一、定义缓动动画类

public class AnimationHelper

    {

        Timer animationTimer = new Timer();

        double velocity = 0.0;

        Point location = Point.Empty;

        double force = 0.01; //0.69;

        double drag = 0.8;

        private Control control;

        //private AxShockwaveFlash control;

        private int targetPos=0;

        public AnimationHelper(int interval=5)

        {

            animationTimer.Interval = interval;

            animationTimer.Tick += delegate

            {

                if (control == null) return;

                int currentPos = control.Location.X;

                if (Math.Abs(currentPos - targetPos) <= 5)

                {

                    control.Location = new Point(targetPos, control.Location.Y);

                    animationTimer.Stop();

                }

                int dx = targetPos - currentPos;

                velocity += force * dx;

                velocity *= drag;

                if (Math.Abs(velocity) < 5)

                {

                    if (velocity > 0)

                        velocity = 5;

                    else

                        velocity = -5;

                }

                control.Location = new Point(currentPos + (int)velocity, control.Location.Y);

            };

            animationTimer.Start();

        }

        public void MoveXEx(Control control, int targetPos, Action completeWith = null)

        {

            this.control = control;

            this.targetPos = targetPos;

            velocity = 0;

            animationTimer.Start();

        }

    }

        AnimationHelper animationHelper = new AnimationHelper();

        AnimationHelper animationHelper1 = new AnimationHelper();

        private int pos = 0;

        private int pos1 = 0;

        private int dx = 200;

        private void button1_Click(object sender, EventArgs e)

        {

            animationHelper.MoveXEx(pictureBox2, pos += dx);

            animationHelper1.MoveXEx(pictureBox1, pos1 += dx);

        }

        private void button2_Click(object sender, EventArgs e)

        {

            animationHelper.MoveXEx(pictureBox2, pos -= dx);

            animationHelper1.MoveXEx(pictureBox1, pos1 -= dx);

        }