1

Src/Unity/Scripts/UX/Painter/BITKit.UX.Painter.Runtime.asmdef

@@ -0,0 +1,25 @@
+{
+    "name": "BITKit.UX.Painter.Runtime",
+    "rootNamespace": "",
+    "references": [
+        "GUID:14fe60d984bf9f84eac55c6ea033a8f4",
+        "GUID:6ef4ed8ff60a7aa4bb60a8030e6f4008",
+        "GUID:d525ad6bd40672747bde77962f1c401e",
+        "GUID:49b49c76ee64f6b41bf28ef951cb0e50",
+        "GUID:d8b63aba1907145bea998dd612889d6b",
+        "GUID:6de01b04fa4e14662b03fa46366da151",
+        "GUID:f19bbd83e3c264a5680926bf75d7e494",
+        "GUID:1c2aa13aa706ffc49a1a0044cad55436"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [
+        "_SkiaSharp"
+    ],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Src/Unity/Scripts/UX/Painter/BITKit.UX.Painter.Runtime.asmdef.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 5cbf6465b63af3e4da531a4e4d26376b
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Src/Unity/Scripts/UX/Painter/SkiaPainter.cs

@@ -0,0 +1,150 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Sockets.Kcp;
+using SkiaSharp;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace BITKit.UX
+{
+	public class SkiaPainter : VisualElement
+	{
+		public new class UxmlFactory : UxmlFactory<SkiaPainter, UxmlTraits> { }
+		public SkiaPainter()
+		{
+			RegisterCallback<GeometryChangedEvent>(OnGeometryChanged);
+			RegisterCallback<MouseDownEvent>(OnMouseDown);
+			RegisterCallback<MouseUpEvent>(OnMouseUp);
+			RegisterCallback<MouseMoveEvent>(OnMouseMove);
+		}
+
+	
+		private bool _isPainting;
+		private readonly List<Vector2> _points = new();
+		private SKImageInfo _info;
+		private SKCanvas _canvas;
+		private SKSurface _surface;
+		private Rect _rect;
+		private Optional<SKColor> _backgroundColor=new ();
+		// private readonly SKPaint _linePaint = new()
+		// {
+		// 	Style = SKPaintStyle.Stroke,
+		// 	Color = SKColors.Red,
+		// 	StrokeWidth = 5,
+		// };
+		private readonly SKPaint _linePaint = new SKPaint
+		{
+			Style = SKPaintStyle.Stroke,
+			Color = SKColors.Black, // 笔画颜色为黑色
+			StrokeCap = SKStrokeCap.Round, // 笔画末端采用圆形
+			StrokeJoin = SKStrokeJoin.Round, // 笔画连接处采用圆形
+			StrokeWidth = 8, // 笔画宽度
+			IsAntialias = true // 使用抗锯齿
+		};
+		public void ClearCanvas()
+		{
+			_points.Clear();
+			Rebuild();
+		}
+		private void OnMouseMove(MouseMoveEvent evt)
+		{
+			if (_isPainting is false) return;
+			var pos = evt.localMousePosition;
+			pos.y = layout.height - pos.y;
+			
+			var last = _points.LastOrDefault();
+			
+			if (_rect.Contains(pos) is false)
+			{
+			
+				if (last == default) return;
+			
+				_points.Add(default);
+				return;
+			}
+
+			var originalPos = pos;
+			if (last != default)
+			{
+				//pos = Vector2.Lerp(last, pos, 0.1f);
+				
+				_points.Add(Vector2.Lerp(last, pos, 0.1f));
+				_points.Add(Vector2.Lerp(last, pos, 0.2f));
+				//_points.Add(Vector2.Lerp(last, pos, 1f));
+			}
+			else
+			{
+				_points.Add(pos);
+			}
+			
+			//_points.Add(pos);
+
+			if (originalPos != pos)
+			{
+				//_points.Add(originalPos);
+			}
+			Rebuild();
+		}
+
+		private void OnMouseUp(MouseUpEvent evt)
+		{
+			_isPainting = false;
+			var last = _points.LastOrDefault();
+			if (last != default)
+				_points.Add(default);
+		}
+
+		private void OnMouseDown(MouseDownEvent evt)
+		{
+			_isPainting = true;
+		}
+		private void OnGeometryChanged(GeometryChangedEvent evt)
+		{
+			if(float.IsNaN(layout.width) || layout.width < 16 || float.IsNaN(layout.height) || layout.height<16)
+				return;
+			_linePaint.Color = resolvedStyle.color.ToSKColor();
+			_surface?.Dispose();
+			_canvas?.Dispose();
+			_info = new SKImageInfo((int)layout.width, (int)layout.height);
+			_info.AlphaType = SKAlphaType.Premul;
+			
+			_surface = SKSurface.Create(_info);
+			_canvas = _surface.Canvas;
+			_rect = new Rect(0, 0, layout.width, layout.height);
+			Rebuild();
+		}
+		private void Rebuild()
+		{
+			if (_canvas is null) return;
+			
+			_canvas.Clear(resolvedStyle.backgroundColor.ToSKColor());
+			DoubleBuffer<Vector2> buffer = new();
+			
+			_linePaint.StrokeWidth = 4;
+			
+			foreach (var pos in _points)
+			{
+				if (pos == default)
+				{
+					buffer.Clear();
+				}
+				else
+				{
+					if (buffer.TryGetRelease(out var previousPoint))
+					{
+						_canvas.DrawLine(previousPoint.x, previousPoint.y, pos.x, pos.y, _linePaint);
+					}
+					buffer.Release(pos);
+				}
+			}
+			var texture = _info.ToTexture2D(_surface);
+			
+			
+			style.backgroundImage = texture;
+		}
+		public string Base64 => _surface?.GetBase64();
+		public byte[] Bytes => _surface?.GetBytes();
+	}
+}
+

Src/Unity/Scripts/UX/Painter/SkiaPainter.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 380b69a479ae4d546a730e8c8ca136e0
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: