onrender questions

[ballboy11]

what is onrender used for, when is it triggered. is it trigger on form load?

[NinjaTrader_Jim]

Hello ballboy11,

Thanks for opening the thread.

OnRender() is used for custom drawing on a chart. It is called every time something on a chart needs to get updated. ChartControl will run a timed event every 250ms in which it should check if it needs to update a chart. If you click and drag on a chart, the chart will constantly have to be updated, so OnRender() is called significantly more during those moments.

You can add a print to OnRender() in a simple indicator to observe the context in which is called.

For more information, please see the OnRender() and ForceRefresh() articles of the help guide.

OnRender() - https://ninjatrader.com/support/help.../?onrender.htm

ForceRefresh() - https://ninjatrader.com/support/help...rcerefresh.htm

Additional information on Custom Rendering can be found here: https://ninjatrader.com/support/help..._rendering.htm

Please let me know if I may be of further assistance.