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   源码介绍

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WPF image 拖拽,缩放和旋转效果，适合新手学习使用。.Net 4 内部支持多点触摸

using System.Windows;
using System.Windows.Input;
using System.Windows.Media;

namespace WpfManipulation
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void image_ManipulationStarting(object sender, ManipulationStartingEventArgs e)
        {
            e.ManipulationContainer = touchPad;

            e.Mode = ManipulationModes.All;
        }

        private void image_ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
        {
            FrameworkElement element = (FrameworkElement)e.Source;
            element.Opacity = 0.5;

            Matrix matrix = ((MatrixTransform)element.RenderTransform).Matrix;

            var deltaManipulation = e.DeltaManipulation;
            
            Point center = new Point(element.ActualWidth / 2, element.ActualHeight / 2);
            center = matrix.Transform(center);

            //matrix.ScaleAt(deltaManipulation.Scale, deltaManipulation.Scale, center.X, center.Y);
            matrix.ScaleAt(deltaManipulation.Scale.X, deltaManipulation.Scale.Y, center.X, center.Y);

           matrix.RotateAt(e.DeltaManipulation.Rotation, center.X, center.Y);

            matrix.Translate(e.DeltaManipulation.Translation.X, e.DeltaManipulation.Translation.Y);

            ((MatrixTransform)element.RenderTransform).Matrix = matrix;

        }

        private void image_ManipulationCompleted(object sender, ManipulationCompletedEventArgs e)
        {
            FrameworkElement element = (FrameworkElement)e.Source;
            element.Opacity = 1;
        }
    }
}