C#关于imageBox中鼠标获取ROI区域

C#中关于鼠标获取感兴趣区域方式，分享下

在Form1.cs中添加

 private void imageBox1_MouseDown(object sender, MouseEventArgs e)
        {
            _x = e.X;
            _y = e.Y;
            isDragging = true;
        }
        private void imageBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isDragging)
            {
                int sx = _x < e.X ? _x : e.X;
                int sy = _y < e.Y ? _y : e.Y;
                int w = Math.Abs(_x - e.X);
                int h = Math.Abs(_y - e.Y);
                ControlPaint.DrawReversibleFrame(lastRect, this.BackColor, FrameStyle.Dashed);
                lastRect = new Rectangle(_x,_y, w,h);
                ControlPaint.DrawReversibleFrame(lastRect, this.BackColor, FrameStyle.Dashed);
            }
        }
        private void imageBox1_MouseUp(object sender, MouseEventArgs e1)
        {
            if (isDragging)
            {
                isDragging = false;
                ControlPaint.DrawReversibleFrame(lastRect, this.BackColor, FrameStyle.Dashed);

               // MessageBox.Show("the rect is " + lastRect);
            }
        }

在Form1.Designer.cs中private void InitializeComponent()添加

            this.imageBox1.MouseDoubleClick += new System.Windows.Forms.MouseEventHandler(this.imageBox1_MouseDoubleClick);
            this.imageBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.imageBox1_MouseDown);
            this.imageBox1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.imageBox1_MouseMove);
            this.imageBox1.MouseUp += new System.Windows.Forms.MouseEventHandler(this.imageBox1_MouseUp);
        private void imageBox1_MouseDoubleClick(object sender, MouseEventArgs e1)
        {
            frame = 1;
            //MessageBox.Show("the rect is " + lastRect);
        }