CAD绘一个文字自动剧中的标注（com接口）

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主要用到函数说明：

_DMxDrawX::DrawDimRotated

绘制一个线型标注。详细说明如下：

参数	说明
DOUBLE dExtLine1PointX	输入第一条界线的起始点X值
DOUBLE dExtLine1PointY	输入第一条界线的起始点Y值
DOUBLE dExtLine2PointX	输入第二条界线的起始点X值
DOUBLE dExtLine2PointY	输入第二条界线的起始点Y值
DOUBLE dDimLineLocationX	输入标注线自身上的点X值
DOUBLE dDimLineLocationY	输入标注线自身上的点Y值
DOUBLE dRotationAngle	输入标注的旋转角

实现代码说明：

            MxDrawDatabase MxDrawDatabase1 = (MxDrawDatabase)axMxDrawX1.GetDatabase();
            MxDrawDatabase1.LinetypeScale = 15;
            MxDrawDimStyleTableRecord curDimRecord = MxDrawDatabase1.GetDimStyleTable().GetAt(MxDrawDatabase1.CurrentlyDimstyleName, false);
            MxDrawTextStyleTableRecord curTextRecord = MxDrawDatabase1.GetTextStyleTable().GetAt(MxDrawDatabase1.CurrentlyTextStyle, false);
            curDimRecord.SetDimVarDouble(40, 1000);//设置缩放比例Dimscale
            curDimRecord.SetDimVarInt(271, 0);//设置两位小数DimDle
            curDimRecord.SetDimVarInt(173, 1);  //设置需要显示符号            curDimRecord.SetDimVarInt(289, 3);
            curDimRecord.SetDimVarInt(174, 1);
            curDimRecord.SetDimVarString(342, "_ARCHTICK");    //设置建筑标记
            curTextRecord.bigFontFileName = "gbcbig.shx";
            curTextRecord.fileName = "tssdeng.shx";
            curTextRecord.Name = "默认样式";
            Int64 dimID = axMxDrawX1.DrawDimRotated(100, 100, 100, 200, 200, 150, 0);
            MxDrawDimension Dim = (MxDrawDimension)axMxDrawX1.ObjectIdToObject(dimID);
            Dim.DimensionText = "100";
            Dim.SetDimVarInt(173, 1);  //设置需要显示符号            Dim.SetDimVarInt(289, 0);
            Dim.SetDimVarInt(174, 1);
            Dim.SetDimVarString(342, "_ARCHTICK");    //设置建筑标记
            MxDrawPoint textPos = new MxDrawPoint();
            textPos.x = 200;
            textPos.y = 150;
            Dim.TextPosition = textPos;
            Dim.UsingDefaultTextPosition = false;
            Dim.RecomputeDimBlock(true);
            axMxDrawX1.UpdateDisplay();
            axMxDrawX1.ZoomAll();