VC实现图像平滑滚动效果,在有限的区域中显示了一幅大图，这时要浏览图像的各个部分，这就需要用到图像的滚动。但其中的关键点和难点，即拖动中的刷新和闪烁问题，下面我将详细分析实现方法。-VC realize smooth image scrolling effects, in limited areas to display a large map, this time to visit all parts of the image, which requires use of the scroll