Using onrender

[r3n3v]

I'm using the following code succefully,

 // restricting this loop to only the ChartBars.From/ToIndex limits the loop to only what is visible on the chart
for (int barIndex = ChartBars.FromIndex; barIndex <= ChartBars.ToIndex; barIndex++)
{

However when I adjust the chart horizontally to see more of the screen I notice that the Squares are are being painted on the onrender section are duplicated to the new "Visible" portion on the left.

What would be causing this?

[NinjaTrader_Kate]

Hello r3n3v,

Thank you for your reply.

Could you provide a screenshot illustrating what you mean by the squares being duplicated to the newly visible portion of the chart? We would expect that moving the chart would cause OnRender to be triggered and redraw objects on the newly visible bars.

Thanks in advance; I look forward to assisting you further.

[r3n3v]

I've attached an example.

[NinjaTrader_Kate]

Hello r3n3v,

Thank you for your reply.

I've conferred with my team and we're not entirely sure we understand. I would like to confirm some basics:

The indexes in the FromIndex > ToIndex loop would be used with ChartControl.GetXByBarIndex to get X coordinates for what we actually want to give to RenderTarget.Draw to draw items on the chart (for only what is visible)

FromIndex is always the left visible bar and ToIndex is the right most visible bar. Moving the chart will cause these values to change and OnRender to be triggered, which would recalculate over all bars currently in view..

https://ninjatrader.com/support/helpGuides/nt8/getxbybarindex.htm

Can you confirm that's what you're doing, and clarify and provide a simple example that shows exactly what you are inquiring on if this does not resolve the issue?

Thanks in advance; I look forward to assisting you further.

[r3n3v]

Thanks for your input.. Let me review my code...