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