纪念一下即将逝去的flash，曾今的flash入门学习示例《别盯着我》C#版

flash大限将至，20年如一梦，世纪初最火爆的时候，也曾经随大流学过，但因为没有美术功底，学了也不会做啥动画，不过好多flash小游戏为我打开了编程的大门，最后发现还是编程更有意思，更适合我。

上图中那只虫子是我画的鼠标光标文件，我也不知道是苍蝇还是啥虫子，没有美术功底，画成啥样算啥样，将就着看吧。移动鼠标，两个眼珠会跟着转。

我猜你肯定看过类似这种玩意，当年网络刚盛起的时候，但凡有一个能动的都让大家惊叹不已，鼠标追随就是这样，网页上都喜欢搞点这种特效。

现在大家都见怪不怪了，但是当年刚接触电脑和网络的时候兴奋不已。

这个特效就是那会学习flash时学到的。现在突然想起来了，就想用C#实现一下看看能不能行。做完了觉得还不错。

这个例子其实不是动画，而是编程，需要用到初高中坐标三角函数方面数学计算的知识。下面是主要源代码：

        Point mouse;

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            Console.WriteLine("Mouse Position: ({0},{1})", e.X, e.Y);
            mouse = new Point(e.X, e.Y);
            pictureBox1.Refresh();
        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            DrawFace(e.Graphics);
        }

        public void DrawFace(Graphics graphics)
        {
            graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            Point origin = new Point(this.ClientSize.Width / 2, this.ClientSize.Height / 3);    // 绘图参照中心
            int eyeDistance = 200, eyeSize = 40, ballSize = 24;    // 眼距、眼睛大小、眼珠大小
            Point eyeL = new Point(origin.X - eyeDistance / 2, origin.Y);    // 左眼中心点的坐标
            Point eyeR = new Point(origin.X + eyeDistance / 2, origin.Y);    // 右眼中心点的坐标
            Console.WriteLine("{0}  {1}", eyeL, eyeR);
            graphics.FillEllipse(Brushes.White, eyeL.X - eyeSize / 2, eyeL.Y - eyeSize / 2, eyeSize, eyeSize);
            graphics.FillEllipse(Brushes.White, eyeR.X - eyeSize / 2, eyeR.Y - eyeSize / 2, eyeSize, eyeSize);
            Brush brushBack = new SolidBrush(Color.FromArgb(40, Color.Green));
            int eyeBack = 32;
            graphics.FillEllipse(brushBack, eyeL.X - eyeBack / 2, eyeL.Y - eyeBack / 2, eyeBack, eyeBack);
            graphics.FillEllipse(brushBack, eyeR.X - eyeBack / 2, eyeR.Y - eyeBack / 2, eyeBack, eyeBack);
            Point mouseToLeftEye = new Point(mouse.X - eyeL.X, mouse.Y - eyeL.Y);    // 鼠标相对左眼的坐标
            Point mouseToRightEye = new Point(mouse.X - eyeR.X, mouse.Y - eyeR.Y);   // 鼠标相对右眼的坐标
            double α = Math.Atan2(mouseToLeftEye.Y, mouseToLeftEye.X);      // 左眼转动的角度
            double β = Math.Atan2(mouseToRightEye.Y, mouseToRightEye.X);    // 右眼转动的角度
            int ballDistance = eyeSize / 2 - ballSize / 2;    // 眼睛和眼珠中心点的距离
            Point eyeballL = new Point(eyeL.X + (int)(ballDistance * Math.Cos(α)), eyeL.Y + (int)(ballDistance * Math.Sin(α)));
            Point eyeballR = new Point(eyeR.X + (int)(ballDistance * Math.Cos(β)), eyeR.Y + (int)(ballDistance * Math.Sin(β)));
            graphics.FillEllipse(Brushes.Green, eyeballL.X - ballSize / 2, eyeballL.Y - ballSize / 2, ballSize, ballSize);
            graphics.FillEllipse(Brushes.Green, eyeballR.X - ballSize / 2, eyeballR.Y - ballSize / 2, ballSize, ballSize);
            graphics.FillClosedCurve(Brushes.Red,
                new PointF[] { new PointF(120, 200), new PointF(150, 220), new PointF(230, 230), new PointF(280, 200) });
        }

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