电子签名系统，常应用博物馆触屏工控机，类似于手绘板，在pc上可用鼠标测试，功能：改变背景图片，改变画笔粗细和颜色，保存图片到本地硬盘。程序基于qt.4.7.2环境编写。-Commonly used museum touch-screen electronic signature system, industrial control, similar to the drawing board, available on the PC mouse test, function: change the