ossimTileHash Class Reference

#include <ossimTileHash.h>

Inheritance diagram for ossimTileHash:

Public Member Functions
	ossimTileHash (const ossimDrect &imageRect, double tileWidth, double tileHeight)
virtual	~ossimTileHash ()
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 26 of file ossimTileHash.h.

Constructor & Destructor Documentation

ossimTileHash()

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

Definition at line 23 of file ossimTileHash.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
      }
   }
}

~ossimTileHash()

ossimTileHash::~ossimTileHash ( )

virtual

Definition at line 71 of file ossimTileHash.cpp.

{
}

Member Function Documentation

operator()() [1/2]

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

virtual

Implements ossimPointHash.

Definition at line 100 of file ossimTileHash.cpp.

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

{
   if ( (aPoint.x >= theImageRect.ul().x) &&
        (aPoint.x <= theImageRect.lr().x) &&
        (aPoint.y <= theImageRect.ul().y) &&
        (aPoint.y >= theImageRect.lr().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 = theImageRect.ul().y - aPoint.y;

      // 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 ossimTileHash::operator() ( const ossimFpt &  aPoint )

virtual

Implements ossimPointHash.

Definition at line 75 of file ossimTileHash.cpp.

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

{
   if ( (aPoint.x >= theImageRect.ul().x) &&
        (aPoint.x <= theImageRect.lr().x) &&
        (aPoint.y <= theImageRect.ul().y) &&
        (aPoint.y >= theImageRect.lr().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 = theImageRect.ul().y - aPoint.y;

      // 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 ossimTileHash::theImageRect

private

Definition at line 39 of file ossimTileHash.h.

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

theNumberOfHorizTiles

long ossimTileHash::theNumberOfHorizTiles

private

Definition at line 42 of file ossimTileHash.h.

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

theNumberOfVertTiles

long ossimTileHash::theNumberOfVertTiles

private

Definition at line 43 of file ossimTileHash.h.

Referenced by ossimTileHash().

theTileHeight

double ossimTileHash::theTileHeight

private

Definition at line 41 of file ossimTileHash.h.

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

theTileWidth

double ossimTileHash::theTileWidth

private

Definition at line 40 of file ossimTileHash.h.

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

---

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

• ossimTileHash.h
• ossimTileHash.cpp