测试自定义的橡皮擦控件

Author: lindexi

demo/AvaloniaInkCanvasDemo/Views/ErasingView/CustomEraserView.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Layout;
+using Avalonia.Media;
+
+using DotNetCampus.Inking.Erasing;
+
+namespace AvaloniaInkCanvasDemo.Views.ErasingView;
+
+internal class CustomEraserView : Control, IEraserView
+{
+    public CustomEraserView()
+    {
+        Path1 = Geometry.Parse("M0,5.0093855C0,2.24277828,2.2303666,0,5.00443555,0L24.9955644,0C27.7594379,0,30,2.23861485,30,4.99982044L30,17.9121669C30,20.6734914,30,25.1514578,30,27.9102984L30,40.0016889C30,42.7621799,27.7696334,45,24.9955644,45L5.00443555,45C2.24056212,45,0,42.768443,0,39.9906145L0,5.0093855z");
+        Path1FillBrush = new SolidColorBrush(new Color(0x33, 0, 0, 0));
+
+        //Path2 = Geometry.Parse("M20,29.1666667L20,16.1666667C20,15.3382395 19.3284271,14.6666667 18.5,14.6666667 17.6715729,14.6666667 17,15.3382395 17,16.1666667L17,29.1666667C17,29.9950938 17.6715729,30.6666667 18.5,30.6666667 19.3284271,30.6666667 20,29.9950938 20,29.1666667z M13,29.1666667L13,16.1666667C13,15.3382395 12.3284271,14.6666667 11.5,14.6666667 10.6715729,14.6666667 10,15.3382395 10,16.1666667L10,29.1666667C10,29.9950938 10.6715729,30.6666667 11.5,30.6666667 12.3284271,30.6666667 13,29.9950938 13,29.1666667z");
+        //Path2FillBrush = new SolidColorBrush(new Color(0x26, 0, 0, 0));
+
+        Path3FillBrush = new SolidColorBrush(new Color(0xFF, 0xF2, 0xEE, 0xEB));
+
+        var bounds = Path1.Bounds;//.Union(Path2.Bounds);
+        Width = bounds.Width;
+        Height = bounds.Height;
+
+        HorizontalAlignment = HorizontalAlignment.Left;
+        VerticalAlignment = VerticalAlignment.Top;
+        IsHitTestVisible = false;
+
+        var translateTransform = new TranslateTransform();
+        _translateTransform = translateTransform;
+        var scaleTransform = new ScaleTransform();
+        _scaleTransform = scaleTransform;
+        var transformGroup = new TransformGroup();
+        transformGroup.Children.Add(_scaleTransform);
+        transformGroup.Children.Add(_translateTransform);
+        RenderTransform = transformGroup;
+
+        _currentEraserSize = new Size(Width, Height);
+    }
+
+    private readonly TranslateTransform _translateTransform;
+
+    private readonly ScaleTransform _scaleTransform;
+
+    private Geometry Path1 { get; }
+    private IBrush Path1FillBrush { get; }
+
+    //private Geometry Path2 { get; }
+    //private IBrush Path2FillBrush { get; }
+
+    private IBrush Path3FillBrush { get; }
+
+    private Size _currentEraserSize;
+
+    public void Move(Point position)
+    {
+        _translateTransform.X = position.X - _currentEraserSize.Width / 2;
+        _translateTransform.Y = position.Y - _currentEraserSize.Height / 2;
+    }
+
+    public void SetEraserSize(Size size)
+    {
+        _scaleTransform.ScaleX = size.Width / Width;
+        _scaleTransform.ScaleY = size.Height / Height;
+
+        _currentEraserSize = size;
+    }
+
+    public override void Render(DrawingContext context)
+    {
+        context.DrawGeometry(Path1FillBrush, null, Path1);
+        //context.DrawGeometry(Path2FillBrush, null, Path2);
+        context.DrawRectangle(Path3FillBrush, null, new RoundedRect(new Rect(1, 1, 28, 43), 4));
+    }
+}

demo/AvaloniaInkCanvasDemo/Views/MainView.axaml.cs

@@ -1,7 +1,9 @@
 using Avalonia.Controls;
 using Avalonia.Interactivity;
 using Avalonia.Skia;
+using AvaloniaInkCanvasDemo.Views.ErasingView;
 using DotNetCampus.Inking;
+using DotNetCampus.Inking.Erasing;
 using DotNetCampus.Inking.StrokeRenderers.WpfForSkiaInkStrokeRenderers;
 using SkiaSharp;
 
@@ -12,6 +14,8 @@ public partial class MainView : UserControl
     public MainView()
     {
         InitializeComponent();
+        var settings = InkCanvas.AvaloniaSkiaInkCanvas.Settings;
+        settings.EraserViewCreator = new DelegateEraserViewCreator(() => new CustomEraserView());
     }
 
     private void PenModeButton_OnClick(object? sender, RoutedEventArgs e)