Drawing a straight line, circle, and the distance between two points, the dynamic effect of concentric circles, graphics rotation operation

计算机图形
..........\1.txt
..........\11.c.TXT
..........\b.dat
..........\CAO.cpp
..........\c库函数手册.txt
..........\double.cpp
..........\guoqi.cpp
..........\guoqi2.dat
..........\SHAN.TXT
..........\XIAN.TXT
..........\YUAN.TXT
..........\yuanhu.txt
..........\乔布斯演讲全文.txt
..........\建立库函数.txt
..........\新建 文本文档.txt
..........\新建文~1 (2).TXT

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