pointsound.java

JAVA3D矩陈的相关类

/*
 * $RCSfile: PointSound.java,v $
 *
 * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
 *
 * Use is subject to license terms.
 *
 * $Revision: 1.5 $
 * $Date: 2007/02/09 17:18:16 $
 * $State: Exp $
 */

package javax.media.j3d;

import javax.vecmath.Point2f;
import javax.vecmath.Point3f;


/**
 * The PointSound node (a sub-class of the Sound node) defines a spatially 
 * located sound source whose waves radiate uniformly in all directions from 
 * a given location in space.  It has the same attributes as a Sound object
 * with the addition of a location and the specification of distance-based
 * gain attenuation for listener positions between an array of distances.
 *<P>
 * A sound's amplitude is attenuated based on the distance between the listener
 * and the sound source position. A piecewise linear curve (defined in terms of
 * pairs of distance and gain scale factor) specifies the gain scale factor slope.
 * 
 * The PointSound's location and attenuation distances are defined in the local
 * coordinate system of the node.
 *<P>
 *  Distance Gain Attenuation
 * <UL>
 * Associated with distances from the listener to the sound source via an
 * array of (distance, gain-scale-factor) pairs. The gain scale factor
 * applied to the sound source is the linear interpolated gain value between
 * the distance value range that includes the current distance from 
 * the listener to the sound source. If the distance from the listener to
 * the sound source is less than the first distance in the array, the first
 * gain scale factor is applied to the sound source. This creates a
 * spherical region around the listener within which all sound gain is
 * uniformly scaled by the first gain in the array.  If the distance from
 * the listener to the sound source is greater than the last distance in
 * the array, the last gain scale factor is applied to the sound source.
 *<P>
 * Distance elements in this array of Point2f is a monotonically-increasing
 * set of floating point numbers measured from the location of the sound
 * source. Gain scale factors elements in this list of pairs can be any
 * positive floating point numbers. While for most applications this list
 * of gain scale factors will usually be monotonically-decreasing, they
 * do not have to be.
 * If this 
 * is not set, no distance gain attenuation is performed (equivalent to 
 * using a distance gain of 1.0 for all distances). 
 *<P>
 * getDistanceGainLength method returns the length of the distance gain
 * attenuation arrays. Arrays passed into getDistanceGain methods should all
 * be at least this size.
 *<P>
 * There are two methods for getDistanceGain, one returning an array of
 * points, the other returning separate arrays for each attenuation 
 * component.</UL>
 */

public class PointSound extends Sound {
    // Constants
    //
    // These flags, when enabled using the setCapability method, allow an
    // application to invoke methods that respectively read and write the position
    // and the distance gain array. These capability flags are enforced only when
    // the node is part of a live or compiled scene graph

  /**
   * Specifies that this node allows access to its object's position
   * information.
   */
  public static final int
    ALLOW_POSITION_READ = CapabilityBits.POINT_SOUND_ALLOW_POSITION_READ;

  /**
   * Specifies that this node allows writing to its object's position
   * information.
   */
  public static final int
    ALLOW_POSITION_WRITE = CapabilityBits.POINT_SOUND_ALLOW_POSITION_WRITE;

  /**
   * Specifies that this node allows access to its object's distance
   * gain attenuation information.
   */
  public static final int
    ALLOW_DISTANCE_GAIN_READ = CapabilityBits.POINT_SOUND_ALLOW_DISTANCE_GAIN_READ;

  /**
   * Specifies that this node allows writing to its object's distance
   * gain attenuation information.
   */
  public static final int
    ALLOW_DISTANCE_GAIN_WRITE = CapabilityBits.POINT_SOUND_ALLOW_DISTANCE_GAIN_WRITE;


    // Array for setting default read capabilities
    private static final int[] readCapabilities = {
        ALLOW_POSITION_READ,
        ALLOW_DISTANCE_GAIN_READ
    };

    /**
     * Constructs and initializes a new PointSound node using default
     * parameters.  The following default values are used:
     * <ul>
     * position vector: (0.0, 0.0, 0.0)<br>
     * Back attenuation: null<br>
     * distance gain attenuation: null (no attenuation performed)<br>
     * </ul>
     */
    public PointSound() {
	// Uses default values defined for Sound and PointSound nodes
        super();
        // set default read capabilities
        setDefaultReadCapabilities(readCapabilities);

    }   

    /**
     * Constructs a PointSound node object using only the provided parameter
     * values for sound data, sample gain, and position. The remaining fields
     * are set to the above default values. This form uses a point as input for
     * its position.
     * @param soundData sound data associated with this sound source node
     * @param initialGain amplitude scale factor applied to sound source
     * @param position 3D location of source
     */  
    public PointSound(MediaContainer soundData,
                      float initialGain,
                      Point3f position) {
        super(soundData, initialGain);

        // set default read capabilities
        setDefaultReadCapabilities(readCapabilities);

        ((PointSoundRetained)this.retained).setPosition(position);
    }   

     /**
      * Constructs a PointSound node object using only the provided parameter
      * values for sound data, sample gain, and position. The remaining fields
      * are set to to the above default values. This form uses individual float
      * parameters for the elements of the position point.
      * @param soundData sound data associated with this sound source node
      * @param initialGain amplitude scale factor applied to sound source data
      * @param posX x coordinate of location of source
      * @param posY y coordinate of location of source
      * @param posZ z coordinate of location of source
      */  
     public PointSound(MediaContainer soundData,
                      float initialGain,
                      float posX, float posY, float posZ ) {
        super(soundData, initialGain);

        // set default read capabilities
        setDefaultReadCapabilities(readCapabilities);

        ((PointSoundRetained)this.retained).setPosition(posX,posY,posZ);
    }   

    // The next four constructors fill all this classes fields with the provided
    // arguments values.
    // See the header for the setDistanceGain method for details on how the
    // those  arrays are interpreted.

    /**
     * Construct a PointSound object accepting Point3f as input for the position
     * and accepting an array of Point2f for the distance attenuation values 
     * where each pair in the array contains a distance and a gain scale factor.
     * @param soundData sound data associated with this sound source node
     * @param initialGain amplitude scale factor applied to sound source
     * @param loopCount number of times loop is looped
     * @param release flag denoting playing sound data to end
     * @param continuous denotes that sound silently plays when disabled
     * @param enable sound switched on/off
     * @param region scheduling bounds
     * @param priority playback ranking value
     * @param position 3D location of source
     * @param distanceGain array of (distance,gain) pairs controling attenuation
     */  
    public PointSound(MediaContainer soundData,
                      float initialGain,
                      int loopCount,
                      boolean release,
                      boolean continuous,
                      boolean enable,
                      Bounds  region,
                      float   priority,
                      Point3f position, 
                      Point2f[] distanceGain) {

        super(soundData, initialGain, loopCount, release, continuous, 
                   enable, region, priority );

        // set default read capabilities
        setDefaultReadCapabilities(readCapabilities);

        ((PointSoundRetained)this.retained).setPosition(position);
        ((PointSoundRetained)this.retained).setDistanceGain(distanceGain);
    }   

    /**
     * Construct a PointSound object accepting individual float parameters for 
     * the elements of the position point, and accepting an array of Point2f for
     * the distance attenuation values where each pair in the array contains a 
     * distance and a gain scale factor. 
     * @param soundData sound data associated with this sound source node
     * @param initialGain amplitude scale factor applied to sound source
     * @param loopCount number of times loop is looped
     * @param release flag denoting playing sound to end
     * @param continuous denotes that sound silently plays when disabled
     * @param enable sound switched on/off
     * @param region scheduling bounds
     * @param priority playback ranking value
     * @param posX x coordinate of location of source
     * @param posY y coordinate of location of source
     * @param posZ z coordinate of location of source
     * @param distanceGain array of (distance,gain) pairs controling attenuation
     */  
    public PointSound(MediaContainer soundData,
                      float initialGain,
                      int loopCount,
                      boolean release,
                      boolean continuous,
                      boolean enable,
                      Bounds  region,
                      float   priority,
                      float posX, float posY, float posZ, 
                      Point2f[] distanceGain) {

        super(soundData, initialGain, loopCount, release,
              continuous, enable, region, priority );

        // set default read capabilities
        setDefaultReadCapabilities(readCapabilities);

        ((PointSoundRetained)this.retained).setPosition(posX,posY,posZ);
        ((PointSoundRetained)this.retained).setDistanceGain(distanceGain);
    }   

    /**
     * Construct a PointSound object accepting points as input for the position.
     * and accepting separate arrays for the distance and gain scale factors 
     * components of distance attenuation. 
     * @param soundData sound data associated with this sound source node
     * @param initialGain amplitude scale factor applied to sound source
     * @param loopCount number of times loop is looped
     * @param release flag denoting playing sound data to end
     * @param continuous denotes that sound silently plays when disabled
     * @param enable sound switched on/off
     * @param region scheduling bounds
     * @param priority playback ranking value
     * @param position 3D location of source
     * @param attenuationDistance array of distance values used for attenuation
     * @param attenuationGain array of gain scale factors used for attenuation
     */  
    public PointSound(MediaContainer soundData,
                      float initialGain,
                      int loopCount,
                      boolean release,
                      boolean continuous,
                      boolean enable,
                      Bounds  region,
                      float   priority,
                      Point3f position, 
                      float[] attenuationDistance,
                      float[] attenuationGain) {

        super(soundData, initialGain, loopCount, release, continuous, 
                enable, region, priority );

        // set default read capabilities
        setDefaultReadCapabilities(readCapabilities);

        ((PointSoundRetained)this.retained).setPosition(position);