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Dim myGraphics As Graphics = Me.CreateGraphics '声明并创建一个Graphics对象
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Dim myPen As Pen = New Pen(Drawing.Color.Black, 3) '声明一个画笔，并设定颜色和粗细
myPen.DashStyle = Drawing.Drawing2D.DashStyle.Solid '线型，Solid是实线
myGraphics.DrawEllipse(myPen, 200, 200, 100, 100) '画圆，数值依次是：横坐标、纵坐标、宽度和高度（宽高相同为正圆，否则为椭圆）
myGraphics.Dispose() '释放Graphics占用的资源
新建一个Winform，拖两个图片框。图片框1在设计器中选择一个图片（尺寸在图片框容纳为佳）。如下代码测试通过：
private void button1_Click(object sender, EventArgs e)
{
Image img1 = this.pictureBox1.Image;
Image img2 = CropToCircle(img1);
this.pictureBox2.Image = img2;
}
public Image CropToCircle(Image img1)
{
Image img2 = new Bitmap(img1.Width, img1.Height,
img1.PixelFormat);
Graphics g = Graphics.FromImage(img2);
using (Brush br =
new SolidBrush(SystemColors.Control))//背景色
{
g.FillRectangle(br, 0, 0,
img2.Width, img2.Height);
}
GraphicsPath path = new GraphicsPath();
path.AddEllipse(0, 0, img2.Width, img2.Height);
g.SetClip(path);
g.DrawImage(img1, 0, 0);
return img2;
}
Public a(8) As OvalShape
Dim canvas= New Microsoft.VisualBasic.PowerPacks.ShapeContainer
ConstCircleSize As Integer= 20
Const Dist As Integer = 10
Const Gap As Integer = 50
Dim i As Integer
canvas.Parent = Me.Panel1
For i =0 To 8
a(i) = NewOvalShape
a(i).Size = New Size(CircleSize,CircleSize)
a(i).Location = New Point(Dist +Gap * (i Mod 3), Dist + Gap * (i \ 3))
a(i).BorderWidth = 3
a(i).Enabled = True
a(i).Visible = True
a(i).Parent = canvas
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