xNode/Scripts/Editor/NodeEditorWindow.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using System.IO;

[InitializeOnLoad]
public partial class NodeEditorWindow : EditorWindow {

    string saved;
    
    public Dictionary<NodePort, Vector2> portConnectionPoints { get { return _portConnectionPoints; } }
    private Dictionary<NodePort, Vector2> _portConnectionPoints = new Dictionary<NodePort, Vector2>();
    private Dictionary<NodePort, Rect> portRects = new Dictionary<NodePort, Rect>();
    public NodeGraph graph { get { return _graph != null ? _graph : _graph = new NodeGraph(); } }
    public NodeGraph _graph;
    public Vector2 panOffset { get { return _panOffset; } set { _panOffset = value; Repaint(); } }
    private Vector2 _panOffset;
    public float zoom { get { return _zoom; } set { _zoom = Mathf.Clamp(value, 1f, 5f); Repaint(); } }
    private float _zoom = 1; 

    partial void OnEnable();

    [MenuItem("Window/UNEC")]
    static void Init() {
        NodeEditorWindow w = CreateInstance<NodeEditorWindow>();
        w.titleContent = new GUIContent("UNEC");
        w.wantsMouseMove = true;
        w.Show();
    }

    public void Save() {
        saved = graph.Serialize();
    }

    public void Load() {
        _graph = NodeGraph.Deserialize(saved);
    }

    private void DraggableWindow(int windowID) {
        GUI.DragWindow();
    }

    public Vector2 WindowToGridPosition(Vector2 windowPosition) {
        return (windowPosition - (position.size * 0.5f) - (panOffset / zoom)) * zoom;
    }

    public Vector2 GridToWindowPosition(Vector2 gridPosition) {
        return (position.size * 0.5f) + (panOffset / zoom) + (gridPosition/zoom);
    }

    public Vector2 GridToWindowPositionNoClipped(Vector2 gridPosition) {
        Vector2 center = position.size * 0.5f;
        float xOffset = (center.x * zoom + (panOffset.x + gridPosition.x));
        float yOffset = (center.y * zoom + (panOffset.y + gridPosition.y));
        return new Vector2(xOffset, yOffset);
    }

    public void SelectNode(Node node) {
        selectedNode = node;
    }

}