COIN-OR::LEMON - Graph Library

source: glemon-0.x/graph_displayer_canvas-zoom.cc

Last change on this file was 174:95872af46fc4, checked in by Alpar Juttner, 13 years ago

Add copyright headers

  • Property exe set to *
File size: 2.2 KB
Line 
1/* -*- C++ -*-
2 *
3 * This file is a part of LEMON, a generic C++ optimization library
4 *
5 * Copyright (C) 2003-2006
6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
7 * (Egervary Research Group on Combinatorial Optimization, EGRES).
8 *
9 * Permission to use, modify and distribute this software is granted
10 * provided that this copyright notice appears in all copies. For
11 * precise terms see the accompanying LICENSE file.
12 *
13 * This software is provided "AS IS" with no warranty of any kind,
14 * express or implied, and with no claim as to its suitability for any
15 * purpose.
16 *
17 */
18
19#include "graph_displayer_canvas.h"
20#include <cmath>
21
22void GraphDisplayerCanvas::zoomIn()
23{
24  set_pixels_per_unit(
25      (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());
26  if(zoomtrack)
27    {
28      propertyChange(false, N_RADIUS);
29      propertyChange(true, E_WIDTH);
30    }
31}
32
33void GraphDisplayerCanvas::zoomOut()
34{
35  set_pixels_per_unit(
36      (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());
37  if(zoomtrack)
38    {
39      propertyChange(true, E_WIDTH);
40      propertyChange(false, N_RADIUS);
41    }
42}
43
44void GraphDisplayerCanvas::zoomFit()
45{
46  updateScrollRegion();
47
48  // get the height and width of the canvas
49  Gtk::Allocation a = get_allocation();
50  int aw = a.get_width();
51  int ah = a.get_height();
52
53  // get the bounding box of the graph
54  update_now();
55  double x1, y1, x2, y2;
56  root()->get_bounds(x1, y1, x2, y2);
57
58  // fit the graph to the window
59  double ppu1 = (double) aw / fabs(x2 - x1);
60  double ppu2 = (double) ah / fabs(y2 - y1);
61  set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);
62
63  if(zoomtrack)
64    {
65      propertyChange(true, E_WIDTH);
66      propertyChange(false, N_RADIUS);
67    }
68}
69
70void GraphDisplayerCanvas::zoom100()
71{
72  updateScrollRegion();
73  set_pixels_per_unit(1.0);
74
75  if(zoomtrack)
76    {
77      propertyChange(true, E_WIDTH);
78      propertyChange(false, N_RADIUS);
79    }
80}
81
82void GraphDisplayerCanvas::updateScrollRegion()
83{
84  // get_bounds() yields something sane only when no updates are pending
85  // and it returns a sufficient, not an exact bounding box
86  update_now();
87  double x1, y1, x2, y2;
88  root()->get_bounds(x1, y1, x2, y2);
89  set_scroll_region(x1, y1, x2, y2);
90}
Note: See TracBrowser for help on using the repository browser.