winform绘图

System.Windows.Forms.PictureBox pictureBox1


pictureBox1.Load("D:\1.jpg");



void FlushShow(Bitmap bmp)
{
    if (null == bmp) return;
    Graphics grap = Graphics.FromImage(bmp);
    grap.PageUnit = GraphicsUnit.Pixel;
    var font = new Font("宋体", 20, GraphicsUnit.Point);
    var brush = new SolidBrush(Color.Blue);
    grap.DrawString("一二三四", font, brush, 50, 50);
    grap.DrawRectangle(new Pen(Color.Red,10), new Rectangle(10, 10, 200, 200));
    grap.Dispose();
    Point ptLoction = new Point(bmp.Size);
    if (ptLoction.X > pictureBox1.Size.Width || ptLoction.Y > pictureBox1.Size.Height)
    {
        pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
    }
    else
    {
        pictureBox1.SizeMode = PictureBoxSizeMode.CenterImage;
    }

    pictureBox1.Image = bmp;
}