C#如何使用SkiaSharp控件缩放光标位置？

using SkiaSharp;
using SkiaSharp.Views.Forms;
using Xamarin.Forms;

public class MySkiaSharpView : SKCanvasView
{
    private float cursorX = 100;
    private float cursorY = 100;
    private float scale = 1.0f;

    protected override void OnPaintSurface(SKPaintSurfaceEventArgs e)
    {
        base.OnPaintSurface(e);

        SKSurface surface = e.Surface;
        SKCanvas canvas = surface.Canvas;

        // 清空画布
        canvas.Clear(SKColors.White);

        // 创建画笔
        SKPaint paint = new SKPaint
        {
            Color = SKColors.Red,
            IsAntialias = true
        };

        // 绘制光标
        canvas.DrawCircle(cursorX, cursorY, 10 * scale, paint);
    }

    protected override void OnMouseWheel(MouseWheelEventArgs e)
    {
        base.OnMouseWheel(e);

        // 获取鼠标滚轮的缩放值
        float delta = e.Delta > 0 ? 0.1f : -0.1f;

        // 更新缩放比例
        scale += delta;

        // 更新光标位置
        cursorX *= scale;
        cursorY *= scale;

        // 重新绘制控件
        InvalidateSurface();
    }
}

// 在页面中使用SkiaSharp控件
public class MainPage : ContentPage
{
    public MainPage()
    {
        MySkiaSharpView skiaView = new MySkiaSharpView();

        Content = new StackLayout
        {
            Children = { skiaView }
        };
    }
}