Linear scaling script

scaler.coffee

class Scaler

  scale: (range, domain) =>
    @rmax = domain[1]
    @rmin = domain[0]
    return (val) =>
      position_in = @getPositionInDomain(val)
      position_out = @getPositionInRange(range, position_in)
      Math.ceil(position_out)
      
  getPositionInDomain: (val) =>
    abs_width = @rmax - @rmin
    abs_val = @rmax - val
    if abs_width == abs_val
      return 100
    else
      return 100 - (abs_val * 100 / abs_width)
    
  getPositionInRange: (range, pir) =>
    abs_width = range[1] - range[0]
    return range[0] + (abs_width * pir / 100)
    

    
scaler = new Scaler()
radius_range = @scaler.scale(
  [6, 16],  # range
  [12, 456])  # domain