gui_layer.cpp

linux下一款GIS程序源码

	    else
	    {
		UGKError(ET_Failure,UGKErr_OutOfMemory,
				"GUI_Layer::ReadGeomDataFromFile()");
		return ;
	    }	    
	    pGeoLine->addLine(0,pPoints,numPT);
	    pFeaData->setGeometryData(pGeoLine);
	    break;
	case wkbMultiPolygon:
	    pGeoLine = new GUI_GeometryLine;
	    m_UGKMultiPolygon = (UGKMultiPolygon  *)pGeoData;
	    pGeoLine->setGeoNum(m_UGKMultiPolygon->getNumGeometries());
	    
	    for(m=0;m<m_UGKMultiPolygon->getNumGeometries();m++)
	    {
		m_UGKPolygon = (UGKPolygon *)(m_UGKMultiPolygon->getGeometryRef(m));
		m_UGKLineString = m_UGKPolygon->getExteriorRing();
		numPT = m_UGKLineString->getNumPoints();
		pPoints = NULL;
		pPoints =(RawPoint *)UGK_Calloc(numPT,sizeof(RawPoint));
		if(pPoints)
		{
		    for(n=0;n<numPT;n++)
		    {
			(pPoints+n)->x = m_UGKLineString->getX(n);
			(pPoints+n)->y = m_UGKLineString->getY(n);
		    }		     
		}
		else
		{
		    UGKError(ET_Failure,UGKErr_OutOfMemory,
			     "GUI_Layer::ReadGeomDataFromFile()");
		    return ;
		}
		pGeoLine->addLine(m,pPoints,numPT);
	    }
	    pFeaData->setGeometryData(pGeoLine);
	    break;
	case wkbMultiPoint:
	case wkbGeometryCollection:
	case wkbLinearRing:
	case wkbUnknown:
	case wkbNone:
	default :
		;	
    }
    
    
}

/***************************************************************
             读文件,初始化地图数据
***************************************************************/
int GUI_Layer::InitDataFromFile()
{
    printf("Init Map Data from File\n");
    if(m_FileName==NULL)
    {
	UGKError(ET_Failure,UGKErr_FileIO,
		 "GUI_Layer::InitDataFromFile(),file name not specified!");
	return -1;
    }
    
    TABFile *m_tabFile= new TABFile;
    if( (m_tabFile->Open(m_FileName,"r")) !=0)
    {
	UGKError(ET_Failure,UGKErr_FileIO,
		 "GUI_Layer::InitDataFromFile(),file read failed!!");
	return -1;
    }
    
    /*    图层区域在 setLayerAttr()中已经设置           */
    //UGKEnvelope lyrExtent;    
    //m_tabFile->GetExtent(&lyrExtent,0);
    //setLayerExtent(lyrExtent.MaxX,lyrExtent.MinX,lyrExtent.MaxY,lyrExtent.MinY);
    
    // ----ZGQ  这个视野 地图中心 应该由图层管理器来告诉
    //setLayerView(lyrExtent.MaxX-lyrExtent.MinX,lyrExtent.MaxY-lyrExtent.MinY);
    //setLayerCenter( (lyrExtent.MaxX+lyrExtent.MinX)/2, (lyrExtent.MaxY+lyrExtent.MinY)/2 );
    m_tabFile->ResetReading();
    m_tabFile->SetUseSpatialIndex(FALSE);
    setFeatureNum(m_tabFile->GetFeatureCount(1) );
    
    TABMAPFile    *pMapFile = m_tabFile->GetMAPFileRef();
    pMapFile->InitDrawingTools(); //先读取所有的绘图工具定义表
    TABToolDefTable *pToolDef = pMapFile->GetToolDefTableRef();	
    CopyToolDefTable( pToolDef );
    
  
    UGKFeature       *pUGKFeature;
    GUI_FeatureData   *pFeaData;
    
    TABPoint    *m_PointFea;
    TABFontPoint *m_FontPointFea;
    TABText     *m_TextFea;
    TABPolyline  *m_PolylineFea;
    TABRegion   *m_RegionFea;
    
    // 开始逐个访问Feature 
    while( (pUGKFeature = m_tabFile->GetNextFeature()) != NULL )
    {
	pFeaData= new GUI_FeatureData;
	
	//=========  读取该Feature的字段名 =================
	UGKFeatureDefn  *pUGKFeatureDefn = m_tabFile->GetLayerDefn();
	int ifield,numField = pUGKFeatureDefn->GetFieldCount();
       
	if(numField==1)
	{ 
	    pFeaData->setLabelText(pUGKFeature->GetFieldAsString(0));	    
	}
	else
	{
	    for(ifield=0;ifield<numField;ifield++)
	    {
		if(m_tabFile->GetFieldIndexNumber(ifield) != 0)
		{
		    pFeaData->setLabelText(pUGKFeature->GetFieldAsString(ifield));
		    break;
		}
	    }
	    if(ifield>=numField) //没有字段
		pFeaData->setLabelText("");//
	}
       
	UGKGeometry *m_UGKGeometry = pUGKFeature->GetGeometryRef();
	//====  根据不同几何对象 初始化绘图工具
	TABFeature  *m_TabFeature = (TABFeature *)pUGKFeature;
	double labelX,labelY;
	switch(m_TabFeature->GetFeatureClass())
	{
	      case TABFCNoGeomFeature:
	          //printf("Feature has no Geometry!!!!!!!!!!!\n");
		   delete pFeaData;  //不添加就删除
	          break;
	      case TABFCPoint:	       
	           m_PointFea =(TABPoint *)m_TabFeature;
		   pFeaData->setSymbolDefIndex(m_PointFea->GetSymbolDefIndex() );			   
		   pFeaData->setFeaType(FEA_POINT);
		   labelX = m_PointFea->GetX();
		   labelY = m_PointFea->GetY();
		   pFeaData->setLabelPoint(labelX,labelY);	
		   ReadGeomDataFromFile(m_UGKGeometry,pFeaData);
		   AddFeatureData(pFeaData);
		   break;
	      case TABFCFontPoint:
	      case TABFCCustomPoint:
		   m_FontPointFea =(TABFontPoint *)m_TabFeature;		   
		   pFeaData->setFontDefIndex(m_FontPointFea->GetFontDefIndex() );
		   pFeaData->setFeaType(FEA_FONTPOINT);
		   labelX = m_FontPointFea->GetX();
		   labelY = m_FontPointFea->GetY();
		   pFeaData->setLabelPoint(labelX,labelY);
		   pFeaData->setFontSymbolNo( m_FontPointFea->GetSymbolNo() );
		   pFeaData->setFontPointSize( m_FontPointFea->GetSymbolSize() );
		   pFeaData->setFontColor( m_FontPointFea->GetSymbolColor() );
		   ReadGeomDataFromFile(m_UGKGeometry,pFeaData);
		   AddFeatureData(pFeaData);
		   break;
	      case TABFCText:
		   m_TextFea =(TABText *)m_TabFeature;
		   pFeaData->setLabelText(m_TextFea->GetTextString());
		   pFeaData->setPenDefIndex(m_TextFea->GetPenDefIndex());
		   pFeaData->setFontDefIndex(m_TextFea->GetFontDefIndex());
		   pFeaData->setFeaType(FEA_TEXT);	
		   ReadGeomDataFromFile(m_UGKGeometry,pFeaData);
		   AddFeatureData(pFeaData);
		   break;	
	      
	      case TABFCPolyline:
		   m_PolylineFea =(TABPolyline *)m_TabFeature;
		   pFeaData->setPenDefIndex(m_PolylineFea->GetPenDefIndex() );
		   pFeaData->setFeaType(FEA_LINE);
		   m_PolylineFea->GetCenter(labelX,labelY);
		   pFeaData->setLabelPoint(labelX,labelY);
		   ReadGeomDataFromFile(m_UGKGeometry,pFeaData);
		   AddFeatureData(pFeaData);
		   break;
	      case TABFCRegion:   //=========================
	      case TABFCRectangle: //  暂时对于Reganble Ellipse		   
	      case TABFCEllipse:   //  按照Region来处理
		   m_RegionFea = (TABRegion *)m_TabFeature;
		   pFeaData->setPenDefIndex(m_RegionFea->GetPenDefIndex());
		   pFeaData->setBrushDefIndex(m_RegionFea->GetBrushDefIndex());
		   pFeaData->setFeaType(FEA_REGION);
	      	   m_RegionFea->GetCenter(labelX,labelY);
		   pFeaData->setLabelPoint(labelX,labelY);
		   ReadGeomDataFromFile(m_UGKGeometry,pFeaData);
		   AddFeatureData(pFeaData);
		   break;
		   
	      case TABFCArc:      //暂时不支持  
	      case TABFCMultiPoint: //暂时不支持  
		   printf("Not Supported Now!!\n");
		   delete pFeaData;
		   break;
	      default:
		   delete pFeaData;	    
	} // end switch		
       
    }//end while
   
    printf("Init File success!!!\n");
    b_DataInited = TRUE;
    delete m_tabFile;
    
    return 0;
}

/*******************************************
         判断Feature是否在当前视野内
*******************************************/
bool GUI_Layer::FeatureInView(GUI_FeatureData *feaData)
{
    assert(feaData!=NULL);
    double left,right,top,bottom;
    feaData->getFeaBound(left,right,top,bottom);
    if( ( left-(m_XCenter+m_Xview/2) )>0 )
	return FALSE;
    if( ( right-(m_XCenter-m_Xview/2) )<0 )
	return FALSE;
    if( ( top-(m_YCenter+m_Yview/2) )>0 )
	return FALSE;
    if( ( bottom-(m_YCenter-m_Yview/2) )<0 )
	return FALSE;
    
    return TRUE;
    
}

/*******************************************
         判断此图层是否在当前视野内
*******************************************/
bool GUI_Layer::LayerInView()
{
    if(b_VisibleAllways)
	return TRUE;
    int lyrView = int( (m_Xview<m_Yview)?m_Xview:m_Yview );
    if( (lyrView<m_MinVisibleView)||(lyrView>m_MaxVisibleView) )
        return FALSE;
    else
        return TRUE;
}

/*******************************************
         判断在当前视野内是否需要标记
*******************************************/
bool GUI_Layer::FeatureNeedLabel()
{
    if(!b_Label)
	return FALSE;
    int lyrView = int( (m_Xview<m_Yview)?m_Xview:m_Yview );
    if( (lyrView<m_MinLabelView)||(lyrView>m_MaxLabelView) )
	return FALSE;
    else
	return TRUE;
}

void GUI_Layer::Draw(QPaintDevice *pd)
{
    
    printf("GUI_Layer::Draw\n");
    // 是否可见   
    if(!b_Visible)
	return;
    if(!LayerInView())
	return;

    if( !b_DataInited )
    {  
	printf("File not Inited So Far!!\n");
	//如果没初始化,先初始化
	if(InitDataFromFile() !=0 )
	{
	    printf("GUI_Layer::InitDataFromFile() Failed!\n");
	    return;
	}
	      
    }
    
    
    GUI_FeatureData *singleFea=NULL;
    int countFea = m_AddedFea;
    //printf("Feature numger= %d\n",countFea);
        
    
    for(int i=0;i<countFea;i++)
    {		
	singleFea =*(m_FeaData+i);	
	if(!FeatureInView(singleFea)) //不在视野内
	    continue;
	singleFea->m_ToolDefRef = m_ToolDefTable;	
	singleFea->setScreenCenter(m_XCenter,m_YCenter);
	
	singleFea->setDistPerPixel(m_DistperPixel);
	//告诉GUI_FeatureData 绘图区域
	singleFea->setPaintRect(m_paintTop,m_paintLeft, m_paintWidth, m_paintHeight ); 	
	singleFea->Draw( pd );

    }
    UGKPainter p(pd);
    QPen pen("black");
    p.setPen(pen);
    //=======================================
    //    在所有Feature绘制完后才绘制标记
    //    避免标记被Feature遮挡
    bool bFeaLabel = FeatureNeedLabel();
    singleFea=NULL;
    if(bFeaLabel) //需要标记
    {   
	
	for(int i=0;i<countFea;i++)
	{    
	    singleFea =*(m_FeaData+i);
	    if(!FeatureInView(singleFea)) //不在视野内
		continue;	    
	    if(singleFea->getFeaType()==FEA_TEXT) //文本Feature不需要标记
		continue;
	    if(singleFea->IsTooSmall())  //在改视野中太小
		continue;
	    double lX,lY;
	    singleFea->getLabelPoint(lX,lY);
	    int sx,sy;
	    singleFea->mapCoord2scrCoord(lX,lY,sx,sy);
	    const char *label= singleFea->getLableText();
	    QString labelStr =ACSII2Unicode(label);
	    if( (singleFea->getFeaType()==FEA_POINT) ||
		(singleFea->getFeaType()==FEA_FONTPOINT) )		
		p.drawText(sx-8,sy-8,labelStr);  //点对象 标记时加点偏移
	    else
		p.drawText(sx,sy,labelStr);
	}
    }
    
}