编程实现：读一幅图像（BMP或JPG格式）并根据显示窗口大小自适应显示全图，实现如下功能：（1）可任意角度旋转；（2）可任意放大缩小；（3）任意选择一个区域，画出该区域图像的灰度直方图.-Programming: Reading an image (BMP or JPG format) and in accordance with the size of adaptive display window shows the entire map, the achievement of the fo