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GetArcDirection 函数
返回指定设备环境当前的弧到达方向。弧和矩形函数使用弧到达方向。
可通过 SetArcDirection 设置弧到达方向
函数原型：
int GetArcDirection (
HDC hdc );
参数
hdc
类型：HDC
设备环境句柄。
返回值
类型：int
返回当前弧到达方向。可能的值如下：
AD_COUNTERCLOCKWISE：逆时针方向。
AD_CLOCKWISE ：顺时针方向。
AD_COUNTERCLOCKWISE：逆时针方向。
AD_CLOCKWISE ：顺时针方向。
备注
默认弧到达方向是逆时针方向。
支持
| 最低桌面系统支持 | Windows 2000 Professional |
| 头文件 | Wingdi.h (已包含在Windows.h中) |
| 库 | Gdi32.lib |
| DLL | Gdi32.dll |
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