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：
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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;
}
下面的例子通过重载Form 窗体的OnPaint()方法绘制GDI图形Protected Overrides Sub onpaint(ByVal e As System Windows Forms PaintEventArgs)注释 /////////////绘制任意直线Dim g As Graphics = e GraphicsDim mypen As Pen = New Pen(Color Red )g DrawLine(mypen )注释 /////////////绘制矩形(任意直线构成的封闭图形)Dim point As PointF = New PointF( F F)Dim point As PointF = New PointF( F F)Dim point As PointF = New PointF( F F)Dim point As PointF = New PointF( F F)Dim curvepoints As PointF() = {point point point point }g DrawPolygon(New Pen(Color Blue ) curvepoints)注释 ////////////文本表示Dim FFamily As FontFamily = New FontFamily( Arial )Dim font As Font = New Font(FFamily FontStyle Bold FontStyle Italic GraphicsUnit Pixel)Dim text As String = I love you! Dim solidbrush As SolidBrush = New SolidBrush(Color Red)Dim pr As PointF = New PointF( )e Graphics DrawString(text font solidbrush pr)注释 ////////////平面绘制Dim rec As RectangleF = New RectangleF( )g DrawPie(mypen rec )注释 ///////////封闭图形 应该是个圆g DrawClosedCurve(mypen curvepoints Drawing Drawing D FillMode Alternate)注释 ///////////大家自己试试看吧g DrawArc(mypen )g DrawCurve(mypen curvepoints)g DrawBezier(mypen )g DrawBeziers(mypen curvepoints)注释 //////////这可是一个圆Dim rec As RectangleF = New RectangleF( )g DrawEllipse(mypen rec )注释 //////////这是一个椭圆Dim rec As RectangleF = New RectangleF( )g DrawEllipse(mypen rec )End Sub 这些是我自己试验出来的 当然了 还有好多 我只是开了一个头 大家要是发现什么好东东 别忘了通知一下 ） lishixinzhi/Article/program/net/201311/11800
可以使用窗体BackgroundImage属性显示图像，
也可以使用PictureBox的BackgroundImage属性显示图像。
