该程序能够实现矢量图的基本绘制以及文本标注功能，如放大缩小，画直线段，画折线，圆等-the process to achieve the basic vector drawing and text annotation capabilities, such as zooming, line painting, painting dogleg, round, etc.

该程序能够实现矢量图的基本绘制以及文本标注功能，如放大缩小，画直线段，画折线，圆等-the process to achieve the basic vector drawing and text annotation capabilities, such as zooming, line painting, painting dogleg, round, etc.

二维的画图类，可以进行点，线，三角形，矩形，椭圆，圆等形状的画图，并可进行缩放，是一个完整的类，直接调入自己的程序里面使用就可以的。-two-dimensional drawing class, for point, line, triangular, rectangular, oval, round shapes such as drawing, to carry out the zoom, is a complete categor