SourceGridFloat Class Reference

Interface to a data source. Sources can be asked to fill Point objects with any available data. Specifically handles data files in grid float format, usually ending with ".flt" extension. More...

#include <source.h>

Inheritance diagram for SourceGridFloat:

List of all members.

Public Member Functions
	SourceGridFloat (Convert *convert, int type, string filename, bool cache)
	SourceGridFloat (Convert *convert, int type, string filename, int _ncols, int _nrows, double _left, double _bottom, double _cellsize)
	~SourceGridFloat ()
void	resolve (Point *p)
Protected Member Functions
double	value (int offset)
Protected Attributes
double *	cache
	Internal cache of entire data file, if requested.

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Detailed Description

Interface to a data source. Sources can be asked to fill Point objects with any available data. Specifically handles data files in grid float format, usually ending with ".flt" extension.

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Constructor & Destructor Documentation

SourceGridFloat::SourceGridFloat	(	Convert *	convert,
		int	type,
		string	filename,
		bool	cache
	)

Create a new grid float data source.

Parameters:

	convert	The conversion to apply to all incoming points
	type	Enumeration value describing the type of data we provide
	filename	Filename pointing to ".hdr" file for this data source
	cache	Cache entire data file in memory if true, otherwise read directly from file when requested

SourceGridFloat::SourceGridFloat	(	Convert *	convert,
		int	type,
		string	filename,
		int	_ncols,
		int	_nrows,
		double	_left,
		double	_bottom,
		double	_cellsize
	)

Create a new grid float data source. This constructor is specifically used to bypass reading the ".hdr" header file, which can save time when using large numbers of data source tiles.

Parameters:

	convert	The conversion to apply to all incoming points
	type	Enumeration value describing the type of data we provide
	filename	Filename pointing to ".hdr" file for this data source
	_ncols	Number of columns in the data file
	_nrows	Number of rows in the data file
	_left	Left longitude of the data file
	_bottom	Bottom latitude of the data file
	_cellsize	Size of each cell in the data file

SourceGridFloat::~SourceGridFloat

(

)

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Member Function Documentation

double SourceGridFloat::value

(

int

offset

)

[protected]

Retrieve a specific value, either from raw source file, or from cache if it exists.

Parameters:

offset

Offset into the data file to read

Returns:

Value at offset location

void SourceGridFloat::resolve

(

Point *

p

)

[virtual]

Resolve a given Point by filling it with any new data this source can provide. Will ignore given point if this source can't provide data.

Parameters:

p

The point to try filling with data

Implements Source.

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Member Data Documentation

double* SourceGridFloat::cache [protected]

Internal cache of entire data file, if requested.

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

• source.h

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