ASCII 格式的DXF文件可以用java利用组码实现,每个部分可进行封装。组码的书写需要注意空格,每行组码结束不能有空格,不然无法解析
1.header实现,getBoundX getBoundY是定义当前画布的左上角XY坐标,getBoundWidth(),getBoundHeight()是画布长宽
private void writeHeader () throws IOException { writeBufferLine ( " 0" ) ; writeBufferLine ( "SECTION" ) ; writeBufferLine ( " 2" ) ; writeBufferLine ( "HEADER" ) ; writeBufferLine ( " 9" ) ; writeBufferLine ( "$EXTMIN" ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( new Double ( getBoundX () ).toString () ) ; writeBufferLine ( "20" ) ; writeBufferLine ( new Double ( getBoundY () ).toString () ) ; writeBufferLine ( "30" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 9" ) ; writeBufferLine ( "$EXTMAX" ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( new Double ( convertXToPaper ( getBoundX () + getBoundWidth () ) ). toString () ) ; writeBufferLine ( "20" ) ; writeBufferLine ( new Double ( convertYToPaper ( getBoundY () + getBoundHeight () ) ). toString () ) ; writeBufferLine ( " 9" ) ; writeBufferLine ( "$LIMMIN" ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( new Double ( convertXToPaper ( getBoundX () ) ).toString () ) ; writeBufferLine ( " 20" ) ; writeBufferLine ( new Double ( convertYToPaper ( getBoundY () ) ).toString () ) ; writeBufferLine ( " 9" ) ; writeBufferLine ( "$LIMMAX" ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( new Double ( convertXToPaper ( getBoundX () + getBoundWidth () ) ). toString () ) ; writeBufferLine ( " 20" ) ; writeBufferLine ( new Double ( convertYToPaper ( getBoundY () + getBoundHeight () ) ). toString () ) ; writeBufferLine ( " 9" ) ; writeBufferLine ( "$PEXTMIN" ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( new Double ( convertXToPaper ( getBoundX () ) ).toString () ) ; writeBufferLine ( "20" ) ; writeBufferLine ( new Double ( convertYToPaper ( getBoundY () ) ).toString () ) ; writeBufferLine ( "30" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 9" ) ; writeBufferLine ( "$PEXTMAX" ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( new Double ( convertXToPaper ( getBoundX () + getBoundWidth () ) ). toString () ) ; writeBufferLine ( "20" ) ; writeBufferLine ( new Double ( convertYToPaper( getBoundY () + getBoundHeight () ) ). toString () ) ; writeBufferLine ( "30" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 0" ) ; writeBufferLine ( "ENDSEC" ) ; }
2.定义图层和类型
private void writeTables () throws IOException { writeBufferLine ( " 0" ) ; writeBufferLine ( "SECTION" ) ; writeBufferLine ( " 2" ) ; writeBufferLine ( "TABLES" ) ; writeTableLAYER () ; writeTableLTYPE () ; writeBufferLine ( " 0" ) ; writeBufferLine ( "ENDSEC" ) ; }
3.具体的资源
资源一般是点,线,多条线,面,面资源也是无数条线组成,所以就点、线结构
可对写点,写线,和点线的标注进行封装,写入资源的方式很重要,1种是直接写入ENTITIES中,
这种写法当用mapinfo转成tab格式时,每个图层可用表展现,但是表里不会带入点、线的属性。
a:写线
private void writePolylineAD ( Point2D[] _pts , int _color , String _lineStyle , String _layerName ) throws IOException { if ( _pts.length > 2 ) { for ( int i = 0 ; i <= _pts.length - 1 ; i++ ) { if ( i < _pts.length - 1 ) { Point2D[] pts = new Point2D.Double[2 ] ; pts[ 0 ] = _pts[ i ] ; pts[ 1 ] = _pts[ i + 1 ] ; writePolylineAD ( pts , _color , _lineStyle , _layerName ) ; } } return ; } writeBufferLine ( " 0" ) ; writeBufferLine ( "POLYLINE" ) ; writeBufferLine ( " 8" ) ; writeBufferLine ( _layerName ) ; writeBufferLine ( " 62" ) ; writeBufferLine ( new Integer ( _color ).toString () ) ; writeBufferLine ( " 6" ) ; writeBufferLine ( _lineStyle ) ; writeBufferLine ( " 66" ) ; writeBufferLine ( " 1" ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 20" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 30" ) ; writeBufferLine ( "0.0" ) ; for ( int j = 0 ; j < _pts.length ; j++ ) { writeBufferLine ( " 0" ) ; writeBufferLine ( "VERTEX" ) ; writeBufferLine ( " 8" ) ; writeBufferLine ( _layerName ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( new Double ( _pts[ j ].getX () ).toString () ) ; writeBufferLine ( " 20" ) ; writeBufferLine ( new Double ( _pts[ j ].getY () ).toString () ) ; writeBufferLine ( " 30" ) ; writeBufferLine ( "0.0" ) ; } writeBufferLine ( " 0" ) ; writeBufferLine ( "SEQEND" ) ; writeBufferLine ( " 8" ) ; writeBufferLine ( _layerName ) ; }
b:写标注
private void writeText ( double _x , double _y , double _fontSize , int _color , String _text , int Align , String _layerName , double _angle,double xOffset,double yOffset ) throws IOException { if(_text.contains("<br>")) { ArrayList<String> textA=splitBR(_text); for(int j=0;j<textA.size();j++) { double tY; tY=_y-j*_fontSize; writeText(_x,tY,_fontSize,_color,textA.get(j).toString(),Align,_layerName,_angle,xOffset,yOffset); } }else { Rectangle2D rect = new Rectangle2D.Double ( getBoundX () , getBoundY () , getBoundWidth () , getBoundHeight () ) ; int out = rect.outcode ( _x , _y ) ; if ( out != 0 ) { return ; } if ( _text == null || _text.equals ( "" ) ) return ; writeBufferLine ( " 0" ) ; writeBufferLine ( "TEXT" ) ; writeBufferLine ( " 8" ) ; // if ( m_bLabelMerge ) // writeBufferLine ( "label" ) ; // else writeBufferLine ( _layerName ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( new Double ( convertX ( _x ) +xOffset).toString () ) ; writeBufferLine ( " 20" ) ; writeBufferLine ( new Double ( convertY ( _y )+yOffset ).toString () ) ; writeBufferLine ( " 30" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 11" ) ; writeBufferLine ( new Double ( convertX ( _x ) +xOffset).toString () ) ; writeBufferLine ( " 21" ) ; writeBufferLine ( new Double ( convertY ( _y )+yOffset ).toString () ) ; writeBufferLine ( " 31" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 40" ) ; writeBufferLine ( new Double ( _fontSize ).toString () ) ; writeBufferLine ( " 41" ) ; writeBufferLine ( "0.78" ) ; writeBufferLine ( " 50" ) ; writeBufferLine ( new Double ( _angle ).toString () ) ; if ( false ) { //文字颜色,暂时不实现 writeBufferLine ( " 62" ) ; writeBufferLine ( new Integer ( _color ).toString () ) ; } writeBufferLine ( " 1" ) ; //去掉换行符,该版本不支持 _text = _text.replace ( "\r" , "" ) ; _text = _text.replace ( "\n" , "" ) ; writeBufferLine ( _text ) ; writeBufferLine ( " 72" ) ; writeBufferLine ( new Integer ( Align ).toString () ) ; writeBufferLine ( " 73" ) ; writeBufferLine ( "3" ) ; } }
第二种是把点线以BLOCKS包装,属于带属性的导出。
点属性导出
private void writeGisPointSingleAtt(IMapVertex v,String layerName,int blockNum,int objNum) throws IOException { writeBufferLine ( " 0" ) ; writeBufferLine ( "BLOCK" ) ; writeBufferLine ( " 8" ) ; writeBufferLine ( layerName ) ; writeBufferLine ( " 2" ) ; //组码 block 名称 writeBufferLine ( "BLKP"+String.valueOf(blockNum)+"p"+String.valueOf(objNum) ) ; writeBufferLine ( " 70" ) ; writeBufferLine ( " 2" ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 20" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 30" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 0" ) ; writeBufferLine ( "POINT" ) ; writeBufferLine ( " 8" ) ; writeBufferLine ( layerName ) ; writeBufferLine ( " 62" ) ; writeBufferLine ( " 1" ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( new Double(v.getX()).toString() ) ; writeBufferLine ( " 20" ) ; writeBufferLine ( new Double(v.getY()).toString() ) ; writeBufferLine ( " 30" ) ; writeBufferLine ( "0.0" ) ; ArrayList<String> attr=new ArrayList<String>(); attr.add("Name"); attr.add("Longitude"); attr.add("Latitude"); attr.add("Planid"); attr.add("IsVirtual"); attr.add("Isabpoint"); attr.add("Iskeyres"); attr.add("Cutpoints"); writeAttrInVertex(attr,layerName); writeBufferLine ( " 0" ) ; writeBufferLine ( "ENDBLK" ) ; }
//每个点带属性导出至DXF,便于mapinfo的转换 //20121221 private void writeGisPointWithAtt(ArrayList<IMapVertex> res,ArrayList<String> layerNameRes) throws IOException { for(int i=0;i<res.size();i++) { YVertexReduce v=(YVertexReduce)res.get(i).getID(); writeBufferLine ( " 0" ) ; writeBufferLine ( "BLOCK" ) ; writeBufferLine ( " 8" ) ; writeBufferLine ( layerNameRes.get(i) ) ; writeBufferLine ( " 2" ) ; //组码 block 名称 writeBufferLine ( "BLK"+String.valueOf(i) ) ; writeBufferLine ( " 70" ) ; writeBufferLine ( " 2" ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 20" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 30" ) ; writeBufferLine ( "0.0" ) ; writeBufferLine ( " 0" ) ; writeBufferLine ( "POINT" ) ; writeBufferLine ( " 8" ) ; writeBufferLine ( layerNameRes.get(i) ) ; writeBufferLine ( " 62" ) ; writeBufferLine ( " 1" ) ; writeBufferLine ( " 10" ) ; writeBufferLine ( new Double(v.geoX).toString() ) ; writeBufferLine ( " 20" ) ; writeBufferLine ( new Double(v.geoY).toString() ) ; writeBufferLine ( " 30" ) ; writeBufferLine ( "0.0" ) ; ArrayList<String> attr=new ArrayList<String>(); attr.add("Name"); attr.add("Longitude"); attr.add("Latitude"); attr.add("Planid"); attr.add("IsVirtual"); attr.add("Isabpoint"); attr.add("Iskeyres"); attr.add("Cutpoints"); writeAttrInVertex(attr,layerNameRes.get(i)); writeBufferLine ( " 0" ) ; writeBufferLine ( "ENDBLK" ) ; } }
4.结尾
private void writeTail () throws IOException { writeBufferLine ( " 0" ) ; writeBufferLine ( "EOF" ) ; }
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