gui/zoom.c

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*
   3  * LADI Session Handler (ladish)
   4  *
   5  * Copyright (C) 2010 Nedko Arnaudov <nedko@arnaudov.name>
   6  *
   7  **************************************************************************
   8  * This file contains the canvas zoom related code
   9  **************************************************************************
  10  *
  11  * LADI Session Handler is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * LADI Session Handler is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
  23  * or write to the Free Software Foundation, Inc.,
  24  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  25  */
  26
  27 #include "zoom.h"
  28 #include "canvas.h"
  29 #include "graph_view.h"
  30
  31 #define ZOOM_CHANGE 1.1
  32
  33 void zoom_100(void)
  34 {
  35   canvas_handle canvas;
  36
  37   log_info("zoom 100%% request");
  38
  39   canvas = get_current_canvas();
  40   if (canvas != NULL)
  41   {
  42     canvas_set_zoom(canvas, 1.0);
  43   }
  44 }
  45
  46 void zoom_fit(void)
  47 {
  48   canvas_handle canvas;
  49
  50   log_info("zoom fit request");
  51
  52   canvas = get_current_canvas();
  53   if (canvas != NULL)
  54   {
  55     canvas_set_zoom_fit(canvas);
  56   }
  57 }
  58
  59 void zoom_in(void)
  60 {
  61   canvas_handle canvas;
  62
  63   log_info("zoom in request");
  64
  65   canvas = get_current_canvas();
  66   if (canvas != NULL)
  67   {
  68     canvas_set_zoom(canvas, canvas_get_zoom(canvas) * ZOOM_CHANGE);
  69   }
  70 }
  71
  72 void zoom_out(void)
  73 {
  74   canvas_handle canvas;
  75
  76   log_info("zoom out request");
  77
  78   canvas = get_current_canvas();
  79   if (canvas != NULL)
  80   {
  81     canvas_set_zoom(canvas, canvas_get_zoom(canvas) / ZOOM_CHANGE);
  82   }
  83 }