Waveform Display
================================

A button can display a waveform

system call: newWavObject(owner)
creates if necessary: owner.wavObjs[]

wavObj = makeWavObject(owner, color) // sets wavColor
wavObj = makeWavObject(owner) // init color __wav.defaultColorTab[sizeof(owner.wavObjs)]
creates a waveform object which displays a waveform in the inset rectangle
the waveform is stored in circular buffer wavObj.wavBuf[]
wavObj.wavIndex points to the place in the buffer to put the next sample

owner.wavSize = defaultNumberOfSamples
wavObj.wavSize = numberOfSamples
if zero: ignore
if NULL: use owner's defaultNumberOfSamples
owner.wavSweep = 0;

wavObj.wavColor = color
owner.wavColor = color // same as owner.wavObjs[0].wavColor = color

wavAddSample(wavObj, value);
wavAddSample(owner, value); // same as wavAddSample(owner.wavObjs[0], value)
add a sample to the waveform object's buffer

You can set these:
wavObj.min // value corresponding to the bottom of the inset rectangle (default: -1)
wavObj.max // value corresponding to the top of the inset rectangle (default: 1)

wave object attributes
_NSID: pointer to PsiWave Objective C object
owner: the UIE (button, for example) to display the waveform in
index: index in owner's wavObjArray
wavArr: array of samples
wavIndex: we will put next sample into wavArr[wavIndex]

attributes set in owner
wavObjArray: array of waveform objects created by newWavObject