class Tc

def initialize(type="K",rtmp=0)
text=open("tc%s.dat"%(type.downcase)){|f| f.read}
@tv=text.split(/\n/).collect{|l| l.split(/\s*,\s*/).collect{|t| t.to_f}}
@tv.shift
@rt=rtmp
@rv=0
room()
end

def room(deg=@rt)
  @rt=deg
  @rv=volt(@rt)
end

def temp(vlt)
  vlt=(vlt+@rv)*1000
  for i in 0...@tv.size
    break if @tv[i][1]>=vlt
  end
  i=1 if i==0
  bv=@tv[i-1][1]
  av=@tv[i][1]
  bt=@tv[i-1][0]
  at=@tv[i][0]
  t=bt+(at-bt)*(vlt-bv)/(av-bv)
  return t
end

def volt(tmp)
  for i in 0...@tv.size
    break if @tv[i][0]>=tmp
  end
  i=1 if i==0
  bv=@tv[i-1][1]
  av=@tv[i][1]
  bt=@tv[i-1][0]
  at=@tv[i][0]
  v=bv+(av-bv)*(tmp-bt)/(at-bt)
  return v/1000-@rv
end

end #class