The graph adadptors can be alteration observed.
In most cases it uses the adapted graph alteration notifiers.
Only special case is now the UndirGraphAdaptor, where
we have to proxy the signals from the graph.
The SubBidirGraphAdaptor is removed, because it doest not
gives more feature than the EdgeSubGraphAdaptor<UndirGraphAdaptor<Graph>>.
The ResGraphAdaptor is based on this composition.
1 #include "graph_displayer_canvas.h"
4 void GraphDisplayerCanvas::zoomIn()
7 (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());
10 void GraphDisplayerCanvas::zoomOut()
13 (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());
16 void GraphDisplayerCanvas::zoomFit()
20 // get the height and width of the canvas
21 Gtk::Allocation a = get_allocation();
22 int aw = a.get_width();
23 int ah = a.get_height();
25 // get the bounding box of the graph
27 double x1, y1, x2, y2;
28 root()->get_bounds(x1, y1, x2, y2);
30 // fit the graph to the window
31 double ppu1 = (double) aw / fabs(x2 - x1);
32 double ppu2 = (double) ah / fabs(y2 - y1);
33 set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);
36 void GraphDisplayerCanvas::zoom100()
39 set_pixels_per_unit(1.0);
42 void GraphDisplayerCanvas::updateScrollRegion()
44 // get_bounds() yields something sane only when no updates are pending
45 // and it returns a sufficient, not an exact bounding box
47 double x1, y1, x2, y2;
48 root()->get_bounds(x1, y1, x2, y2);
49 set_scroll_region(x1, y1, x2, y2);