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/* jitter.c */
/*
* ggobi
* Copyright (C) AT&T, Duncan Temple Lang, Dianne Cook 1999-2005
*
* ggobi is free software; you may use, redistribute, and/or modify it
* under the terms of the Common Public License, which is distributed
* with the source code and displayed on the ggobi web site,
* www.ggobi.org. For more information, contact the authors:
*
* Deborah F. Swayne dfs@research.att.com
* Di Cook dicook@iastate.edu
* Duncan Temple Lang duncan@wald.ucdavis.edu
* Andreas Buja andreas.buja@wharton.upenn.edu
*/
/*
* Contains jittering routines for tform; see missing.c for the
* jittering routines for missing data.
*/
#include <stdlib.h>
#include <math.h>
#include <gtk/gtk.h>
#include "vars.h"
#include "externs.h"
gfloat
jitter_randval (gint type)
{
/*
* generate a random value.
*/
gdouble drand;
static gdouble dsave;
static gboolean isave = false;
if (type == UNIFORM) {
drand = randvalue ();
/*
* Center and scale to [-1, 1]
*/
drand = (drand - .5) * 2;
}
else if (type == NORMAL) {
gboolean check = true;
gdouble d, dfac;
if (isave) {
isave = false;
/* prepare to return the previously saved value */
drand = dsave;
}
else {
isave = true;
while (check) {
rnorm2 (&drand, &dsave);
d = drand * drand + dsave * dsave;
if (d < 1.0) {
check = false;
dfac = sqrt (-2. * log (d) / d);
drand = drand * dfac;
dsave = dsave * dfac;
}
} /* end while */
} /* end else */
/*
* Already centered; scale to approximately [-1, 1]
*/
drand = (drand / 3.0);
}
return ((gfloat) drand);
}
void
rejitter (gint * selected_cols, gint nselected_cols, GGobiData * d,
ggobid * gg)
{
gint i, j, k, m;
greal frand, fworld, fjit;
greal precis = (gfloat) PRECISION1;
vartabled *vt;
g_assert (d->jitdata.nrows == d->nrows);
g_assert (d->jitdata.ncols == d->ncols);
for (j = 0; j < nselected_cols; j++) {
k = selected_cols[j];
vt = vartable_element_get (k, d);
for (i = 0; i < d->nrows_in_plot; i++) {
m = d->rows_in_plot.els[i];
/*-- jitter_one_value (m, k); --*/
frand = (greal) jitter_randval (d->jitter.type) * precis;
/*
* The world.vals used here is already jittered:
* subtract out the previous jittered value ...
*/
if (d->jitter.convex) {
fworld = d->world.vals[m][k] - d->jitdata.vals[m][k];
fjit = (greal) vt->jitter_factor * (frand - fworld);
}
else
fjit = vt->jitter_factor * frand;
d->jitdata.vals[m][k] = fjit;
}
}
tform_to_world (d, gg);
displays_tailpipe (FULL, gg);
}
void
jitter_value_set (gfloat value, GGobiData * d, ggobid * gg)
{
GtkWidget *tree_view =
get_tree_view_from_object (G_OBJECT (gg->jitter_ui.window));
gint *vars; // = (gint *) g_malloc (d->ncols * sizeof(gint));
gint nvars;
gint j;
vartabled *vt;
vars = get_selections_from_tree_view (tree_view, &nvars);
for (j = 0; j < nvars; j++) {
vt = vartable_element_get (vars[j], d);
vt->jitter_factor = value;
}
g_free ((gpointer) vars);
}
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