cgm圖形解析技術(shù)在民用航空交互性電子手冊(cè)中的應(yīng)用

1、2022 年 1 月 January 2022 Digital Technology protected String fileName=null ;protected int currentArg=0;private int posInArg=0;private final int elementClass;private final int elementCode;public Command(int ec,int eid,

2、int l,DataInput in) throws IOException {this.elementClass = ec;this.elementCode = eid;if (l != 31) {this.args = new int[l];for (int i = 0; i < l; i++)this.args[i] = in.readUnsignedByte();if (l % 2 == 1) {int skip = in

3、.readUnsignedByte();}}else{boolean done=true;int a=0;do{l=read16(in);if(l == -1)break;if((ll = l}else{done=true;}if(this.args==null) {this.args=new int[l];}else {this.args=Arrays.copyOf(this.args,this.args.length+l);}for

4、(int i=0;i<l;i++)this.args[a++] =in.readUnsignedByte();if (l % 2==1){int skip=in.readUnsignedByte();assert(skip==0):“skipping data“;}}while (!done);}}}4.2 元素解析在實(shí)現(xiàn)了結(jié)構(gòu)定義和基本數(shù)據(jù)讀取的基礎(chǔ)上，根據(jù)CGM文件結(jié)構(gòu)的向量元素分類，進(jìn)行分類數(shù)據(jù)讀取。每個(gè)元素類別都定義了一個(gè)

5、抽象類，用以描繪這個(gè)類別的共有特性和方法，每個(gè)類別都有若干個(gè)實(shí)現(xiàn)類，用以實(shí)現(xiàn)具體的向量元素，抽象類的讀取分類方法如下，由于目前基于交互性電子手冊(cè)系統(tǒng)應(yīng)用場(chǎng)景限制，在日常的CGM圖片中，通常不存在段元素和應(yīng)用程序元素，所以CGM中的段元素和應(yīng)用程序結(jié)構(gòu)元素尚未實(shí)現(xiàn)，但是CGM圖片的整體和細(xì)節(jié)都不會(huì)受到影響[11]。protected static Command readCommand(DataInput in,int ec,int ei

6、d,int l,String fileName,String... params) throws IOException {switch (ElementClass.getElementClass(ec)) {case DELIMITER_ELEMENTS:// 0return Delimiter.readDelimiterElements(in,ec,eid,l,fileName,params);case METAFILE_DESCR

7、IPTOR_ELEMENTS://1 return MetafileDescriptor.readMetaFileDescriptorElements(in,ec,eid,l,fileName);case PICTURE_DESCRIPTOR_ELEMENTS://2return PictureDescriptor.readPictureDescriptorElements(in,ec,eid,l);case CONTROL_ELEME

8、NTS://3return Control.readControlElements(in,ec,eid,l);case GRAPHICAL_PRIMITIVE_ELEMENTS://4return GraphicalPrimitive.readGraphicalPrimitiveElements(in,ec,eid,l,fileName);case ATTRIBUTE_ELEMENTS://5邱昱：CGM圖形解析技術(shù)在民用航空交互性電子