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/*
* Copyright (C) 2003 Christian Persch
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Id$
*/
#include "config.h"
#include "ephy-zoom.h"
#include <math.h>
guint
ephy_zoom_get_zoom_level_index (float level)
{
guint i;
float previous, current, mean;
/* Handle our options at the end of the list. */
if (level == EPHY_ZOOM_BEST_FIT) {
return n_zoom_levels - 2;
} else if (level == EPHY_ZOOM_FIT_WIDTH) {
return n_zoom_levels - 1;
}
previous = zoom_levels[0].level;
for (i = 1; i < n_zoom_levels - 2; i++)
{
current = zoom_levels[i].level;
mean = sqrt (previous * current);
if (level <= mean) return i - 1;
previous = current;
}
return n_zoom_levels - 4;
}
float
ephy_zoom_get_changed_zoom_level (float level, gint steps)
{
guint index;
index = ephy_zoom_get_zoom_level_index (level);
return zoom_levels[CLAMP(index + steps, 0, n_zoom_levels - 1)].level;
}
float ephy_zoom_get_nearest_zoom_level (float level)
{
return ephy_zoom_get_changed_zoom_level (level, 0);
}
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