tabmapobjectblock.h

linux下一款GIS程序源码

// tabmapobjectblock.h: interface for the TABMAPObjectBlock class.
//
/*---------------------------------------------------------------------
 *                      class TABMAPObjectBlock
 *
 * Class to handle Read/Write operation on .MAP Object data Blocks (Type 02)
 *--------------------------------------------------------------------*/

#ifndef  TABMAPObjectBlock_H
#define  TABMAPObjectBlock_H

#include "tabmapheaderblock.h"
#include "tabrawbinblock.h"
class TABMAPObjHdr;

class TABMAPObjectBlock : public TABRawBinBlock  
{
protected:
    int         m_numDataBytes; /* Excluding first 4 bytes header */
    UGKInt32      m_nFirstCoordBlock;
    UGKInt32      m_nLastCoordBlock;
    UGKInt32      m_nCenterX;
    UGKInt32      m_nCenterY;

    // In order to compute block center, we need to keep track of MBR
    UGKInt32      m_nMinX;
    UGKInt32      m_nMinY;
    UGKInt32      m_nMaxX;
    UGKInt32      m_nMaxY;

    int         m_nCurObjectOffset; // -1 if there is no current object.
    int         m_nCurObjectId;     // -1 if there is no current object.
    int         m_nCurObjectType;   // -1 if there is no current object.

    // Array of object headers held in memory until CommitToFile() is called
    TABMAPObjHdr **m_papoObjHdr;
    int         m_numObjects;

    void        FreeObjectArray();

public:
	TABMAPObjectBlock(TABAccess eAccessMode = TABRead);
	virtual ~TABMAPObjectBlock();

	virtual int CommitToFile();
    virtual int InitBlockFromData(UGKByte *pabyBuf, int nSize, 
                              UGKBool bMakeCopy = TRUE,
                              FILE *fpSrc = NULL, int nOffset = 0);
    virtual int InitNewBlock(FILE *fpSrc, int nBlockSize, int nFileOffset=0);

	virtual int GetBlockClass() { return TABMAP_OBJECT_BLOCK; };

    virtual int ReadIntCoord(UGKBool bCompressed, UGKInt32 &nX, UGKInt32 &nY);
    int         WriteIntCoord(UGKInt32 nX, UGKInt32 nY, UGKBool bCompressed);
    int         WriteIntMBRCoord(UGKInt32 nXMin, UGKInt32 nYMin,
                                 UGKInt32 nXMax, UGKInt32 nYMax,
                                 UGKBool bCompressed);
	int         UpdateMBR(UGKInt32 nX, UGKInt32 nY);

	int         AddObject(TABMAPObjHdr *poObjHdr);

	void        AddCoordBlockRef(UGKInt32 nCoordBlockAddress);

    void        GetMBR(UGKInt32 &nXMin, UGKInt32 &nYMin, 
                       UGKInt32 &nXMax, UGKInt32 &nYMax);

    int         AdvanceToNextObject( TABMAPHeaderBlock * );
    int         GetCurObjectOffset() { return m_nCurObjectOffset; }
    int         GetCurObjectId() { return m_nCurObjectId; }
    int         GetCurObjectType() { return m_nCurObjectType; }


	virtual void Dump(FILE *fpOut = NULL) { Dump(fpOut, FALSE); };
    void Dump(FILE *fpOut, UGKBool bDetails);
};

#endif