So i had this idea while ago when @alexgrover published a script and dropped a nugget in between which replicates the result of strategy tester on chart as an indicator.
So it seemed fair to use one of his strategy to display the results.
This strategy tester can now be used in replay mode like an indicator and you can see what happen at a particular section...
You can use this script to backtest Heikin-Ashi bar color change strategy.
You have to apply this script to usual candles and not Heikin-Ashi!!!
Background color indicates HA bar color. On change you'll see green/red arrows and alert will be fired.
Also you can find in the code calculations of all HA OHLC values.