tabmapobjhdr.cpp

linux下一款GIS程序源码

// tabmapobjhdr.cpp: implementation of the TABMAPObjHdr class.
//
//////////////////////////////////////////////////////////////////////

#include "tabmapobjhdr.h"

#include "ugk_errhandle.h"


#include "tabmapobjnone.h"
#include "tabmapobjpoint.h"
#include "tabmapobjfontpoint.h"
#include "tabmapobjcustompoint.h"
#include "tabmapobjline.h"
#include "tabmapobjpline.h"
#include "tabmapobjarc.h"
#include "tabmapobjrectellipse.h"
#include "tabmapobjtext.h"
#include "tabmapobjmultipoint.h"

/**********************************************************************
 *                    TABMAPObjHdr::NewObj()
 *
 * Alloc a new object of specified type or NULL for NONE types or if type 
 * is not supported.
 **********************************************************************/
TABMAPObjHdr *TABMAPObjHdr::NewObj(UGKByte nNewObjType, UGKInt32 nId /*=0*/)
{
    TABMAPObjHdr *poObj = NULL;

    switch(nNewObjType)
    {
      case TAB_GEOM_NONE:
        poObj = new TABMAPObjNone;
        break;
      case TAB_GEOM_SYMBOL_C:
      case TAB_GEOM_SYMBOL:
        poObj = new TABMAPObjPoint;
        break;
      case TAB_GEOM_FONTSYMBOL_C:
      case TAB_GEOM_FONTSYMBOL:
        poObj = new TABMAPObjFontPoint;
        break;
      case TAB_GEOM_CUSTOMSYMBOL_C:
      case TAB_GEOM_CUSTOMSYMBOL:
        poObj = new TABMAPObjCustomPoint;
        break;
      case TAB_GEOM_LINE_C:
      case TAB_GEOM_LINE:
        poObj = new TABMAPObjLine;
        break;
      case TAB_GEOM_PLINE_C:
      case TAB_GEOM_PLINE:
      case TAB_GEOM_REGION_C:
      case TAB_GEOM_REGION:
      case TAB_GEOM_MULTIPLINE_C:
      case TAB_GEOM_MULTIPLINE:
      case TAB_GEOM_V450_REGION_C:
      case TAB_GEOM_V450_REGION:
      case TAB_GEOM_V450_MULTIPLINE_C:
      case TAB_GEOM_V450_MULTIPLINE:
        poObj = new TABMAPObjPLine;
        break;
      case TAB_GEOM_ARC_C:
      case TAB_GEOM_ARC:
        poObj = new TABMAPObjArc;
        break;
      case TAB_GEOM_RECT_C:
      case TAB_GEOM_RECT:
      case TAB_GEOM_ROUNDRECT_C:
      case TAB_GEOM_ROUNDRECT:
      case TAB_GEOM_ELLIPSE_C:
      case TAB_GEOM_ELLIPSE:
        poObj = new TABMAPObjRectEllipse;
        break;
      case TAB_GEOM_TEXT_C:
      case TAB_GEOM_TEXT:
        poObj = new TABMAPObjText;
        break;
      case TAB_GEOM_MULTIPOINT_C:
      case TAB_GEOM_MULTIPOINT:
        poObj = new TABMAPObjMultiPoint;
        break;
      default:
        UGKError(ET_Failure, UGKErr_AssertionFailed, 
                  "TABMAPObjHdr::NewObj(): Unsupported object type %d",
                  nNewObjType);
		  
    }

    if (poObj)
    {
        poObj->m_nType = nNewObjType;
        poObj->m_nId = nId;
        poObj->m_nMinX = poObj->m_nMinY = poObj->m_nMaxX = poObj->m_nMaxY = 0;
    }

    return poObj;
}


/**********************************************************************
 *                    TABMAPObjHdr::ReadNextObj()
 *
 * Read next object in this block and allocate/init a new object for it
 * if succesful.  
 * Returns NULL in case of error or if we reached end of block.
 **********************************************************************/
TABMAPObjHdr *TABMAPObjHdr::ReadNextObj(TABMAPObjectBlock *poObjBlock,
                                        TABMAPHeaderBlock *poHeader)
{
    TABMAPObjHdr *poObjHdr = NULL;

    if (poObjBlock->AdvanceToNextObject(poHeader) != -1)
    {
        poObjHdr=TABMAPObjHdr::NewObj(poObjBlock->GetCurObjectType());
        if (poObjHdr &&
            ((poObjHdr->m_nId = poObjBlock->GetCurObjectId()) == -1 ||
             poObjHdr->ReadObj(poObjBlock) != 0 ) )
        {
            // Failed reading object in block... an error was already produced
            delete poObjHdr;
            return NULL;
        }
    }

    return poObjHdr;
}


/**********************************************************************
 *                    TABMAPObjHdr::IsCompressedType()
 *
 * Returns TRUE if the current object type uses compressed coordinates
 * or FALSE otherwise.
 **********************************************************************/
UGKBool TABMAPObjHdr::IsCompressedType()
{
    // Compressed types are 1, 4, 7, etc.
    return ((m_nType % 3) == 1 ? TRUE : FALSE);
}



/**********************************************************************
 *                   TABMAPObjHdr::WriteObjTypeAndId()
 *
 * Writetype+object id information... should be called only by the derived
 * classes' WriteObj() methods.
 *
 * Returns 0 on success, -1 on error.
 **********************************************************************/
int TABMAPObjHdr::WriteObjTypeAndId(TABMAPObjectBlock *poObjBlock)
{
    poObjBlock->WriteByte(m_nType);
    return poObjBlock->WriteInt32(m_nId);
}



/**********************************************************************
 *                   TABMAPObjHdr::SetMBR()
 *
 **********************************************************************/
void TABMAPObjHdr::SetMBR(UGKInt32 nMinX, UGKInt32 nMinY, 
                          UGKInt32 nMaxX, UGKInt32 nMaxY)
{
    m_nMinX = MIN(nMinX, nMaxX);
    m_nMinY = MIN(nMinY, nMaxY);
    m_nMaxX = MAX(nMinX, nMaxX);
    m_nMaxY = MAX(nMinY, nMaxY);
}