1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/graph_displayer_canvas-zoom.cc	Mon Jul 07 08:10:39 2008 -0500
     1.3 @@ -0,0 +1,90 @@
     1.4 +/* -*- C++ -*-
     1.5 + *
     1.6 + * This file is a part of LEMON, a generic C++ optimization library
     1.7 + *
     1.8 + * Copyright (C) 2003-2006
     1.9 + * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
    1.10 + * (Egervary Research Group on Combinatorial Optimization, EGRES).
    1.11 + *
    1.12 + * Permission to use, modify and distribute this software is granted
    1.13 + * provided that this copyright notice appears in all copies. For
    1.14 + * precise terms see the accompanying LICENSE file.
    1.15 + *
    1.16 + * This software is provided "AS IS" with no warranty of any kind,
    1.17 + * express or implied, and with no claim as to its suitability for any
    1.18 + * purpose.
    1.19 + *
    1.20 + */
    1.21 +
    1.22 +#include <graph_displayer_canvas.h>
    1.23 +#include <cmath>
    1.24 +
    1.25 +void DigraphDisplayerCanvas::zoomIn()
    1.26 +{
    1.27 +  set_pixels_per_unit(
    1.28 +      (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());
    1.29 +  if(zoomtrack)
    1.30 +    {
    1.31 +      propertyChange(false, N_RADIUS);
    1.32 +      propertyChange(true, E_WIDTH);
    1.33 +    }
    1.34 +}
    1.35 +
    1.36 +void DigraphDisplayerCanvas::zoomOut()
    1.37 +{
    1.38 +  set_pixels_per_unit(
    1.39 +      (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());
    1.40 +  if(zoomtrack)
    1.41 +    {
    1.42 +      propertyChange(true, E_WIDTH);
    1.43 +      propertyChange(false, N_RADIUS);
    1.44 +    }
    1.45 +}
    1.46 +
    1.47 +void DigraphDisplayerCanvas::zoomFit()
    1.48 +{
    1.49 +  updateScrollRegion();
    1.50 +
    1.51 +  // get the height and width of the canvas
    1.52 +  Gtk::Allocation a = get_allocation();
    1.53 +  int aw = a.get_width();
    1.54 +  int ah = a.get_height();
    1.55 +
    1.56 +  // get the bounding box of the digraph
    1.57 +  update_now();
    1.58 +  double x1, y1, x2, y2;
    1.59 +  root()->get_bounds(x1, y1, x2, y2);
    1.60 +
    1.61 +  // fit the digraph to the window
    1.62 +  double ppu1 = (double) aw / fabs(x2 - x1);
    1.63 +  double ppu2 = (double) ah / fabs(y2 - y1);
    1.64 +  set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);
    1.65 +
    1.66 +  if(zoomtrack)
    1.67 +    {
    1.68 +      propertyChange(true, E_WIDTH);
    1.69 +      propertyChange(false, N_RADIUS);
    1.70 +    }
    1.71 +}
    1.72 +
    1.73 +void DigraphDisplayerCanvas::zoom100()
    1.74 +{
    1.75 +  updateScrollRegion();
    1.76 +  set_pixels_per_unit(1.0);
    1.77 +
    1.78 +  if(zoomtrack)
    1.79 +    {
    1.80 +      propertyChange(true, E_WIDTH);
    1.81 +      propertyChange(false, N_RADIUS);
    1.82 +    }
    1.83 +}
    1.84 +
    1.85 +void DigraphDisplayerCanvas::updateScrollRegion()
    1.86 +{
    1.87 +  // get_bounds() yields something sane only when no updates are pending
    1.88 +  // and it returns a sufficient, not an exact bounding box
    1.89 +  update_now();
    1.90 +  double x1, y1, x2, y2;
    1.91 +  root()->get_bounds(x1, y1, x2, y2);
    1.92 +  set_scroll_region(x1, y1, x2, y2);
    1.93 +}