WPF编程，通过Double Animation动态旋转控件的一种方法。

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?1、控件旋转，可直接调用。需要将控件的名称，旋转的角度，时间等参数传进去。

        /// <summary>
        /// 控件绕中心旋转动画
        /// </summary>
        /// <param name="element">控件名</param>
        /// <param name="anglefrom">开始角度</param>
        /// <param name="angleto">结束角度</param>
        /// <param name="power">过渡强度1为不用过渡</param>
        /// <param name="time">持续时间，例如3秒： TimeSpan(0,0,3) </param>
        public void AngleEasingAnimationShow(UIElement element, double anglefrom, double angleto,int power,TimeSpan time)
        {
            RotateTransform angle = new RotateTransform();  //旋转
            element.RenderTransform = angle;
            //定义圆心位置
            element.RenderTransformOrigin = new System.Windows.Point(0.5, 0.5);
            //定义过渡动画,power为过度的强度
            EasingFunctionBase easeFunction = new PowerEase()
            {
                EasingMode = EasingMode.EaseInOut,
                Power = power
            };

            DoubleAnimation angleAnimation = new DoubleAnimation()
            {
                From = anglefrom,                                   //起始值
                To = angleto,                                     //结束值
                FillBehavior = FillBehavior.HoldEnd,
                Duration = time,                                 //动画播放时间
            };
            angle.BeginAnimation(RotateTransform.AngleProperty, angleAnimation);
        }

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