deepzoom的使用

• 源于遥感影像的金字塔显示方式
• 提供了与高分辩率图像进行交互的能力
• 可以快速绽放图像而不影响应用的性能
• 加载或平衡图像时可以光滑过渡，Spring Animatio

n可做的图像分类有两种，为如下：

• Single　　单一图片
• Collection　　系列图片

 制作 DeepZoom 图像需要到微软的下载网站下载DeepZoomComposer 工具

MultiScaleImage 的使用

• 打开、放大和平移多分辩率图像
• 快速任意缩放展示大图像、高分辩率图像的应用程序
• 属性　　Source -Web URI　　UseSprings-Spring animation      ViewportOrigin -中心点　　ViewportWidth -缩放级别

　　下面是一张对中心点和缩放级别的效果：

　　事件

• ImageFailed　　下载超时、打开错误时触发
• ImageOpenFaild　　图像打开失败触发
• ImageOpenSuccesded　　图像打开成功后触发

代码如下：

    public partial class Page : UserControl
    {
        Point lastMousePos = new Point();
        Point lastMouseLogicalPos = new Point();
        Point lastMouseViewPort = new Point();
        bool duringDrag = false;
        double zoom = 1;
        double minzoom = 0.001;
        bool duringOpen = false;
 
        public Page()
        {
            InitializeComponent();
        }
 
        /// <summary>
        /// 鼠标滚轮缩放
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void ZoomImage_MouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
        {
            double newzoom = zoom;
            if (e.Delta > 0)
                newzoom /= 1.3;
            else
                newzoom *= 1.3;
            Point logicalPoint = this.ZoomImage.ElementToLogicalPoint(this.lastMousePos);
 
            this.ZoomImage.ZoomAboutLogicalPoint(zoom / newzoom, logicalPoint.X, logicalPoint.Y);
            zoom = newzoom;
            e.Handled = true;
        }
 
        /// <summary>
        /// 原始大小
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Home_Click(object sender, MouseButtonEventArgs e)
        {
            this.ZoomImage.ViewportOrigin = new Point(0, 0);
            this.ZoomImage.ViewportWidth = 1;
            zoom = 1;
        }
 
        /// <summary>
        /// 放大
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ZoomIn_Click(object sender, MouseButtonEventArgs e)
        {
            double newzoom = zoom / 1.3;
            if (newzoom < minzoom) { newzoom = minzoom; }
            Point logicalPoint = this.ZoomImage.ElementToLogicalPoint(new Point(this.ActualWidth / 2, this.ActualHeight / 2));
            this.ZoomImage.ZoomAboutLogicalPoint(zoom / newzoom, logicalPoint.X, logicalPoint.Y);
            zoom = newzoom;
        }
 
        /// <summary>
        /// 缩小
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ZoomOut_Click(object sender, MouseButtonEventArgs e)
        {
            double newzoom = zoom * 1.3;
            if (newzoom > 1) { newzoom = 1; }
            Point logicalPoint = this.ZoomImage.ElementToLogicalPoint(new Point(this.ActualWidth / 2, this.ActualHeight / 2));
            this.ZoomImage.ZoomAboutLogicalPoint(zoom / newzoom, logicalPoint.X, logicalPoint.Y);
            zoom = newzoom;
        }
 
        /// <summary>
        /// 鼠标按下
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ZoomImage_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            //获取按下时图像坐标位置
            lastMouseLogicalPos = e.GetPosition(this.ZoomImage);
            //获取视区中心点位置     
            lastMouseViewPort = this.ZoomImage.ViewportOrigin;
            duringDrag = true;
        }
 
        /// <summary>
        /// 鼠标抬起
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ZoomImage_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            duringDrag = false;
            this.ZoomImage.UseSprings = true;
        }
 
        /// <summary>
        /// 鼠标移动
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ZoomImage_MouseMove(object sender, MouseEventArgs e)
        {
            if (duringDrag)
            {
                Point newPoint = lastMouseViewPort;
                Point thisMouseLogicalPos = e.GetPosition(this.ZoomImage);
                //将最后一次的坐标位置和控件的真实宽度和缩放级别进行计算
                newPoint.X += (lastMouseLogicalPos.X - thisMouseLogicalPos.X) / this.ZoomImage.ActualWidth * this.ZoomImage.ViewportWidth;
                newPoint.Y += (lastMouseLogicalPos.Y - thisMouseLogicalPos.Y) / this.ZoomImage.ActualWidth * this.ZoomImage.ViewportWidth;
                //这样的计算将产生平移的效果
                this.ZoomImage.ViewportOrigin = newPoint;
            }
        }
 
        /// <summary>
        /// 图像加载成功
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ZoomImage_ImageOpenSucceeded(object sender, RoutedEventArgs e)
        {
            duringOpen = true;
 
        }
 
        /// <summary>
        /// 图像加载完成
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ZoomImage_MotionFinished(object sender, RoutedEventArgs e)
        {
            if (duringOpen)
            {
                duringOpen = false;
 
                // zoom out a tad bit.
                this.ZoomImage.ViewportOrigin = new Point(-0.4, -0.1);
                this.ZoomImage.ViewportWidth = 1.8;
            }
        }
 
    }
这里参考了以下文章，关于WP7http://www.cnblogs.com/TerryBlog/archive/2011/01/27/1946536.html