COIN-OR::LEMON - Graph Library

source: glemon-0.x/graph_displayer_canvas-zoom.cc @ 27:e2c86ae158cf

gui
Last change on this file since 27:e2c86ae158cf was 27:e2c86ae158cf, checked in by Hegyi Péter, 14 years ago

File graph_displayer is split in functional parts.

  • Property exe set to *
File size: 1.2 KB
Line 
1#include <graph_displayer_canvas.h>
2#include <broken_edge.h>
3#include <math.h>
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{
19  // get the height and width of the canvas
20  Gtk::Allocation a = get_allocation();
21  int aw = a.get_width();
22  int ah = a.get_height();
23  // add some space
24  aw -= 5; if (aw < 0) aw = 0;
25  ah -= 5; if (ah < 0) ah = 0;
26
27  // get the bounding box of the graph
28  double wx1, wy1, wx2, wy2;
29  Gnome::Canvas::Item* pCanvasItem = root();
30  pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);
31
32  // fit the graph to the window
33  double ppu1 = (double) aw / fabs(wx2 - wx1);
34  double ppu2 = (double) ah / fabs(wy2 - wy1);
35  set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);
36}
37
38void GraphDisplayerCanvas::zoom100()
39{
40  set_pixels_per_unit(1.0);
41}
42
43void GraphDisplayerCanvas::updateScrollRegion()
44{
45  double wx1, wy1, wx2, wy2;
46  Gnome::Canvas::Item* pCanvasItem = root();
47  pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);
48  set_scroll_region(wx1, wy1, wx2, wy2);
49}
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