C#绘制抛物线

C# 抛物线 public partial class Form1 : Form { Bitmap oriBmp = null; Bitmap oriBmp1 = null; Bitmap bufferBmp = null; double a, b, c; float xx, yy; public Form1() { InitializeComponent(); } //绘制坐标系 private void Form1_Load(object sender, EventArgs e) { pictureBox1.Image = new Bitmap(400, 400); Graphics g = Graphics .FromImage (pictureBox1.Image ); g.Clear(Color.White); Pen blackPen = new Pen(Color.Black, 1); g.TranslateTransform(200, 200);