基本信息

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   源码介绍

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实现3D图片墙功能

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Media.Media3D;
using System.Windows.Threading;
using System.IO;
using System.Security;

namespace WPFDemo
{
    public class FlipTile3D : WrapperElement<Viewport3D>
    {
        public FlipTile3D()
            : base(new Viewport3D())
        {

            Dispatcher.BeginInvoke(DispatcherPriority.ApplicationIdle, new Action(setup3D));

            m_listener.Rendering = tick;

            this.Unloaded = delegate(object sender, RoutedEventArgs e)
            {
                m_listener.StopListening();
            };
        }


        #region render/layout overrides

        protected override void OnRender(System.Windows.Media.DrawingContext drawingContext)
        {
            base.OnRender(drawingContext);
            drawingContext.DrawRectangle(Brushes.Transparent, null, new Rect(this.RenderSize));
        }

        #endregion

        #region mouse overrides
        protected override void OnMouseMove(System.Windows.Input.MouseEventArgs e)
        {
            _lastMouse = e.GetPosition(this);
        }
        protected override void OnMouseLeave(MouseEventArgs e)
        {
            _lastMouse = new Point(double.NaN, double.NaN);
        }
        protected override void OnMouseDown(MouseButtonEventArgs e)
        {
            _isFlipped = !_isFlipped;
            if (_isFlipped)
            {
                setClickedItem(e.GetPosition(this));
            }
        }


        #endregion

        #region private methods

        private void setClickedItem(Point point)
        {
            //move point to center
            point -= (new Vector(this.ActualWidth / 2, this.ActualHeight / 2));

            //flip it
            point.Y *= -1;

            //scale it to 1x1 dimentions
            double scale = Math.Min(this.ActualHeight, this.ActualWidth) / 2;
            point = (Point)(((Vector)point) / scale);

            //set it up so that bottomLeft = 0,0 & topRight = 1,1 (positive Y is up)
            point = (Point)(((Vector)point new Vector(1, 1)) * .5);

            //scale up so that the point coordinates align w/ the x/y scale
            point.Y *= c_yCount;
            point.X *= c_xCount;

            //now we have the indicies of the x & y of the tile clicked
            int yIndex = (int)Math.Floor(point.Y);
            int xIndex = (int)Math.Floor(point.X);

            int tileIndex = yIndex * c_xCount xIndex;

            _backMaterial.Brush = _tiles[tileIndex].DiffuseMaterial.Brush;
        }

        private void setup3D()
        {

            //perf improvement. Clipping in 3D is expensive. Avoid if you can!
            WrappedElement.ClipToBounds = false;

            PerspectiveCamera camera = new PerspectiveCamera(
                new Point3D(0, 0, 3.73), //position
                new Vector3D(0, 0, -1), //lookDirection
                new Vector3D(0, 1, 0), //upDirection
                30 //FOV
                );

            WrappedElement.Camera = camera;

            Model3DGroup everything = new Model3DGroup();

            Model3DGroup lights = new Model3DGroup();
            DirectionalLight whiteLight = new DirectionalLight(Colors.White, new Vector3D(0, 0, -1));
            lights.Children.Add(whiteLight);

            everything.Children.Add(lights);

            ModelVisual3D model = new ModelVisual3D();

            double tileSizeX = 2.0 / c_xCount;
            double startX = -((double)c_xCount) / 2 * tileSizeX tileSizeX / 2;
            double startY = -((double)c_yCount) / 2 * tileSizeX tileSizeX / 2;

            int index;

            Size tileTextureSize = new Size(1.0 / c_xCount, 1.0 / c_yCount);

            //so, tiles are numbers, left-to-right (ascending x), bottom-to-top (ascending y)
            for (int y = 0; y < c_yCount; y )
            {
                for (int x = 0; x < c_xCount; x )
                {
                    index = y * c_xCount x;

                    Rect backTextureCoordinates = new Rect(
                        x * tileTextureSize.Width,

                        // this will give you a headache. Exists since we are going 
                        // from bottom bottomLeft of 3D space (negative Y is down), 
                        // but texture coor are negative Y is up
                        1 - y * tileTextureSize.Height - tileTextureSize.Height,

                        tileTextureSize.Width, tileTextureSize.Height);

                    _tiles[index] = new TileData();
                    _tiles[index].Setup3DItem(
                        everything,
                        getMaterial(index),
                        new Size(tileSizeX, tileSizeX),
                        new Point(startX x * tileSizeX, startY y * tileSizeX),
                        _backMaterial,
                        backTextureCoordinates);
                }
            }

            model.Content = everything;

            WrappedElement.Children.Add(model);

            //start the per-frame tick for the physics
            m_listener.StartListening();
        }


        private void tick(object sender, EventArgs e)
        {
            Vector mouseFixed = fixMouse(_lastMouse, this.RenderSize);
            for (int i = 0; i < _tiles.Length; i )
            {
                //TODO: unwire Render event if nothing happens
                _tiles[i].TickData(mouseFixed, _isFlipped);
            }
        }

        private static Vector fixMouse(Point mouse, Size size)
        {

            Debug.Assert(size.Width >= 0 && size.Height >= 0);
            double scale = Math.Max(size.Width, size.Height) / 2;

            // Translate y going down to y going up
            mouse.Y = -mouse.Y size.Height;

            mouse.Y -= size.Height / 2;
            mouse.X -= size.Width / 2;

            Vector v = new Vector(mouse.X, mouse.Y);

            v /= scale;

            return v;
        }


        #endregion

        #region Implementation

        private DiffuseMaterial getMaterial(int index)
        {
            return _materials[index % _materials.Count];
        }

        private readonly IList<DiffuseMaterial> _materials = GetSamplePictures("Picture");

        private static IList<DiffuseMaterial> GetSamplePictures(string Path)
        {
            IList<DiffuseMaterial> materials;
            IList<string> files = null;
            if (!string.IsNullOrEmpty(Path))
            {
                files = new List<string>();
                try
                {
                    DirectoryInfo di = new DirectoryInfo(Path);
                    if (di.Exists)
                    {
                        foreach (FileInfo fileInfo in di.GetFiles("*.jpg"))
                        {
                            files.Add(fileInfo.FullName);
                            if (files.Count > 50)
                                break;
                        }
                    }
                }
                catch (IOException) { }
                catch (ArgumentException) { }
                catch (SecurityException) { }
            }
            if (files.Count > 0)
            {
                materials = new List<DiffuseMaterial>();

                foreach (string file in files)
                {
                    Uri uri = new Uri(file);

                    BitmapImage bitmapImage = new BitmapImage();
                    bitmapImage.BeginInit();
                    bitmapImage.UriSource = uri;
                    bitmapImage.DecodePixelWidth = 320;
                    bitmapImage.DecodePixelHeight = 240;
                    bitmapImage.EndInit();

                    bitmapImage.Freeze();

                    ImageBrush imageBrush = new ImageBrush(bitmapImage);
                    imageBrush.Stretch = Stretch.UniformToFill;
                    imageBrush.ViewportUnits = BrushMappingMode.Absolute;
                    imageBrush.Freeze();

                    DiffuseMaterial diffuseMaterial = new DiffuseMaterial(imageBrush);
                    materials.Add(diffuseMaterial);
                }
            }
            else
            {
                Brush[] brushes = new Brush[] { 
                    Brushes.LightBlue, 
                    Brushes.Pink, 
                    Brushes.LightGray, 
                    Brushes.Yellow, 
                    Brushes.Orange, 
                    Brushes.LightGreen };

                DiffuseMaterial[] materialsArray =
                    brushes.Select(brush => new DiffuseMaterial(brush)).ToArray();

                materials = materialsArray;
            }
            return materials;
        }

        private Point _lastMouse = new Point(double.NaN, double.NaN);
        private bool _isFlipped;

        private readonly TileData[] _tiles = new TileData[c_xCount * c_yCount];
        private readonly DiffuseMaterial _backMaterial = new DiffuseMaterial();
        private readonly CompositionTargetRenderingListener m_listener =
            new CompositionTargetRenderingListener();

        private const int c_xCount = 7, c_yCount = 7;

        #endregion

    }

}