"The games of a people reveal a great deal about them.“
Marshall McLuhan
Sound in Action Script
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Controlling sound
Enhance animation and interactivity
Engaging more user’s senses
Establish the mood of the movie
Use narration to accompany the story
Give audible feedback to interactions
Flash supports .WAV, .MP3, .AIF
Sound class controls sound
Start
Stop
Adjust sound volume
Stereo effect
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Controlling sound
sound object
mySound=new Sound();
mySound.attachSound(“sound_name”);
mySound.start ( seconds offset, loops);
Seconds offset
number that determines how many seconds
into the sound it should begin playing
(from the beginning 0, or from a later point)
Loops
how many times sound will play
No parameters
Flash playes sound once from the start
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Controlling sound
mySound.start ( 0, 5);
Plays sound from the beginning 5 times
mySound = new Sound();
mySound.attachSound("guitar");
startButton_btn.onRelease = function()
{
mySound.start(0,5);
}
stopButton_btn.onRelease = function()
{
mySound.stop();
}
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Modifying sounds
Flash allows to attach many sounds to the same sound object
Start function will play the most current sound attached
Volume control
setVolume()
Racing game- control the volume of the car engine sound as the
cars pass by
Pan control - control of the output through the left or right speaker
setPan()
Pong game – control the left and right hit wall sounds from the
appropriate sides
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Modifying sounds
setVolume(percentage of the full volume from 0 to 100)
100- maximum volume
0- silence
setPan(number from -100 to 100)
-100 left speaker
100 right speaker
0
plays sound from both speakers equally
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Modifying sounds – 02soundobject_pan_volume.fla
Open 02soundobject_pan_volume.fla from the Pickup folder
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Modifying sounds – 02soundobject_pan_volume.fla
Drag the instances of the volume, left, right, both buttons
on the stage and name them:
volUp_btn
volDown_btn
leftSpeaker_btn
rightSpeaker_btn
bothSpeakers_btn
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Modifying sounds
volUp_btn.onRelease = function() {
mySound.setVolume(100);
}
volDown_btn.onRelease = function() {
mySound.setVolume(20);
}
leftSpeaker_btn.onRelease = function() {
mySound.setPan(-100);
}
rightSpeaker_btn.onRelease = function() {
mySound.setPan(100);
}
bothSpeakers_btn.onRelease = function() {
mySound.setPan(0);
}
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Modifying sounds independently 03modify2sounds.fla
Create separate sound objects with parameters that target specific
movie clips
Sound objects will be applied to different movie clips so that
setVolume () and setPan () could control the sounds separately
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Modifying sounds independently 03modify2sounds.fla
clip1= _root.createEmptyMovieClip("clip1", 1);
clip2 = _root.createEmptyMovieClip("clip2", 2);
mySound1 = new Sound(clip1);
mySound2 = new Sound(clip2);
mySound1.attachSound("music1");
mySound2.attachSound("music2");
start1Button_btn.onRelease = function() {
mySound1.start(0, 1);
}
start2Button_btn.onRelease = function() {
mySound2.start(0, 1);
}
leftButton_btn.onRelease = function() {
mySound1.setPan(-100);
}
rightButton_btn.onRelease = function() {
mySound2.setPan(100);
}AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago :
Spring 2009
Transforming sounds 04soundtransform.fla
More precise sound control
Switch left / right speakers and stereo / mono dynamically
setTransform ()
allows to set percentage of how much of the lefr /right channel
will play through left / right speakers
Properties of the sound transform object
ll % value -how much of the left input plays in the left speaker
lr % value -how much of the right input plays in the left speaker
rr % value -how much of the right input plays in the right speaker
rl % value -how much of the left input plays in the right speaker
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Transforming sounds 04soundtransform.fla
mySound = new Sound();
mySound.attachSound("conversation");
startButton_btn.onRelease = function()
{
mySound.start(0, 5);
}
transformButton_btn.onRelease = function()
{
mySoundTransform = new Object();
mySoundTransform.ll = 0;
mySoundTransform.lr = 100;
mySoundTransform.rl = 100;
mySoundTransform.rr = 0;
mySound.setTransform(mySoundTransform);
}
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Transforming sounds 04soundtransform.fla
When we click Transform button Flash creates a generic object with
properties (mySoundTrasnform.ll, mySoundTrasnform.lr, …)
to hold the sound transformation information.
This information then used by the setTransfrom ()
to change the distribution in the left and right speakers.
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Dynamic sound control 05dynamicsound.fla
Sets desired volume level or speaker control
draggable movie clip acting as a sliding controller
The position of the movie clip is correlated with volume parameter of
the setVolume ()
slider_mc movie clip
groove_mc movie clip
Groove_mc will limit the motion of the draggable slider_mc
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Dynamic sound control 05dynamicsound.fla
slider_mc.onPress = function()
{
this.startDrag(false,
_root.groove_mc._x,
_root.groove_mc._y - 100,
_root.groove_mc._x,
_root.groove_mc._y);
}
slider_mc.onRelease = function()
{
stopDrag();
}
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Dynamic sound control 05dynamicsound.fla
slider_mc.onPress = function()
{
this.startDrag(false,
_root.groove_mc._x,
_root.groove_mc._y - 100,
_root.groove_mc._x,
_root.groove_mc._y);
}
When user presses the slider_mc, startDrag () lets the user drag the
specified movie clip and limits the position of the clip according to
parameters
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Dynamic sound control 05dynamicsound.fla
.startDrag([lock, [left, top, right, bottom]])
Lock
A Boolean value specifying whether the draggable movie clip is
locked to the center of the mouse position ( true ), or locked to
the point where the user first clicked on the movie clip ( false )
left , top , right , bottom
Values relative to the coordinates of
the movie clip's parent that specify a
constraint rectangle for the movie clip.
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Dynamic sound control 05dynamicsound.fla
slider_mc.onRelease = function()
{
stopDrag();
}
stopDrag()
stops dragging
setVolume(100)
setVolume(0)
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Dynamic sound control 05dynamicsound.fla
setVolume(100)
setVolume(0)
Correlates the y position of the slider_mc with the setVolume()
globalToLocal()
converts the coordinates of the slider to
coordinates relative to the groove
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Dynamic sound control 05dynamicsound.fla
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Dynamic sound control 05dynamicsound.fla
slider_mc.onMouseMove = function()
{
myPoint = new Object();
myPoint.x = this._x;
myPoint.y = this._y;
_root.groove_mc.globalToLocal(myPoint);
}
The current x position of the slider is assigned to myPoint.x
onMouseMove
provides a good way to trigger volume
change based on the slider position
The global coordinates of myPoint are changed to local coordinates of
the groove movie clip
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Dynamic sound control 05dynamicsound.fla
Link slider position to volume setting
}
myMusic_sound.setVolume(-myPoint.y);
updateAfterEvent();
Groove movie clip is 100 pixels tall
Hence its local coordinates range from -100 to 0
To change this range to positive value negative sign(-) is
used
The result is a range from 100 at tope and 0 at bottom
That can be used as the setVolume parameter
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Dynamic sound control 05dynamicsound.fla
Create sound object and play button
myMusic_sound= new Sound();
myMusic_sound.attachSound("music");
startButton_btn.onRelease = function() {
myMusic_sound.start(0, 10);
}
Test the movie
When you drag the slider up and down it dynamically changes the
volume
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
External sounds 06externalsound.fla
Internal sounds (from the library) increase the .swf file size
loadSound () allows playing external sounds that can be kept outside
flash movie
Allows change the sound file easily
Smaller flash file size
mySound = new Sound();
mySound.loadSound("kennedy.mp3", true);
loadSound("kennedy.mp3", true);
Kennedy.mp3 name of the external sound file
True
streaming (true) or event (false) sound
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
External sounds 06externalsound.fla
Streaming sounds
start play as soon as enough data downloads
one stream per sound object
long passages of music
narration
Event sounds
must be downloaded completely before they
can play
require start() command to plav
short sounds
sound effects
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Sound properties 07soundproperty.fla
mySound = new Sound();
mySound.loadSound("kennedy.mp3", true);
_root.onEnterFrame = function()
{
image_mc._alpha = (mySound.position / mySound.duration) * 100;
image_mc._xscale = 50 + ((mySound.position / mySound.duration) * 50);
image_mc._yscale = 50 + ((mySound.position / mySound.duration) * 50);
}
Position
measures the numbers of milliseconds a sound has been
playing
Duration
total number of milliseconds in the sound
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Sound properties 07soundproperty.fla
Modifies the image according to the sound length
As the sound plays, the image slowly reveals itself
When the sound ends the image is completely revealed
_root.onEnterFrame = function()
{
image_mc._alpha = (mySound.position / mySound.duration) * 100;
image_mc._xscale = 50 + ((mySound.position / mySound.duration) * 50);
image_mc._yscale = 50 + ((mySound.position / mySound.duration) * 50);
}
(Position / duration) * 100
gives the percentage of sound
that has downloaded
Increases the alpha of the movie clip as the sound plays so that the movie
clip begins transparent and ends opaque
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009
Detect sound event 07soundproperty.fla
onSoundComplete()
detects the end of the sound
mySound.onSoundComplete = function()
{
image_mc.attachMovie("end", "ending_mc", 1);
}
When sound ends a movie clip “end” is attached to the image_mc movie
clip. The registration point of the attached movie clip was modified in
advance so that it appears in correct position.
AD 206 Intermediate CG : School of Art and Design : University of Illinois at Chicago : Spring 2009