在C#的Picturebox上畫線畫圓

 在C#的Picturebox上畫線畫圓, 以下是相關介紹:

可先參考 Graphics 成員
實作(注意*那行Graphics objGraphic = e.Graphics;):

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

private void pictureBox1_Paint(object sender, PaintEventArgs e) {             int picBoxWidth = pictureBox1.Size.Width;             int picBoxHeight = pictureBox1.Size.Height;             int halfWidth = pictureBox1.Size.Width / 2;             int halfHeight = pictureBox1.Size.Height / 2;             Graphics objGraphic = e.Graphics; //**請注意這一行**             Pen pen = new Pen(Color.Black);             int b = 2; int m = 2; for (int x = 0; x < 426; x++)             {                 int y = m * x + b; x = (y - b) / m;                 objGraphic.DrawLine(pen, x, y, -x, -y);                 System.Drawing.Drawing2D.GraphicsState graph = objGraphic.Save();                 objGraphic.Restore(graph);             }             objGraphic.DrawLine(pen, 0, halfHeight, picBoxWidth, halfHeight);             objGraphic.DrawLine(pen, halfWidth, 0, halfWidth, picBoxHeight);             objGraphic.DrawLine(pen, 20, 20, 300, 300); }

資料來源 http://trufflepenne.blogspot.com/2010/11/cpicturebox.html