基于WPF实现3D画廊动画效果的示例代码

下面是一个基于WPF实现3D画廊动画效果的示例代码：

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Media3D;
namespace WPF3DGallery
{
    public partial class MainWindow : Window
    {
        private const double AngleIncrement = 30;
        private const double ScaleIncrement = 0.1;
        private PerspectiveCamera _camera;
        private Model3DGroup _modelGroup;
        private Point _lastMousePosition;
        public MainWindow()
        {
            InitializeComponent();
            CreateScene();
        }
        private void CreateScene()
        {
            // 创建3D场景
            _modelGroup = new Model3DGroup();
            _modelGroup.Children.Add(CreateCubeModel(new Point3D(-100, 0, 0), Colors.Red));
            _modelGroup.Children.Add(CreateCubeModel(new Point3D(0, 0, 0), Colors.Green));
            _modelGroup.Children.Add(CreateCubeModel(new Point3D(100, 0, 0), Colors.Blue));
            // 创建灯光
            var directionalLight = new DirectionalLight(Colors.White, new Vector3D(0, -0.5, -1));
            _modelGroup.Children.Add(directionalLight);
            // 设置相机
            _camera = new PerspectiveCamera(new Point3D(0, 0, 200), new Vector3D(0, 0, -1), new Vector3D(0, 1, 0));
            // 将模型和相机添加到Viewport3D中
            var viewport = new Viewport3D();
            viewport.Camera = _camera;
            viewport.Children.Add(_modelGroup);
            // 设置Viewport3D为窗口的内容
            Content = viewport;
        }
        private GeometryModel3D CreateCubeModel(Point3D position, Color color)
        {
            var mesh = new MeshGeometry3D();
            mesh.Positions.Add(new Point3D(-50, -50, 50));
            mesh.Positions.Add(new Point3D(50, -50, 50));
            mesh.Positions.Add(new Point3D(-50, 50, 50));
            mesh.Positions.Add(new Point3D(50, 50, 50));
            mesh.Positions.Add(new Point3D(-50, -50, -50));
            mesh.Positions.Add(new Point3D(50, -50, -50));
            mesh.Positions.Add(new Point3D(-50, 50, -50));
            mesh.Positions.Add(new Point3D(50, 50, -50));
            mesh.TriangleIndices.Add(0);
            mesh.TriangleIndices.Add(1);
            mesh.TriangleIndices.Add(2);
            mesh.TriangleIndices.Add(2);
            mesh.TriangleIndices.Add(1);
            mesh.TriangleIndices.Add(3);
            mesh.TriangleIndices.Add(4);
            mesh.TriangleIndices.Add(5);
            mesh.TriangleIndices.Add(6);
            mesh.TriangleIndices.Add(6);
            mesh.TriangleIndices.Add(5);
            mesh.TriangleIndices.Add(7);
            mesh.TriangleIndices.Add(2);
            mesh.TriangleIndices.Add(3);
            mesh.TriangleIndices.Add(6);
            mesh.TriangleIndices.Add(6);
            mesh.TriangleIndices.Add(3);
            mesh.TriangleIndices.Add(7);
            mesh.TriangleIndices.Add(0);
            mesh.TriangleIndices.Add(2);
            mesh.TriangleIndices.Add(4);
            mesh.TriangleIndices.Add(4);
            mesh.TriangleIndices.Add(2);
            mesh.TriangleIndices.Add(6);
            mesh.TriangleIndices.Add(1);
            mesh.TriangleIndices.Add(0);
            mesh.TriangleIndices.Add(5);
            mesh.TriangleIndices.Add(5);
            mesh.TriangleIndices.Add(0);
            mesh.TriangleIndices.Add(4);
            mesh.TriangleIndices.Add(1);
            mesh.TriangleIndices.Add(5);
            mesh.TriangleIndices.Add(3);
            mesh.TriangleIndices.Add(3);
            mesh.TriangleIndices.Add(5);
            mesh.TriangleIndices.Add(7);
            var material = new DiffuseMaterial(new SolidColorBrush(color));
            return new GeometryModel3D(mesh, material)
            {
                Transform = new TranslateTransform3D(position.X, position.Y, position.Z)
            };
        }
        protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
        {
            _lastMousePosition = e.GetPosition(this);
            CaptureMouse();
        }
        protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
        {
            ReleaseMouseCapture