如下的程序绘制多边形，请将程序填写完整 private void button1_Click(object sender, EventArgs e) { Graphics g = 第1空 Pen myPen = new Pen(Color.Black, 4); Point point1 = new Point(0, 0); Point point2 = new Point(0, 100); Point point3 = new Point(100, 0); Point[] Points = { point1, point2, point3 }; 第2空 }