QWT是一个QT的第三方库，可以用其来开发各种图形 表格文件。这是最新的版本，加入了新的控件。可以直接在QTDESIGNER里面调用。-The Qwt library contains GUI Components and utility classes which are primarily useful for programs with a technical background. Beside a 2D plot widget it provides scales, sliders,