OnRender DashStyle

[Marty125]

Is this a correct way to change DashStyle in OnRender?

private Stroke myStroke;

if (State == State.SetDefaults)
{
     myStroke = new Stroke(Brushes.Blue, my_DashStyleHelper, 1);
}



protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
{
   Dash_Stroke.RenderTarget = RenderTarget;
   RenderTarget.DrawLine(startPoint , endPoint, my_BrushDx, 5, myStroke.StrokeStyle);​
}


public override void OnRenderTargetChanged()
{
   if (my_BrushDx!= null) { my_BrushDx.Dispose(); }

   if (RenderTarget != null)
   {
      try
      {
         my_BrushDx = my_Brush.ToDxBrush(RenderTarget);
      }
      catch (Exception e ) { }
}




[Display(Name = "my_DashStyleHelper")]
public DashStyleHelper my_DashStyleHelper { get; set; }

[NinjaTrader_ChelseaB]

Hello Marty125,

That could looks like it would work fine, as it's using the <Stroke>.StrokeStyle as the StrokeStyle parameter.
Are you finding this is not working as expected?

You could specify a new SharpDX.Direct2D1.StrokeStyle object.

https://forum.ninjatrader.com/forum/ninjatrader-8/add-on-development/1312753-the-type-or-namespace-name-strokestyle-could-not-be-found

RenderTarget.DrawLine(Vector2 point0, Vector2 point1, Brush brush, float strokeWidth, StrokeStyle strokeStyle)

https://developer.ninjatrader.com/docs/desktop/sharpdx_direct2d1_rendertarget_drawline

https://developer.ninjatrader.com/docs/desktop/sharpdx_direct2d1_strokestyle

[Marty125]

It works fine, I´m just making sure I´m not doing something in a bad way, because this is kinda sketchy for me - RenderTarget parametres are SharpDX type and Stroke the way I make it is NinjaTrader.Gui.Stroke type. Ok, thanks for clarifying.

[Marty125]

I am rendering multiple rectangles with RenderTarget.DrawRectangle() and I am experiencing worse performance when using StrokeStyle set to Dash, is it normal? That a few rectangle outlines with dash StrokeStyle are making BIG impact on performance? Or should I try to use SharpDX.Direct2D1.StrokeStyle instead? Thanks

[NinjaTrader_ChelseaB]

Hello Marty125,

Unfortunately, I wouldn't be an expert in how much time DirectX renders a dashed line on graphic hardware.

Are you finding this is slower than when using an instantiated SharpDX.Direct2D1.StrokeStyle saved to a variable?

I would imagine that a dashed line would require more calculations than a solid line.