selection passt

Main.cs

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+using Godot;
+using System;
+
+public partial class Main : Node2D
+{
+	private PlantWorld _plantWorld;
+	private Camera2D _camera;
+	public override void _Ready()
+	{
+		_plantWorld = GetNode<PlantWorld>("PlantWorld");
+		_camera = GetNode<Camera2D>("Camera2D");
+		
+	}
+
+	
+	public override void _Process(double delta)
+	{
+	}
+}

PlantLife2D.csproj

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+<Project Sdk="Godot.NET.Sdk/4.2.0">
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework Condition=" '$(GodotTargetPlatform)' == 'android' ">net7.0</TargetFramework>
+    <TargetFramework Condition=" '$(GodotTargetPlatform)' == 'ios' ">net8.0</TargetFramework>
+    <EnableDynamicLoading>true</EnableDynamicLoading>
+  </PropertyGroup>
+</Project>

PlantLife2D.sln

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+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PlantLife2D", "PlantLife2D.csproj", "{E5DD50FC-19E9-4310-8B9A-081F7C32D1F3}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+	Debug|Any CPU = Debug|Any CPU
+	ExportDebug|Any CPU = ExportDebug|Any CPU
+	ExportRelease|Any CPU = ExportRelease|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E5DD50FC-19E9-4310-8B9A-081F7C32D1F3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E5DD50FC-19E9-4310-8B9A-081F7C32D1F3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E5DD50FC-19E9-4310-8B9A-081F7C32D1F3}.ExportDebug|Any CPU.ActiveCfg = ExportDebug|Any CPU
+		{E5DD50FC-19E9-4310-8B9A-081F7C32D1F3}.ExportDebug|Any CPU.Build.0 = ExportDebug|Any CPU
+		{E5DD50FC-19E9-4310-8B9A-081F7C32D1F3}.ExportRelease|Any CPU.ActiveCfg = ExportRelease|Any CPU
+		{E5DD50FC-19E9-4310-8B9A-081F7C32D1F3}.ExportRelease|Any CPU.Build.0 = ExportRelease|Any CPU
+	EndGlobalSection
+EndGlobal

PlantWorld.cs

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+using Godot;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+public partial class PlantWorld : Node2D
+{
+	[Export] public Camera2D Camera;
+	
+	[Signal] public delegate void PlantSelectedWithArgumentEventHandler(Plant plantRef);
+	
+	public PlantCollection Plants;
+	// Called when the node enters the scene tree for the first time.
+	public override void _Ready()
+	{
+		if (Camera == null)
+		{
+			GD.PrintErr("Keine Camera!!!!");
+			return;
+		}
+			
+		Plants = new PlantCollection();
+		Init();
+	}
+
+	public void Init()
+	{
+		CreatePlant(Vector2.Zero, 1024);
+	}
+
+	public void CreatePlant(Vector2 position, int initNodeCount = 512)
+	{
+		var plant = new Plant();
+		plant.Position = position;
+		plant.Init(initNodeCount);
+		AddChild(plant);
+		Plants.AddPlant(plant);
+		GD.Print("Plant erstellt: ", position);
+	}
+	public override void _Input(InputEvent @event)
+	{
+		if (@event is InputEventMouseButton eventMouseButton)
+		{
+			if (eventMouseButton.ButtonIndex == MouseButton.Left && eventMouseButton.Pressed)
+			{
+				var pos = eventMouseButton.Position * GetViewportTransform();
+				var pos2 = eventMouseButton.Position * Camera.GetViewportTransform();
+				var pos3 = eventMouseButton.Position * GetGlobalTransform();
+				
+				GD.Print("clicked mpos:", eventMouseButton.Position, ", ", pos, pos2, pos3 );
+				if (Plants.ClickedAtPlant(pos2) is { } plant)
+				{
+
+					GD.Print("HuRRA: ", plant.Segments.Count);
+					Plants.Selected = plant;
+					EmitSignal(SignalName.PlantSelectedWithArgument, plant);
+				}
+			}
+
+			if (eventMouseButton.ButtonIndex == MouseButton.Right && eventMouseButton.Pressed)
+			{
+				var pos = eventMouseButton.Position * GetViewportTransform();
+				CreatePlant(pos, 128);
+			}
+		}
+	}
+
+
+
+	// Called every frame. 'delta' is the elapsed time since the previous frame.
+	public override void _Process(double delta)
+	{
+		QueueRedraw();
+	}
+
+	public override void _Draw()
+	{
+		foreach (var plant in Plants.Plants)
+		{
+			var rect = plant.ClientRectangle.Grow(20);
+			//rect.Position = plant.Position + rect.Position;
+			DrawRect(rect, Colors.Green, filled:false);
+		}
+
+		if (Plants.Selected != null)
+		{
+			var plant = Plants.Selected;
+			var rect = plant.ClientRectangle.Grow(20) * Transform;
+			//rect.Position = plant.Position + rect.Position;
+			
+			DrawRect(rect.Grow(20), Colors.Yellow, filled: false, 12f);
+		}
+	}
+}
+
+
+public class PlantCollection 
+{
+	private List<Plant> _plants;
+
+	public Plant Selected = null;
+
+	public Plant this[int index]
+	{
+		get => _plants[index];
+	}
+	
+	public List<Plant> Plants
+	{
+		get { return _plants; }
+	}
+	
+	public PlantCollection()
+	{
+		_plants = new List<Plant>();
+	}
+	
+	public void AddPlant(Plant plant)
+	{
+		plant.CalulateClientRectangle();
+		if (CollidesWithAny(plant.ClientRectangle))
+			GD.PrintErr("Auf Pos ist bereits etwas vorhanden.");
+		_plants.Add(plant);
+		
+	}
+	public bool CollidesWithAny(Rect2 rect)
+	{
+		var intersections = _plants.Where(x => x.ClientRectangle.Intersects(rect)).ToList();
+		if (intersections.Count > 0)
+			return true;
+		else
+			return false;
+
+	}
+	public void CreateNew(Vector2 originPos,  int nodes = 512)
+	{
+		Plant plantLife = new Plant();
+		plantLife.Position = originPos;
+		plantLife.GrowDemo(nodes);
+		plantLife.CalulateClientRectangle();
+		_plants.Add(plantLife);
+	}
+
+	public Plant ClickedAtPlant(Vector2 posGlob)
+	{
+		foreach (var plant in _plants)
+		{
+			if (plant.ClientRectangle.HasPoint(posGlob))
+			{
+				Selected = plant;
+				return plant;
+			}
+		}
+
+		return null;
+	}
+
+}

plantWorld.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://cvjqldltcr7nl"]
+
+[ext_resource type="Script" path="res://PlantWorld.cs" id="1_0as8v"]
+[ext_resource type="Script" path="res://src/Plant.cs" id="1_68w2o"]
+
+[node name="PlantWorld" type="Node2D"]
+script = ExtResource("1_0as8v")
+
+[node name="Plant" type="MeshInstance2D" parent="."]
+script = ExtResource("1_68w2o")