alganimframe.java

java算法大全

     * @see AlgAnimFrame#getComPanel
     * @param n The text field to display the string. First is <b>0</b>.
     * @param s The string to be displayed.
     */
    public void setText( int n, String s ) {
        cpanel.setText( n, s );
    }
 
    /**
     * Highlights the specified line of the source code on the text panel.
     * If the line is beyond the scroll pane, it will be scrolled to the
     * center of the window.
     * @param n The line to be highlighted.
     */
    public void Highlight( int n ) {
	if (tf.getTextPanel().getNumLines() < 1) return;
	if (!((Component)tf).isShowing()) return;
        tf.getTextPanel().Highlight(n);
	int numLineVisible = 
	    tf.getTextPanel().size().height/tf.getTextPanel().getLineSpace();
	
	if ( (n < (tf.getTextPanel().getStart() + 2)) || 
		(n > (tf.getTextPanel().getStart() + numLineVisible - 2))) {
	    int max = tf.getVertScrollbar().getMaximum();
	    int min = tf.getVertScrollbar().getMinimum();
	    int startLine = n - numLineVisible/2;
	    if (startLine > 0) {
	    	tf.getTextPanel().setStart(startLine);
	    	tf.getVertScrollbar().setValue(startLine * (max - min) / 
			tf.getTextPanel().getNumLines());
	    } else {
	    	tf.getTextPanel().setStart(0);
	    	tf.getVertScrollbar().setValue(0);
	    }
	}
	try {
	    Thread.sleep(delay/4);
	} catch (InterruptedException e) {}
    }

    /**
     * Restore the drawing panel at the end of the animation or during
     * initialization.
     */
    public void restoreDrawingPanel() {
        alg.restoreDrawingPanel();
    }

    /**
     * Start the animation algorithm if the <b>run</b> or <b>step</b>
     * button is pressed.
     */
    public void startAlg() {
	if (!stepWait) {
	    ((ImageButton)runItem).setDisable();
	    dataMenu.disable();
	}
	((ImageButton)stopItem).setEnable();
	((ImageButton)stepItem).setEnable();

	if (alg.isAlive() && !stepWait) {
	    alg.stop();
	    alg = new AlgThread(this);
	    alg.start();
	} else if (alg.isAlive() && stepWait) {
	    //alg.resume();
	    step = !step;
	    stepWait = false;
	} else { // alg.isAlive() == false
	    alg = new AlgThread(this);
	    alg.start();
	}
    }

    /**
     * This method is invoked at the end of the animation or when
     * the <b>stop</b> button is pressed. It restores the buttons
     * status on the control panel.
     */
    public void finishAlg() {
	((ImageButton)stopItem).setDisable();
	((ImageButton)runItem).setEnable();
	((ImageButton)skipItem).setEnable();
	dataMenu.enable();
	((ImageButton)stepItem).setEnable(); step = false;
        alg.restoreDrawingPanel();
    }
    
    /**
     * This method is called when the <b>step</b> execution mode is used.
     * It is normally added to the line where the execution will wait
     * for the <b>step</b> button to be pressed.
     */
    public void waitStep() {
	if (step) {
	    setText(0, "Click NEXT STEP...");
	    ((ImageButton)stepItem).setEnable();
	    repaint();
	    step = false; stepWait = true;
	    while (!step) {
		try {
		    Thread.sleep(100);
		} catch (InterruptedException e) {}
	    }
	    if (!stepWait)
		step = false;
	}
    }

    /**
     * This method is called when the <b>skip</b> execution mode is used.
     * It is normally added to the line where the execution will wait
     * after the <b>skip</b> button to be pressed.
     */
    public void waitSkip() {
	alg.waitSkip();
    }

    /**
     * Sets the attribute which indicate if the <b>skip</b> execution
     * mode is current.
     */
    public void setSkip(boolean skip) {
	dpAfter.setSkip(skip);
    }
    
    /**
     * Sets the attribute which indicate if the <b>step</b> execution
     * mode is current.
     */
    public void setStep(boolean step) {
	//setText(2, "Stepping through the next line(s)...");
	this.step = step;
	((ImageButton)stepItem).setDisable();
	((ImageButton)runItem).setEnable();
	dataMenu.enable();
	if (step) {
	    ((ImageButton)stepItem).setDisable();
	    stepWait = true;
	} else 
	    stepWait = false;
    }

    /**
     * Returns the reference to the AlgThread which contains the details and
     * execution sequences of the algorithm.
     * @see AlgThread
     */
    public AlgThread getAlg() {
	return alg;
    }

    /**
     * Set the delay for highlighting text.
     */
    public void setDelay(int delay) {
	this.delay = delay;
    }

    /**
     * Get the delay for highlighting text.
     */
    public int getDelay() {
	return delay;
    }

    /**
     * Get the applet which contains a button to start up this window.
     * @return Returns the applet which contains the button to start up
     * 		this window.
     */
    public AlgAnimApp getApplet() {
	return parentApp;
    }

    /**
     * Returns an instance of the drawing panel which is cast to its super class
     * <code>Panel</code>.
     */
    public DrawingPanel getDrawingPanel() {
	return dpAfter;
    }

    public DrawingPanel getBeforeDp() {
	return dpBefore;
    }	



    /**
     * Sets the drawing panel which is cast to its super class
     * <code>Panel</code>. This instance is used to set the GridBagConstraint
     * of the layout manager.
     * @see DrawingPanel
     */
    public void setDrawingPanel(DrawingPanel panel) {
	this.dpAfter = panel;
    }

    /**
     * Returns an instance of the <code>TextFrame</code> used to set the layout
     * constraints and highlight certain lines of the source code.
     * @see TextFrame
     */
    public TextFrame getTextFrame() {
	return tf;
    }

    /**
     * Get the commentary panel that displays messages of any type.
     * @return Commentary panel, in which each text field within can be set to
     * display text string from this class.
     * @see ComPanel
     */
    public ComPanel getComPanel() {
	return cpanel;
    }

    /**
     * Get the index of selected choice from the 'Select' pull menu.
     * @return The choice of the data selected.
     */
    public int getDataChoice() {
	return dataSelected;
    }

    /**
     * Get the skip button from the control panel.
     * @return The skip button.
     */
    public Button getSkipItem() {
	return skipItem;
    }

    /**
     * Get the run button from the control panel.
     * @return The run button.
     */
    public Button getRunItem() {
	return runItem;
    }

    /**
     * Get the stop button from the control panel.
     * @return The stop button.
     */
    public Button getStopItem() {
	return stopItem;
    }

    /**
     * Obtain the status of the preferred animation style.
     * @return True is the animation is kept to a minimum for the animated
     * algorithm; false otherwise.
     */
    public boolean isNoAnim() {
	return noAnim;
    }

    /**
     * Get the menu item which specify if the animation is enabled.
     * @return The checkbox menu item to enable the Animation of the alg.
     */
    public CheckboxMenuItem getEnableAnim() {
	return enableAnim;
    }

    /**
     * Get the menu item which specify if the animation is disabled.
     * @return The checkbox menu item to disable the Animation of the alg.
     */
    public CheckboxMenuItem getDisableAnim() {
	return disableAnim;
    }
} // class AlgAnimApp