Raster Library - Window functions. More...

#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/glocale.h>
#include "R.h"

Include dependency graph for raster/window.c:

Functions
void	Rast_get_window (struct Cell_head *window)
	Read the current window. More...

void	Rast_get_input_window (struct Cell_head *window)
	Read the current input window. More...

void	Rast_get_output_window (struct Cell_head *window)
	Read the current output window. More...

int	Rast_window_rows (void)
	Number of rows in active window. More...

int	Rast_window_cols (void)
	Number of columns in active window. More...

int	Rast_input_window_rows (void)
	Number of rows in active input window. More...

int	Rast_input_window_cols (void)
	Number of columns in active input window. More...

int	Rast_output_window_rows (void)
	Number of rows in active output window. More...

int	Rast_output_window_cols (void)
	Number of columns in active output window. More...

double	Rast_northing_to_row (double north, const struct Cell_head *window)
	Northing to row. More...

double	Rast_easting_to_col (double east, const struct Cell_head *window)
	Easting to column. More...

double	Rast_row_to_northing (double row, const struct Cell_head *window)
	Row to northing. More...

double	Rast_col_to_easting (double col, const struct Cell_head *window)
	Column to easting. More...

Detailed Description

Raster Library - Window functions.

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Author: Original author CERL

Definition in file raster/window.c.

Function Documentation

◆ Rast_col_to_easting()

double Rast_col_to_easting	(	double	col,
		const struct Cell_head *	window
	)

Column to easting.

Converts a col relative to a window to an easting.

Note: col is a double:

col+0.0 will return the easting for the western edge of the column.
col+0.5 will return the easting for the center of the column.
col+1.0 will return the easting for the eastern edge of the column.

Parameters

	col	column number
[in]	window	pointer to Cell_head

Returns: east coordinate

Definition at line 269 of file raster/window.c.

◆ Rast_easting_to_col()

double Rast_easting_to_col	(	double	east,
		const struct Cell_head *	window
	)

Easting to column.

Converts east relative to a window to a column.

Note: The result is a double. Casting it to an int will give the column number.

Parameters

east	east coordinate
window	pointer to Cell_head

Returns: column number

Definition at line 226 of file raster/window.c.

◆ Rast_get_input_window()

void Rast_get_input_window ( struct Cell_head * window )

Read the current input window.

Parameters

window pointer to Cell_head

Definition at line 45 of file raster/window.c.

◆ Rast_get_output_window()

void Rast_get_output_window ( struct Cell_head * window )

Read the current output window.

Parameters

window pointer to Cell_head

Definition at line 58 of file raster/window.c.

◆ Rast_get_window()

void Rast_get_window ( struct Cell_head * window )

Read the current window.

Parameters

window pointer to Cell_head

Definition at line 26 of file raster/window.c.

◆ Rast_input_window_cols()

int Rast_input_window_cols ( void )

Number of columns in active input window.

This routine returns the number of columns in the active input window.

Returns: number of columns

Definition at line 158 of file raster/window.c.

References Cell_head::cols, Rast__init_window(), and R__::rd_window.

Referenced by Rast_allocate_c_input_buf(), Rast_allocate_d_input_buf(), Rast_allocate_f_input_buf(), Rast_allocate_input_buf(), Rast_allocate_null_input_buf(), and Rast_zero_input_buf().

◆ Rast_input_window_rows()

int Rast_input_window_rows ( void )

Number of rows in active input window.

This routine returns the number of rows in the active input window.

Returns: number of rows

Definition at line 144 of file raster/window.c.

References Rast__init_window(), R__::rd_window, and Cell_head::rows.

◆ Rast_northing_to_row()

double Rast_northing_to_row	(	double	north,
		const struct Cell_head *	window
	)

Northing to row.

Converts a northing relative to a window to a row.

Note: The result is a double. Casting it to an integer will give the row number.

Parameters

north	northing value
window	pointer to Cell_head

Returns: row number

Definition at line 207 of file raster/window.c.

◆ Rast_output_window_cols()

int Rast_output_window_cols ( void )

Number of columns in active output window.

This routine returns the number of columns in the active output window.

Returns: number of columns

Definition at line 186 of file raster/window.c.

References Cell_head::cols, Rast__init_window(), and R__::wr_window.

Referenced by Rast_allocate_c_output_buf(), Rast_allocate_d_output_buf(), Rast_allocate_f_output_buf(), Rast_allocate_null_output_buf(), Rast_allocate_output_buf(), and Rast_zero_output_buf().

◆ Rast_output_window_rows()

int Rast_output_window_rows ( void )

Number of rows in active output window.

This routine returns the number of rows in the active output window.

Returns: number of rows

Definition at line 172 of file raster/window.c.

References Rast__init_window(), Cell_head::rows, and R__::wr_window.

◆ Rast_row_to_northing()

double Rast_row_to_northing	(	double	row,
		const struct Cell_head *	window
	)

Row to northing.

Converts a row relative to a window to a northing.

Note: row is a double:

row+0.0 will return the northing for the northern edge of the row.
row+0.5 will return the northing for the center of the row.
row+1.0 will return the northing for the southern edge of the row.

Parameters

	row	row number
[in]	window	pointer to Cell_head

Returns: north coordinate

Definition at line 249 of file raster/window.c.

◆ Rast_window_cols()

int Rast_window_cols ( void )

Number of columns in active window.

These routines return the number of rows and columns (respectively) in the active module region. Before raster maps can be read or written, it is necessary to known how many rows and columns are in the active region. For example:

int nrows, cols;
int row, col;
 
nrows = Rast_window_rows();
ncols = Rast_window_cols();
for (row = 0; row < nrows; row++) {
// read row ...
for (col = 0; col < ncols; col++) {
// process col ...
}
}

Returns: number of columns

Definition at line 124 of file raster/window.c.

References _, Cell_head::cols, G_fatal_error(), Rast__init_window(), R__::split_window, and R__::wr_window.

Referenced by Rast_allocate_buf(), Rast_allocate_c_buf(), Rast_allocate_d_buf(), Rast_allocate_f_buf(), Rast_allocate_null_buf(), and Rast_zero_buf().

◆ Rast_window_rows()

int Rast_window_rows ( void )

Number of rows in active window.

This routine returns the number of rows in the active module window. Before raster files can be read or written, it is necessary to known how many rows are in the active window. For example:

int nrows, cols;
int row, col;
 
nrows = Rast_window_rows();
ncols = Rast_window_cols();
for (row = 0; row < nrows; row++) {
// read row ...
for (col = 0; col < ncols; col++) {
// process col ...
}
}

Returns: number of rows

Definition at line 87 of file raster/window.c.

References _, G_fatal_error(), Rast__init_window(), Cell_head::rows, R__::split_window, and R__::wr_window.

Functions

Detailed Description

Function Documentation

◆ Rast_col_to_easting()

◆ Rast_easting_to_col()

◆ Rast_get_input_window()

◆ Rast_get_output_window()

◆ Rast_get_window()

◆ Rast_input_window_cols()

◆ Rast_input_window_rows()

◆ Rast_northing_to_row()

◆ Rast_output_window_cols()

◆ Rast_output_window_rows()

◆ Rast_row_to_northing()

◆ Rast_window_cols()

◆ Rast_window_rows()