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authorPerberos <[email protected]>2011-11-09 18:17:43 -0300
committerPerberos <[email protected]>2011-11-09 18:17:43 -0300
commitf6ce926719943751cf65cacde7fae050593eb2d6 (patch)
tree9224d1751678cf2d1fbd0431f128b711311c0287 /cut-n-paste/zoom-control/ephy-zoom.c
downloadatril-f6ce926719943751cf65cacde7fae050593eb2d6.tar.bz2
atril-f6ce926719943751cf65cacde7fae050593eb2d6.tar.xz
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diff --git a/cut-n-paste/zoom-control/ephy-zoom.c b/cut-n-paste/zoom-control/ephy-zoom.c
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 beginning of the list. */
+ if (level == EPHY_ZOOM_BEST_FIT) {
+ return 0;
+ } else if (level == EPHY_ZOOM_FIT_WIDTH) {
+ return 1;
+ }
+
+ previous = zoom_levels[3].level;
+
+ for (i = 4; i < n_zoom_levels; i++)
+ {
+ current = zoom_levels[i].level;
+ mean = sqrt (previous * current);
+
+ if (level <= mean) return i - 1;
+
+ previous = current;
+ }
+
+ return n_zoom_levels - 1;
+}
+
+
+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, 3, n_zoom_levels - 1)].level;
+}
+
+float ephy_zoom_get_nearest_zoom_level (float level)
+{
+ return ephy_zoom_get_changed_zoom_level (level, 0);
+}