用qt编写的图形工具，可以自己设计图形，然后在widget上画出，类似于windows自带的画板-Graphical tools written using qt, design graphics, and then draw on the widget, similar to the drawing board comes with windows

Qt Widget的拖拽功能实现，利用eventFilter函数实现-Widget drag-and-drop functionality to achieve

tkinter pmw模块，如何建立文件夹并添加功能-tkinter pmw extention, on how to make a notebook and add widget to it

Qwt is an extension to the libraries of the Qt Project. The Qwt library contains widgets and components which are primarily useful for technical and scientifical purposes. It includes a 2-D plotting widget, different kinds of sliders,