Silverlight三维透视+倒影效果

知识概要：

1.使用2D内容创建3D体验，了解图像的PlaneProjection属性，具体内容读者自己查看文档。

2.Silverlight图形图形的变换效果的使用。

最终的效果如下图：

马上开始动手：

首先准备五张图片：直接在xaml中进行导入：

代码

< Grid x:Name ="LayoutRoot" Background ="Black" > //背景色通过background属性设为黑色
< Image Source ="1.jpg" Stretch ="Fill" Width ="192" Height ="276" />
< Image Source ="2.jpg" Stretch ="Fill" Width ="192" Height ="276" />
< Image Source ="3.jpg" Stretch ="Fill" Width ="192" Height ="276" />
< Image Source ="4.jpg" Stretch ="Fill" Width ="192" Height ="276" />
< Image Source ="5.jpg" Stretch ="Fill" Width ="192" Height ="276" />
</ Grid >

其中的Stretch属性设置为Fill;

知识拓展：关于Stretch属性的四个值------------------------->Start：

----------------------------------->1.None: 不对图像进行拉伸，使得填充完规定的大小尺寸

----------------------------------->2.Uniform:按比例进行拉伸，直到有一边达到规定的尺寸，其余部分不会被填充

----------------------------------->3.UniformToFill:按比例进行拉伸，直到所以的边都满足规定的尺寸。超出大小部分会被剪裁。

----------------------------------->4.Fill：不按比例拉伸，完全填充规定的尺寸

------END

至此，你已经成功让5张漂亮的图片在屏幕上显示了。

接着，我们试着让它们出现3D透视效果：

代码

< Image Source ="1.jpg" Stretch ="Fill" Width ="192" Height ="276" >
      < Image.Projection >
        < PlaneProjection RotationY ="-70" GlobalOffsetX ="-230" GlobalOffsetZ ="-100" />
      </ Image.Projection >
</ Image >
< Image Source ="2.jpg" Stretch ="Fill" Width ="192" Height ="276" >
      < Image.Projection >
        < PlaneProjection RotationY ="-70" GlobalOffsetX ="-155" GlobalOffsetZ ="-100" />
      </ Image.Projection >
</ Image >
< Image Source ="3.jpg" Stretch ="Fill" Width ="192" Height ="276" >
      < Image.Projection >
        < PlaneProjection RotationY ="70" GlobalOffsetX ="230" GlobalOffsetZ ="-100" />
      </ Image.Projection >
</ Image >
< Image Source ="4.jpg" Stretch ="Fill" Width ="192" Height ="276" >
      < Image.Projection >
        < PlaneProjection RotationY ="70" GlobalOffsetX ="155" GlobalOffsetZ ="-100" />
      </ Image.Projection >
</ Image >
< Image Source ="5.jpg" Stretch ="Fill" Width ="192" Height ="276" />

在上述代码中，除了第五张图片不对他进行变化（因为他是放在中间的图片），其它的都通过 Projection的PlaneProjection属性进行设置。

PlaneProjection提供的一套属性使得其中的element具有在3维空间中的形状。其中RotationY是对element在三维坐标中沿着Y轴旋转一定的度数，这里第一张图片旋转-70 ；GlobalOffsetX是在X轴坐标上的偏移。例如：GlobalOffsetX=“-230”，就表示在X负半轴上离原点230个单位处。GlobalOffsetZ与GlobalOffsetX一样，只不过它是在Z轴（垂直于屏幕）的偏移。我们让图像在Z轴向屏幕里面移动100个单位。

到此，我们已经让图片具有3D效果。

接下来，就开始设置倒影：

我们以图片一为例：

代码

             < Image Source ="1.jpg" Stretch ="Fill" Width ="192" Height ="276" >
             < Image.Projection >
                 < PlaneProjection RotationY ="-70" GlobalOffsetX ="-230" GlobalOffsetZ ="-100" />
             </ Image.Projection >
         </ Image >
         < Image Source ="1.jpg" Stretch ="Fill" Width ="192" Height ="276" Opacity ="0.2" >
             < Image.RenderTransform >
                 < TransformGroup >
                     < ScaleTransform ScaleY ="-1" />
                     < TranslateTransform Y ="470" />
                     < SkewTransform AngleY ="-25" />
                 </ TransformGroup >
             </ Image.RenderTransform >
                 < Image.Projection >
                 < PlaneProjection RotationY ="-70" GlobalOffsetX ="-230" GlobalOffsetZ ="-100" />
             </ Image.Projection >
             < Image.OpacityMask >
                 < LinearGradientBrush StartPoint ="0.5,0.0" EndPoint ="0.5,1.0" >
                     < GradientStop Offset ="0.0" Color ="#00000000" />
                     < GradientStop Offset ="1.0"   Color ="#FF000000" />
                 </ LinearGradientBrush >
             </ Image.OpacityMask >
         </ Image >

A.实现思路很简单：

1.复制图片一

2.沿着X轴翻转

3.进行图片的倾斜变换进行调整

4.制作半遮罩效果

-----------------------------知识延伸：（变换效果)-------------------------

Silverlight中的变换是由Transform类来定义，其中主要包括：

RotateTransform:旋转变换

ScaleTransform：缩放变换

SkewTransform：倾斜变换

TranslateTransform：移动变换

TransformGroup：变换组

MatrixTransform：矩阵变换

（这里不做具体介绍，具体内容及使用方法请查看文档和相关基础书籍）

--------------------------------------------------------------------------------

复制图片：我们采用在原有图片基础上再导入图片一；沿着X轴翻转，使用ScaleTransform属性，使它的ScaleY="-1",这样就使得图片翻转。然后通过TranslateTransform属性的Y属性在y 轴上进行位置的调整，使得图像一的副本位于图

像一下面的合适位置，但是你会发现，由于之前进行了3D透视变化。两图像并没有在同一基准线上，因此要通过SkewTransform进行图像的倾斜变换。

最后制作对倒影图片制作半遮罩效果，通过Image属性的OpcityMask 属性进行设置。在其中，我们放入了一个

LinearGradientBrush线性渐变画刷，通过设置GradientStop属性的Offset以及Color属性，制作出半遮罩效果。

至此，一个简单的三维透视+倒影效果就做好了。

完整的代码：

代码

< Grid x:Name ="LayoutRoot" Background ="Black" >
< Image Source ="1.jpg" Stretch ="Fill" Width ="192" Height ="276" >
             < Image.Projection >
                 < PlaneProjection RotationY ="-70" GlobalOffsetX ="-230" GlobalOffsetZ ="-100" />
             </ Image.Projection >
         </ Image >
         < Image Source ="1.jpg" Stretch ="Fill" Width ="192" Height ="276" Opacity ="0.2" >
             < Image.RenderTransform >
                 < TransformGroup >
                     < ScaleTransform ScaleY ="-1" />
                     < TranslateTransform Y ="470" />
                     < SkewTransform AngleY ="-25" />
                 </ TransformGroup >
             </ Image.RenderTransform >
                 < Image.Projection >
                 < PlaneProjection RotationY ="-70" GlobalOffsetX ="-230" GlobalOffsetZ ="-100" />
             </ Image.Projection >
             < Image.OpacityMask >
                 < LinearGradientBrush StartPoint ="0.5,0.0" EndPoint ="0.5,1.0" >
                     < GradientStop Offset ="0.0" Color ="#00000000" />
                     < GradientStop Offset ="1.0"   Color ="#FF000000" />
                 </ LinearGradientBrush >
             </ Image.OpacityMask >
         </ Image >
         < Image Source ="2.jpg" Stretch ="Fill" Width ="192" Height ="276" >
             < Image.Projection >
                 < PlaneProjection RotationY ="-70" GlobalOffsetX ="-155" GlobalOffsetZ ="-100" />
             </ Image.Projection >
         </ Image >
         < Image Source ="2.jpg" Stretch ="Fill" Width ="192" Height ="276" Opacity ="0.2" >
             < Image.RenderTransform >
                 < TransformGroup >
                     < ScaleTransform ScaleY ="-1" />
                     < TranslateTransform Y ="500" />
                     < SkewTransform AngleY ="-25" />
                 </ TransformGroup >
             </ Image.RenderTransform >
             < Image.Projection >
                 < PlaneProjection RotationY ="-70" GlobalOffsetX ="-155" GlobalOffsetZ ="-100" />
             </ Image.Projection >
             < Image.OpacityMask >
                 < LinearGradientBrush StartPoint ="0.5,0.0" EndPoint ="0.5,1.0" >
                     < GradientStop Offset ="0.0" Color ="#00000000" />
                     < GradientStop Offset ="1.0"   Color ="#FF000000" />
                 </ LinearGradientBrush >
             </ Image.OpacityMask >
         </ Image >
         < Image Source ="3.jpg" Stretch ="Fill" Width ="192" Height ="276" >
             < Image.Projection >
                 < PlaneProjection RotationY ="70" GlobalOffsetX ="230" GlobalOffsetZ ="-100" />
             </ Image.Projection >
         </ Image >
         < Image Source ="3.jpg" Stretch ="Fill" Width ="192" Height ="276" Opacity ="0.2" >
             < Image.RenderTransform >
                 < TransformGroup >
                     < ScaleTransform ScaleY ="-1" />
                     < TranslateTransform Y ="380" />
                     < SkewTransform AngleY ="25" />
                 </ TransformGroup >
             </ Image.RenderTransform >
             < Image.Projection >
                 < PlaneProjection RotationY ="70" GlobalOffsetX ="230" GlobalOffsetZ ="-100" />
             </ Image.Projection >
             < Image.OpacityMask >
                 < LinearGradientBrush StartPoint ="0.5,0.0" EndPoint ="0.5,1.0" >
                     < GradientStop Offset ="0.0" Color ="#00000000" />
                     < GradientStop Offset ="1.0"   Color ="#FF000000" />
                 </ LinearGradientBrush >
             </ Image.OpacityMask >
         </ Image >
         < Image Source ="4.jpg" Stretch ="Fill" Width ="192" Height ="276" >
             < Image.Projection >
                 < PlaneProjection RotationY ="70" GlobalOffsetX ="155" GlobalOffsetZ ="-100" />
             </ Image.Projection >
         </ Image >
       < Image Source ="4.jpg" Stretch ="Fill" Width ="192" Height ="276" Opacity ="0.2" >
             < Image.RenderTransform >
                 < TransformGroup >
                     < ScaleTransform ScaleY ="-1" />
                     < TranslateTransform Y ="380" />
                     < SkewTransform AngleY ="25" />
                 </ TransformGroup >
             </ Image.RenderTransform >
             < Image.Projection >
                 < PlaneProjection RotationY ="70" GlobalOffsetX ="155" GlobalOffsetZ ="-100" />
             </ Image.Projection >
             < Image.OpacityMask >
                 < LinearGradientBrush StartPoint ="0.5,0.0" EndPoint ="0.5,1.0" >
                     < GradientStop Offset ="0.0" Color ="#00000000" />
                     < GradientStop Offset ="1.0"   Color ="#FF000000" />
                 </ LinearGradientBrush >
             </ Image.OpacityMask >
         </ Image >
         < Image Source ="5.jpg" Stretch ="Fill" Width ="192" Height ="276" Opacity =" {0.2} " />

         < Image Source ="5.jpg" Stretch ="Fill" Width ="192" Height ="276" Opacity ="0.2" >
             < Image.RenderTransform >
                 < TransformGroup >
                     < ScaleTransform ScaleY ="-1" />
                     < TranslateTransform Y ="552" />
                 </ TransformGroup >
             </ Image.RenderTransform >
             < Image.OpacityMask >
                 < LinearGradientBrush StartPoint ="0.5,0.0" EndPoint ="0.5,1.0" >
                     < GradientStop Offset ="0.0" Color ="#00000000" />
                     < GradientStop Offset ="1.0" Color ="#FF000000" />
                 </ LinearGradientBrush >
             </ Image.OpacityMask >
         </ Image >
</ Grid >

Silverlight三维透视+倒影效果

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