1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/graph_displayer_canvas-zoom.cc	Fri Jun 24 07:58:18 2005 +0000
     1.3 @@ -0,0 +1,49 @@
     1.4 +#include <graph_displayer_canvas.h>
     1.5 +#include <broken_edge.h>
     1.6 +#include <math.h>
     1.7 +
     1.8 +void GraphDisplayerCanvas::zoomIn()
     1.9 +{
    1.10 +  set_pixels_per_unit(
    1.11 +      (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());
    1.12 +}
    1.13 +
    1.14 +void GraphDisplayerCanvas::zoomOut()
    1.15 +{
    1.16 +  set_pixels_per_unit(
    1.17 +      (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());
    1.18 +}
    1.19 +
    1.20 +void GraphDisplayerCanvas::zoomFit()
    1.21 +{
    1.22 +  // get the height and width of the canvas
    1.23 +  Gtk::Allocation a = get_allocation();
    1.24 +  int aw = a.get_width();
    1.25 +  int ah = a.get_height();
    1.26 +  // add some space
    1.27 +  aw -= 5; if (aw < 0) aw = 0;
    1.28 +  ah -= 5; if (ah < 0) ah = 0;
    1.29 +
    1.30 +  // get the bounding box of the graph
    1.31 +  double wx1, wy1, wx2, wy2;
    1.32 +  Gnome::Canvas::Item* pCanvasItem = root();
    1.33 +  pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);
    1.34 +
    1.35 +  // fit the graph to the window
    1.36 +  double ppu1 = (double) aw / fabs(wx2 - wx1);
    1.37 +  double ppu2 = (double) ah / fabs(wy2 - wy1);
    1.38 +  set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);
    1.39 +}
    1.40 +
    1.41 +void GraphDisplayerCanvas::zoom100()
    1.42 +{
    1.43 +  set_pixels_per_unit(1.0);
    1.44 +}
    1.45 +
    1.46 +void GraphDisplayerCanvas::updateScrollRegion()
    1.47 +{
    1.48 +  double wx1, wy1, wx2, wy2;
    1.49 +  Gnome::Canvas::Item* pCanvasItem = root();
    1.50 +  pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);
    1.51 +  set_scroll_region(wx1, wy1, wx2, wy2);
    1.52 +}