/* AlgAnimFrame.java */import java.awt.*;import java.applet.*;import java.io.*;import java.net.*;public class AlgAnimFrame extends Frame {    AlgAnimApp parentApp;    URL sourceURL;    String algname;    AlgThread alg = null;    int delay = 200;    Panel drawingPanel;    TextFrame tf;    ComPanel cpanel;    ControlPanel control_panel;    Scrollbar vScrollbar;    boolean step = false, stepWait = false;    public AlgAnimFrame(AlgAnimApp parentApp, URL sourceURL) {        this.parentApp = parentApp;        this.sourceURL = sourceURL;        this.algname = parentApp.getParameter("algname");        setTitle(algname);        alg = new AlgThread(this);        // Arrange panels within frame        GridBagLayout gb = new GridBagLayout();        GridBagConstraints gc = new GridBagConstraints();        setLayout( gb );        gc.fill = GridBagConstraints.BOTH;        gc.gridwidth = GridBagConstraints.RELATIVE;        /* Give any extra space to the animation panel */        gc.weighty = 1.0;        gc.weightx = 1.0;        gc.gridx = 0; gc.gridy = 0;        gb.setConstraints( drawingPanel, gc );        add(drawingPanel);        /* Source panel */	Panel p = new Panel();        tf = new TextFrame( sourceURL, sourceURL.getFile() );	vScrollbar = new Scrollbar(Scrollbar.VERTICAL);	vScrollbar.setValues(0, 10, 0, 90);	vScrollbar.setPageIncrement(10);	p.setLayout(new BorderLayout());	p.add("Center", tf);	p.add("East", vScrollbar);	p.validate();	        gc.gridx = GridBagConstraints.RELATIVE; gc.gridy = 0;        /* The text panel's requirements are known and fixed */        gc.weightx = 1.0;        gc.gridwidth = GridBagConstraints.REMAINDER;        gb.setConstraints( p, gc );        add( p );         /* Commentary panel */        gc.gridwidth = GridBagConstraints.RELATIVE;        gc.gridx = 0; gc.gridy = GridBagConstraints.RELATIVE;        gc.weighty = 0.0;        gc.gridheight = GridBagConstraints.REMAINDER;        cpanel = new ComPanel( algname, 3 );        gb.setConstraints( cpanel, gc );        add( cpanel );         /* Control panel */        control_panel = new ControlPanel(this, algname);        gc.gridx = gc.gridy = GridBagConstraints.RELATIVE;        gc.gridwidth = GridBagConstraints.REMAINDER;        gb.setConstraints( control_panel, gc );        add( control_panel );        // generate initial data set        // alg.generateData();        pack();        validate();        show();    } // init()    public Dimension preferredSize() {        return new Dimension(960,768);    }    public boolean handleEvent(Event event) {        if (event.id == Event.WINDOW_DESTROY) {            if (alg != null) {              alg.drawingPanel = null;              if (alg.isAlive())                alg.stop();            }            dispose();            parentApp.start_button.enable();        } else if (event.target == vScrollbar) {	    switch (event.id) {		case Event.SCROLL_LINE_UP:		case Event.SCROLL_LINE_DOWN:		case Event.SCROLL_PAGE_UP:		case Event.SCROLL_PAGE_DOWN:		case Event.SCROLL_ABSOLUTE:		    int val = ((Scrollbar)(event.target)).getValue();		    int min = ((Scrollbar)(event.target)).getMinimum();		    int max = ((Scrollbar)(event.target)).getMaximum();		    tf.setStart(val*tf.n_lines/(max - min + 10));		    //System.out.println(((Integer)event.arg).intValue());		    tf.repaint();	    }	}        return super.handleEvent(event);    }    public void setText( int n, String s ) {        cpanel.setText( n, s );    }     public void Highlight( int n ) {        tf.Highlight(n);	int numLineVisible = tf.size().height/tf.line_space;		if ( (n < (tf.start + 2)) || (n > (tf.start + numLineVisible - 2))) {	    int max = vScrollbar.getMaximum();	    int min = vScrollbar.getMinimum();	    int startLine = n - numLineVisible/2;	    if (startLine > 0) {	    	tf.setStart(startLine);	    	vScrollbar.setValue(startLine * (max - min) / tf.n_lines);	    } else {	    	tf.setStart(0);	    	vScrollbar.setValue(0);	    }	}	try {	    Thread.sleep(delay);	} catch (InterruptedException e) {}    }    public void restoreDrawingPanelColor() {        alg.restoreDrawingPanelColor();    }    public void startAlg() {	if (alg.isAlive() && !stepWait) {	    alg.stop();	    alg = new AlgThread(this);	    alg.start();	} else if (alg.isAlive() && stepWait) {	    //alg.resume();	    //System.out.println("alive");	    step = true;	    stepWait = false;	} else { // alg.isAlive() == false	    alg = new AlgThread(this);	    alg.start();	}	if (!stepWait) {	    control_panel.run_button.disable();	    control_panel.data_choice.disable();	    control_panel.stop_button.enable();	    control_panel.step_button.enable();	}    }    public void finishAlg() {        control_panel.stop_button.disable();        control_panel.run_button.enable();        control_panel.data_choice.enable();	control_panel.step_button.enable(); step = false;        alg.restoreDrawingPanelColor();    }        public void waitStep() {	if (step) {	    control_panel.setText("Click NEXT STEP...");	    control_panel.step_button.enable();	    control_panel.repaint();	    step = false; stepWait = true;	    while (!step) {		try {		    Thread.sleep(100);		} catch (InterruptedException e) {}	    }	    if (!stepWait)		step = false;	}    }        public void setStep(boolean step) {	//setText(2, "Stepping through the next line(s)...");	this.step = step;        control_panel.stop_button.disable();        control_panel.run_button.enable();        control_panel.data_choice.enable();	if (step) {	    control_panel.step_button.disable();		    stepWait = true;	} else 	    stepWait = false;    }} // class AlgAnimApp