XplorePlane/XP.Camera/Calibration/Controls/ChessboardCalibrationControl.xaml.cs

using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using XP.Camera.Calibration.ViewModels;

namespace XP.Camera.Calibration.Controls;

public partial class ChessboardCalibrationControl : UserControl
{
    private ChessboardCalibrationViewModel? _viewModel;

    public ChessboardCalibrationControl()
    {
        InitializeComponent();
        Loaded += ChessboardCalibrationControl_Loaded;
    }

    private void ChessboardCalibrationControl_Loaded(object sender, RoutedEventArgs e)
    {
        if (DataContext is ChessboardCalibrationViewModel viewModel)
        {
            _viewModel = viewModel;

            _viewModel.ImageLoadedRequested += (s, e) =>
            {
                imageCanvas.ReferenceImage = _viewModel.ImageSource;
            };

            _viewModel.ImageClearedRequested += (s, e) =>
            {
                imageCanvas.ReferenceImage = null;
            };

            imageCanvas.CanvasMouseWheel += ImageCanvas_MouseWheel;
        }
    }

    private void ImageCanvas_MouseWheel(object? sender, MouseWheelEventArgs e)
    {
        if (_viewModel?.ImageSource == null) return;

        double zoom = e.Delta > 0 ? 1.1 : 0.9;
        imageCanvas.ZoomScale *= zoom;
        imageCanvas.ZoomScale = Math.Max(0.1, Math.Min(imageCanvas.ZoomScale, 10));
    }
}