Preview

Replies to This Discussion

Permalink Reply by David Rutten on August 30, 2012 at 11:17am

Hi Peter,

in a compiled component or in a VB/C# script component?

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by OwnWindow on August 30, 2012 at 12:31pm

Hi David,

I am working on compiled components.

Gr,

Peter

Permalink Reply by David Rutten on August 30, 2012 at 12:39pm

In that case you can set the preview of input/output parameters while registering them.For example, inside RegisterInputParameters:

Protected Overrides Sub RegisterInputParams(ByVal pManager As GH_Component.GH_InputParamManager)
  pManager.Register_CurveParam("Curve", "C", "Curve something or other")
  pManager.HideParameter(0)

End Sub

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by OwnWindow on August 30, 2012 at 1:18pm

Thx. I got it.

And what if I want a preview but no visible output parameter?

Gr,

Peter

Permalink Reply by David Rutten on August 30, 2012 at 1:49pm

If you want to draw preview geometry that is not stored inside an input or output parameter, then you need to override the preview methods in the component itself.

IsPreviewCapable should be overridden and always return True.

ClippingBox needs to be overridden and it should return the base class Box unioned with the boundingbox of your own geometry.

DrawViewportMeshes and/or DrawViewportWires need to be overridden and you can draw your custom stuff here. Be sure to call the base class methods otherwise you'll short-circuit the parameter preview.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by OwnWindow on September 2, 2012 at 8:23am

Hi David,

This will take a bit more then my current programming skills. But I will try anyway. Do you happen to have an example for this?

Gr,

Peter

Permalink Reply by Ángel Linares on September 2, 2012 at 8:44am

Finded (one of) the problem with my custom sprite component!!! Thanks!

ClippingBox needs to be overridden and it should return the base class Box unioned with the boundingbox of your own geometry.

Permalink Reply by OwnWindow on September 3, 2012 at 1:26pm

Hi David,

THX! I got it working for lines and text. How could I make it work for text dots? I would like to identify nodes in a list.

Gr,

Peter

Permalink Reply by OwnWindow on November 20, 2012 at 6:50am

Hi David,

Is this what you mean here? I am I trying to preview a list of curves stored in 'strips'. The curves do show in black when I have a output parameter for it and curves assigned to it. Otherwise the curves do not show. Maybe it's my clippingbox? I'm not sure how to union.

public override bool IsPreviewCapable
{
    get
    {

        return true;
    }
}

public override BoundingBox ClippingBox
{
    get
        {
            return base.ClippingBox;
        }
}

public override void DrawViewportWires(IGH_PreviewArgs args)
{
    base.DrawViewportWires(args);

    for (int i = 0; i < strips.Count; i++)
    {
        args.Display.DrawCurve(strips[i], Color.Black);
    }
}

Permalink Reply by OwnWindow on November 20, 2012 at 7:09am

I think I found it. I returned the bounding box of my curve in stead of base.Clippingbox. Now it works.

Permalink Reply by Florian Frank on September 5, 2012 at 1:40pm

Hi David, would it be possible also in a VB/C# script component? ;-)

Cheers

FF