Custome Node Color?

Grasshopper Developer
6

I created special attributes for the EndPoints component, but only overrode two palette styles (hence the central component capsule is still black). It will look like this (unselected and selected):

You’ll have to create new attributes that derive from GH_ComponentAttributes, assign those attributes by overriding CreateAttributes() on your component and then hijack the Render method:

  public class Attributes_EndPoints : Grasshopper.Kernel.Attributes.GH_ComponentAttributes
  {
	public Attributes_EndPoints(IGH_Component component) : base(component) { }

	protected override void Render(GH_Canvas canvas, Graphics graphics, GH_CanvasChannel channel)
	{
	  Grasshopper.GUI.Canvas.GH_PaletteStyle styleStandard = null;
	  Grasshopper.GUI.Canvas.GH_PaletteStyle styleSelected = null;

	  if (channel == GH_CanvasChannel.Objects)
	  {
		// Cache the current styles.
		styleStandard = GH_Skin.palette_normal_standard;
		styleSelected = GH_Skin.palette_normal_selected;
		GH_Skin.palette_normal_standard = new GH_PaletteStyle(Color.HotPink, Color.Maroon, Color.DarkRed);
		GH_Skin.palette_normal_selected = new GH_PaletteStyle(Color.SkyBlue, Color.DarkBlue, Color.Black);
	  }

	  // Allow the base class to render itself.
	  base.Render(canvas, graphics, channel);

	  if (channel == GH_CanvasChannel.Objects)
	  {
		// Restore the cached styles.
		GH_Skin.palette_normal_standard = styleStandard;
		GH_Skin.palette_normal_selected = styleSelected;
	  }
	}
  }
  public class Component_EndPoints : GH_Component
  {
	public Component_EndPoints()
	  : base("End Points", "End", "Extract the end points of a curve.", "Curve", "Analysis") { }

	public override void CreateAttributes()
	{
	  base.m_attributes = new Attributes_EndPoints(this);
	}

	protected override void RegisterInputParams(GH_Component.GH_InputParamManager pManager)
	{
	  pManager.AddCurveParameter("Curve", "C", "Curve to evaluate", GH_ParamAccess.item);
	}
	protected override void RegisterOutputParams(GH_Component.GH_OutputParamManager pManager)
	{
	  pManager.AddPointParameter("Start", "S", "Curve start point", GH_ParamAccess.item);
	  pManager.AddPointParameter("End", "E", "Curve end point", GH_ParamAccess.item);
	}

	protected override void SolveInstance(IGH_DataAccess DA)
	{
	  Curve crv = null;
	  if (!DA.GetData(0, ref crv)) { return; }

	  DA.SetData(0, crv.PointAtStart);
	  DA.SetData(1, crv.PointAtEnd);
	}

	public override GH_Exposure Exposure
	{
	  get { return GH_Exposure.primary; }
	}
	public override Guid ComponentGuid
	{
	  get { return new System.Guid("{11BBD48B-BB0A-4f1b-8167-FA297590390D}"); }
	}
	protected override System.Drawing.Bitmap Icon
	{
	  get
	  {
		return CurveComponents.Properties.Resources.CurveEnds_24x24;
	  }
	}
  }

For the above to work you’ll need to import the Grasshopper.GUI.Canvas and System.Drawing namespaces.

–
David Rutten
david@mcneel.com

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