mirror of https://github.com/GNOME/gimp.git
385 lines
18 KiB
C
385 lines
18 KiB
C
/*
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This is a plug-in for the GIMP.
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*
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* Plugin to convert a selection to a path.
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*
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* Copyright (C) 1999 Andy Thomas alt@gimp.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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/* Change log:-
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* 0.1 First version.
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*/
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#include "config.h"
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#include <libgimp/gimp.h>
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#include <libgimp/gimpui.h>
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#include "types.h"
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#include "sel2path.h"
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#define SCALE_WIDTH 100
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#define SCALE_DIGITS 8
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static GSList * adjust_widgets = NULL;
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/* Reset to recommended defaults */
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void
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reset_adv_dialog (void)
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{
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GSList *list;
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GtkObject *widget;
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gdouble *value;
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for (list = adjust_widgets; list; list = g_slist_next (list))
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{
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widget = GTK_OBJECT (list->data);
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value = (gdouble *) g_object_get_data (G_OBJECT (widget),
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"default_value");
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if (GTK_IS_ADJUSTMENT (widget))
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{
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gtk_adjustment_set_value (GTK_ADJUSTMENT (widget),
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*value);
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}
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else if (GTK_IS_TOGGLE_BUTTON (widget))
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{
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gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (widget),
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(gboolean)(*value));
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}
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else
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g_warning ("Internal widget list error");
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}
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}
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static gpointer
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def_val (gdouble default_value)
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{
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gdouble *value = g_new0 (gdouble, 1);
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*value = default_value;
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return (value);
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}
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GtkWidget *
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dialog_create_selection_area (SELVALS *sels)
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{
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GtkWidget *table;
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GtkWidget *check;
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GtkObject *adj;
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gint row;
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table = gtk_table_new (20, 3, FALSE);
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gtk_table_set_row_spacings (GTK_TABLE (table), 6);
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gtk_table_set_col_spacings (GTK_TABLE (table), 6);
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row = 0;
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Align Threshold:", SCALE_WIDTH, SCALE_DIGITS,
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sels->align_threshold,
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0.2, 2.0, 0.1, 0.1, 2,
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TRUE, 0, 0,
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"If two endpoints are closer than this,"
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"they are made to be equal.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->align_threshold);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (0.5));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Corner Always Threshold:", SCALE_WIDTH, SCALE_DIGITS,
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sels->corner_always_threshold,
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30, 180, 1, 1, 2,
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TRUE, 0, 0,
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"If the angle defined by a point and its predecessors "
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"and successors is smaller than this, it's a corner, "
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"even if it's within `corner_surround' pixels of a "
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"point with a smaller angle.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->corner_always_threshold);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (60.0));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Corner Surround:", SCALE_WIDTH, SCALE_DIGITS,
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sels->corner_surround,
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3, 8, 1, 1, 0,
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TRUE, 0, 0,
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"Number of points to consider when determining if a "
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"point is a corner or not.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->corner_surround);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (4.0));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Corner Threshold:", SCALE_WIDTH, SCALE_DIGITS,
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sels->corner_threshold,
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0, 180, 1, 1, 2,
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TRUE, 0, 0,
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"If a point, its predecessors, and its successors "
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"define an angle smaller than this, it's a corner.",
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NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->corner_threshold);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (100.0));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Error Threshold:", SCALE_WIDTH, SCALE_DIGITS,
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sels->error_threshold,
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0.2, 10, 0.1, 0.1, 2,
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TRUE, 0, 0,
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"Amount of error at which a fitted spline is "
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"unacceptable. If any pixel is further away "
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"than this from the fitted curve, we try again.",
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NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->error_threshold);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (0.40));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Filter Alternative Surround:", SCALE_WIDTH, SCALE_DIGITS,
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sels->filter_alternative_surround,
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1, 10, 1, 1, 0,
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TRUE, 0, 0,
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"A second number of adjacent points to consider "
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"when filtering.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->filter_alternative_surround);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (1.0));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Filter Epsilon:", SCALE_WIDTH, SCALE_DIGITS,
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sels->filter_epsilon,
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5, 40, 1, 1, 2,
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TRUE, 0, 0,
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"If the angles between the vectors produced by "
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"filter_surround and filter_alternative_surround "
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"points differ by more than this, use the one from "
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"filter_alternative_surround.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->filter_epsilon);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (10.0));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Filter Iteration Count:", SCALE_WIDTH, SCALE_DIGITS,
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sels->filter_iteration_count,
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4, 70, 1, 1, 0,
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TRUE, 0, 0,
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"Number of times to smooth original data points. "
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"Increasing this number dramatically --- to 50 or "
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"so --- can produce vastly better results. But if "
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"any points that ``should'' be corners aren't found, "
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"the curve goes to hell around that point.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->filter_iteration_count);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (4.0));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Filter Percent:", SCALE_WIDTH, SCALE_DIGITS,
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sels->filter_percent,
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0, 1, 0.05, 0.01, 2,
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TRUE, 0, 0,
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"To produce the new point, use the old point plus "
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"this times the neighbors.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->filter_percent);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (0.33));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Filter Secondary Surround:", SCALE_WIDTH, SCALE_DIGITS,
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sels->filter_secondary_surround,
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3, 10, 1, 1, 0,
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TRUE, 0, 0,
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"Number of adjacent points to consider if "
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"`filter_surround' points defines a straight line.",
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NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->filter_secondary_surround);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (3.0));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Filter Surround:", SCALE_WIDTH, SCALE_DIGITS,
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sels->filter_surround,
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2, 10, 1, 1, 0,
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TRUE, 0, 0,
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"Number of adjacent points to consider when filtering.",
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NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->filter_surround);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (2.0));
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check = gtk_check_button_new_with_label ("Keep Knees");
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gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check), sels->keep_knees);
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gtk_table_attach (GTK_TABLE (table), check, 1, 3, row, row + 1,
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GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
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gimp_help_set_help_data (GTK_WIDGET (check),
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"Says whether or not to remove ``knee'' "
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"points after finding the outline.", NULL);
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g_signal_connect (check, "toggled",
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G_CALLBACK (gimp_toggle_button_update),
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&sels->keep_knees);
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gtk_widget_show (check);
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adjust_widgets = g_slist_append (adjust_widgets, check);
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g_object_set_data (G_OBJECT (check), "default_value", def_val ((gdouble)FALSE));
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row++;
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Line Reversion Threshold:", SCALE_WIDTH, SCALE_DIGITS,
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sels->line_reversion_threshold,
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0.01, 0.2, 0.01, 0.01, 3,
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TRUE, 0, 0,
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"If a spline is closer to a straight line than this, "
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"it remains a straight line, even if it would otherwise "
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"be changed back to a curve. This is weighted by the "
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"square of the curve length, to make shorter curves "
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"more likely to be reverted.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->line_reversion_threshold);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (0.01));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Line Threshold:", SCALE_WIDTH, SCALE_DIGITS,
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sels->line_threshold,
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0.2, 4, 0.1, 0.01, 2,
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TRUE, 0, 0,
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"How many pixels (on the average) a spline can "
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"diverge from the line determined by its endpoints "
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"before it is changed to a straight line.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->line_threshold);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (0.5));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Reparametrize Improvement:", SCALE_WIDTH, SCALE_DIGITS,
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sels->reparameterize_improvement,
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0, 1, 0.05, 0.01, 2,
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TRUE, 0, 0,
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"If reparameterization doesn't improve the fit by this "
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"much percent, stop doing it. ""Amount of error at which "
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"it is pointless to reparameterize.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->reparameterize_improvement);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (0.01));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Reparametrize Threshold:", SCALE_WIDTH, SCALE_DIGITS,
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sels->reparameterize_threshold,
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1, 50, 0.5, 0.5, 2,
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TRUE, 0, 0,
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"Amount of error at which it is pointless to reparameterize. "
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"This happens, for example, when we are trying to fit the "
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"outline of the outside of an `O' with a single spline. "
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"The initial fit is not good enough for the Newton-Raphson "
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"iteration to improve it. It may be that it would be better "
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"to detect the cases where we didn't find any corners.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->reparameterize_threshold);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (1.0));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Subdivide Search:", SCALE_WIDTH, SCALE_DIGITS,
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sels->subdivide_search,
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0.05, 1, 0.05, 0.01, 2,
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TRUE, 0, 0,
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"Percentage of the curve away from the worst point "
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"to look for a better place to subdivide.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->subdivide_search);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (0.1));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Subdivide Surround:", SCALE_WIDTH, SCALE_DIGITS,
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sels->subdivide_surround,
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2, 10, 1, 1, 0,
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TRUE, 0, 0,
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"Number of points to consider when deciding whether "
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"a given point is a better place to subdivide.",
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NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->subdivide_surround);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (4.0));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Subdivide Threshold:", SCALE_WIDTH, SCALE_DIGITS,
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sels->subdivide_threshold,
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0.01, 1, 0.01, 0.01, 2,
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TRUE, 0, 0,
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"How many pixels a point can diverge from a straight "
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"line and still be considered a better place to "
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"subdivide.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->subdivide_threshold);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (0.03));
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adj = gimp_scale_entry_new (GTK_TABLE (table), 0, row++,
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"Tangent Surround:", SCALE_WIDTH, SCALE_DIGITS,
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sels->tangent_surround,
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2, 10, 1, 1, 0,
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TRUE, 0, 0,
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"Number of points to look at on either side of a "
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"point when computing the approximation to the "
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"tangent at that point.", NULL);
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g_signal_connect (adj, "value-changed",
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G_CALLBACK (gimp_double_adjustment_update),
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&sels->tangent_surround);
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adjust_widgets = g_slist_append (adjust_widgets, adj);
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g_object_set_data (G_OBJECT (adj), "default_value", def_val (3.0));
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return table;
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}
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