滚轮缩放效果

        public void MouseWheelEventHandler(object sender, MouseWheelEventArgs e)

        {

            double oldScalX = ((ScaleTransform)canvas.RenderTransform).ScaleX;

            double oldScalY = ((ScaleTransform)canvas.RenderTransform).ScaleY;



            var storyBoard = new Storyboard();

            //var group = new TransformGroup();

            //var scale = new ScaleTransform(1.5, 1.5);

            //group.Children.Add(scale);

            //group.Children.Add(new TranslateTransform(300, 300));

            //canvas.RenderTransform = group;



            RegisterName("MainCanvas", canvas);



            var growAnimation = new DoubleAnimation();

            QuinticEase ee = new QuinticEase();

            ee.EasingMode = EasingMode.EaseOut;

            growAnimation.EasingFunction = ee;



            growAnimation.From = oldScalX;

            if (e.Delta > 0)

            {

                growAnimation.To = oldScalX + 0.2;

            }

            else

            {

                growAnimation.To = oldScalX - 0.2;

            }

            storyBoard.Children.Add(growAnimation);



            var growAnimation2 = new DoubleAnimation();

            QuinticEase ee2 = new QuinticEase();

            ee2.EasingMode = EasingMode.EaseOut;

            growAnimation2.EasingFunction = ee2;

            growAnimation2.From = oldScalY;

            if (e.Delta > 0)

            {

                growAnimation2.To = oldScalY + 0.2;

            }

            else

            {

                growAnimation2.To = oldScalY - 0.2;

            }

            storyBoard.Children.Add(growAnimation2);





            Storyboard.SetTargetProperty(growAnimation, new PropertyPath("RenderTransform.ScaleX"));

            Storyboard.SetTargetProperty(growAnimation2, new PropertyPath("RenderTransform.ScaleY"));

            Storyboard.SetTargetName(growAnimation, "MainCanvas");

            Storyboard.SetTargetName(growAnimation2, "MainCanvas");

            storyBoard.Begin(this);





        }

添加事件代码

        private void UserControl_Loaded_1(object sender, RoutedEventArgs e)

        {

            Window.GetWindow(this).MouseWheel += MouseWheelEventHandler;

        }