在grasshopper里DrawViewportWires更改预览后，禁用电池仍然显示

Question

请问，我使用DrawViewportWires 之后，就算禁用了该电池，预览样式仍然在rhino空间可见，怎么办呀

  private void RunScript(List<Curve> crvs, System.Drawing.Color color, int thickness, ref object A)
  {


    cc = crvs;
    co = color;
    thic = thickness;

  }

  // <Custom additional code> 

  List<Curve> cc;
  Color co;
  int thic;

  //Return a BoundingBox that contains all the geometry you are about to draw.
  public override BoundingBox ClippingBox
  {
    get
    {
      return BoundingBox.Empty;
    }
  }

  //Draw all meshes in this method.


  //Draw all wires and points in this method.
  public override void DrawViewportWires(IGH_PreviewArgs args)
  {
    foreach(Curve curve in cc) { args.Display.DrawCurve(curve, co, thic); }

  }

在c# script里

Answer 1

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在您的C# Script中，您已经正确实现了DrawViewportWires方法来绘制曲线，但遇到的问题是即使禁用了该电池，预览样式仍然在Rhino空间中可见。为了解决这个问题，您需要确保在电池禁用时，DrawViewportWires方法不再进行任何绘制操作。以下是修改后的代码实现，以及对相关问题的详细解答：

修改后的代码：

using Grasshopper.Kernel;

public class MyComponent : GH_Component
{
    private List<Curve> cc;
    private Color co;
    private int thic;

    public MyComponent()
      : base("MyComponent", "MyComp", "Description of your component", "Category", "Subcategory")
    {
    }

    protected override void RegisterInputParams(GH_InputParamManager pManager)
    {
        pManager.AddCurveParameter("Curves", "crvs", "Input curves", GH_ParamAccess.list);
        pManager.AddColourParameter("Color", "C", "Curve color", GH_ParamAccess.item, System.Drawing.Color.Black);
        pManager.AddIntegerParameter("Thickness", "T", "Curve thickness", GH_ParamAccess.item, 1);
    }

    protected override void RegisterOutputParams(GH_OutputParamManager pManager)
    {
        // Add output parameters if necessary
    }

    private bool _isComponentEnabled = true;

    public override void AddedToDocument(GH_Document document)
    {
        base.AddedToDocument(document);
        document.ObjectDisabled += Document_ObjectDisabled;
        document.ObjectEnabled += Document_ObjectEnabled;
    }

    private void Document_ObjectDisabled(GH_Document sender, GH_ObjectEventArgs e)
    {
        if (e.Object == this)
            _isComponentEnabled = false;
    }

    private void Document_ObjectEnabled(GH_Document sender, GH_ObjectEventArgs e)
    {
        if (e.Object == this)
            _isComponentEnabled = true;
    }

    protected override void SolveInstance(IGH_DataAccess DA)
    {
        List<Curve> crvs = new List<Curve>();
        System.Drawing.Color color = System.Drawing.Color.Black;
        int thickness = 1;

        if (!DA.GetDataList(0, crvs)) return;
        if (!DA.GetData(1, ref color)) return;
        if (!DA.GetData(2, ref thickness)) return;

        cc = crvs;
        co = color;
        thic = thickness;
    }

    public override BoundingBox ClippingBox
    {
        get
        {
            if (_isComponentEnabled && cc != null)
            {
                BoundingBox box = BoundingBox.Empty;
                foreach (Curve curve in cc)
                    box.Union(curve.GetBoundingBox(true));
                return box;
            }
            else
            {
                return BoundingBox.Empty;
            }
        }
    }

    public override void DrawViewportWires(IGH_PreviewArgs args)
    {
        if (_isComponentEnabled && cc != null)
        {
            foreach (Curve curve in cc)
                args.Display.DrawCurve(curve, co, thic);
        }
    }
}

详细解答：

1. 添加状态变量：首先，在组件类中添加一个布尔型变量 _isComponentEnabled，用于跟踪当前组件是否处于启用状态。

2. 监听文档对象状态变化：在 AddedToDocument 方法中，注册两个事件处理器：document.ObjectDisabled 和 document.ObjectEnabled。当组件被禁用或重新启用时，这些处理器会更新 _isComponentEnabled 的值。

3. 使用状态变量控制绘制：在 ClippingBox 和 DrawViewportWires 方法中，根据 _isComponentEnabled 的值决定是否进行计算和绘制。当组件被禁用时，返回空的 BoundingBox 并且不执行任何绘制操作。当组件启用时，按照原有逻辑计算包围盒和绘制曲线。

通过上述修改，您的组件在被禁用时将不再影响Rhino视口的预览显示。记得替换原有的代码段为上述提供的完整代码，并根据实际情况调整输入参数、输出参数、组件名称、类别等信息。这样，当您禁用电池后，预览样式将不再在Rhino空间中可见。