/*------------------------------------------------------------------------* * Originally implemented by Scott Flinn, in association with the * Imager Graphics Laboratory at the University of British Columbia * (scottflinn@alumni.uwaterloo.ca). * * This source code may be freely distributed and modified for any purpose * as long as these introductory comments are not removed. Please be * aware that this represents the author's initial experiments with the * Java platform and should not necessarily be considered good examples * of Java programming. *------------------------------------------------------------------------*/ /*------------------------------------------------------------------------* * The TT class implements the Tritone Paradox demonstration. It is * meant to be run in a separate window using AppletStarter. *------------------------------------------------------------------------*/ import java.applet.*; import java.awt.*; import java.net.URL; /*------------------------------ Class TT ------------------------------*/ public class TT extends WindowApplet { private TTPanel canvas; private TTControls controls; private Button dismiss; public AudioClip[] TTone110 = null; // 110 Hz base tone pair public AudioClip[] TTone160 = null; // 160 Hz base tone pair /*----------------------- constructor ------------------------*/ TT() { GridBagLayout gridbag; GridBagConstraints c; // Create the layout manager and a constraint object gridbag = new GridBagLayout(); c = new GridBagConstraints(); setLayout( gridbag ); // Create the canvas panel and put it on top canvas = new TTPanel( this ); c.gridwidth = GridBagConstraints.REMAINDER; c.fill = GridBagConstraints.BOTH; c.weightx = 1.0; c.weighty = 1.0; gridbag.setConstraints( canvas, c ); add( canvas ); // Create the control panel and put it second from the bottom controls = new TTControls( canvas ); c.fill = GridBagConstraints.HORIZONTAL; c.weighty = 0.0; gridbag.setConstraints( controls, c ); add( controls ); // Create the dismiss button and put it at the bottom dismiss = new Button( "Dismiss" ); gridbag.setConstraints( dismiss, c ); add( dismiss ); validate(); } /*--------------------------- init ---------------------------*/ public void init( AppletStarter applet ) { URL urlBase; String toneName, loading = "Loading audio clip "; Graphics g; int i, n; // record id of AppletStarter instance that launched us this.applet = applet; // load audio clips urlBase = applet.getCodeBase(); n = 1; // number of clips loaded in total TTone110 = new AudioClip[2]; applet.setLabel( loading + "1 of 4 ..." ); TTone110[0] = applet.getAudioClip( urlBase, "tt/a110.au" ); applet.setLabel( loading + "2 of 4 ..." ); TTone110[1] = applet.getAudioClip( urlBase, "tt/b110.au" ); TTone160 = new AudioClip[2]; applet.setLabel( loading + "3 of 4 ..." ); TTone160[0] = applet.getAudioClip( urlBase, "tt/a160.au" ); applet.setLabel( loading + "4 of 4 ..." ); TTone160[1] = applet.getAudioClip( urlBase, "tt/b160.au" ); // let AppletStarter know that we're ready to go applet.appletLoaded(); } /*-------------------------- action --------------------------*/ public boolean action( Event event, Object obj ) { if ( event.target == dismiss ) { canvas.stopAnimation(); controls.enableStart(); hide(); return true; } return false; } } /*--------------------------- Class TTPanel ----------------------------*/ class TTPanel extends Panel implements Runnable { // Public constants public final int minPeriod = 150; // Milliseconds public final int maxPeriod = 1500; // Milliseconds // Public parameters public int period = 960; // Milliseconds public boolean goingUp = true; // Audio tone set from applet AudioClip[] TTone = null; // Current tone number, # of components, and current tone display switch private int tone = 1; private int toneSet = 0; // 0 -> 110 Hzbase; 1 -> 160 Hz base public boolean display = false; // Animation thread and applet id private Thread animator = null; private TT toneWindow; // ToneView object for current tone private ToneView currentTone; /*----------------------- constructor ------------------------*/ TTPanel( TT toneWindow ) { // Record original applet id this.toneWindow = toneWindow; // Create ToneView's and add with a grid layout setLayout( new GridLayout( 1, 1 ) ); currentTone = new ToneView( 2, 6, -1 ); add( currentTone ); } /*--------------------------- run ----------------------------*/ public void run() { long lastTime = System.currentTimeMillis(); long t; while ( true ) { t = ( lastTime + (long)period ) - System.currentTimeMillis(); if ( t > (long)1 ) try { animator.sleep( (int)t ); } catch ( InterruptedException e ) { System.out.println( "Interrupted exception in TTPanel.run" ); } lastTime = System.currentTimeMillis(); step(); } } /*--------------------------- step ---------------------------*/ public void step() { // Update frame number then draw current frame if necessary tone = ( tone + 1 ) % 2; if ( display ) { currentTone.setTone( tone ); currentTone.repaint(); } if ( TTone == null ) setToneSet( toneSet ); TTone[tone].play(); } /*---------------------- startAnimation ----------------------*/ public void startAnimation() { if ( animator == null ) { try { animator = new Thread( this ); animator.start(); } catch ( IllegalThreadStateException e ) { System.out.println( "Thread state exception in start" ); } } } /*---------------------- stopAnimation -----------------------*/ public void stopAnimation() { if ( animator != null ) { animator.stop(); animator = null; } } /*------------------------ setToneSet ------------------------*/ public void setToneSet( int toneSet ) { this.toneSet = toneSet; switch ( toneSet ) { case 0: TTone = toneWindow.TTone110; break; case 1: default: TTone = toneWindow.TTone160; break; } repaint(); } /*------------------------ setDisplay ------------------------*/ public void setDisplay( boolean display ) { // Toggle the display if necessary if ( this.display != display ) { if ( display ) currentTone.setTone( tone ); else currentTone.setTone( -1 ); currentTone.update( currentTone.getGraphics() ); } this.display = display; } } /*-------------------------- Class TTControls --------------------------*/ class TTControls extends Panel { Button start, stop, step; Checkbox display; Choice toneSet; Panel buttonPanel, toneSetPanel; Scrollbar speedSlider; Thread animator = null; TTPanel canvas; // The main drawing canvas /*----------------------- constructor ------------------------*/ TTControls( TTPanel canvas ) { GridBagLayout gridbag; GridBagConstraints c; CheckboxGroup cbg; // Record id of drawing canvas this.canvas = canvas; // Use a grid bag to lay things out gridbag = new GridBagLayout(); c = new GridBagConstraints(); setLayout( gridbag ); // Create slider speedSlider = new Scrollbar( Scrollbar.HORIZONTAL, canvas.maxPeriod + canvas.minPeriod - canvas.period, ( canvas.maxPeriod - canvas.minPeriod ) / 10, canvas.minPeriod, canvas.maxPeriod ); // Create panel with animation buttons buttonPanel = new Panel(); start = new Button( "Start" ); stop = new Button( "Stop" ); step = new Button( "Step" ); buttonPanel.add( start ); buttonPanel.add( stop ); buttonPanel.add( step ); // Create display check box display = new Checkbox( "Display" ); // Create tone set choice gadget toneSetPanel = new Panel(); toneSet = new Choice(); toneSet.addItem( "110 Hz" ); toneSet.addItem( "160 Hz" ); toneSet.select( 0 ); toneSetPanel.add( new Label( "Base frequency:" ) ); toneSetPanel.add( toneSet ); // Stop button is initially disabled stop.disable(); // First row: anim buttons -- speed label -- speed slider addControl( (Component)buttonPanel, 0.0, GridBagConstraints.NONE, 1, gridbag, c ); addControl( (Component)(new Label( "Speed:", Label.RIGHT )), 0.2, GridBagConstraints.NONE, 1, gridbag, c ); addControl( (Component)speedSlider, 0.8, GridBagConstraints.HORIZONTAL, GridBagConstraints.REMAINDER, gridbag, c ); // Second row: display -- components addControl( (Component)display, 0.0, GridBagConstraints.NONE, 1, gridbag, c ); addControl( (Component)toneSetPanel, 1.0, GridBagConstraints.HORIZONTAL, GridBagConstraints.REMAINDER, gridbag, c ); } /*------------------------ addControl ------------------------*/ private void addControl( Component component, double wx, int fill, int gw, GridBagLayout gb, GridBagConstraints c ) { c.weightx = (float)wx; c.weighty = 1.0; c.fill = fill; c.gridwidth = gw; gb.setConstraints( component, c ); add( component ); } /*-------------------------- insets --------------------------*/ public Insets insets() { return( new Insets( 5, 5, 5, 5 ) ); } /*----------------------- enableStart ------------------------*/ public void enableStart() { start.enable(); stop.disable(); step.enable(); } /*------------------------ enableStop ------------------------*/ public void enableStop() { start.disable(); stop.enable(); step.disable(); } /*-------------------------- action --------------------------*/ public boolean action( Event event, Object obj ) { if ( event.target == start ) { canvas.startAnimation(); enableStop(); return true; } if ( event.target == stop ) { canvas.stopAnimation(); enableStart(); return true; } if ( event.target == step ) { canvas.step(); return true; } if ( event.target == toneSet ) { canvas.setToneSet( toneSet.getSelectedIndex() ); return true; } if ( event.target == display ) { canvas.setDisplay( display.getState() ); return true; } return false; } /*----------------------- handleEvent ------------------------*/ public boolean handleEvent( Event event ) { if ( event.target == speedSlider ) { // simply adjust animation speed canvas.period = canvas.maxPeriod + canvas.minPeriod - speedSlider.getValue(); return true; } else return super.handleEvent( event ); } } /*------------------------------------------------------------------------*/