Scripts/Helpers/GameData.cs

@@ -19,7 +19,7 @@ public partial class GameData
     public static float tileWidth = 6;
     public static float tileHeight = 4;
     public static SortedDictionary<string, ItemData> availableItems = ResourceLoader.LoadItems();
-    public static Dictionary<string, ResearchData> availableResearch = ResourceLoader.LoadResearch();
+    public static Dictionary<string, Research> availableResearch = ResourceLoader.LoadResearch();
 
     //--- PLAYER ADJUSTABLE VALUES ---
     //Color used in primary objects (e.g. Robots)

Scripts/Helpers/ResourceLoader.cs

@@ -102,18 +102,18 @@ public partial class ResourceLoader
 		return result;
 	}
 
-	public static Dictionary<string, ResearchData> LoadResearch()
+	public static Dictionary<string, Research> LoadResearch()
 	{
 
 		FileAccess file = FileAccess.Open("res://Assets/Research.json", FileAccess.ModeFlags.Read);
 		string json = file.GetAsText();
 
-		Dictionary<string, ResearchData> result = new();
+		Dictionary<string, Research> result = new();
 
 		List<ResearchData> researches = JsonSerializer.Deserialize<List<ResearchData>>(json);
 		foreach (ResearchData research in researches)
 		{
-			result.Add(research.Id, research);
+			result.Add(research.Id, new Research(research));
 		}
 
 		return result;

Scripts/Research/Research.cs

@@ -3,9 +3,15 @@ using Godot;
 public class Research
 {
     public ResearchData data;
-    public bool isResearched = false;
     public double elapsedResearchTime = 0;
     public bool paidResources = false;
+    public ResearchState state;
+
+    public Research(ResearchData data)
+    {
+        this.data = data;
+        state = ResearchState.UNDEFINED;
+    }
 
     public ResearchResult Execute(double delta)
     {
@@ -20,7 +26,7 @@ public class Research
         elapsedResearchTime += delta;
         if (elapsedResearchTime >= data.CraftTime)
         {
-            isResearched = true;
+            state = ResearchState.RESEARCHED;
             return ResearchResult.FINISHED;
         }
         return ResearchResult.RESEARCHING;

Scripts/Research/ResearchList.cs

@@ -1,49 +1,118 @@
+using System.Collections.Generic;
+using System.Linq;
 using Godot;
+using Godot.Collections;
 
 public partial class ResearchList : PanelContainer
 {
-	[Export] GraphEdit researchGraph;
+	[Export] private GraphEdit researchGraph;
+
+	private const float StartXDivisor = 32f;
+	private const float StartYDivisor = 4f;
+	private const float NodeSpacingMultiplier = 10f;
+
+	private List<string> reloadKeys = new List<string>();
 
 	public override void _Ready()
 	{
-		foreach (ResearchData research in GameData.availableResearch.Values)
+		RecalculateResearchStates();
+		SetupGraph();
+	}
+
+	public void SetupGraph()
+	{
+		reloadKeys = new List<string>();
+		ClearGraph();
+		CreateResearchNodes();
+		CreateResearchConnections();
+	}
+
+	private void ClearGraph()
+	{
+		foreach (Dictionary connection in researchGraph.GetConnectionList())
 		{
-			researchGraph.AddChild(CreateItemNode(research.Id, research.Texture));
+			researchGraph.DisconnectNode(
+				connection["from_node"].AsStringName(),
+				(int)connection["from_port"],
+				connection["to_node"].AsStringName(),
+				(int)connection["to_port"]
+			);
 		}
-		foreach (ResearchData research in GameData.availableResearch.Values)
+
+		foreach (Node child in researchGraph.GetChildren())
 		{
+			if (child is GraphNode)
+			{
+				researchGraph.RemoveChild(child);
+				child.QueueFree();
+			}
+		}
+	}
+
+	private void CreateResearchNodes()
+	{
+		foreach (Research research in GameData.availableResearch.Values)
+		{
+			GD.Print(research.state);
+			GraphNode node = CreateResearchNode(
+				research.data.Id,
+				research.data.Texture,
+				research.state
+			);
+
+			researchGraph.AddChild(node);
+		}
+	}
+
+	private void CreateResearchConnections()
+	{
+		foreach (Research research in GameData.availableResearch.Values)
+		{
+			string prerequisite = research.data.Research;
+			string current = research.data.Id;
+
+			if (string.IsNullOrEmpty(prerequisite))
+				continue;
+
+			if (!researchGraph.HasNode(prerequisite) || !researchGraph.HasNode(current))
+				continue;
+
 			researchGraph.ConnectNode(
-					research.Research,
-					0,
-					research.Id,
-					0
-				);
+				prerequisite,
+				0,
+				current,
+				0
+			);
 		}
 	}
 
-	public override void _Process(double delta)
+	private GraphNode CreateResearchNode(string id, string texturePath, ResearchState state)
 	{
+		Texture2D texture = GD.Load<Texture2D>(texturePath);
+		Color stateColor = GetColorByState(state);
 
-	}
-
-	private GraphNode CreateItemNode(string id, string texturePath)
-	{
-		Vector2 viewportSize = GetViewport().GetVisibleRect().Size;
 		TextureRect icon = new TextureRect
 		{
-			Texture = GD.Load<Texture2D>(texturePath),
-			StretchMode = TextureRect.StretchModeEnum.KeepAspectCentered
+			Texture = texture,
+			StretchMode = TextureRect.StretchModeEnum.KeepAspectCentered,
+			CustomMinimumSize = new Vector2(64, 64),
+			SelfModulate = stateColor
 		};
-		//Step 1: Place the node in the visible field for the player
-		Vector2 nodePosition = new Vector2(viewportSize.X  / 32, viewportSize.Y / 4);
-		//Step 2: Modify position by nodeIndex
-		nodePosition = nodePosition + new Vector2(GameData.availableResearch.Count * -icon.Texture.GetWidth() + researchGraph.GetChildCount() * icon.Texture.GetWidth() * 10, 0);
+
+		Button button = new Button
+		{
+			Text = "Research",
+			Disabled = state != ResearchState.AVAILABLE
+		};
+
+		button.Pressed += () => OnResearchPressed(id);
 
 		GraphNode node = new GraphNode
 		{
 			Name = id,
 			Title = id,
-			PositionOffset = nodePosition
+			PositionOffset = GetNodePosition(texture),
+			SelfModulate = stateColor
 		};
 
 		node.SetSlot(
@@ -57,7 +126,86 @@ public partial class ResearchList : PanelContainer
 		);
 
 		node.AddChild(icon);
+		node.AddChild(button);
 
 		return node;
 	}
+
+	private Vector2 GetNodePosition(Texture2D texture)
+	{
+		Vector2 viewportSize = GetViewport().GetVisibleRect().Size;
+
+		float textureWidth = texture?.GetWidth() ?? 64f;
+
+		Vector2 startPosition = new Vector2(
+			viewportSize.X / StartXDivisor,
+			viewportSize.Y / StartYDivisor
+		);
+
+		float xOffset =
+			GameData.availableResearch.Count * -textureWidth +
+			researchGraph.GetChildCount() * textureWidth * NodeSpacingMultiplier;
+
+		return startPosition + new Vector2(xOffset, 0);
+	}
+
+	private void OnResearchPressed(string id)
+	{
+		GameData.availableResearch[id].state = ResearchState.RESEARCHED;
+		RecalculateResearchStates();
+		SetupGraph();
+	}
+
+	private void RecalculateResearchStates()
+	{
+		bool changedState;
+		foreach (string key in GameData.availableResearch.Keys)
+		{
+			changedState = false;
+			if (reloadKeys.Contains(key)) continue;
+			reloadKeys.Add(key);
+
+			//Already researched
+			if (GameData.availableResearch[key].state == ResearchState.RESEARCHED)
+			{
+				changedState = true;
+			}
+
+			//No previous research needed
+			if (GameData.availableResearch[key].data.Research.Length <= 0)
+			{
+				GameData.availableResearch[key].state = ResearchState.RESEARCHED;
+				changedState = true;
+			}
+
+			//Previous research is unlocked
+			if (!changedState && GameData.availableResearch[GameData.availableResearch[key].data.Research].state == ResearchState.RESEARCHED)
+			{
+				GameData.availableResearch[key].state = ResearchState.AVAILABLE;
+				changedState = true;
+			}
+
+			if (!changedState)
+			{
+				//All others are locked
+				GameData.availableResearch[key].state = ResearchState.LOCKED;
+			}
+
+			if (reloadKeys.Count != GameData.availableResearch.Keys.Count)
+			{
+				RecalculateResearchStates();
+			}
+		}
+	}
+
+	private Color GetColorByState(ResearchState state)
+	{
+		return state switch
+		{
+			ResearchState.AVAILABLE => Colors.White,
+			ResearchState.LOCKED => new Color(0.6f, 0.6f, 0.6f, 0.5f),
+			ResearchState.RESEARCHED => new Color(0.7f, 1f, 0.7f, 1f),
+			_ => Colors.Red
+		};
+	}
 }

Scripts/Research/ResearchState.cs

@@ -0,0 +1,7 @@
+public enum ResearchState
+{
+    UNDEFINED,
+    RESEARCHED,
+    AVAILABLE,
+    LOCKED
+}

Scripts/Research/ResearchState.cs.uid

@@ -0,0 +1 @@
+uid://b57yhucbav37c