COIN-OR::LEMON - Graph Library

source: glemon-0.x/graph_displayer_canvas-zoom.cc @ 87:b44281e4cca7

gui
Last change on this file since 87:b44281e4cca7 was 87:b44281e4cca7, checked in by Akos Ladanyi, 14 years ago

improved zooming

  • Property exe set to *
File size: 1.2 KB
RevLine 
[53]1#include "graph_displayer_canvas.h"
2#include "broken_edge.h"
[59]3#include <cmath>
[27]4
5void GraphDisplayerCanvas::zoomIn()
6{
7  set_pixels_per_unit(
8      (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());
9}
10
11void GraphDisplayerCanvas::zoomOut()
12{
13  set_pixels_per_unit(
14      (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());
15}
16
17void GraphDisplayerCanvas::zoomFit()
18{
[87]19  updateScrollRegion();
20
[27]21  // get the height and width of the canvas
22  Gtk::Allocation a = get_allocation();
23  int aw = a.get_width();
24  int ah = a.get_height();
25
26  // get the bounding box of the graph
[87]27  update_now();
28  double x1, y1, x2, y2;
29  root()->get_bounds(x1, y1, x2, y2);
[27]30
31  // fit the graph to the window
[87]32  double ppu1 = (double) aw / fabs(x2 - x1);
33  double ppu2 = (double) ah / fabs(y2 - y1);
[27]34  set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);
35}
36
37void GraphDisplayerCanvas::zoom100()
38{
[87]39  updateScrollRegion();
[27]40  set_pixels_per_unit(1.0);
41}
42
43void GraphDisplayerCanvas::updateScrollRegion()
44{
[87]45  // get_bounds() yields something sane only when no updates are pending
46  // and it returns a sufficient, not an exact bounding box
47  update_now();
48  double x1, y1, x2, y2;
49  root()->get_bounds(x1, y1, x2, y2);
50  set_scroll_region(x1, y1, x2, y2);
[27]51}
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