Price crossing a line

[kiss987]

Hello

Is there a way to know if the current price crossed a line which was drawn by gui or from Draw.Line?

Thanks

[NinjaTrader_PaulH]

Hello kiss987,

Thanks for your post.

Yes, you would need to loop through a collection of draw objects and determine which line(s) you wanted to check the price against, obtain the anchor prices of the line and compare price to the anchor price.

Please see this section of the helpguide for sorting through a draw objects collection: https://ninjatrader.com/support/help...rawobjects.htm

[kiss987]

Assuming the object named "draw" of type DrawingTools.Line is my line, how do I know its value at barsAgo = 0 (current time)?

Thanks

[NinjaTrader_PaulH]

Hello kiss987,

Thanks for your reply.

If the line is a horizontal line type then you would only need the start anchor price as the price level does not change for the length of the line

If the line is a line (which can be of any length and any direction) then you would need to obtain the Start anchor price and bar and the end anchor price and bar, then extend mathematically a projection of the line to the current bar to then calculate the lines price at that bar.

[kiss987]

Hello

How can I extend mathematically a projection of the line (which can be of any length and any direction) to the current bar to then calculate the lines price at that bar?

Thank you

[NinjaTrader_PaulH]

Hello kiss987,

Thanks for your reply.

You would determine the slope of the line based on the start and end anchor bars and the start and end anchor prices and then use the slope to project what the Y value would be at X location.

I've attached an example script that draws a ray (for visual purposes) then calculates its slope and projects where the Y value would be for each subsequent bar by plotting a dot on the ray.

YAxisProjectionOfLine.zip

[RubenCazorla]

sorry this was not going here

[NinjaTrader_PaulH]

Hello RubenCazorla,

Thanks for your post.

You can use my example indicator in Post#6 to understand how you can obtain the bar-to-bar values of the drawn line.

[Amedeus]

Hi Paul,

Thank you very much, the projection is SO brilliant.

When trying to understand this sample and adapting it to a Swing ray, I've come to find that it would have been even more explicit and simple to understand by modifying line 74.
Would you agree that the int denominator can be replaced by the substraction of the previously declared variables ?

[NinjaTrader_PaulH]

Hello Amedeus,

Thanks for your post.

I agree.