enum UserInputControls {
kGovernedByOrthoMode = 0x0001,//正交模式管理
kNullResponseAccepted = 0x0002,//允许输入空
kDontEchoCancelForCtrlC = 0x0004,//ctrl C 模式不能重复取消
kDontUpdateLastPoint = 0x0008,//不更新最后一点
kNoDwgLimitsChecking = 0x0010,//不检查点限制
kNoZeroResponseAccepted = 0x0020,//不允许输入0
kNoNegativeResponseAccepted = 0x0040,//不允许输入负数
kAccept3dCoordinates = 0x0080,//允许输入3维坐标(默认2维)
kAcceptMouseUpAsPoint = 0x0100,//允许鼠标选点
kAnyBlankTerminatesInput = 0x0200,//输入空白终止输入
kInitialBlankTerminatesInput = 0x0400,//初始空白终止输入
kAcceptOtherInputString = 0x0800,//接受非关键字字符串输入
kGovernedByUCSDetect = 0x1000,//ucs管理
kNoZDirectionOrtho = 0x2000,//不允许Z轴正交
kImpliedFaceForUCSChange = 0x4000,//暗示ucs变化
kUseBasePointElevation = 0x8000//将基准点的高程用于淘汰选中获得的点
};