AppletController.java

package jass.render;

/**
   Applet derived class intended to be subclassed to create applet with sliders and buttons.
   @author Kees van den Doel (kvdoel@cs.ubc.ca)
 */
public abstract class AppletController extends java.applet.Applet {

    /**
       Intended to be overridden by deriving class to set the number of sliders on the applet
       @param n number of sliders
    */
    protected abstract void setNSliders(); // {nsliders = 7; }

    /**
       Intended to be overridden by deriving class to set the number of buttons on the applet
       @param n number of buttons
    */
    protected abstract void setNButtons(); // {nbuttons = 2; }

    /** Initializes the applet  */
    public void init () {
        initComponents ();
    }

    protected static final double MAX_SLIDERVAL = 10000;
    protected static final int NSLIDERS = 30;
    protected static final int NBUTTONS = 4;
    protected double[] val; //initial slider values
    protected String[] names; //slider labels
    protected double[] min,max; //slider ranges
    protected int nsliders = NSLIDERS;
    protected int nbuttons = NBUTTONS;

    /** Set the slider values (do not call its handlers) */
    protected void setValues(double[] val,double[] min,double[] max,String[] names) {
        for(int i=0;i<val.length;i++) {
            this.names[i] = names[i];
            this.val[i] = val[i];
            this.min[i] = min[i];
            this.max[i] = max[i];
            int x = (int)(MAX_SLIDERVAL * (val[i]-min[i])/(max[i]-min[i]));
            jSlider[i].setValue(x);
            jTextPane[i].setText(names[i]+new Double(val[i]).toString());
        }
    }

    /** Init the slider variables */
    protected void initValues() {
        val = new double[nsliders];
        min = new double[nsliders];
        max = new double[nsliders];
        names = new String[nsliders];
        for(int i=0;i<nsliders;i++) {
            names[i] = "-    ";
            val[i]=.5111313131;
            min[i] = 0;
            max[i] = 1;
            
        }
    }


    /** Member class to handle slider events */
    class LabeledMouseMotionAdapter extends java.awt.event.MouseMotionAdapter {
        private int label;
        
        public LabeledMouseMotionAdapter(int label) {
            super();
            this.label = label;
        }
        
        public void mouseDragged (java.awt.event.MouseEvent evt) {
            jSliderMouseDragged (label,evt);
        }
    }
    
    /** Member class to handle button events */
    class LabeledMouseAdapter extends java.awt.event.MouseAdapter {
        private int label;
        
        public LabeledMouseAdapter(int label) {
            super();
            this.label = label;
        }
        public void mousePressed (java.awt.event.MouseEvent evt) {
            jButtonMousePressed (label,evt);
        }
    }


    /** This method is called from within the init() method to
     * initialize the form.
     */
    protected void initComponents () {
        setNSliders();
        setNButtons();
        jSlider = new javax.swing.JSlider[nsliders];
        jTextPane = new javax.swing.JTextPane[nsliders];
        jButton = new javax.swing.JButton[nbuttons];

        for(int i=0;i<nsliders;i++) {
            jSlider[i] = new javax.swing.JSlider();
            jTextPane[i] = new javax.swing.JTextPane();
        }
        for(int i=0;i<nbuttons;i++) {
            jButton[i] = new javax.swing.JButton ();
        }

        setLayout (new java.awt.GridLayout (nsliders+(1+nbuttons)/2, 2));

        for(int i=0;i<nsliders;i++) {
            jSlider[i].setMaximum ((int)MAX_SLIDERVAL);
            add (jSlider[i]);
            jTextPane[i].setEditable (false);
            jTextPane[i].setText ("");
            add (jTextPane[i]);
        }

        
        for(int i=0;i<nsliders;i++) {
            jSlider[i].addMouseMotionListener (new LabeledMouseMotionAdapter(i));
        }

        for(int i=0;i<nbuttons;i++) {
            jButton[i].addMouseListener (new LabeledMouseAdapter(i));
            add (jButton[i]);
        }

        initValues();
        setValues(val,min,max,names);

    }

    /** User should verride slider handler */
    protected void onSlider(int k) {;}

    /** User should verride button handler */
    protected void onButton(int k) {;}


    protected void jButtonMousePressed (int k, java.awt.event.MouseEvent evt) {
        onButton(k);
    }

    /** Get slider values, scale, and call onSlider()
     */
    protected void jSliderMouseDragged (int k,java.awt.event.MouseEvent evt) {
        double sval = jSlider[k].getValue()/MAX_SLIDERVAL;
        val[k] = (float)(sval*(max[k]-min[k])+min[k]);
        jTextPane[k].setText(names[k] + new Double(val[k]).toString());
        onSlider(k);
    }
    
    protected javax.swing.JSlider[] jSlider;
    protected javax.swing.JTextPane[] jTextPane;
    protected javax.swing.JButton[] jButton;

}