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);