绘图实例C#

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private void button1_Click(object sender, EventArgs e)         {   //Form窗口画线条图形             //Graphics gp = e.Graphics;//创建GDI对象             Graphics gp = CreateGraphics();////创建GDI对象方法2             Pen p1 = new Pen(Color.Red, 5);//钢笔线条5镑蓝色             Rectangle rec = new Rectangle(10, 10, 100, 100);//创建矩形实例             gp.DrawLine(p1, 100, 100, 600, 100);//画直线             gp.DrawRectangle(p1, rec);//画矩形             gp.DrawEllipse(p1, 200, 200, 100, 100);//绘一个圆  //以下是纯色填充图形             Brush br = new SolidBrush(Color.Red);//创建一个笔刷             gp.FillEllipse(br, rec);//画一个填充的圆  //以下是图形绘在PictureBox中。             Graphics gp1;               Image theImage;//要绘图的图片对象             theImage = new Bitmap(400,400);//实例化一个图片对象             gp1= Graphics.FromImage(theImage);             pictureBox1.Image = theImage;             Pen drawPen = new Pen(Color.Blue, 2); //画笔工具             gp1.DrawEllipse(drawPen, 100, 100, 200, 200);//绘一个图片填充的圆             p1.Dispose();//释放钢笔资源             gp.Dispose();//释放GDI资源             br.Dispose();//释放笔刷资源            // brImg.Dispose();//释放图片对象资源         }