/**//// <summary>
        /// 依照InteractiveVisual3D在列表中的序号来变换其位置等
        /// </summary>
        /// <param name="index">在列表中的序号</param>
        /// <param name="midIndex">列表中被作为中间项的序号</param>
        private void GetTransformOfInteractiveVisual3D(int index, double midIndex, out double angle, out double offsetX, out double offsetZ)
        {
            double disToMidIndex = index - midIndex;


            //旋转,两翼的图片各旋转一定的度数
            angle = 0;
            if (disToMidIndex < 0)
            {
                angle = this.ModelAngle;//左边的旋转N度
            }
            else if (disToMidIndex > 0)
            {
                angle = (-this.ModelAngle);//右边的旋转-N度
            }
            
         

            //平移,两翼的图片逐渐向X轴负和正两个方向展开
            offsetX = 0;//中间的不平移
            if (Math.Abs(disToMidIndex) <= 1)
            {
                offsetX = disToMidIndex * this.MidModelDistance;
            }
            else if (disToMidIndex != 0)
            {
                offsetX = disToMidIndex * this.XDistanceBetweenModels + (disToMidIndex > 0 ? this.MidModelDistance : -this.MidModelDistance);
            }
            

            //两翼的图片逐渐向Z轴负方向移动一点,造成中间突出(离观众较近的效果)
            offsetZ = Math.Abs(disToMidIndex) * -this.ZDistanceBetweenModels;
          
        }

  /**//// <summary>
        /// 重新布局3D内容
        /// </summary>
        private void ReLayoutInteractiveVisual3D()
        {
            int j=0;
            for (int i = 0; i < this.viewport3D.Children.Count; i++)
            {
                InteractiveVisual3D iv3d =  this.viewport3D.Children[i] as InteractiveVisual3D;
                if(iv3d != null)
                {
                    double angle = 0;
                    double offsetX = 0;
                    double offsetZ = 0;
                    this.GetTransformOfInteractiveVisual3D(j++, this.CurrentMidIndex,out angle,out offsetX,out offsetZ);


                    NameScope.SetNameScope(this, new NameScope());
                    this.RegisterName("iv3d", iv3d);
                    Duration time = new Duration(TimeSpan.FromSeconds(0.3));

                    DoubleAnimation angleAnimation = new DoubleAnimation(angle, time);
                    DoubleAnimation xAnimation = new DoubleAnimation(offsetX, time);
                    DoubleAnimation zAnimation = new DoubleAnimation(offsetZ, time);

                    Storyboard story = new Storyboard();
                    story.Children.Add(angleAnimation);
                    story.Children.Add(xAnimation);
                    story.Children.Add(zAnimation);

                    Storyboard.SetTargetName(angleAnimation, "iv3d");
                    Storyboard.SetTargetName(xAnimation, "iv3d");
                    Storyboard.SetTargetName(zAnimation, "iv3d");

                    Storyboard.SetTargetProperty(
                        angleAnimation,
                        new PropertyPath("(ModelVisual3D.Transform).(Transform3DGroup.Children)[0].(RotateTransform3D.Rotation).(AxisAngleRotation3D.Angle)"));

                    Storyboard.SetTargetProperty(
                        xAnimation,
                        new PropertyPath("(ModelVisual3D.Transform).(Transform3DGroup.Children)[1].(TranslateTransform3D.OffsetX)"));
                    Storyboard.SetTargetProperty(
                        zAnimation,
                        new PropertyPath("(ModelVisual3D.Transform).(Transform3DGroup.Children)[1].(TranslateTransform3D.OffsetZ)"));

                    story.Begin(this);

                }
            }
        }