SharpDX Ellipse Rendering and Radius

[johnok]

Hello,

I'm trying to Draw an Ellipse to the Chart with SharpDX(https://ninjatrader.com/fr/support/h...rawellipse.htm) but i does not understand how to use this documented fonction.

Can anyone help me ?

Thanks

[FatCanary]

Does this help:

myEllipse    = new SharpDX.Direct2D1.Ellipse(myCentrePoint.ToVector2(), 50, 50);
RenderTarget.DrawEllipse(myEllipse, brush, strokeWidth;

Sorry, I'm no expert.

[johnok]

Thanks for your answer,

How do you build your variable myCentrePoint ?

[FatCanary]

From:

Point myCentrePoint = StartAnchor.GetPoint(chartControl, chartPanel, chartScale);

I modified:

NinjaTrader.NinjaScript.DrawingTools.FibonacciLevels

This part of the code is in OnRender.

Unfortunately, I don't fully understand it, but I got what I needed - an ellipse.

[NinjaTrader_BrandonH]

Hello johnok,

Thank you for your post.

Please see the attached example script demonstrating how to use SharpDX to draw an ellipse using RenderTarget.DrawEllipse.

In the example script, we get the ChartPanel coordinates for our startpoint and endpoint. The startpoint and endpoint are used to calculate the center point that will be used for the ellipse. Once we have our center point we create a SharpDX Brush to use for our ellipse. After a SharpDX Brush is made, we calculate the X and Y radius which will be used to create our ellipse. Now that we have our center, x radius, and y radius, we create the ellipse. After the ellipse is created, we call RenderTarget.DrawEllipse() to draw the ellipse on the chart.

See the help guide documentation below for more information. Also, see the SampleCustomRender indicator that comes default with NinjaTrader for more examples of using SharpDX. To view SampleCustomRender, you would open a New > NinjaScript Editor window, open the Indicators folder, and select the SampleCustomRender file.

Using SharpDX for Custom Rendering — https://ninjatrader.com/support/help..._rendering.htm
ChartPanel — https://ninjatrader.com/support/help...chartpanel.htm
RenderTarget.DrawEllipse - https://ninjatrader.com/support/help...rawellipse.htm

Let us know if we may assist further.

[johnok]

Thank everyone, i'm able to draw an Ellipse and i will try to understand everything !

[Gerik]

Hello Brandon,
your example creates a second chart section. How can I avoid this?
Is it possible to draw the center of an ellipse on a specific date of the abscissa and a few points below the low of the current bar?
Kind regads
Gerik

[NinjaTrader_BrandonH]

Hello Gerik,

Thanks for your post.

The IsOverlay property determines if the script is placed on the price panel or in a separate panel on the chart window.

You could change the IsOverlay property to true in State.SetDefaults to have the ellipse object rendered on the price panel instead of in a separate panel.

See this help guide page for more information about IsOverlay: https://ninjatrader.com/support/help.../isoverlay.htm

You could consider using GetXByTime() to get the x coordinate of a specific date and time.

GetYByValue() could be used to get a y-pixel coordinate on the chart determined by a series value, such as the Low of a bar (Bars.GetLow()), represented on the chart scale.

You could try using these methods to calculate a center point for your ellipse.

The tips of this help guide page might help you to calculate where the middle of the ellipse needs to be and where you want it in relation to the x and y axis:

https://ninjatrader.com/support/helpGuides/nt8/index.html?using_sharpdx_for_custom_chart_rendering.htm#SharpDXVectorsAndChartingCoordinates

See the help guide documentation below for more information.

How to Custom Render an Ellipse with SharpDX: https://ninjatrader.com/support/help...LinesAndShapes
GetXByTime(): https://ninjatrader.com/support/help...getxbytime.htm
GetYByValue(): https://ninjatrader.com/support/help...etybyvalue.htm
Bars.GetLow(): https://ninjatrader.com/support/help...nt8/getlow.htm