LeadTools 移动选择区域

论坛中有用户提出如何通过鼠标移动选择区域，但不希望选择区域图片伴随移动。考虑到会有其他用户也会用到这个场景，所以在此共享给大家。

步骤如下：

使用 AddRectangleToRegion 设置选择区域：

            codecs = new RasterCodecs();
            rasterImageViewer1.Image = codecs.Load(@"..\..\test.png");
            rasterImageViewer1.InteractiveRegionRectangle += rasterImageViewer1_InteractiveRegionRectangle;
            rasterImageViewer1.InteractiveRegionType = RasterViewerInteractiveRegionType.Rectangle;
            rasterImageViewer1.Image.AddRectangleToRegion(null, new LeadRect(214, 176, 147, 172), RasterRegionCombineMode.Set);

该功能需要结合鼠标按下、移动及释放事件进行选择区域的移动：

            rasterImageViewer1.MouseDown += rasterImageViewer1_MouseDown;
            rasterImageViewer1.MouseMove += rasterImageViewer1_MouseMove;
            rasterImageViewer1.MouseUp += rasterImageViewer1_MouseUp;

使用 MouseDown 事件开启移动标记位：

        bool flag = false;
        void rasterImageViewer1_MouseDown(object sender, MouseEventArgs e)
        {
            flag = true;
        }

在 MouseMove 事件中通过重绘选择区域实现移动：

        void rasterImageViewer1_MouseMove(object sender, MouseEventArgs e)
        {
            if (flag)
            {
                
                LeadRect lr = rasterImageViewer1.Image.GetRegion(null).GetBounds();
                rasterImageViewer1.Image.AddRectangleToRegion(null, new LeadRect(e.X-214, e.Y-176, 147, 172), RasterRegionCombineMode.Set);                
            }
        }

在 MouseUp 事件中关闭移动标记：

        void rasterImageViewer1_MouseUp(object sender, MouseEventArgs e)
        {
            flag = false;
        }

效果图：

Demo 下载：VS2013 + LeadTools V19 + .NET 4.0