Filled Arc in SharpDX

[waldoalvarez]

Hi:

I was looking at the documentation of SharpDX and could not find how to create a filled arc. Let's say something like FillEllipse But with starting and ending angle. I see that NinjaTrader has an Arc drawing tool. Could be is using geometry sink. Anyways just asking around for hints to be able to make some pie chart.

Regards

[NinjaTrader_ChrisL]

Hello waldoalvarez, thanks for your post.

The FillGeometry method can be used in this case:

https://ninjatrader.com/support/help...llgeometry.htm

The Arc drawing tool also demonstrates how to do this. See the source code for the Arc drawing tool in the Drawing Tools folder of the NinjaScript Editor.

Best regards,
-ChrisL

[Bidder]

The basic idea. The DxBrush needs to be defined but the docs on that process are extensive

  Point sp = new Point(x,y);
  Point ep = new Point(x,y);
  double ArcRadius=8.1;
  RenderArcShape(sp, ep, ArcRadius);​


    private void RenderArcShape(Point sp, Point ep, double ar)
    {
        
        SharpDX.Direct2D1.AntialiasMode oldAntialiasMode = RenderTarget.AntialiasMode;
        RenderTarget.AntialiasMode = SharpDX.Direct2D1.AntialiasMode.PerPrimitive;
        
        SharpDX.Direct2D1.ArcSegment arcSegment = new SharpDX.Direct2D1.ArcSegment
        {
            ArcSize            = SharpDX.Direct2D1.ArcSize.Small,
            Point            = new SharpDX.Vector2((float) ep.X, (float) ep.Y),
            SweepDirection    = SharpDX.Direct2D1.SweepDirection.CounterClockwise,
            Size            = new SharpDX.Size2F((float)ar, (float)ar) //Arc radius
        };

        // Create the arc between the line two end points
        SharpDX.Direct2D1.PathGeometry arcGeometry = new SharpDX.Direct2D1.PathGeometry(Core.Globals.D2DFactory);
        SharpDX.Direct2D1.GeometrySink geometrySink = arcGeometry.Open();
        geometrySink.BeginFigure(new SharpDX.Vector2((float)sp.X, (float)sp.Y), SharpDX.Direct2D1.FigureBegin.Filled);
        geometrySink.AddArc(arcSegment);
        geometrySink.EndFigure(SharpDX.Direct2D1.FigureEnd.Open);
        geometrySink.Close();
        RenderTarget.FillGeometry(arcGeometry, DxBrush);

        arcGeometry.Dispose();
        geometrySink.Dispose();
        
        RenderTarget.AntialiasMode = oldAntialiasMode;
    }
​

[NinjaTrader_Gaby]

Hello Bidder,

Do you have a question about this code or are you just sharing?

[Bidder]

Didn't see a lot of info on arc segments on the forum so just sharing some code that works