Structuring a Nested Data from a Custom Class

So Im writing a plugin in C# in Visual Studio, and have these two basic classes:

Class: FlatPanel or Curved Panel (both implement IPanel)

List <PanelComponent> panelComponents;

Class: PanelComponent

List <GeometryBase> geoms;

Dict <string, string> props;

In Grasshopper, I am feeding a (custom) "Unwrap Panel Contents" component a tree of panels in the format {a;b}(n). In this tree, "a" corresponds to the building floor and "b" corresponds to the location on the floor; n is always a single item, the panel class.

I'm trying to write the "Unwrap Panel Contents" component such that when it "unwraps" the panel, it does so in a structured way. Ideally, I want the output structure to be in the format {a;b;c}(n), where a and b are the same as above, c corresponds to the index of the panel component, and n is a list of stuff.

I've hit a few stumbling points...

I defined "PanelGoo" and had it implement "GH_Goo<IPanel>". I'm not sure what to put in these:

public override bool IsValid

public override string TypeDescription

public override string TypeName

public override IGH_Goo Duplicate()

public override string ToString()

In solveInstance, I'm stuck after just these lines:

GH_Structure<PanelGoo> panels = new GH_Structure<PanelGoo>();
if (!DA.GetDataTree<PanelGoo>(0, out panels)) return;

for (int i = 0; i < panels.PathCount; i++)
{
GH_Path pth = panels.Path[i];
IPanel panel = panels.Branch[pth];
}

I get two errors:

Property, indexer, or event 'GH_Structure<PanelGoo>.Path[int]' is not supported by the language; try directly calling accessor method 'GH_Structure<PanelGoo>.get_Path(int)'

Property, indexer, or event 'GH_Structure<PanelGoo>.Branch[GH_Path]' is not supported by the language; try directly calling accessor method 'GH_Structure<PanelGoo>.get_Branch(GH_Path)'

Side note:

I also tried using GetData/ Item access instead, hoping that maybe the output would get "tree'd" after leaving SolveInstance, but that doesn't seem to work, I just get a single list from each output, no structure.

I've been studying this thread obsessively:

http://www.grasshopper3d.com/forum/topics/custom-data-type-gh-geome...

Been trying to deconstruct the code examples, but not making much progress. Could anyone offer some guidance on handling a tree as an input?

Thanks

Replies to This Discussion

Permalink Reply by Matthew Breau on June 7, 2017 at 10:44pm

This seems closer to working, but Im still getting an error:

'object' does not contain a definition for 'panelComponents' and no extension method 'panelComponents' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)

It seems like I can traverse the GH_Structure alright, but as soon as I try to use any of the Panel class's methods or properties, I hit an error. I think I need to cast or convert out of IGH_Goo back into the panel class..?

GH_Structure<IGH_Goo> panelsTree = new GH_Structure<IGH_Goo>();
if (!DA.GetDataTree<IGH_Goo>(0, out panelsTree)) return;

IList <GH_Path> allPaths = panelsTree.Paths;

List<string> pathStrings = new List<string>();
DataTree<GeometryBase> outputGeometries = new DataTree<GeometryBase>();

foreach (GH_Path onePath in allPaths) {

foreach (System.Collections.IList panelsBranch in panelsTree.Branches) {
foreach (GH_ObjectWrapper wrappedObject in panelsBranch) {
var panel = wrappedObject.Value;

foreach (PanelComponent panelComponent in panel.panelComponents) {
outputGeometries.EnsurePath(onePath);
outputGeometries.AddRange(panelComponent.geom, onePath);
}

}
}
pathStrings.Add(onePath.ToString());
}

DA.SetDataTree(0, outputGeometries);
DA.SetDataList(1, pathStrings);

Permalink Reply by Matthew Breau on June 12, 2017 at 5:01pm

I have something that I think is almost working... It compiles, but when I test it, I get this error:

"An exception of type 'System.InvalidCastException' occurred in Ocammy.gha but was not handled in user code

Additional information: Unable to cast object of type 'Rhino.Geometry.Brep' to type 'Grasshopper.Kernel.Types.IGH_GeometricGoo'."

Am I making some obvious mistake? I attached my code, also.

Attachments: