方法一：将事件放在form_Load中,在窗体中画图
1: protected void MainForm_Load(object sender,EventArgs e)
2: {
3: InitialPoint();
4: Bitmap bm = new Bitmap(this.Width,this.Height);
5: Graphics grp = Graphics.FromImage(bm);
6: DrawCurves(grp,lpt);
7: pictureBox1.Image =bm;
8: //if use load event,then use bitmap,if not ,there is no need.
9:
10: }
方法二：利用picturebox画图，放在Load事件中。
1: protected void MainForm_Load(object sender,EventArgs e)
2: {
3: InitialPoint();
4: Bitmap bm = new Bitmap(pictureBox1.Width,pictureBox1.Height);
5: pictureBox1.Image =bm;
6: using(Graphics grp =Graphics.FromImage(pictureBox1.Image))
7: {
8: DrawCurves(grp,lpt);
9: }
10:
11: }
方法三：将事件放在Paint事件中，这个只能放在form中，因为grp本例和e无关，但是参数是：PaintEventArgs e
1: private void Form1_Paint(object sender, PaintEventArgs e)
2: {
3: //if in this method,there is no need to use bitmap
4: InitialPoint();
5: Graphics grp =this.CreateGraphics();
6: DrawCurves(grp,lpt);
7: }
方法四：paint事件，在picturebox上，按照下边这个例子，用e这个参数，不仅可以放在form的paint上，也可以放在picturebox的paint上
1: private void pic_paint(object sender,PaintEventArgs e)
2: {
3: Graphics g = e.Graphics;
4: DrawCurves(g,lpt);
5: }
1: private void DrawCurves(Graphics grp, List<Point> pointList)
2: {
3: Point[] temps = new Point[pointList.Count];
4: pointList.CopyTo(temps);
5: grp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
6: grp.DrawCurve(new Pen(Color.Red, 2), temps);
7: // grp.Dispose();如果用Paint事件绘图，这个似乎不可以
8: }
注明：lpt是一个List<Point>