gtk2_ardour/diamond.cc

   1 /*
   2     Copyright (C) 2007 Paul Davis
   3     Author: Dave Robillard
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20 #include "diamond.h"
  21
  22 using namespace Gnome::Canvas;
  23 using namespace Gnome::Art;
  24
  25 Diamond::Diamond(Group& group, double height)
  26         : Polygon(group)
  27         , _x (0)
  28         , _y (0)
  29         , _h (height)
  30 {
  31         points = gnome_canvas_points_new (4);
  32         g_object_set (gobj(), "points", points, NULL);
  33         move_to (0, 0);
  34 }
  35
  36 Diamond::~Diamond ()
  37 {
  38         gnome_canvas_points_free (points);
  39 }
  40
  41 void
  42 Diamond::set_height (double height)
  43 {
  44         _h = height;
  45         move_to (_x, _y);
  46 }
  47
  48 void
  49 Diamond::move_to (double x, double y)
  50 {
  51         _x = x;
  52         _y = y;
  53
  54         points->coords[0] = _x;
  55         points->coords[1] = _y + (_h * 2.0);
  56
  57         points->coords[2] = _x + _h;
  58         points->coords[3] = _y + _h;
  59
  60         points->coords[4] = _x;
  61         points->coords[5] = _y;
  62
  63         points->coords[6] = _x - _h;
  64         points->coords[7] = _y + _h;
  65
  66         g_object_set (gobj(), "points", points, NULL);
  67 }
  68
  69 void
  70 Diamond::move_by (double dx, double dy)
  71 {
  72         points->coords[0] += dx;
  73         points->coords[1] += dy;
  74
  75         points->coords[2] += dx;
  76         points->coords[3] += dy;
  77
  78         points->coords[4] += dx;
  79         points->coords[5] += dy;
  80
  81         points->coords[6] += dx;
  82         points->coords[7] += dy;
  83
  84         g_object_set (gobj(), "points", points, NULL);
  85 }