diff options
Diffstat (limited to 'atari/slider.c')
| -rw-r--r-- | atari/slider.c | 131 |
1 files changed, 131 insertions, 0 deletions
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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