Qt中使用Qwt实现静态图像的移动与缩放: 鼠标右键恢复上一级 ctrl+鼠标右键 恢复原始状态 鼠标左键 放大 ctrl+鼠标左键 移动图像-Qt is used Qwt mobile and zooming still images: Right-level recovery on the right mouse button to restore the original state ctrl+ left mouse button left mouse button to