Learn From TradingView
This really applies to your entire platform. Either let us get the graph data on tradingview and use an api to use there system to trade. Or learn there ways. They have already done all the heavy lifting and research just emaulate there features 1 by 1 and your system will attract 100x your current client base. Its so simple not sure how you guys don't see or understand this.
TV's renko and range bars are a disgrace. Otherwise, a much better platform for functionality, configuration and GUI.
cTrader could also just copy jForex as well.