一个简单的涂鸭程式，主要为示范各种拖曳方法等的使用程式具绘直线、矩形、圆形等等绘图功能，并可于同一张图片选取范围进行剪下、复制、贴上-涂鸭a simple program, the main drag to set an example of the use of methods of drawing a straight line program, rectangular, circular mapping functions, etc., and select a picture on th