画图问题，在线等，解决就结贴

Question

以一点（x，y）为圆心，r为半径画一个实心园，C#怎么实现？谢谢！

Answer 1

     private void button1_Click(object sender, EventArgs e)
        {
            Graphics _Graphcis =Graphics.FromHwnd(panel1.Handle);            _Graphcis.DrawEllipse(new Pen(Brushes.Yellow),GetEllopse(new Point(100,100),100));        }        public Rectangle GetEllopse(Point p_CenterPoint, int p_Radius)
        {
            int _X = p_CenterPoint.X - p_Radius;
            int _Y = p_CenterPoint.Y - p_Radius;
            return new Rectangle(_X, _Y, p_Radius * 2, p_Radius * 2);
        }

Answer 2

先计算出外截矩形，然后参考下面代码。外截矩形宽=2r 高=2r
int w = Convert.ToInt32(TextBox1.Text) * 2;
        int h = Convert.ToInt32(TextBox1.Text) * 2;
        Image1.Width = w;
        Image1.Height = h;
        Bitmap bmp = new Bitmap(w, h);
        Graphics g = Graphics.FromImage(bmp);
        g.FillEllipse(new SolidBrush(Color.Red),0,0,w,h);
        bmp.Save(Server.MapPath("~/a.bmp"));
        Image1.ImageUrl = "~/a.bmp";
        g.Dispose(); 

Answer 3

我就想在picturebox里面画一个实心圆，没有bmp需要在控件的paint里面画出来

Answer 4

g.FillEllipse(new SolidBrush(Color.Red),0,0,w,h);正解