ChartFibonacciExpansion

 using cAlgo.API;
 namespace cAlgo
 {
     // A sample indicator for showing how to use the Chart.DrawFibonacciExpansion method
     [Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
     public class FibonacciExpansionSample : Indicator
     {
         protected override void Initialize()
         {
             var period = Chart.LastVisibleBarIndex - Chart.FirstVisibleBarIndex;
             var fibonacciExpansion = Chart.DrawFibonacciExpansion("fibonacciExpansion", Chart.FirstVisibleBarIndex, Bars.LowPrices[Chart.FirstVisibleBarIndex], Chart.FirstVisibleBarIndex, Bars.LowPrices.Minimum(period), Chart.LastVisibleBarIndex, Bars.HighPrices.Maximum(period), Color.Red);
             fibonacciExpansion.IsInteractive = true;
         }
         public override void Calculate(int index)
         {
         }
     }
 }

 import clr
 clr.AddReference("cAlgo.API")
 from cAlgo.API import *
 class Test():
     def initialize(self):
         period = api.Chart.LastVisibleBarIndex - api.Chart.FirstVisibleBarIndex
         fibonacciExpansion = api.Chart.DrawFibonacciExpansion("fibonacciExpansion", api.Chart.FirstVisibleBarIndex, api.Bars.LowPrices[api.Chart.FirstVisibleBarIndex], api.Chart.FirstVisibleBarIndex, Functions.Minimum(api.Bars.LowPrices, period), api.Chart.LastVisibleBarIndex, Functions.Maximum(api.Bars.HighPrices, period), Color.Red)
         fibonacciExpansion.IsInteractive = True