mitab_mapobjectblock.cpp

mitab,读取MapInfo的地图文件

 **********************************************************************/
int TABMAPObjText::WriteObj(TABMAPObjectBlock *poObjBlock)
{
    // Write object type and id
    TABMAPObjHdr::WriteObjTypeAndId(poObjBlock);

    poObjBlock->WriteInt32(m_nCoordBlockPtr);     // String position
    poObjBlock->WriteInt16(m_nCoordDataSize);     // String length
    poObjBlock->WriteInt16(m_nTextAlignment);     // just./spacing/arrow

    poObjBlock->WriteInt16(m_nAngle);             // Tenths of degree

    poObjBlock->WriteInt16(m_nFontStyle);         // Font style/effect

    poObjBlock->WriteByte(m_nFGColorR );
    poObjBlock->WriteByte(m_nFGColorG );
    poObjBlock->WriteByte(m_nFGColorB );

    poObjBlock->WriteByte(m_nBGColorR );
    poObjBlock->WriteByte(m_nBGColorG );
    poObjBlock->WriteByte(m_nBGColorB );

    // Label line end point
    poObjBlock->WriteIntCoord(m_nLineEndX, m_nLineEndY, IsCompressedType());

    // Text Height
    if (IsCompressedType())
        poObjBlock->WriteInt16(m_nHeight);
    else
        poObjBlock->WriteInt32(m_nHeight);

    // Font name
    poObjBlock->WriteByte(m_nFontId);      // Font name index

    // MBR after rotation
    poObjBlock->WriteIntMBRCoord(m_nMinX, m_nMinY, m_nMaxX, m_nMaxY, 
                                 IsCompressedType());

    poObjBlock->WriteByte(m_nPenId);      // Pen index

    if (CPLGetLastErrorNo() != 0)
        return -1;

    return 0;
}

/**********************************************************************
 *                   class TABMAPObjMultiPoint
 *
 * Applies to PLINE, MULTIPLINE and REGION object types
 **********************************************************************/

/**********************************************************************
 *                   TABMAPObjMultiPoint::ReadObj()
 *
 * Read Object information starting after the object id which should 
 * have been read by TABMAPObjHdr::ReadNextObj() already.
 * This function should be called only by TABMAPObjHdr::ReadNextObj().
 *
 * Returns 0 on success, -1 on error.
 **********************************************************************/
int TABMAPObjMultiPoint::ReadObj(TABMAPObjectBlock *poObjBlock)
{
    m_nCoordBlockPtr = poObjBlock->ReadInt32();
    m_nNumPoints = poObjBlock->ReadInt32();

    if (IsCompressedType())
    {
        m_nCoordDataSize = m_nNumPoints * 2 * 2;
    }
    else
    {
        m_nCoordDataSize = m_nNumPoints * 2 * 4;
    }


#ifdef TABDUMP
    printf("MULTIPOINT: id=%d, type=%d, "
           "CoordBlockPtr=%d, CoordDataSize=%d, numPoints=%d\n",
           m_nId, m_nType, m_nCoordBlockPtr, m_nCoordDataSize, m_nNumPoints);
#endif

    // ?????
    poObjBlock->ReadInt32();
    poObjBlock->ReadInt32();
    poObjBlock->ReadInt32();
    poObjBlock->ReadByte();
    poObjBlock->ReadByte();
    poObjBlock->ReadByte();

    if (m_nType == TAB_GEOM_V800_MULTIPOINT ||
        m_nType == TAB_GEOM_V800_MULTIPOINT_C )
    {
        /* V800 MULTIPOINTS have another 33 unknown bytes... all zeros */
        poObjBlock->ReadInt32();
        poObjBlock->ReadInt32();
        poObjBlock->ReadInt32();
        poObjBlock->ReadInt32();
        poObjBlock->ReadInt32();
        poObjBlock->ReadInt32();
        poObjBlock->ReadInt32();
        poObjBlock->ReadInt32();
        poObjBlock->ReadByte();
    }

    m_nSymbolId = poObjBlock->ReadByte();

    // ?????
    poObjBlock->ReadByte();

    if (IsCompressedType())
    {
        // Region center/label point, relative to compr. coord. origin
        // No it's not relative to the Object block center
        m_nLabelX = poObjBlock->ReadInt16();
        m_nLabelY = poObjBlock->ReadInt16();

        // Compressed coordinate origin
        m_nComprOrgX = poObjBlock->ReadInt32();
        m_nComprOrgY = poObjBlock->ReadInt32();

        m_nLabelX += m_nComprOrgX;
        m_nLabelY += m_nComprOrgY;

        m_nMinX = m_nComprOrgX + poObjBlock->ReadInt16();  // Read MBR
        m_nMinY = m_nComprOrgY + poObjBlock->ReadInt16();
        m_nMaxX = m_nComprOrgX + poObjBlock->ReadInt16();
        m_nMaxY = m_nComprOrgY + poObjBlock->ReadInt16();
    }
    else
    {
        // Region center/label point
        m_nLabelX = poObjBlock->ReadInt32();
        m_nLabelY = poObjBlock->ReadInt32();

        m_nMinX = poObjBlock->ReadInt32();    // Read MBR
        m_nMinY = poObjBlock->ReadInt32();
        m_nMaxX = poObjBlock->ReadInt32();
        m_nMaxY = poObjBlock->ReadInt32();

        // Init. Compr. Origin to a default value in case type is ever changed
        m_nComprOrgX = (m_nMinX + m_nMaxX) / 2;
        m_nComprOrgY = (m_nMinY + m_nMaxY) / 2;
    }

    if (CPLGetLastErrorNo() != 0)
        return -1;

    return 0;
}


/**********************************************************************
 *                   TABMAPObjMultiPoint::WriteObj()
 *
 * Write Object information with the type+object id
 *
 * Returns 0 on success, -1 on error.
 **********************************************************************/
int TABMAPObjMultiPoint::WriteObj(TABMAPObjectBlock *poObjBlock)
{
    // Write object type and id
    TABMAPObjHdr::WriteObjTypeAndId(poObjBlock);

    poObjBlock->WriteInt32(m_nCoordBlockPtr);

    // Number of points
    poObjBlock->WriteInt32(m_nNumPoints);

    //  unknown bytes
    poObjBlock->WriteZeros(15);

    if (m_nType == TAB_GEOM_V800_MULTIPOINT ||
        m_nType == TAB_GEOM_V800_MULTIPOINT_C )
    {
        /* V800 MULTIPOINTS have another 33 unknown bytes... all zeros */
        poObjBlock->WriteZeros(33);
    }

    // Symbol Id
    poObjBlock->WriteByte(m_nSymbolId);

    // ????
    poObjBlock->WriteByte(0);

    // MBR
    if (IsCompressedType())
    {
        // Region center/label point, relative to compr. coord. origin
        // No it's not relative to the Object block center
        poObjBlock->WriteInt16(m_nLabelX - m_nComprOrgX);
        poObjBlock->WriteInt16(m_nLabelY - m_nComprOrgY);

        poObjBlock->WriteInt32(m_nComprOrgX);
        poObjBlock->WriteInt32(m_nComprOrgY);

        // MBR relative to object origin (and not object block center)
        poObjBlock->WriteInt16(m_nMinX - m_nComprOrgX);
        poObjBlock->WriteInt16(m_nMinY - m_nComprOrgY);
        poObjBlock->WriteInt16(m_nMaxX - m_nComprOrgX);
        poObjBlock->WriteInt16(m_nMaxY - m_nComprOrgY);
    }
    else
    {
        // Region center/label point
        poObjBlock->WriteInt32(m_nLabelX);
        poObjBlock->WriteInt32(m_nLabelY);

        poObjBlock->WriteInt32(m_nMinX);
        poObjBlock->WriteInt32(m_nMinY);
        poObjBlock->WriteInt32(m_nMaxX);
        poObjBlock->WriteInt32(m_nMaxY);
    }

    if (CPLGetLastErrorNo() != 0)
        return -1;

    return 0;
}

/**********************************************************************
 *                   class TABMAPObjCollection
 *
 **********************************************************************/

/**********************************************************************
 *                   TABMAPObjCollection::ReadObj()
 *
 * Read Object information starting after the object id which should 
 * have been read by TABMAPObjHdr::ReadNextObj() already.
 * This function should be called only by TABMAPObjHdr::ReadNextObj().
 *
 * Returns 0 on success, -1 on error.
 **********************************************************************/
int TABMAPObjCollection::ReadObj(TABMAPObjectBlock *poObjBlock)
{
    int SIZE_OF_REGION_PLINE_MINI_HDR = 24, SIZE_OF_MPOINT_MINI_HDR = 24;
    int nVersion = TAB_GEOM_GET_VERSION(m_nType);

    /* Figure the size of the mini-header that we find for each of the
     * 3 optional components (center x,y and mbr)
     */
    if (IsCompressedType())
    {
        /* 6 * int16 */
        SIZE_OF_REGION_PLINE_MINI_HDR = SIZE_OF_MPOINT_MINI_HDR = 12; 
    }
    else
    {
        /* 6 * int32 */
        SIZE_OF_REGION_PLINE_MINI_HDR = SIZE_OF_MPOINT_MINI_HDR = 24;
    }
  
    if (nVersion >= 800)
    {
        /* extra 4 bytes for num_segments in Region/Pline mini-headers */
        SIZE_OF_REGION_PLINE_MINI_HDR += 4;  
    }

    m_nCoordBlockPtr = poObjBlock->ReadInt32();    // pointer into coord block
    m_nNumMultiPoints = poObjBlock->ReadInt32();   // no. points in multi point
    m_nRegionDataSize = poObjBlock->ReadInt32();   // size of region data inc. section hdrs
    m_nPolylineDataSize = poObjBlock->ReadInt32(); // size of multipline data inc. section hdrs

    if (nVersion < 800)
    {
        // Num Region/Pline section headers (int16 in V650)
        m_nNumRegSections = poObjBlock->ReadInt16();   
        m_nNumPLineSections = poObjBlock->ReadInt16();
    }
    else
    {
        // Num Region/Pline section headers (int32 in V800)
        m_nNumRegSections = poObjBlock->ReadInt32();   
        m_nNumPLineSections = poObjBlock->ReadInt32();
    }


    if (IsCompressedType())
    {
        m_nMPointDataSize = m_nNumMultiPoints * 2 * 2;
    }
    else
    {
        m_nMPointDataSize = m_nNumMultiPoints * 2 * 4;
    }

    /* NB. MapInfo counts 2 extra bytes per Region and Pline section header
     * in the RegionDataSize and PolylineDataSize values but those 2 extra 
     * bytes are not present in the section hdr (possibly due to an alignment
     * to a 4 byte boundary in memory in MapInfo?). The real data size in 
     * the CoordBlock is actually 2 bytes shorter per section header than 
     * what is written in RegionDataSize and PolylineDataSize values.
     *
     * We'll adjust the values in memory to be the corrected values.
     */
    m_nRegionDataSize   = m_nRegionDataSize - (2 * m_nNumRegSections);
    m_nPolylineDataSize = m_nPolylineDataSize - (2 * m_nNumPLineSections);

    /* Compute total coord block data size, required when splitting blocks */
    m_nCoordDataSize = 0;

    if(m_nNumRegSections > 0)
    {
        m_nCoordDataSize += SIZE_OF_REGION_PLINE_MINI_HDR + m_nRegionDataSize;
    }
    if(m_nNumPLineSections > 0)
    {
        m_nCoordDataSize += SIZE_OF_REGION_PLINE_MINI_HDR + m_nPolylineDataSize;
    }
    if(m_nNumMultiPoints > 0)
    {
        m_nCoordDataSize += SIZE_OF_MPOINT_MINI_HDR + m_nMPointDataSize;
    }


#ifdef TABDUMP
    printf("COLLECTION: id=%d, type=%d (0x%x), "
           "CoordBlockPtr=%d, numRegionSections=%d (size=%d+%d), "
           "numPlineSections=%d (size=%d+%d), numPoints=%d (size=%d+%d)\n",
           m_nId, m_nType, m_nType, m_nCoordBlockPtr, 
           m_nNumRegSections, m_nRegionDataSize, SIZE_OF_REGION_PLINE_MINI_HDR,
           m_nNumPLineSections, m_nPolylineDataSize, SIZE_OF_REGION_PLINE_MINI_HDR,
           m_nNumMultiPoints, m_nMPointDataSize, SIZE_OF_MPOINT_MINI_HDR);
#endif

    if (nVersion >= 800)
    {
        // Extra byte in V800 files... value always 4???
        int nValue = poObjBlock->ReadByte();
        if (nValue != 4)
        {
            CPLError(CE_Failure, CPLE_AssertionFailed, 
                     "TABMAPObjCollection::ReadObj(): Byte 29 in Collection "
                     "object header not equal to 4 as expected. Value is %d. "
                     "Please report this error to the MITAB list so that "
                     "MITAB can be extended to support this case.",
                     nValue);
            // We don't return right away, the error should be caught at the
            // end of this function.
        }
    }

    // ??? All zeros ???
    poObjBlock->ReadInt32();
    poObjBlock->ReadInt32();
    poObjBlock->ReadInt32();
    poObjBlock->ReadByte();
    poObjBlock->ReadByte();
    poObjBlock->ReadByte();

    m_nMultiPointSymbolId = poObjBlock->ReadByte();

    poObjBlock->ReadByte();  // ???
    m_nRegionPenId = poObjBlock->ReadByte();
    m_nPolylinePenId = poObjBlock->ReadByte();
    m_nRegionBrushId = poObjBlock->ReadByte();

    if (IsCompressedType())
    {
#ifdef TABDUMP
    printf("COLLECTION: READING ComprOrg @ %d\n",
           poObjBlock->GetCurAddress());
#endif
        // Compressed coordinate origin
        m_nComprOrgX = poObjBlock->ReadInt32();
        m_nComprOrgY = poObjBlock->ReadInt32();

        m_nMinX = m_nComprOrgX + poObjBlock->ReadInt16();  // Read MBR
        m_nMinY = m_nComprOrgY + poObjBlock->ReadInt16();
        m_nMaxX = m_nComprOrgX + poObjBlock->ReadInt16();
        m_nMaxY = m_nComprOrgY + poObjBlock->ReadInt16();
#ifdef TABDUMP
    printf("COLLECTION: ComprOrgX,Y= (%d,%d)\n",
           m_nComprOrgX, m_nComprOrgY);
#endif
    }
    else
    {
        m_nMinX = poObjBlock->ReadI