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SetArcDirection 函数
设置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 GetArcDirection 获取弧到达方向
函数原型：
int SetArcDirection (
HDC hdc,int ArcDirection );
参数
hdc
类型：HDC
设备环境句柄。
ArcDirection
类型：int
新的弧到达方向，可用值如下：
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。
返回值
类型：int
函数成功，返回以前的弧到达方向。
函数失败，返回0。
函数失败，返回0。
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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