我正在阅读java3d和其他java库，并发现许多类以某种方式命名，你可以假设它们已经习惯了声音，但是我还没有找到任何关于它的教程和我尝试过的每个实验失败了。如何使用这些类？
javax.media.j3d.AudioDevice; javax.media.j3d.Sound; 等等。
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.audioengines.javasound.JavaSoundMixer;
import com.sun.j3d.utils.behaviors.keyboard.KeyNavigatorBehavior;
import com.sun.j3d.utils.geometry.Box;
public class JavaSound extends Frame implements ActionListener
{
protected Canvas3D myCanvas3D = new Canvas3D(null);
/** The exit button to quit the application */
protected Button exitButton = new Button("Exit");
/** The button to switch on and off the first sound */
protected Button sound1Button = new Button("Sound 1");
/** The button to switch on and off the second sound */
protected Button sound2Button = new Button("Sound 2");
protected BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 10000.0);
// Create the two point sounds
PointSound sound1 = new PointSound();
PointSound sound2 = new PointSound();
/**
* Build the view branch of the scene graph. In this case a key navigation
* utility object is created and associated with the view transform so that
* the view can be changed via the keyboard.
* @return BranchGroup that is the root of the view branch
*/
protected BranchGroup buildViewBranch(Canvas3D c)
{
BranchGroup viewBranch = new BranchGroup();
Transform3D viewXfm = new Transform3D();
viewXfm.set(new Vector3f(0.0f, 0.0f, 30.0f));
TransformGroup viewXfmGroup = new TransformGroup(viewXfm);
viewXfmGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
viewXfmGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
ViewPlatform myViewPlatform = new ViewPlatform();
BoundingSphere movingBounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
BoundingLeaf boundLeaf = new BoundingLeaf(movingBounds);
PhysicalBody myBody = new PhysicalBody();
PhysicalEnvironment myEnvironment = new PhysicalEnvironment();
viewXfmGroup.addChild(myViewPlatform);
viewBranch.addChild(viewXfmGroup);
View myView = new View();
myView.addCanvas3D(c);
myView.attachViewPlatform(myViewPlatform);
myView.setPhysicalBody(myBody);
myView.setPhysicalEnvironment(myEnvironment);
KeyNavigatorBehavior keyNav = new KeyNavigatorBehavior(viewXfmGroup);
keyNav.setSchedulingBounds(movingBounds);
viewBranch.addChild(keyNav);
// Create a sounds mixer to use our sounds with
// and initialise it
JavaSoundMixer myMixer = new JavaSoundMixer(myEnvironment);
myMixer.initialize();
return viewBranch;
}
protected void addLights(BranchGroup b)
{
Color3f ambLightColour = new Color3f(0.5f, 0.5f, 0.5f);
AmbientLight ambLight = new AmbientLight(ambLightColour);
ambLight.setInfluencingBounds(bounds);
Color3f dirLightColour = new Color3f(1.0f, 1.0f, 1.0f);
Vector3f dirLightDir = new Vector3f(-1.0f, -1.0f, -1.0f);
DirectionalLight dirLight = new DirectionalLight(dirLightColour, dirLightDir);
dirLight.setInfluencingBounds(bounds);
b.addChild(ambLight);
b.addChild(dirLight);
}
protected void addBackgroundSound(BranchGroup b, String soundFile)
{
// Create a media container to load the file
MediaContainer droneContainer = new MediaContainer(soundFile);
// Create the background sound from the media container
BackgroundSound drone = new BackgroundSound(droneContainer, 1.0f);
// Activate the sound
drone.setSchedulingBounds(bounds);
drone.setEnable(true);
// Set the sound to loop forever
drone.setLoop(BackgroundSound.INFINITE_LOOPS);
// Add it to the group
b.addChild(drone);
}
protected void addObjectSound(TransformGroup tg, PointSound sound, String soundFile, float edge)
{
// First we get the current transform so that we can
// position the sound in the same place
Transform3D objXfm = new Transform3D();
Vector3f objPosition = new Vector3f();
tg.getTransform(objXfm);
objXfm.get(objPosition);
// Create the media container to load the sound
MediaContainer soundContainer = new MediaContainer(soundFile);
// Use the loaded data in the sound
sound.setSoundData(soundContainer);
sound.setInitialGain(1.0f);
// Set the position to that of the given transform
sound.setPosition(new Point3f(objPosition));
// Allow use to switch the sound on and off
sound.setCapability(PointSound.ALLOW_ENABLE_READ);
sound.setCapability(PointSound.ALLOW_ENABLE_WRITE);
sound.setSchedulingBounds(bounds);
// Set it off to start with
sound.setEnable(false);
// Set it to loop forever
sound.setLoop(BackgroundSound.INFINITE_LOOPS);
// Use the edge value to set to extent of the sound
Point2f[] attenuation = { new Point2f(0.0f, 1.0f), new Point2f(edge, 0.1f) };
sound.setDistanceGain(attenuation);
// Add the sound to the transform group
tg.addChild(sound);
}
protected BranchGroup buildContentBranch()
{
// Create the appearance
Appearance app = new Appearance();
Color3f ambientColour = new Color3f(1.0f, 0.0f, 0.0f);
Color3f emissiveColour = new Color3f(0.0f, 0.0f, 0.0f);
Color3f specularColour = new Color3f(1.0f, 1.0f, 1.0f);
Color3f diffuseColour = new Color3f(1.0f, 0.0f, 0.0f);
float shininess = 20.0f;
app.setMaterial(new Material(ambientColour, emissiveColour, diffuseColour, specularColour, shininess));
// Make the cube
Box myCube = new Box(1.0f, 1.0f, 1.0f, app);
TransformGroup cubeGroup = new TransformGroup();
BranchGroup contentBranch = new BranchGroup();
addLights(contentBranch);
addObjectSound(cubeGroup, sound1, new String("C:\\Users\\Sawyera\\Desktop\\loop1.wav"), 10.0f);
addObjectSound(cubeGroup, sound2, new String("C:\\Users\\Sawyera\\Desktop\\loop2.wav"), 20.0f);
addBackgroundSound(contentBranch, new String("C:\\Users\\Sawyera\\Desktop\\loop3.wav"));
cubeGroup.addChild(myCube);
contentBranch.addChild(cubeGroup);
return contentBranch;
}
public void actionPerformed(ActionEvent e)
{
if (e.getSource() == exitButton)
{
dispose();
System.exit(0);
}
else if (e.getSource() == sound1Button)
{
if (sound1.getEnable())
sound1.setEnable(false);
else
sound1.setEnable(true);
}
else if (e.getSource() == sound2Button)
{
sound2.setEnable(!sound2.getEnable());
}
}
public JavaSound()
{
VirtualUniverse myUniverse = new VirtualUniverse();
Locale myLocale = new Locale(myUniverse);
// buildUniverse(myCanvas3D);
myLocale.addBranchGraph(buildContentBranch());
myLocale.addBranchGraph(buildViewBranch(myCanvas3D));
setTitle("SimpleSounds");
setSize(400, 400);
setLayout(new BorderLayout());
Panel bottom = new Panel();
bottom.add(sound1Button);
bottom.add(sound2Button);
bottom.add(exitButton);
add(BorderLayout.CENTER, myCanvas3D);
add(BorderLayout.SOUTH, bottom);
exitButton.addActionListener(this);
sound1Button.addActionListener(this);
sound2Button.addActionListener(this);
setVisible(true);
}
public static void main(String[] args)
{
JavaSound sw = new JavaSound();
}
}
答案 0 :(得分：3)
根据Javadoc：
“graphicsConfiguration - 将用于创建画布的有效GraphicsConfiguration对象。此对象不应为null ...”javax.media.j3d.Canvas3D
您将其初始化为null：
protected Canvas3D myCanvas3D = new Canvas3D(null);
以下是教程中使用的初始化：
GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
Canvas3D canvas3D = new Canvas3D(config);