Programmatic way to get number of bars and max and min prices shown in chart

[AnotherTrader]

I would like a custom strategy to be able to determine programmatically the maximum and minimum prices being shown on a chart.

The number of bars shown on the chart is not in the strategy's control, but I'd like the strategy to be able to determine the maximum and minimum prices for however many bars are shown. I don't care about the maximum or minimum prices of any bars off the left or right edges of the chart. I only care about the bars actually visible. Obviously, this maximum or minimum would change if the chart is scrolled left or right.

Does that make sense?

Any suggestions as to how this can be done?

Thanks.

[NinjaTrader_PaulH]

Hello AnotherTrader,

Thanks for your post.

To only work with the bars on the chart, you would need to use OnRender() and loop through the bars.
To loop you could access ChartBars.FromIndex and ChartBars.ToIndex, references:

https://ninjatrader.com/support/helpGuides/nt8/?chartbars_fromindex.htm

https://ninjatrader.com/support/helpGuides/nt8/?chartbars_toindex.htm

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

To get the high of bar use: https://ninjatrader.com/support/help...8/?gethigh.htm
To get the low of a bar use: https://ninjatrader.com/support/help...t8/?getlow.htm
These both show a looping example

[AnotherTrader]

Can I use say Draw.Line() in the usual way within OnRender()?

[AnotherTrader]

Hmmm ... I think I am sorting this out .... looking at SharpDX documentation.

[NinjaTrader_PaulH]

Hello AnotherTrader,

Thanks for your reply.

Technically yes, but definitely not recommended because of the unnecessary overhead and would be against what we recommend as best practices which in this case would be to use SharpDX for drawing.

To draw in OnRender(), take a look at the example "Sample custom render" which is well documented in code.

[AnotherTrader]

I am getting the index of the last bar using ChartBars.ToIndex.

However, if I use my mouse to scroll father right (i.e. into the future), ChartBars.ToIndex doesn't seem to change. I need this to re-render my images correctly.

How do I get the chart index of the new right-edge of the chart as I scroll further right?

[NinjaTrader_PaulH]

Hello AnotherTrader,

Thanks for your reply.

Are you trying to extend your line into the future and are looking for a coordinate? (ChatPanel.X + ChartPanel.W?)

To answer your question you could use: int painted = chartControl.LastSlotPainted; Reference: https://ninjatrader.com/support/help...lotpainted.htm