图书馆系统，不是用可视化做的。实现了图书馆的存书显示、借书、还书功能。-Library system, not with the visual rendering them visually. Achieved a library of books show that library, but also the book feature.

用于实现左右纵坐标都有数值，绘制带箭头的图像，在指定点添加文字-For implementing around the vertical axis has value, rendering the image with arrows, add text to a specified point