Hello
I am trying to create a program that will generate a sine wave with the frequency and volume based off of the mouse X and Y. I also want it to display the waveform for the current frequency and volume. Here is an example picture: http://www.gemtree.com/SHOOT/sinusoid.gif

The problem I'm having is that the waveform is creating a bunch of lines and not getting rid of the old ones. It also is only creating angled lines and not curves.

Here is what I have so far:
Code:

import krister.Ess.*;

AudioStream myStream;
SineWave myWave;

int bufferSize;
int steps;
float limitDiff;
int numAverages=32;
float myDamp=.1f;
float maxLimit,minLimit;

FFT myFFT;

int bufferDuration;

void setup() {
  size(640,448);
  colorMode(RGB, 255);
  
  // start up Ess
  Ess.start(this);

  // create a new AudioStream
  myStream=new AudioStream();

  bufferSize=640;  
  // set up our FFT
  myFFT=new FFT(bufferSize*2);
  myFFT.equalizer(true);

  // set up our FFT normalization/dampening
  minLimit=.005;
  maxLimit=.05;
  myFFT.limits(minLimit,maxLimit);
  myFFT.damp(myDamp);
  myFFT.averages(numAverages);

  // get the number of bins per average 
  steps=bufferSize/numAverages;

  // get the distance of travel between minimum and maximum limits
  limitDiff=maxLimit-minLimit;

  // start
  myStream.start();
  
  background(0);
  
  bufferDuration=myStream.ms(bufferSize);  
}

void draw() {
  stroke(0,0,255);
  line(0,height/2,width,height/2);
  noStroke();
  drawSamples();
}

void audioStreamWrite(AudioStream theStream) {
  float volume = ((float)mouseY-height)/5;
  // our wave
  myWave=new SineWave((float)mouseX/100,volume);

  // next wave
  myWave.generate(myStream);
}

// we are done, clean up Ess

public void stop() {
  Ess.stop();
  super.stop();
}

void drawSamples() {
  stroke(0,255,0);

  // interpolate between 0 and writeSamplesSize over writeUpdateTime
  int interp=(int)max(0,(((millis()-myStream.bufferStartTime)/(float)bufferDuration)*bufferSize));

  for (int i=0;i<640;i++) {
    float left=height/2;
    float right=height/2;

    if (i+interp+1<myStream.buffer2.length) {
	left-=myStream.buffer2[i+interp]*75.0;
	right-=myStream.buffer2[i+1+interp]*75.0;
    }
    
    line(i,left,i+1,right);
  }
} 

Thank you John. That took care of the redraw problem, but the waveform is looking like it is scaled wrong. Here is a picture of it: http://img110.imageshack.us/img110/3203/waveformerrorxu7.jpg