lotsapaths.mainwindow.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.Shapes;
using Avalonia.Input;
using Avalonia.Markup.Xaml;
using Avalonia.Media;

namespace LotsaPaths
{
    public class MainWindow : Window
    {
        private readonly Canvas canvas;
        private double zoom = 1;

        public MainWindow()
        {
            InitializeComponent();

            canvas = new Canvas();

            for (var i = 0; i < 1024; ++i)
            {
                var path = new Path
                {
                    Data = StreamGeometry.Parse(@"M 320.000 340.000
                                                L 340.000 354.641
                                                L 337.321 330.000
                                                L 360.000 320.000
                                                L 337.321 310.000
                                                L 340.000 285.359
                                                L 320.000 300.000
                                                L 300.000 285.359
                                                L 302.679 310.000
                                                L 280.000 320.000
                                                L 302.679 330.000
                                                L 300.000 354.641
                                                z"),
                    Stroke = Brushes.Black,
                    StrokeThickness = 2,
                    Width = 32,
                    Height = 32,
                    Stretch = Stretch.Fill,
                };

                canvas.Children.Add(path);
                Canvas.SetLeft(path, (i % 32) * 32);
                Canvas.SetTop(path, ((int)(i / 32)) * 32);
            }

            Content = canvas;
        }

        protected override void OnPointerWheelChanged(PointerWheelEventArgs e)
        {
            base.OnPointerWheelChanged(e);

            if (canvas.RenderTransform is null)
            {
                canvas.RenderTransform = new ScaleTransform();
            }

            zoom += e.Delta.Y / 8;

            var t = (ScaleTransform)canvas.RenderTransform;
            t.ScaleX = t.ScaleY = zoom;
        }

        private void InitializeComponent()
        {
            AvaloniaXamlLoader.Load(this);
        }
    }
}