C# winForm PictureBox 缩放

Question

话说有这些属性，设置picbox的Dock可以跟随form变化，设置max，minsize可以限制其大小！

Answer 1

利用双倍缓冲迅速在PictureBox中绘制，然后再缩放，这里是双倍缓冲的例子：http://bailong139.blog.163.com/blog/static/207238100201252654045840/http://bailong139.blog.163.com/blog/static/207238100201252654727933/

Answer 2

是不是需要实现用鼠标可以改变picturebox的大小？代码：PictureBox可拖拽拉伸的picturebox
        const int HTLEFT = 10;
        const int HTRIGHT = 11;
        const int HTTOP = 12;
        const int HTTOPLEFT = 13;
        const int HTTOPRIGHT = 14;
        const int HTBOTTOM = 15;
        const int HTBOTTOMLEFT = 0x10;
        const int HTBOTTOMRIGHT = 17;        protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case 0x0084:
                    base.WndProc(ref m);
                    Point vPoint = new Point((int)m.LParam & 0xFFFF,
                        (int)m.LParam >> 16 & 0xFFFF);
                    vPoint = PointToClient(vPoint);
                    if (vPoint.X <= 5)
                        if (vPoint.Y <= 5)
                            m.Result = (IntPtr)HTTOPLEFT;
                        else if (vPoint.Y >= ClientSize.Height - 5)
                            m.Result = (IntPtr)HTBOTTOMLEFT;
                        else m.Result = (IntPtr)HTLEFT;
                    else if (vPoint.X >= ClientSize.Width - 5)
                        if (vPoint.Y <= 5)
                            m.Result = (IntPtr)HTTOPRIGHT;
                        else if (vPoint.Y >= ClientSize.Height - 5)
                            m.Result = (IntPtr)HTBOTTOMRIGHT;
                        else m.Result = (IntPtr)HTRIGHT;
                    else if (vPoint.Y <= 5)
                        m.Result = (IntPtr)HTTOP;
                    else if (vPoint.Y >= ClientSize.Height - 5)
                        m.Result = (IntPtr)HTBOTTOM;
                    break;
                case 0x0201://鼠标左键按下的消息    
                 m.Msg = 0x00A1;//更改消息为非客户区按下鼠标    
                m.LParam = IntPtr.Zero;//默认值    
                m.WParam = new IntPtr(2);//鼠标放在标题栏内    
               base.WndProc(ref m);
                break;
                default:
                    base.WndProc(ref m);
                    break;
            }
        }