繪圖使用雙倍緩衝範例

代碼如下:

public   partial   class  Line : Form
     ... {
        public Line()
        ...{
            InitializeComponent();
        }
        protected override void OnPaint(PaintEventArgs e)
        ...{
            //不使用雙倍緩衝
            //Graphics g = e.Graphics;
            //g.FillRectangle(Brushes.White, ClientRectangle);
            //Random r = new Random();
            //for (int x = 0; x < ClientRectangle.Width; x++)
            //{
            //    for (int y = 0; y < ClientRectangle.Height; y += 10)
            //    {
            //        Color c = Color.FromArgb(r.Next(255), r.Next(255), r.Next(255));
            //        using (Pen pen = new Pen(c, 1))
            //        {
            //            g.DrawLine(pen, new Point(0, 0), new Point(x, y));
            //        }
            //    }
            //}

            //使用雙倍緩衝
            Graphics displayGrahics = e.Graphics;
            Random r = new Random();
            Image im = new Bitmap(ClientRectangle.Width, ClientRectangle.Height);
            Graphics g = Graphics.FromImage(im);//建立一張新的GDI+繪圖介面
            g.FillRectangle(Brushes.White, ClientRectangle);
            for (int x = 0; x < ClientRectangle.Width; x++)
            ...{
                for (int y = 0; y < ClientRectangle.Height; y += 10)
                ...{
                    Color c = Color.FromArgb(r.Next(255), r.Next(255), r.Next(255));
                    using (Pen pen = new Pen(c, 1))
                    ...{
                        g.DrawLine(pen, new Point(0, 0), new Point(x, y));//線條先繪製到新建的那張不可見的介面上
                    }
                }
            }
            displayGrahics.DrawImage(im, ClientRectangle);
            im.Dispose();
        }
    }

運行效果圖: