簡單的繪製圖形

 public partial class Draw : Form
    ...{
        public Draw()
        ...{
            InitializeComponent();

            SetStyle(ControlStyles.Opaque, true);
        }
        protected override void OnPaint(PaintEventArgs e)
        ...{
            Graphics g = e.Graphics;
            g.FillRectangle(Brushes.Wheat, ClIEntRectangle);
            using (Pen pen = new Pen(Color.Red, 1))
            ...{
                for (int y = 0; y<=ClientRectangle.Height; y += ClIEntRectangle.Height / 12)

                    
                    g.DrawLine(pen, new Point(0, 0), new Point(ClIEntRectangle.Width, y));
                }
            }
            g.FillEllipse(Brushes.Red,new Rectangle(100,100,50,50));
        }
    }

 運行得效果: