interpolation.coffee

numBars = 73
bars = [0..numBars-1].map -> 0

getDisplayBars = (audioData)->
	deltaT = audioData.length/numBars
	bars[0] = audioData[0]
	for barNum in [1..numBars-1]
	  timeIndex = barNum*deltaT
	  leftIndex = Math.floor timeIndex
	  rightIndex = Math.ceil timeIndex
	  leftWeight = timeIndex%1
	  rightWeight = 1-leftWeight
	  leftValue = audioData[leftIndex]
	  rightValue = audioData[rightIndex]
	  bars[barNum] = leftValue*leftWeight + rightValue*rightWeight
	bars

# set audioData to an array of random values between -1 and 1
audioData = [0..99].map -> Math.random()*2-1

getDisplayBars audioData