mitab_mapobjectblock.cpp

用于读取TAB、MIF、SHP文件的类

        return -1;

    return 0;
}

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

/**********************************************************************
 *                   TABMAPObjPLine::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 TABMAPObjPLine::ReadObj(TABMAPObjectBlock *poObjBlock)
{
    m_nCoordBlockPtr = poObjBlock->ReadInt32();
    m_nCoordDataSize = poObjBlock->ReadInt32();

    if (m_nCoordDataSize & 0x80000000)
    {
        m_bSmooth = TRUE;
        m_nCoordDataSize &= 0x7FFFFFFF; //Take smooth flag out of the value
    }
    else
    {
        m_bSmooth = FALSE;
    }


    // Number of line segments applies only to MULTIPLINE/REGION but not PLINE
    if (m_nType == TAB_GEOM_PLINE_C ||
        m_nType == TAB_GEOM_PLINE )
    {
        m_numLineSections = 1;
    }
    else
    {
        m_numLineSections = poObjBlock->ReadInt16();
    }

#ifdef TABDUMP
    printf("PLINE/REGION: id=%d, type=%d, "
           "CoordBlockPtr=%d, CoordDataSize=%d, numLineSect=%d, bSmooth=%d\n",
           m_nId, m_nType, m_nCoordBlockPtr, m_nCoordDataSize, 
           m_numLineSections, m_bSmooth);
#endif

    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 (present only in compressed case!)
        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, relative to compr. coord. origin
        // No it's not relative to the Object block center
        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();
    }


    if ( ! IsCompressedType() )
    {
        // 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;
    }

    m_nPenId = poObjBlock->ReadByte();      // Pen index

    if (m_nType == TAB_GEOM_REGION ||
        m_nType == TAB_GEOM_REGION_C ||
        m_nType == TAB_GEOM_V450_REGION ||
        m_nType == TAB_GEOM_V450_REGION_C )
    {
        m_nBrushId = poObjBlock->ReadByte();    // Brush index... REGION only
    }
    else
    {
        m_nBrushId = 0;
    }

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

    return 0;
}


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

    poObjBlock->WriteInt32(m_nCoordBlockPtr);

    // Combine smooth flag in the coord data size.
    if (m_bSmooth)
        poObjBlock->WriteInt32( m_nCoordDataSize | 0x80000000 );
    else
        poObjBlock->WriteInt32( m_nCoordDataSize );

    // Number of line segments applies only to MULTIPLINE/REGION but not PLINE
    if (m_nType != TAB_GEOM_PLINE_C &&
        m_nType != TAB_GEOM_PLINE )
    {
        poObjBlock->WriteInt16(m_numLineSections);
    }

    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);

        // Compressed coordinate origin (present only in compressed case!)
        poObjBlock->WriteInt32(m_nComprOrgX);
        poObjBlock->WriteInt32(m_nComprOrgY);
    }
    else
    {
        // Region center/label point
        poObjBlock->WriteInt32(m_nLabelX);
        poObjBlock->WriteInt32(m_nLabelY);
    }

    // MBR
    if (IsCompressedType())
    {
        // MBR relative to PLINE 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
    {
        poObjBlock->WriteInt32(m_nMinX);
        poObjBlock->WriteInt32(m_nMinY);
        poObjBlock->WriteInt32(m_nMaxX);
        poObjBlock->WriteInt32(m_nMaxY);
    }

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

    if (m_nType == TAB_GEOM_REGION ||
        m_nType == TAB_GEOM_REGION_C ||
        m_nType == TAB_GEOM_V450_REGION ||
        m_nType == TAB_GEOM_V450_REGION_C )
    {
        poObjBlock->WriteByte(m_nBrushId);    // Brush index... REGION only
    }

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

    return 0;
}


/**********************************************************************
 *                   class TABMAPObjPoint
 *
 **********************************************************************/

/**********************************************************************
 *                   TABMAPObjPoint::ReadObj()
 *
 * Read Object information starting after the object id
 **********************************************************************/
int TABMAPObjPoint::ReadObj(TABMAPObjectBlock *poObjBlock)
{
//__TODO__  For now this is read directly in ReadGeometryFromMAPFile()
//          This will be implemented the day we support random update.
    return 0;
}

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

    poObjBlock->WriteIntCoord(m_nX, m_nY, IsCompressedType());

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

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

    return 0;
}


/**********************************************************************
 *                   class TABMAPObjFontPoint
 *
 **********************************************************************/

/**********************************************************************
 *                   TABMAPObjFontPoint::ReadObj()
 *
 * Read Object information starting after the object id
 **********************************************************************/
int TABMAPObjFontPoint::ReadObj(TABMAPObjectBlock *poObjBlock)
{
//__TODO__  For now this is read directly in ReadGeometryFromMAPFile()
//          This will be implemented the day we support random update.
    return 0;
}

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

    poObjBlock->WriteByte(m_nSymbolId);   // symbol shape
    poObjBlock->WriteByte(m_nPointSize);
    poObjBlock->WriteInt16(m_nFontStyle);            // font style

    poObjBlock->WriteByte( m_nR );
    poObjBlock->WriteByte( m_nG );
    poObjBlock->WriteByte( m_nB );

    poObjBlock->WriteByte( 0 );
    poObjBlock->WriteByte( 0 );
    poObjBlock->WriteByte( 0 );
    
    poObjBlock->WriteInt16(m_nAngle);

    poObjBlock->WriteIntCoord(m_nX, m_nY, IsCompressedType());

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

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

    return 0;
}


/**********************************************************************
 *                   class TABMAPObjCustomPoint
 *
 **********************************************************************/

/**********************************************************************
 *                   TABMAPObjCustomPoint::ReadObj()
 *
 * Read Object information starting after the object id
 **********************************************************************/
int TABMAPObjCustomPoint::ReadObj(TABMAPObjectBlock *poObjBlock)
{
//__TODO__  For now this is read directly in ReadGeometryFromMAPFile()
//          This will be implemented the day we support random update.
    return 0;
}

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

    poObjBlock->WriteByte(m_nUnknown_);  // ??? 
    poObjBlock->WriteByte(m_nCustomStyle); // 0x01=Show BG, 0x02=Apply Color
    poObjBlock->WriteIntCoord(m_nX, m_nY, IsCompressedType());

    poObjBlock->WriteByte(m_nSymbolId);      // Symbol index
    poObjBlock->WriteByte(m_nFontId);      // Font index

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

    return 0;
}

/**********************************************************************
 *                   class TABMAPObjRectEllipse
 *
 **********************************************************************/

/**********************************************************************
 *                   TABMAPObjRectEllipse::ReadObj()
 *
 * Read Object information starting after the object id
 **********************************************************************/
int TABMAPObjRectEllipse::ReadObj(TABMAPObjectBlock *poObjBlock)
{
//__TODO__  For now this is read directly in ReadGeometryFromMAPFile()
//          This will be implemented the day we support random update.
    return 0;
}

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

    if (m_nType == TAB_GEOM_ROUNDRECT || 
        m_nType == TAB_GEOM_ROUNDRECT_C)
    {
        if (IsCompressedType())
        {
            poObjBlock->WriteInt16(m_nCornerWidth);
            poObjBlock->WriteInt16(m_nCornerHeight);
        }
        else
        {
            poObjBlock->WriteInt32(m_nCornerWidth);
            poObjBlock->WriteInt32(m_nCornerHeight);
        }
    }

    poObjBlock->WriteIntMBRCoord(m_nMinX, m_nMinY, m_nMaxX, m_nMaxY, 
                                 IsCompressedType());

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

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

    return 0;
}


/**********************************************************************
 *                   class TABMAPObjArc
 *
 **********************************************************************/

/**********************************************************************
 *                   TABMAPObjArc::ReadObj()
 *
 * Read Object information starting after the object id
 **********************************************************************/
int TABMAPObjArc::ReadObj(TABMAPObjectBlock *poObjBlock)
{
//__TODO__  For now this is read directly in ReadGeometryFromMAPFile()
//          This will be implemented the day we support random update.
    return 0;
}

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

    poObjBlock->WriteInt16(m_nStartAngle);
    poObjBlock->WriteInt16(m_nEndAngle);
    
    // An arc is defined by its defining ellipse's MBR:
    poObjBlock->WriteIntMBRCoord(m_nArcEllipseMinX, m_nArcEllipseMinY,