iscatt_core.c File Reference

Imagery library - wx.iscatt (wx Interactive Scatter Plot Tool) backend. More...

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <grass/gis.h>
#include <grass/vector.h>
#include <grass/raster.h>
#include <grass/imagery.h>
#include <grass/glocale.h>
#include "iclass_local_proto.h"

Include dependency graph for iscatt_core.c:

Go to the source code of this file.

Functions
int	I_create_cat_rast (struct Cell_head *cat_rast_region, const char *cat_rast)
	Create category raster conditions file. The file is used for holding selected areas from mapwindow. The reason why the standard GRASS raster is not used is that for every modification (new area is selected) we would need to create whole new raster. Instead of this scatter plot only modifies affected region in the internal pgm file. More...
int	I_insert_patch_to_cat_rast (const char *patch_rast, struct Cell_head *cat_rast_region, const char *cat_rast)
	Insert raster map patch into pgm file. More...
int	I_compute_scatts (struct Cell_head *region, struct scCats *scatt_conds, const char **cats_rasts_conds, const char **bands, int n_bands, struct scCats *scatts, const char **cats_rasts)
	Compute scatter plots data. More...
int	I_merge_arrays (unsigned char *merged_arr, unsigned char *overlay_arr, unsigned rows, unsigned cols, double alpha)
	Merge arrays according to opacity. Every pixel in array must be represented by 4 values (RGBA). More...
int	I_apply_colormap (unsigned char *vals, unsigned char *vals_mask, unsigned nvals, unsigned char *colmap, unsigned char *col_vals)
	Apply colromap to the raster. More...
int	I_rasterize (double *polygon, int pol_n_pts, unsigned char val, struct Cell_head *rast_region, unsigned char *rast)
	Wrapper for using of iclass perimeter rasterization by scatter plot. Warning: calls Rast_set_window. More...

Detailed Description

Imagery library - wx.iscatt (wx Interactive Scatter Plot Tool) backend.

Copyright (C) 2013 by the GRASS Development Team

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

Author

Stepan Turek stepa.nosp@m.n.tu.nosp@m.rek@s.nosp@m.ezna.nosp@m.m.cz (GSoC 2013, Mentor: Martin Landa)

Definition in file iscatt_core.c.

Function Documentation

I_apply_colormap()

int I_apply_colormap	(	unsigned char *	vals,
		unsigned char *	vals_mask,
		unsigned	nvals,
		unsigned char *	colmap,
		unsigned char *	col_vals
	)

Apply colromap to the raster.

Implemented for speeding up of scatter plots rendering.

Parameters

	vals	array of values for applying the colormap
	vals_mask	mask of vals array
	nvals	number of items of vals_mask and vals array
	colmap	colour map to be applied
[out]	col_vals	output raster with applied color map (length is 4 * nvals (RGBA))

Returns

0

Definition at line 891 of file iscatt_core.c.

I_compute_scatts()

int I_compute_scatts	(	struct Cell_head *	region,
		struct scCats *	scatt_conds,
		const char **	cats_rasts_conds,
		const char **	bands,
		int	n_bands,
		struct scCats *	scatts,
		const char **	cats_rasts
	)

Compute scatter plots data.

If category has not defined category raster condition file and no scatter plot exists with condition, default/full scatter plot is computed. Warning: calls Rast_set_window

Parameters

	region	analysis region, beaware that all input data must be prepared for this region (bands (their ranges), cats_rasts_conds rasters...)
	region	function calls Rast_set_window for this region
	scatt_conds	pointer to scScatts struct of type SC_SCATT_CONDITIONS, where are stored selected areas (conditions) in scatter plots
	cats_rasts_conds	paths to category raster conditions files representing selected areas from mapwindow (conditions) in rasters for every category
	cats_rasts_conds	index in array represents corresponding category id
	cats_rasts_conds	for manipulation with category raster conditions file see also I_id_scatt_to_bands and I_insert_patch_to_cat_rast
	bands	names of analyzed bands, order of bands is defined by their id
	n_bands	number of bands
[out]	scatts	pointer to scScatts struct of type SC_SCATT_DATA, where are computed scatter plots stored
[out]	cats_rasts	array of raster maps names for every category where will be stored all selected pixels

Returns

0 on success

-1 on failure

Definition at line 685 of file iscatt_core.c.

I_create_cat_rast()

int I_create_cat_rast	(	struct Cell_head *	cat_rast_region,
		const char *	cat_rast
	)

Create category raster conditions file. The file is used for holding selected areas from mapwindow. The reason why the standard GRASS raster is not used is that for every modification (new area is selected) we would need to create whole new raster. Instead of this scatter plot only modifies affected region in the internal pgm file.

Parameters

	cat_rast_region	region to be file generated for
[out]	cat_rast	path where the pgm raster file will be generated

Definition at line 59 of file iscatt_core.c.

References G_warning().

I_insert_patch_to_cat_rast()

int I_insert_patch_to_cat_rast	(	const char *	patch_rast,
		struct Cell_head *	cat_rast_region,
		const char *	cat_rast
	)

Insert raster map patch into pgm file.

See also

I_create_cat_rast

Warning: calls Rast_set_window

Parameters

patch_rast	name of raster map
cat_rast_region	region of category raster file
cat_rast	path to category raster file

Returns

0 on success

-1 on failure

Definition at line 231 of file iscatt_core.c.

I_merge_arrays()

int I_merge_arrays	(	unsigned char *	merged_arr,
		unsigned char *	overlay_arr,
		unsigned	rows,
		unsigned	cols,
		double	alpha
	)

Merge arrays according to opacity. Every pixel in array must be represented by 4 values (RGBA).

Implemented for speeding up of scatter plots rendering.

Parameters

merged_arr	array which will be overlayd with overlay_arr
overlay_arr	array to be merged_arr overlaid with
rows	number of rows for the both arrays
cols	number of columns for the both arrays
alpha	transparency (0-1) of the overlay array for merging

Returns

0

Definition at line 848 of file iscatt_core.c.

I_rasterize()

int I_rasterize	(	double *	polygon,
		int	pol_n_pts,
		unsigned char	val,
		struct Cell_head *	rast_region,
		unsigned char *	rast
	)

Wrapper for using of iclass perimeter rasterization by scatter plot. Warning: calls Rast_set_window.

Parameters

	polygon	array of polygon coordinates [x, y, x, y...]
	pol_n_pts	number of points in the polygon array
	val	value to be assigned to cells, which belong to plygon
	rast_region	region of raster
[out]	rast	raster to be pologyn rasterized in

Returns

0 on success

1 on failure

Definition at line 934 of file iscatt_core.c.