更新内容：
1.文件操作功能： 读写CAD文件,支持的文件格式dwg、dxf、dwf
2.增加导出pdf功能
3.增加图纸浏览： 视区放大、缩小，ZoomW、（一键适应全屏)功能，和相关函数
4. 增参数化绘图： 绘直线、圆、圆弧、PL线、、文字，点，块函数，绘制标记
5. 增加构造选择集，,遍历数据库，读写扩展数据，扩展记录，夹点显示，框选和多选，夹点功能，相关接口和函数,取所有图层，取图纸最小外函数，与用户单选对象函数，图上取点类
6. 增加打开图纸完成，初始化完成，对象选择，鼠标移动等事件，相关接口
7. 增加回退
8.MxFunction主要函数：
- public static native void setShowFileBrowse(boolean iShow);
public static native void setShowUpToolBar(boolean iShow);
public static native void setShowDownToolBar(boolean iShow);
public static native void setShowReturnButton(boolean iShow);
public static native void enableSelect(boolean isEnable);
public static native void openFile(String sFile);
public static native void openFileEx(String sFile,int iRC);
public static native boolean writeFile(String sFile);
public static native void doCommand(int iCommand);
public static native void doThreadCommand(int iCommand);
public static native void setToolFile(String sFile);
public static native void setMenuFile(String sFile);
public static native void setLanguage(String sLanguage);
public static native void zoomAll();
public static native void initWorkDir(String sDir);
public static native String getWorkDir();
public static native void sendStringToExecute(String sCmd);
public static native int zoomW( double dLBx, double dLBy, double dRTx, double dRTy);
public static native int zoomCenter( double dCenterX, double dCenterY);
public static native int zoomScale( double dScale);
public static native double[] viewToDoc( double dVx, double dVy );
public static native double[] docToView( double dDx, double dDy );
public static native void deleteObject( long lId);
public static native long findEntAtPoint(double dX,double dY,String sType);
public static native boolean setxDataString(long lId,String sDataName,String sVal);
public static native String getxDataString(long lId,String sDataName);
public static native long drawImageMark(String imageFile, double dDx, double dDy, double dScale);
public static native long drawImage(String imageFile, double dDx, double dDy, double dScale);
public static native long drawImage2(String imageFile, double dDx1, double dDy1, double dDx2, double dDy2);
public static native String getTypeName(long lId);
public static native void setViewColor(int iR, int iG, int iB);
public static native void enableUndo();
public static native void initMxDraw(boolean is,String s1,String s2,String s3,String s4);
public static native String getPreviewFile(String sFile);
public static native long[] getAllLayer();
public static native double[] calcArc(double dX1, double dY1, double dX2, double dY2, double dBulge);
public static native double[] getMcDbDatabaseBound();
9.新增加的类
- McDbArc,McDbCircle,McDbCrve,McDbEntity,McDbLayerTableRecord,McDbLine,McDbMText,McDbObject,McDbPoint,McDbPolyline，McDbText,McDbDbgSelset,McDbDbgUiPrPoint,McDbgUtils
