CDC::Arc以及画一个电抗器

参考：MSDN

Draws an elliptical arc.//画一个椭圆曲线

语法

BOOL Arc(
   int x1,
   int y1,
   int x2,
   int y2,
   int x3,
   int y3,
   int x4,
   int y4 
);
BOOL Arc(
   LPCRECT lpRect,
   POINT ptStart,
   POINT ptEnd 
);

参数

x1

Specifies the x-coordinate of the upper-left corner of the bounding rectangle (in logical units).//矩形边界的x1

y1