本文介绍如何使用Unity创建一个基本的节点编辑器，涵盖创建窗口、节点、连接点及连接等功能，实现节点拖动、选择反馈、网格绘制等交互。
1.创建窗口（EditorWindow）
首先绘制元素，然后处理输入，如果GUI由于输入事件而改变，则强制窗口重新绘制。
using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
public class NodeBasedEditor : EditorWindow
{
[MenuItem("Window/Node Based Editor")]
private static void OpenWindow()
{
NodeBasedEditor window = GetWindow<NodeBasedEditor>();
window.titleContent = new GUIContent("Node Based Editor");
}
private void OnGUI()
{
DrawNodes();
ProcessEvents(Event.current);
if (GUI.changed) Repaint();
}
private void DrawNodes()
{
}
private void ProcessEvents(Event e)
{
}
}
2.创建节点
因为这是一个节点编辑器，它应该包含一个节点列表，这需要我们定义一个List <Node>。但首先我们应该定义Node类。一个节点将负责绘制本身和处理它自己的事件。不像ProcessEvents（事件e）在NodeBasedEditor，ProcessEvents（事件E）的节点将返回一个布尔值，这样我们就可以检查我们是否应该重新绘制GUI与否。
using System;
using UnityEditor;
using UnityEngine;
public class Node
{
public Rect rect;
public string title;
public GUIStyle style;
public Node(Vector2 position, float width, float height, GUIStyle nodeStyle)
{
rect = new Rect(position.x, position.y, width, height);
style = nodeStyle;
}
public void Drag(Vector2 delta)
{
rect.position += delta;
}
public void Draw()
{
GUI.Box(rect, title, style);
}
public bool ProcessEvents(Event e)
{
return false;
}
}
using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
public class NodeBasedEditor : EditorWindow
{
private List<Node> nodes;
[MenuItem("Window/Node Based Editor")]
private static void OpenWindow()
{
NodeBasedEditor window = GetWindow<NodeBasedEditor>();
window.titleContent = new GUIContent("Node Based Editor");
}
private void OnGUI()
{
DrawNodes();
ProcessEvents(Event.current);
if (GUI.changed) Repaint();
}
private void DrawNodes()
{
if (nodes != null)
{
for (int i = 0; i < nodes.Count; i++)
{
nodes[i].Draw();
}
}
}
private void ProcessEvents(Event e)
{
}
}
创建节点
节点现在在编辑器中绘制，但如果我们不创建它们，我们就看不到它们。当用户在编辑器中右键单击时，我们应该显示一个带有“添加节点”项的上下文菜单。当用户单击“添加节点”时，我们将创建一个节点并将其添加到节点列表中，以便绘制它。节点需要的位置，宽度，高度和造型; 位置将是鼠标的当前位置，宽度将为200，高度将为50。
using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
public class NodeBasedEditor : EditorWindow
{
private List<Node> nodes;
private GUIStyle nodeStyle;
[MenuItem("Window/Node Based Editor")]
private static void OpenWindow()
{
NodeBasedEditor window = GetWindow<NodeBasedEditor>();
window.titleContent = new GUIContent("Node Based Editor");
}
private void OnEnable()
{
nodeStyle = new GUIStyle();
nodeStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/node1.png") as Texture2D;
nodeStyle.border = new RectOffset(12, 12, 12, 12);
}
private void OnGUI()
{
DrawNodes();
ProcessEvents(Event.current);
if (GUI.changed) Repaint();
}
private void DrawNodes()
{
if (nodes != null)
{
for (int i = 0; i < nodes.Count; i++)
{
nodes[i].Draw();
}
}
}
private void ProcessEvents(Event e)
{
switch (e.type)
{
case EventType.MouseDown:
if (e.button == 1)
{
ProcessContextMenu(e.mousePosition);
}
break;
}
}
private void ProcessContextMenu(Vector2 mousePosition)
{
GenericMenu genericMenu = new GenericMenu();
genericMenu.AddItem(new GUIContent("Add node"), false, () => OnClickAddNode(mousePosition));
genericMenu.ShowAsContext();
}
private void OnClickAddNode(Vector2 mousePosition)
{
if (nodes == null)
{
nodes = new List<Node>();
}
nodes.Add(new Node(mousePosition, 200, 50, nodeStyle));
}
}
使节点可拖动
好的，现在我们可以添加节点，但我们无法拖动它们。正如我前面提到的，节点将处理自己的事件，因此我们将在Node类中处理drag事件。这里要注意的一件重要事情是我们应该使用Use（）方法“使用”拖动事件。稍后，我们将添加画布拖动，我们不希望同时拖动节点和整个画布（“使用”事件阻止其被其他进程使用，即它停止事件冒泡）。另请注意，ProcessNodeEvents（事件e）中的for循环向后遍历节点列表，因为最后一个节点是在顶部绘制的，因此它应该首先处理事件。
using System;
using UnityEditor;
using UnityEngine;
public class Node
{
public Rect rect;
public string title;
public bool isDragged;
public GUIStyle style;
public Node(Vector2 position, float width, float height, GUIStyle nodeStyle)
{
rect = new Rect(position.x, position.y, width, height);
style = nodeStyle;
}
public void Drag(Vector2 delta)
{
rect.position += delta;
}
public void Draw()
{
GUI.Box(rect, title, style);
}
public bool ProcessEvents(Event e)
{
switch (e.type)
{
case EventType.MouseDown:
if (e.button == 0)
{
if (rect.Contains(e.mousePosition))
{
isDragged = true;
GUI.changed = true;
}
else
{
GUI.changed = true;
}
}
break;
case EventType.MouseUp:
isDragged = false;
break;
case EventType.MouseDrag:
if (e.button == 0 && isDragged)
{
Drag(e.delta);
e.Use();
return true;
}
break;
}
return false;
}
}
public class NodeBasedEditor : EditorWindow{
。。。。。。。。。。
}
private void OnGUI()
{
DrawNodes();
ProcessNodeEvents(Event.current);
ProcessEvents(Event.current);
if (GUI.changed) Repaint();
}
private void DrawNodes()
{
if (nodes != null)
{
for (int i = 0; i < nodes.Count; i++)
{
nodes[i].Draw();
}
}
}
private void ProcessEvents(Event e)
{
switch (e.type)
{
case EventType.MouseDown:
if (e.button == 1)
{
ProcessContextMenu(e.mousePosition);
}
break;
}
}
private void ProcessNodeEvents(Event e)
{
if (nodes != null)
{
for (int i = nodes.Count - 1; i >= 0; i--)
{
bool guiChanged = nodes[i].ProcessEvents(e);
if (guiChanged)
{
GUI.changed = true;
}
}
}
}
private void ProcessContextMenu(Vector2 mousePosition)
{
GenericMenu genericMenu = new GenericMenu();
genericMenu.AddItem(new GUIContent("Add node"), false, () => OnClickAddNode(mousePosition));
genericMenu.ShowAsContext();
}
在节点之间创建连接
我们的节点编辑器现在有节点，但我们也应该能够连接它们。为此，我们需要节点上的两个连接点（输入和输出）以及它们之间的连接。连接点有一个矩形（这样我们可以绘制它），有一个类型（in或out），有一个样式，它引用它的父节点。因此，我们的ConnectionPoint类将是一个非常简单的类; 在特定位置绘制按钮，并在单击此按钮时执行操作。
另一方面，连接有两个连接点和一个删除它的操作。Connection类比ConnectionPoint简单得多，但它引入了一个新概念：Handles。此类实际上用于在“ 场景”视图中绘制3D GUI控件，但它是唯一具有贝塞尔绘图方法的类：Handles.DrawBezier（Vector3，Vector3，Vector3，Vector3，Color，Texture2D，float）。它需要7个参数，前4个参数是位置控制（起始位置，结束位置，开始切线和结束切线），而其余参数确定贝塞尔曲线的外观。
using System;
using UnityEngine;
public enum ConnectionPointType { In, Out }
public class ConnectionPoint
{
public Rect rect;
public ConnectionPointType type;
public Node node;
public GUIStyle style;
public Action<ConnectionPoint> OnClickConnectionPoint;
public ConnectionPoint(Node node, ConnectionPointType type, GUIStyle style, Action<ConnectionPoint> OnClickConnectionPoint)
{
this.node = node;
this.type = type;
this.style = style;
this.OnClickConnectionPoint = OnClickConnectionPoint;
rect = new Rect(0, 0, 10f, 20f);
}
public void Draw()
{
rect.y = node.rect.y + (node.rect.height * 0.5f) - rect.height * 0.5f;
switch (type)
{
case ConnectionPointType.In:
rect.x = node.rect.x - rect.width + 8f;
break;
case ConnectionPointType.Out:
rect.x = node.rect.x + node.rect.width - 8f;
break;
}
if (GUI.Button(rect, "", style))
{
if (OnClickConnectionPoint != null)
{
OnClickConnectionPoint(this);
}
}
}
}
using System;
using UnityEditor;
using UnityEngine;
public class Connection
{
public ConnectionPoint inPoint;
public ConnectionPoint outPoint;
public Action<Connection> OnClickRemoveConnection;
public Connection(ConnectionPoint inPoint, ConnectionPoint outPoint, Action<Connection> OnClickRemoveConnection)
{
this.inPoint = inPoint;
this.outPoint = outPoint;
this.OnClickRemoveConnection = OnClickRemoveConnection;
}
public void Draw()
{
Handles.DrawBezier(
inPoint.rect.center,
outPoint.rect.center,
inPoint.rect.center + Vector2.left * 50f,
outPoint.rect.center - Vector2.left * 50f,
Color.white,
null,
2f
);
if (Handles.Button((inPoint.rect.center + outPoint.rect.center) * 0.5f, Quaternion.identity, 4, 8, Handles.RectangleCap))
{
if (OnClickRemoveConnection != null)
{
OnClickRemoveConnection(this);
}
}
}
}
绘图连接
由于 Connection和ConnectionPoint类已准备就绪，我们所要做的就是在Node类中绘制连接点并在NodeBasedEditor中绘制连接。Node类的变化将是最小的; 我们将定义两个连接点，修改构造函数，以便我们可以为它们传递样式和操作，并在Draw（）方法中绘制它们。
但是，NodeBasedEditor需要进行重大修改。首先，我们需要为连接点定义样式。你可以为它们使用单一的样式，但我希望它们看起来不同，所以我将为每个样式使用单独的样式。我们将在OnEnable（）中初始化这些样式，就像我们初始化节点样式一样。
其次，我们需要跟踪点击连接点，这样，当用户选择的和出来，我们应该创建它们之间的连接。此步骤包括大多数添加内容：
- OnClickInPoint（ConnectionPoint）处理单击入点。
- OnClickOutPoint（ConnectionPoint）处理单击出点。
- OnClickRemoveConnection（连接）处理单击连接上的删除按钮。
- 创建连接（）创建一个当连接在和一个出点被选择。
- ClearConnectionSelection（）清除选定的点。
最后，我们需要在OnGUI（）中绘制连接，就像我们绘制节点一样。
using System;
using UnityEditor;
using UnityEngine;
public class Node
{
public Rect rect;
public string title;
public bool isDragged;
public ConnectionPoint inPoint;
public ConnectionPoint outPoint;
public GUIStyle style;
public Node(Vector2 position, float width, float height, GUIStyle nodeStyle, GUIStyle inPointStyle, GUIStyle outPointStyle, Action<ConnectionPoint> OnClickInPoint, Action<ConnectionPoint> OnClickOutPoint)
{
rect = new Rect(position.x, position.y, width, height);
style = nodeStyle;
inPoint = new ConnectionPoint(this, ConnectionPointType.In, inPointStyle, OnClickInPoint);
outPoint = new ConnectionPoint(this, ConnectionPointType.Out, outPointStyle, OnClickOutPoint);
}
public void Drag(Vector2 delta)
{
rect.position += delta;
}
public void Draw()
{
inPoint.Draw();
outPoint.Draw();
GUI.Box(rect, title, style);
}
public bool ProcessEvents(Event e)
{
switch (e.type)
{
case EventType.MouseDown:
if (e.button == 0)
{
if (rect.Contains(e.mousePosition))
{
isDragged = true;
GUI.changed = true;
}
else
{
GUI.changed = true;
}
}
break;
case EventType.MouseUp:
isDragged = false;
break;
case EventType.MouseDrag:
if (e.button == 0 && isDragged)
{
Drag(e.delta);
e.Use();
return true;
}
break;
}
return false;
}
}
using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
public class NodeBasedEditor : EditorWindow
{
private List<Node> nodes;
private List<Connection> connections;
private GUIStyle nodeStyle;
private GUIStyle inPointStyle;
private GUIStyle outPointStyle;
private ConnectionPoint selectedInPoint;
private ConnectionPoint selectedOutPoint;
[MenuItem("Window/Node Based Editor")]
private static void OpenWindow()
{
NodeBasedEditor window = GetWindow<NodeBasedEditor>();
window.titleContent = new GUIContent("Node Based Editor");
}
private void OnEnable()
{
nodeStyle = new GUIStyle();
nodeStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/node1.png") as Texture2D;
nodeStyle.border = new RectOffset(12, 12, 12, 12);
inPointStyle = new GUIStyle();
inPointStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn left.png") as Texture2D;
inPointStyle.active.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn left on.png") as Texture2D;
inPointStyle.border = new RectOffset(4, 4, 12, 12);
outPointStyle = new GUIStyle();
outPointStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn right.png") as Texture2D;
outPointStyle.active.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn right on.png") as Texture2D;
outPointStyle.border = new RectOffset(4, 4, 12, 12);
}
private void OnGUI()
{
DrawNodes();
DrawConnections();
ProcessNodeEvents(Event.current);
ProcessEvents(Event.current);
if (GUI.changed) Repaint();
}
private void DrawNodes()
{
if (nodes != null)
{
for (int i = 0; i < nodes.Count; i++)
{
nodes[i].Draw();
}
}
}
private void DrawConnections()
{
if (connections != null)
{
for (int i = 0; i < connections.Count; i++)
{
connections[i].Draw();
}
}
}
private void ProcessEvents(Event e)
{
switch (e.type)
{
case EventType.MouseDown:
if (e.button == 0)
{
ClearConnectionSelection();
}
if (e.button == 1)
{
ProcessContextMenu(e.mousePosition);
}
break;
}
}
private void ProcessNodeEvents(Event e)
{
if (nodes != null)
{
for (int i = nodes.Count - 1; i >= 0; i--)
{
bool guiChanged = nodes[i].ProcessEvents(e);
if (guiChanged)
{
GUI.changed = true;
}
}
}
}
private void ProcessContextMenu(Vector2 mousePosition)
{
GenericMenu genericMenu = new GenericMenu();
genericMenu.AddItem(new GUIContent("Add node"), false, () => OnClickAddNode(mousePosition));
genericMenu.ShowAsContext();
}
private void OnClickAddNode(Vector2 mousePosition)
{
if (nodes == null)
{
nodes = new List<Node>();
}
nodes.Add(new Node(mousePosition, 200, 50, nodeStyle, inPointStyle, outPointStyle, OnClickInPoint, OnClickOutPoint));
}
private void OnClickInPoint(ConnectionPoint inPoint)
{
selectedInPoint = inPoint;
if (selectedOutPoint != null)
{
if (selectedOutPoint.node != selectedInPoint.node)
{
CreateConnection();
ClearConnectionSelection();
}
else
{
ClearConnectionSelection();
}
}
}
private void OnClickOutPoint(ConnectionPoint outPoint)
{
selectedOutPoint = outPoint;
if (selectedInPoint != null)
{
if (selectedOutPoint.node != selectedInPoint.node)
{
CreateConnection();
ClearConnectionSelection();
}
else
{
ClearConnectionSelection();
}
}
}
private void OnClickRemoveConnection(Connection connection)
{
connections.Remove(connection);
}
private void CreateConnection()
{
if (connections == null)
{
connections = new List<Connection>();
}
connections.Add(new Connection(selectedInPoint, selectedOutPoint, OnClickRemoveConnection));
}
private void ClearConnectionSelection()
{
selectedInPoint = null;
selectedOutPoint = null;
}
}
选择节点
我们应该在用户点击某个节点时提供反馈，以便他们知道他们选择了哪个节点（或者根本就选择了一个节点）。当用户想要删除节点时，这将非常有用。
using System;
using UnityEditor;
using UnityEngine;
public class Node
{
public Rect rect;
public string title;
public bool isDragged;
public bool isSelected;
public ConnectionPoint inPoint;
public ConnectionPoint outPoint;
public GUIStyle style;
public GUIStyle defaultNodeStyle;
public GUIStyle selectedNodeStyle;
public Node(Vector2 position, float width, float height, GUIStyle nodeStyle, GUIStyle selectedStyle, GUIStyle inPointStyle, GUIStyle outPointStyle, Action<ConnectionPoint> OnClickInPoint, Action<ConnectionPoint> OnClickOutPoint)
{
rect = new Rect(position.x, position.y, width, height);
style = nodeStyle;
inPoint = new ConnectionPoint(this, ConnectionPointType.In, inPointStyle, OnClickInPoint);
outPoint = new ConnectionPoint(this, ConnectionPointType.Out, outPointStyle, OnClickOutPoint);
defaultNodeStyle = nodeStyle;
selectedNodeStyle = selectedStyle;
}
public void Drag(Vector2 delta)
{
rect.position += delta;
}
public void Draw()
{
inPoint.Draw();
outPoint.Draw();
GUI.Box(rect, title, style);
}
public bool ProcessEvents(Event e)
{
switch (e.type)
{
case EventType.MouseDown:
if (e.button == 0)
{
if (rect.Contains(e.mousePosition))
{
isDragged = true;
GUI.changed = true;
isSelected = true;
style = selectedNodeStyle;
}
else
{
GUI.changed = true;
isSelected = false;
style = defaultNodeStyle;
}
}
break;
case EventType.MouseUp:
isDragged = false;
break;
case EventType.MouseDrag:
if (e.button == 0 && isDragged)
{
Drag(e.delta);
e.Use();
return true;
}
break;
}
return false;
}
}
using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
public class NodeBasedEditor : EditorWindow
{
private List<Node> nodes;
private List<Connection> connections;
private GUIStyle nodeStyle;
private GUIStyle selectedNodeStyle;
private GUIStyle inPointStyle;
private GUIStyle outPointStyle;
private ConnectionPoint selectedInPoint;
private ConnectionPoint selectedOutPoint;
[MenuItem("Window/Node Based Editor")]
private static void OpenWindow()
{
NodeBasedEditor window = GetWindow<NodeBasedEditor>();
window.titleContent = new GUIContent("Node Based Editor");
}
private void OnEnable()
{
nodeStyle = new GUIStyle();
nodeStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/node1.png") as Texture2D;
nodeStyle.border = new RectOffset(12, 12, 12, 12);
selectedNodeStyle = new GUIStyle();
selectedNodeStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/node1 on.png") as Texture2D;
selectedNodeStyle.border = new RectOffset(12, 12, 12, 12);
inPointStyle = new GUIStyle();
inPointStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn left.png") as Texture2D;
inPointStyle.active.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn left on.png") as Texture2D;
inPointStyle.border = new RectOffset(4, 4, 12, 12);
outPointStyle = new GUIStyle();
outPointStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn right.png") as Texture2D;
outPointStyle.active.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn right on.png") as Texture2D;
outPointStyle.border = new RectOffset(4, 4, 12, 12);
}
...
NodeBasedEditor{。。。。。}
private void OnClickAddNode(Vector2 mousePosition)
{
if (nodes == null)
{
nodes = new List<Node>();
}
nodes.Add(new Node(mousePosition, 200, 50, nodeStyle, selectedNodeStyle, inPointStyle, outPointStyle, OnClickInPoint, OnClickOutPoint));
}
删除节点
某些节点编辑器更喜欢将删除节点按钮放在节点本身上，但在我们的情况下，它可能很危险：用户可能会意外删除节点。因此，我们将做下一个最好的事情：将该按钮放在上下文菜单上。用户应首先选择节点，然后右键单击该节点以访问 删除节点按钮。当用户单击删除节点时，我们将从节点列表中删除该节点。但是，节点可能与其他节点有连接，因此我们应首先删除这些连接。
using System;
using UnityEditor;
using UnityEngine;
public class Node
{
public Rect rect;
public string title;
public bool isDragged;
public bool isSelected;
public ConnectionPoint inPoint;
public ConnectionPoint outPoint;
public GUIStyle style;
public GUIStyle defaultNodeStyle;
public GUIStyle selectedNodeStyle;
public Action<Node> OnRemoveNode;
public Node(Vector2 position, float width, float height, GUIStyle nodeStyle, GUIStyle selectedStyle, GUIStyle inPointStyle, GUIStyle outPointStyle, Action<ConnectionPoint> OnClickInPoint, Action<ConnectionPoint> OnClickOutPoint, Action<Node> OnClickRemoveNode)
{
rect = new Rect(position.x, position.y, width, height);
style = nodeStyle;
inPoint = new ConnectionPoint(this, ConnectionPointType.In, inPointStyle, OnClickInPoint);
outPoint = new ConnectionPoint(this, ConnectionPointType.Out, outPointStyle, OnClickOutPoint);
defaultNodeStyle = nodeStyle;
selectedNodeStyle = selectedStyle;
OnRemoveNode = OnClickRemoveNode;
}
public void Drag(Vector2 delta)
{
rect.position += delta;
}
public void Draw()
{
inPoint.Draw();
outPoint.Draw();
GUI.Box(rect, title, style);
}
public bool ProcessEvents(Event e)
{
switch (e.type)
{
case EventType.MouseDown:
if (e.button == 0)
{
if (rect.Contains(e.mousePosition))
{
isDragged = true;
GUI.changed = true;
isSelected = true;
style = selectedNodeStyle;
}
else
{
GUI.changed = true;
isSelected = false;
style = defaultNodeStyle;
}
}
if (e.button == 1 && isSelected && rect.Contains(e.mousePosition))
{
ProcessContextMenu();
e.Use();
}
break;
case EventType.MouseUp:
isDragged = false;
break;
case EventType.MouseDrag:
if (e.button == 0 && isDragged)
{
Drag(e.delta);
e.Use();
return true;
}
break;
}
return false;
}
private void ProcessContextMenu()
{
GenericMenu genericMenu = new GenericMenu();
genericMenu.AddItem(new GUIContent("Remove node"), false, OnClickRemoveNode);
genericMenu.ShowAsContext();
}
private void OnClickRemoveNode()
{
if (OnRemoveNode != null)
{
OnRemoveNode(this);
}
}
}
NodeBasedEditor{。。。。。}
private void OnClickAddNode(Vector2 mousePosition)
{
if (nodes == null)
{
nodes = new List<Node>();
}
nodes.Add(new Node(mousePosition, 200, 50, nodeStyle, selectedNodeStyle, inPointStyle, outPointStyle, OnClickInPoint, OnClickOutPoint, OnClickRemoveNode));
}
NodeBasedEditor{。。。。。}
private void OnClickRemoveNode(Node node)
{
if (connections != null)
{
List<Connection> connectionsToRemove = new List<Connection>();
for (int i = 0; i < connections.Count; i++)
{
if (connections[i].inPoint == node.inPoint || connections[i].outPoint == node.outPoint)
{
connectionsToRemove.Add(connections[i]);
}
}
for (int i = 0; i < connectionsToRemove.Count; i++)
{
connections.Remove(connectionsToRemove[i]);
}
connectionsToRemove = null;
}
nodes.Remove(node);
}
最后的接触
此时节点编辑器已完成，但它缺少一些可以提升用户体验的重要功能：
- 可拖动的帆布，
- 从选定连接点到鼠标位置的贝塞尔曲线，
- 背景中的网格。
让我们的画布可拖动是最简单的，所以让我们从这开始。我们所要做的就是将鼠标拖动应用于节点列表中的每个节点。
NodeBasedEditor{。。。。。}
public class NodeBasedEditor : EditorWindow
{
private List<Node> nodes;
private List<Connection> connections;
private GUIStyle nodeStyle;
private GUIStyle selectedNodeStyle;
private GUIStyle inPointStyle;
private GUIStyle outPointStyle;
private ConnectionPoint selectedInPoint;
private ConnectionPoint selectedOutPoint;
private Vector2 drag;
...
private void ProcessEvents(Event e)
{
drag = Vector2.zero;
switch (e.type)
{
case EventType.MouseDown:
if (e.button == 0)
{
ClearConnectionSelection();
}
if (e.button == 1)
{
ProcessContextMenu(e.mousePosition);
}
break;
case EventType.MouseDrag:
if (e.button == 0)
{
OnDrag(e.delta);
}
break;
}
}
private void OnDrag(Vector2 delta)
{
drag = delta;
if (nodes != null)
{
for (int i = 0; i < nodes.Count; i++)
{
nodes[i].Drag(delta);
}
}
GUI.changed = true;
}
接下来，将贝塞尔曲线从选定的连接点绘制到鼠标位置。通过绘制这个bezier，我们将让用户知道选择了哪个连接点以及它们的连接方式。
private void OnGUI()
{
DrawNodes();
DrawConnections();
DrawConnectionLine(Event.current);
ProcessNodeEvents(Event.current);
ProcessEvents(Event.current);
if (GUI.changed) Repaint();
}
private void DrawConnectionLine(Event e)
{
if (selectedInPoint != null && selectedOutPoint == null)
{
Handles.DrawBezier(
selectedInPoint.rect.center,
e.mousePosition,
selectedInPoint.rect.center + Vector2.left * 50f,
e.mousePosition - Vector2.left * 50f,
Color.white,
null,
2f
);
GUI.changed = true;
}
if (selectedOutPoint != null && selectedInPoint == null)
{
Handles.DrawBezier(
selectedOutPoint.rect.center,
e.mousePosition,
selectedOutPoint.rect.center - Vector2.left * 50f,
e.mousePosition + Vector2.left * 50f,
Color.white,
null,
2f
);
GUI.changed = true;
}
}
最后，绘制网格：
public class NodeBasedEditor : EditorWindow
{
private List<Node> nodes;
private List<Connection> connections;
private GUIStyle nodeStyle;
private GUIStyle selectedNodeStyle;
private GUIStyle inPointStyle;
private GUIStyle outPointStyle;
private ConnectionPoint selectedInPoint;
private ConnectionPoint selectedOutPoint;
private Vector2 offset;
private Vector2 drag;
...
private void OnGUI()
{
DrawGrid(20, 0.2f, Color.gray);
DrawGrid(100, 0.4f, Color.gray);
DrawNodes();
DrawConnections();
DrawConnectionLine(Event.current);
ProcessNodeEvents(Event.current);
ProcessEvents(Event.current);
if (GUI.changed) Repaint();
}
private void DrawGrid(float gridSpacing, float gridOpacity, Color gridColor)
{
int widthDivs = Mathf.CeilToInt(position.width / gridSpacing);
int heightDivs = Mathf.CeilToInt(position.height / gridSpacing);
Handles.BeginGUI();
Handles.color = new Color(gridColor.r, gridColor.g, gridColor.b, gridOpacity);
offset += drag * 0.5f;
Vector3 newOffset = new Vector3(offset.x % gridSpacing, offset.y % gridSpacing, 0);
for (int i = 0; i < widthDivs; i++)
{
Handles.DrawLine(new Vector3(gridSpacing * i, -gridSpacing, 0) + newOffset, new Vector3(gridSpacing * i, position.height, 0f) + newOffset);
}
for (int j = 0; j < heightDivs; j++)
{
Handles.DrawLine(new Vector3(-gridSpacing, gridSpacing * j, 0) + newOffset, new Vector3(position.width, gridSpacing * j, 0f) + newOffset);
}
Handles.color = Color.white;
Handles.EndGUI();
}
完整脚本
using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
public class NodeBasedEditor : EditorWindow
{
private List<Node> nodes;
private List<Connection> connections;
private GUIStyle nodeStyle;
private GUIStyle selectedNodeStyle;
private GUIStyle inPointStyle;
private GUIStyle outPointStyle;
private ConnectionPoint selectedInPoint;
private ConnectionPoint selectedOutPoint;
private Vector2 offset;
private Vector2 drag;
[MenuItem("Window/Node Based Editor")]
private static void OpenWindow()
{
NodeBasedEditor window = GetWindow<NodeBasedEditor>();
window.titleContent = new GUIContent("Node Based Editor");
}
private void OnEnable()
{
nodeStyle = new GUIStyle();
nodeStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/node1.png") as Texture2D;
nodeStyle.border = new RectOffset(12, 12, 12, 12);
selectedNodeStyle = new GUIStyle();
selectedNodeStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/node1 on.png") as Texture2D;
selectedNodeStyle.border = new RectOffset(12, 12, 12, 12);
inPointStyle = new GUIStyle();
inPointStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn left.png") as Texture2D;
inPointStyle.active.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn left on.png") as Texture2D;
inPointStyle.border = new RectOffset(4, 4, 12, 12);
outPointStyle = new GUIStyle();
outPointStyle.normal.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn right.png") as Texture2D;
outPointStyle.active.background = EditorGUIUtility.Load("builtin skins/darkskin/images/btn right on.png") as Texture2D;
outPointStyle.border = new RectOffset(4, 4, 12, 12);
}
private void OnGUI()
{
DrawGrid(20, 0.2f, Color.gray);
DrawGrid(100, 0.4f, Color.gray);
DrawNodes();
DrawConnections();
DrawConnectionLine(Event.current);
ProcessNodeEvents(Event.current);
ProcessEvents(Event.current);
if (GUI.changed) Repaint();
}
private void DrawGrid(float gridSpacing, float gridOpacity, Color gridColor)
{
int widthDivs = Mathf.CeilToInt(position.width / gridSpacing);
int heightDivs = Mathf.CeilToInt(position.height / gridSpacing);
Handles.BeginGUI();
Handles.color = new Color(gridColor.r, gridColor.g, gridColor.b, gridOpacity);
offset += drag * 0.5f;
Vector3 newOffset = new Vector3(offset.x % gridSpacing, offset.y % gridSpacing, 0);
for (int i = 0; i < widthDivs; i++)
{
Handles.DrawLine(new Vector3(gridSpacing * i, -gridSpacing, 0) + newOffset, new Vector3(gridSpacing * i, position.height, 0f) + newOffset);
}
for (int j = 0; j < heightDivs; j++)
{
Handles.DrawLine(new Vector3(-gridSpacing, gridSpacing * j, 0) + newOffset, new Vector3(position.width, gridSpacing * j, 0f) + newOffset);
}
Handles.color = Color.white;
Handles.EndGUI();
}
private void DrawNodes()
{
if (nodes != null)
{
for (int i = 0; i < nodes.Count; i++)
{
nodes[i].Draw();
}
}
}
private void DrawConnections()
{
if (connections != null)
{
for (int i = 0; i < connections.Count; i++)
{
connections[i].Draw();
}
}
}
private void ProcessEvents(Event e)
{
drag = Vector2.zero;
switch (e.type)
{
case EventType.MouseDown:
if (e.button == 0)
{
ClearConnectionSelection();
}
if (e.button == 1)
{
ProcessContextMenu(e.mousePosition);
}
break;
case EventType.MouseDrag:
if (e.button == 0)
{
OnDrag(e.delta);
}
break;
}
}
private void ProcessNodeEvents(Event e)
{
if (nodes != null)
{
for (int i = nodes.Count - 1; i >= 0; i--)
{
bool guiChanged = nodes[i].ProcessEvents(e);
if (guiChanged)
{
GUI.changed = true;
}
}
}
}
private void DrawConnectionLine(Event e)
{
if (selectedInPoint != null && selectedOutPoint == null)
{
Handles.DrawBezier(
selectedInPoint.rect.center,
e.mousePosition,
selectedInPoint.rect.center + Vector2.left * 50f,
e.mousePosition - Vector2.left * 50f,
Color.white,
null,
2f
);
GUI.changed = true;
}
if (selectedOutPoint != null && selectedInPoint == null)
{
Handles.DrawBezier(
selectedOutPoint.rect.center,
e.mousePosition,
selectedOutPoint.rect.center - Vector2.left * 50f,
e.mousePosition + Vector2.left * 50f,
Color.white,
null,
2f
);
GUI.changed = true;
}
}
private void ProcessContextMenu(Vector2 mousePosition)
{
GenericMenu genericMenu = new GenericMenu();
genericMenu.AddItem(new GUIContent("Add node"), false, () => OnClickAddNode(mousePosition));
genericMenu.ShowAsContext();
}
private void OnDrag(Vector2 delta)
{
drag = delta;
if (nodes != null)
{
for (int i = 0; i < nodes.Count; i++)
{
nodes[i].Drag(delta);
}
}
GUI.changed = true;
}
private void OnClickAddNode(Vector2 mousePosition)
{
if (nodes == null)
{
nodes = new List<Node>();
}
nodes.Add(new Node(mousePosition, 200, 50, nodeStyle, selectedNodeStyle, inPointStyle, outPointStyle, OnClickInPoint, OnClickOutPoint, OnClickRemoveNode));
}
private void OnClickInPoint(ConnectionPoint inPoint)
{
selectedInPoint = inPoint;
if (selectedOutPoint != null)
{
if (selectedOutPoint.node != selectedInPoint.node)
{
CreateConnection();
ClearConnectionSelection();
}
else
{
ClearConnectionSelection();
}
}
}
private void OnClickOutPoint(ConnectionPoint outPoint)
{
selectedOutPoint = outPoint;
if (selectedInPoint != null)
{
if (selectedOutPoint.node != selectedInPoint.node)
{
CreateConnection();
ClearConnectionSelection();
}
else
{
ClearConnectionSelection();
}
}
}
private void OnClickRemoveNode(Node node)
{
if (connections != null)
{
List<Connection> connectionsToRemove = new List<Connection>();
for (int i = 0; i < connections.Count; i++)
{
if (connections[i].inPoint == node.inPoint || connections[i].outPoint == node.outPoint)
{
connectionsToRemove.Add(connections[i]);
}
}
for (int i = 0; i < connectionsToRemove.Count; i++)
{
connections.Remove(connectionsToRemove[i]);
}
connectionsToRemove = null;
}
nodes.Remove(node);
}
private void OnClickRemoveConnection(Connection connection)
{
connections.Remove(connection);
}
private void CreateConnection()
{
if (connections == null)
{
connections = new List<Connection>();
}
connections.Add(new Connection(selectedInPoint, selectedOutPoint, OnClickRemoveConnection));
}
private void ClearConnectionSelection()
{
selectedInPoint = null;
selectedOutPoint = null;
}
}
using System;
using UnityEditor;
using UnityEngine;
public class Node
{
public Rect rect;
public string title;
public bool isDragged;
public bool isSelected;
public ConnectionPoint inPoint;
public ConnectionPoint outPoint;
public GUIStyle style;
public GUIStyle defaultNodeStyle;
public GUIStyle selectedNodeStyle;
public Action<Node> OnRemoveNode;
public Node(Vector2 position, float width, float height, GUIStyle nodeStyle, GUIStyle selectedStyle, GUIStyle inPointStyle, GUIStyle outPointStyle, Action<ConnectionPoint> OnClickInPoint, Action<ConnectionPoint> OnClickOutPoint, Action<Node> OnClickRemoveNode)
{
rect = new Rect(position.x, position.y, width, height);
style = nodeStyle;
inPoint = new ConnectionPoint(this, ConnectionPointType.In, inPointStyle, OnClickInPoint);
outPoint = new ConnectionPoint(this, ConnectionPointType.Out, outPointStyle, OnClickOutPoint);
defaultNodeStyle = nodeStyle;
selectedNodeStyle = selectedStyle;
OnRemoveNode = OnClickRemoveNode;
}
public void Drag(Vector2 delta)
{
rect.position += delta;
}
public void Draw()
{
inPoint.Draw();
outPoint.Draw();
GUI.Box(rect, title, style);
}
public bool ProcessEvents(Event e)
{
switch (e.type)
{
case EventType.MouseDown:
if (e.button == 0)
{
if (rect.Contains(e.mousePosition))
{
isDragged = true;
GUI.changed = true;
isSelected = true;
style = selectedNodeStyle;
}
else
{
GUI.changed = true;
isSelected = false;
style = defaultNodeStyle;
}
}
if (e.button == 1 && isSelected && rect.Contains(e.mousePosition))
{
ProcessContextMenu();
e.Use();
}
break;
case EventType.MouseUp:
isDragged = false;
break;
case EventType.MouseDrag:
if (e.button == 0 && isDragged)
{
Drag(e.delta);
e.Use();
return true;
}
break;
}
return false;
}
private void ProcessContextMenu()
{
GenericMenu genericMenu = new GenericMenu();
genericMenu.AddItem(new GUIContent("Remove node"), false, OnClickRemoveNode);
genericMenu.ShowAsContext();
}
private void OnClickRemoveNode()
{
if (OnRemoveNode != null)
{
OnRemoveNode(this);
}
}
}
using System;
using UnityEditor;
using UnityEngine;
public class Connection
{
public ConnectionPoint inPoint;
public ConnectionPoint outPoint;
public Action<Connection> OnClickRemoveConnection;
public Connection(ConnectionPoint inPoint, ConnectionPoint outPoint, Action<Connection> OnClickRemoveConnection)
{
this.inPoint = inPoint;
this.outPoint = outPoint;
this.OnClickRemoveConnection = OnClickRemoveConnection;
}
public void Draw()
{
Handles.DrawBezier(
inPoint.rect.center,
outPoint.rect.center,
inPoint.rect.center + Vector2.left * 50f,
outPoint.rect.center - Vector2.left * 50f,
Color.white,
null,
2f
);
if (Handles.Button((inPoint.rect.center + outPoint.rect.center) * 0.5f, Quaternion.identity, 4, 8, Handles.RectangleCap))
{
if (OnClickRemoveConnection != null)
{
OnClickRemoveConnection(this);
}
}
}
}
using System;
using UnityEngine;
public enum ConnectionPointType { In, Out }
public class ConnectionPoint
{
public Rect rect;
public ConnectionPointType type;
public Node node;
public GUIStyle style;
public Action<ConnectionPoint> OnClickConnectionPoint;
public ConnectionPoint(Node node, ConnectionPointType type, GUIStyle style, Action<ConnectionPoint> OnClickConnectionPoint)
{
this.node = node;
this.type = type;
this.style = style;
this.OnClickConnectionPoint = OnClickConnectionPoint;
rect = new Rect(0, 0, 10f, 20f);
}
public void Draw()
{
rect.y = node.rect.y + (node.rect.height * 0.5f) - rect.height * 0.5f;
switch (type)
{
case ConnectionPointType.In:
rect.x = node.rect.x - rect.width + 8f;
break;
case ConnectionPointType.Out:
rect.x = node.rect.x + node.rect.width - 8f;
break;
}
if (GUI.Button(rect, "", style))
{
if (OnClickConnectionPoint != null)
{
OnClickConnectionPoint(this);
}
}
}
}
扫一扫
619
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
