = new MenuItem("Stop " + algname);
	stepItem = new MenuItem("Next Step...");
	skipItem = new MenuItem("Skip...");
	algMenu.add(runItem);
	algMenu.add(stopItem);
	algMenu.add(stepItem);
	algMenu.add(skipItem);
	*/

	Menu animMenu = new Menu("Animation");
	mb.add(animMenu);
	enableAnim = new CheckboxMenuItem("Enable");
	enableAnim.setState(true);
	disableAnim = new CheckboxMenuItem("Disable");
	animMenu.add(enableAnim);
	animMenu.add(disableAnim);
	animMenu.addSeparator();
	delayMenu = new Menu("Delay");
	animMenu.add(delayMenu);
	delayChoice = new CheckboxMenuItem[5];
	for (int i = 0; i < 5; i++) {
	    delayChoice[i] = 
		new CheckboxMenuItem(""+((i+1)*200)+"msec");
	    delayMenu.add(delayChoice[i]);
	}
	delayChoice[0].setState(true);

	Menu viewMenu = new Menu("View");
	mb.add(viewMenu);
	MenuItem srcCode = new MenuItem("Source Code");
	if (tf.getTextPanel().getNumLines() < 1)
	    srcCode.disable();
	viewMenu.add(new MenuItem("Source Code"));
	//viewMenu.add(new MenuItem("Commentary Panel"));

	Menu helpMenu = new Menu("About");
	mb.setHelpMenu(helpMenu);
	helpMenu.add(new MenuItem("Credits"));
	helpMenu.add(new MenuItem("Copyrights"));

	return mb;
    } // createMenuBar()

    /**
     * Returns the preferred size of the frame. By default, it is set
     * to 850x700. It can be modified based on the specific application.
     * @return the dimension of the frame
     */
    public Dimension preferredSize() {
        return frameSize;
    }

    /**
     * Sets the size of the frame.
     * @param size The desired sized of the frame.
     */
    public void setDimension(Dimension size) {
	this.frameSize = size;
    }

    /**
     * Event handler of the frame. The main purpose of this method is to
     * perform the cleanup statements upon receival of the WINDOW_DESTROY
     * event message.
     */
    public boolean handleEvent(Event event) {
	if (cp != null) 
	    cp.refreshButtons();
        if (event.id == Event.WINDOW_DESTROY) {
            if (alg != null) {
              alg.dpAfter = null;
              if (alg.isAlive())
                alg.stop();
            }
            parentApp.start_button.enable();
	    tf.dispose();
            dispose();
        } 
        return super.handleEvent(event);
    }

    /**
     * Action handler for the buttons and choice buttons in the control
     * panel.
     * @param e Event invoked
     * @param arg Object that invokes the event
     */
    public boolean action(Event e, Object arg) {
        Object target = e.target;
 
        if (target == quitItem) {
            getApplet().start_button.enable();
            if (getAlg() != null && getAlg().isAlive())
                getAlg().stop();
            getTextFrame().dispose();
            dispose();
        } else if (target instanceof CheckboxMenuItem) {
	    Menu parent = (Menu)((MenuItem)target).getParent();
	    if (parent == dataMenu) {
	        for (int i = 0; i < dataChoice.length; i++) {
		    if (target == dataChoice[i]) {
		        dataSelected = i;
			alg.generateData();
			dataChoice[i].setState(true);
		    } else
			dataChoice[i].setState(false);
	        }
	    } else if (parent == delayMenu) {
		for (int i = 0; i < delayChoice.length; i++) {
		    if (target == delayChoice[i]) {
			setDelay((i+1)*200);
			getAlg().setDelay(getDelay());
                	setText(0, "Animation delay now set to " + 
					getDelay()
                        		+ " msec...");
			delayChoice[i].setState(true);
		    } else
			delayChoice[i].setState(false);
		}
	    } else { // parent is Animation.. -> enable/disable anim
		if (target == enableAnim) {
		    disableAnim.setState(!enableAnim.getState());
		    noAnim = false;
		    dpAfter.setNoAnim(noAnim);
		} else if (target == disableAnim) {
		    enableAnim.setState(!disableAnim.getState());
		    noAnim = true;
		    dpAfter.setNoAnim(noAnim);
		}
	    }
        } else {
	    if (target instanceof MenuItem) {
		String text = ((MenuItem)target).getLabel();
		if (text.trim().equals("Source Code")) {
		    tf.show();
		    tf.toFront();
		} else if (text.trim().equals("Credits")) {
		   setText(0, "Author: Woi L Ang   Supervised by: John Morris");
		} else if (text.trim().equals("Copyrights")) {
		   setText(0, "Copyright (c) 1998 The Department of Electrical and Electronic Engineering. University of Western Australia");
		}
	    }
	}
        return false;
    } // action()


    /**
     * Sets the text string to be displayed on a specific text field on the
     * commentary panel return from <code>getComPanel</code>.