com.xuggle.mediatool.demos
Class MovingBalls

java.lang.Object
  com.xuggle.mediatool.demos.MovingBalls

All Implemented Interfaces:

Balls

public class MovingBalls
extends Object
implements Balls

An implementation of Balls that moves the balls around in a rectangle, and plays a sound for each ball that changes when it hits a wall.

Constructor Summary

MovingBalls(int ballCount, int width, int height, int sampleCount)
Grow a set of balls.

Method Summary

static double	addSignal(int frequency, int sampleRate, double volume, double progress, short[] samples) Add a signal of a given frequency to a set of audio samples.
short[]	getAudioFrame(int sampleRate) Get the next set of audio for the balls.
BufferedImage	getVideoFrame(long elapsedTime) Get a picture of a set of balls.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MovingBalls

public MovingBalls(int ballCount,
                   int width,
                   int height,
                   int sampleCount)

Grow a set of balls.

Method Detail

getVideoFrame

public BufferedImage getVideoFrame(long elapsedTime)

Description copied from interface: Balls

Get a picture of a set of balls. Each new call should provide the right picture assuming elapsedTime, in MICROSECONDS, has passed.

Specified by:

getVideoFrame in interface Balls

Parameters:

elapsedTime - the time in MICROSECONDS which has elapsed since the last video frame

getAudioFrame

public short[] getAudioFrame(int sampleRate)

Description copied from interface: Balls

Get the next set of audio for the balls. Samples returned should assume they are contiguous to the last samples returned.

Specified by:

getAudioFrame in interface Balls

Parameters:

sampleRate - the number of samples in a second

addSignal

public static double addSignal(int frequency,
                               int sampleRate,
                               double volume,
                               double progress,
                               short[] samples)

Add a signal of a given frequency to a set of audio samples. If the total signal value exceeds the percision of the samples, the signal is clipped.

Parameters:

frequency - the frequency of the signal to add

sampleRate - the number samples in a second

volume - the amplitude of the signal

progress - the start position the signal, initally should be zero, it will be updated by addSignal and returned, pass the returned value into subsquent calls to addSignal

samples - the array to which the samples will be added

Returns:

the progress at the end of the sample period