Drawing objects have auto-scale,is there a built in method for onRender() auto-scale?

[forrestang]

I look through the docs best I could, but could not find such an option.

But that is the question, is there a way to auto-scale items drawn within onRender(), or would I have to write my own function to accomplish this?

Figured I'd ask before I reinvent the wheel.

[NinjaTrader_Jesse]

Hello forrestang,

OnRender does not account for scaling automatically so that is something you would have to add. When drawing you will be providing x/y and width/height generally so those values will need to be calculated by you if they need scaled. The drawing tools are good examples of how to do some of your own calculations based on the chart dynamics. You can explore the code for the existing tools to see how they are scaled in their OnRender.

I look forward to being of further assistance.

[forrestang]

I got the Y-scale auto-scale working a while back using OnCalculateMinMax().

Just out of curiosity, is there a way to control right-edged auto-scaling, without manipulating margins via code? I can't think of a better term.

I.e., imagine you drew a vertical line 30 bars to the right most bar(in onRender). That line would likely not be visible(depending on how one's margins were set).

Is there a way to x-scale, autoscale?

[NinjaTrader_Jesse]

Hello forrestang,

Thank you for the reply.

There is not a way to autoscale the x axis. The margins would likely be the best way to handle the situation you described if the line is a fixed length into the future. You would otherwise likely be looking at using custom keyboard events to manually scroll the chart when you draw your object as one possible solution. There is not an api to move the x axis or navigate the chart currently so using the existing keyboard commands is generally the suggested way.

I look forward to being of further assistance.

[forrestang]

Hello forrestang,

Thank you for the reply.

There is not a way to autoscale the x axis. The margins would likely be the best way to handle the situation you described if the line is a fixed length into the future. You would otherwise likely be looking at using custom keyboard events to manually scroll the chart when you draw your object as one possible solution. There is not an api to move the x axis or navigate the chart currently so using the existing keyboard commands is generally the suggested way.

I look forward to being of further assistance.

Thanks NT Jesse. Can you think of where a simple example of using a keyboard event exists?

[NinjaTrader_Jesse]

Hello forrestang,

Thank you for the reply.

There is a sample in the rollover indications indicator in the following link:

https://ninjatraderecosystem.com/user-app-share-download/rolloverindications-2/

I look forward to being of further assistance.


The NinjaTrader Ecosystem website is for educational and informational purposes only and should not be considered a solicitation to buy or sell a futures contract or make any other type of investment decision. The add-ons listed on this website are not to be considered a recommendation and it is the reader's responsibility to evaluate any product, service, or company. NinjaTrader Ecosystem LLC is not responsible for the accuracy or content of any product, service or company linked to on this website.

[forrestang]

If you can't think of where one is, don't' worry about it.

But do you know where an example of how to implement a left-click and drag operation may be, with the minimum amount of code necessary to accomplish this may be? I.e., looking for an example of how to programmatically drag the chart left or right?

I would imagine this could either be accomplished with either a left-click and drag... OR... a left or right arrow key operation?

[NinjaTrader_Jesse]

Hello forrestang,

I provided a sample in post #6, you need to follow the link I added in that post to get to that sample.

Using keyboard events is not something NinjaScript has, you can use WPF keyboard event handling like that indicator shows. The sample demonstrates locating a control, using focus to make sure the control is in focus and then sending keys to that control.

Left click or mouse events would not as easily be used, the chart has many existing mouse event handlers which you could break by trying to implement new actions with the mouse. If you want to experiment with that you could research how to handle WPF mouse events and then target a specific control like the ChartControl. The PreviewMouse events could be used to handle existing events as they occur.


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