ossimTiledImageHash Class Reference

#include <ossimTiledImageHash.h>

Inheritance diagram for ossimTiledImageHash:

Public Member Functions
	ossimTiledImageHash (const ossimDrect &imageRect, double tileWidth, double tileHeight)
virtual	~ossimTiledImageHash ()
virtual long	operator() (const ossimDpt &aPoint)
virtual long	operator() (const ossimFpt &aPoint)
Public Member Functions inherited from ossimPointHash
virtual	~ossimPointHash ()

Private Attributes
ossimDrect	theImageRect
double	theTileWidth
double	theTileHeight
long	theNumberOfHorizTiles
long	theNumberOfVertTiles

Detailed Description

Definition at line 20 of file ossimTiledImageHash.h.

Constructor & Destructor Documentation

ossimTiledImageHash()

ossimTiledImageHash::ossimTiledImageHash	(	const ossimDrect &	imageRect,
		double	tileWidth,
		double	tileHeight
	)

Definition at line 21 of file ossimTiledImageHash.cpp.

References FLT_EPSILON, ossimDrect::height(), theImageRect, theNumberOfHorizTiles, theNumberOfVertTiles, theTileHeight, theTileWidth, and ossimDrect::width().

   :ossimPointHash(),
    theImageRect(imageRect)
{
   // make sure that the width of the tile is not larger than
   // the width of the image rectangle.
   if(theImageRect.width() < tileWidth)
   {
      theTileWidth = theImageRect.width();
      theNumberOfHorizTiles = 1;
   }
   else
   {
      theTileWidth          = tileWidth;
      double tempDiv        = theImageRect.width()/theTileWidth;
      double overFlow       = tempDiv  - static_cast<long>(tempDiv);
      theNumberOfHorizTiles = static_cast<long>(tempDiv);
      
      if(fabs(overFlow) >= FLT_EPSILON) // if the extent went beyond a tile
      {
         theNumberOfHorizTiles ++;      // we must say it has another tile
      }
   }

   // make sure the height of the tile is not larger than the
   // height of the image rectangle.
   if(theImageRect.height() < tileHeight)
   {
      theTileHeight = theImageRect.height();
      theNumberOfVertTiles = 1;
   }
   else
   {
      theTileHeight         = tileHeight;
      double tempDiv        = theImageRect.height()/theTileHeight;
      double overFlow       = tempDiv  - static_cast<long>(tempDiv);
      theNumberOfVertTiles = static_cast<long>(tempDiv);

      if(fabs(overFlow) >= FLT_EPSILON) // if the extent went beyond a tile
      {
         theNumberOfVertTiles ++;      // we must say it has another tile
      }
   }

}

~ossimTiledImageHash()

ossimTiledImageHash::~ossimTiledImageHash ( )

virtual

Definition at line 69 of file ossimTiledImageHash.cpp.

{
}

Member Function Documentation

operator()() [1/2]

long ossimTiledImageHash::operator() ( const ossimDpt &  aPoint )

virtual

Implements ossimPointHash.

Definition at line 73 of file ossimTiledImageHash.cpp.

References theImageRect, theNumberOfHorizTiles, theNumberOfVertTiles, theTileHeight, theTileWidth, ossimDrect::ul(), ossimDpt::x, and ossimDpt::y.

{
   if(aPoint.x >= theImageRect.ul().x && aPoint.y >= theImageRect.ul().y)
   {
      // how far is the point horizontally  from the upper left corner
      double deltaWidth  = aPoint.x - theImageRect.ul().x;

      // how far is the point vertically from the upper left point
      double deltaHeight = aPoint.y - theImageRect.ul().y;

      // if deltas are negative then we are outside the
      // bounds
      if((deltaWidth < 0) || (deltaHeight < 0)) 
      {
         return -1;
      }

      // check if outside the rectangle
      if( (deltaWidth > theNumberOfHorizTiles*theTileWidth)||
          (deltaHeight > theNumberOfVertTiles*theTileHeight))
      {
         return -1;
      }
      // solve the horizontal and vertical index numbers
      long indexWidth  = static_cast<long>(deltaWidth  / theTileWidth);
      long indexHeight = static_cast<long>(deltaHeight / theTileHeight);

      // map to a linear array.  Just like you would index a 2-D array in memory
      return static_cast<long>(theNumberOfHorizTiles*indexHeight + indexWidth);
   }

   return -1;
}

operator()() [2/2]

long ossimTiledImageHash::operator() ( const ossimFpt &  aPoint )

virtual

Implements ossimPointHash.

Definition at line 107 of file ossimTiledImageHash.cpp.

References theImageRect, theNumberOfHorizTiles, theNumberOfVertTiles, theTileHeight, theTileWidth, ossimDrect::ul(), ossimFpt::x, ossimDpt::x, ossimFpt::y, and ossimDpt::y.

{
   if(aPoint.x >= theImageRect.ul().x && aPoint.y >= theImageRect.ul().y)
   {
      // how far is the point horizontally  from the upper left corner
      double deltaWidth  = aPoint.x - theImageRect.ul().x;

      // how far is the point vertically from the upper left point
      double deltaHeight = aPoint.y - theImageRect.ul().y;

      // if deltas are negative then we are outside the
      // bounds
      if((deltaWidth < 0) || (deltaHeight < 0)) 
      {
         return -1;
      }

      // check if outside the rectangle
      if( (deltaWidth > theNumberOfHorizTiles*theTileWidth)||
          (deltaHeight > theNumberOfVertTiles*theTileHeight))
      {
         return -1;
      }
      // solve the horizontal and vertical index numbers
      long indexWidth  = static_cast<long>(deltaWidth  / theTileWidth);
      long indexHeight = static_cast<long>(deltaHeight / theTileHeight);

      // map to a linear array.  Just like you would index a 2-D array in memory
      return static_cast<long>(theNumberOfHorizTiles*indexHeight + indexWidth);
   }

   return -1;
}

Member Data Documentation

theImageRect

ossimDrect ossimTiledImageHash::theImageRect

private

Definition at line 33 of file ossimTiledImageHash.h.

Referenced by operator()(), and ossimTiledImageHash().

theNumberOfHorizTiles

long ossimTiledImageHash::theNumberOfHorizTiles

private

Definition at line 36 of file ossimTiledImageHash.h.

Referenced by operator()(), and ossimTiledImageHash().

theNumberOfVertTiles

long ossimTiledImageHash::theNumberOfVertTiles

private

Definition at line 37 of file ossimTiledImageHash.h.

Referenced by operator()(), and ossimTiledImageHash().

theTileHeight

double ossimTiledImageHash::theTileHeight

private

Definition at line 35 of file ossimTiledImageHash.h.

Referenced by operator()(), and ossimTiledImageHash().

theTileWidth

double ossimTiledImageHash::theTileWidth

private

Definition at line 34 of file ossimTiledImageHash.h.

Referenced by operator()(), and ossimTiledImageHash().

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The documentation for this class was generated from the following files:

• ossimTiledImageHash.h
• ossimTiledImageHash.cpp