From 124e4cd78814e368488d8e86c15f95223f365a44 Mon Sep 17 00:00:00 2001
From: John Mark Bell <jmb@netsurf-browser.org>
Date: Wed, 5 Jan 2011 21:02:22 +0000
Subject: Atari frontend (credit: Ole Loots)

svn path=/trunk/netsurf/; revision=11218
---
 atari/slider.c | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 atari/slider.c

(limited to 'atari/slider.c')

diff --git a/atari/slider.c b/atari/slider.c
new file mode 100644
index 000000000..37eead414
--- /dev/null
+++ b/atari/slider.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright 2010 Ole Loots <ole@monochrom.net>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf 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; version 2 of the License.
+ *
+ * NetSurf 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "atari/slider.h"
+
+long inline slider_pages( long content_dim, long workarea_dim )
+{
+	long ret;
+	ret = (long)ceil( (float)content_dim / (float)workarea_dim );
+	if( ret <= 0 )
+		ret = 1;
+	return( ret );
+}
+
+float inline slider_pages_dec( long content_dim, long workarea_dim )
+{
+	float ret;
+	ret = (float)content_dim / (float)workarea_dim );
+	if( ret <= 0 )
+		ret = 1;
+	return( ret );
+}
+
+
+int slider_gem_size( long content_dim, long workarea_dim )
+{
+	int ret;
+	int pages = slider_pages(content_dim, workarea_dim);
+	if( pages <= 0 )
+		return 1;
+	ret = 1000 / pages;
+	if( ret <= 0 )
+		ret = 1;
+	return( ret );
+}
+
+
+int slider_pos_to_gem_pos( long content_dim, long workarea_dim, long slider_pos )
+{
+	int ret;
+	int spos = slider_max_pos( content_dim, workarea_dim );
+	if( spos < 1 )
+		return( 0 );
+	float x = (float)1000 / spos;
+	if(content_dim >= 1000)
+		ret = (int)( x * slider_pos );
+	else
+		ret = (int)ceilf( (float)x * slider_pos );
+	return( max(0, ret) );
+}
+
+
+long slider_gem_pos_to_pos( long content_dim, long workarea_dim, int slider_pos )
+{
+	long ret;
+	int nmax = slider_max_pos( content_dim, workarea_dim );
+	float x = (float)1000 / nmax;
+	if(content_dim >= 1000)
+		ret = (int) ( (float) slider_pos * x);
+	else
+		ret = (int) ceilf( (float)slider_pos * x );
+	return( max(0, ret)  );
+}
+
+
+long inline slider_gem_size_to_res( long workarea_dim, int gem_size )
+{
+	/* subtract [<-] and [->] buttons (16*2) from workarea: */
+	int factor = 1000 / (workarea_dim - 16*2);
+	return( max(1, gem_size / factor) );
+}
+
+
+long slider_gem_pos_to_res( long content_dim, long workarea_dim, int gem_pos )
+{
+	/* subtract size of boxchar: */
+	int room = workarea_dim - 16 * 2 - slider_gem_size_to_res(workarea_dim, slider_gem_sz );
+
+	/*
+		1. Berechnen welchem Prozentsatz die GEM Position entspricht:
+	 1000 = Grundwert
+	 gem_pos = Prozentwert
+	 Prozentsatz = ?
+	 Rechnung: Prozentwert * 100 / 1000
+	 Gekürzt: Prozentwert / 10
+	 p_calc = der Prozentsatz / 100 -> fuer vereinfachte nutzung
+	*/
+	/* float p_gem = (float)gem_pos / 10; */
+	float p_calc = (float)gem_pos / 1000;
+
+	/*
+		2. Berechnen welchem Pixel der Prozentsatz entspricht
+		room = Grundwert
+		p_gem = Prozentsatz
+		Prozentwert = ?
+		Rechnung = G * p / 100
+		Anmerkung: es wird p_calc verwendet, da praktischer...
+	*/
+	int pixel = (float)((float)room * p_calc)+0.5;
+
+	return( pixel );
+}
+
+
+/*
+
+Not implemented
+
+long slider_pos_to_res( long content_dim, long workarea_dim, int pos )
+{
+	long max_pos = slider_max_pos( content_dim, workarea_dim );
+	return( -1 );
+}
+ */
+
+
-- 
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