画图程序 做了个基础的画图方便大家扩展 主要功能: 在图片上画线(可调节颜色与笔触) 支持撤销与反撤销 支持重新载入 支持图片拉伸-Paint program to do a basic drawing to facilitate the expansion of the main function: draw a line in the picture (you can adjust the color and brush strokes) to support the