#include "graph_displayer_canvas.h"

 #include "broken_edge.h"

 #include <math.h>

 void GraphDisplayerCanvas::zoomIn()

 {

   set_pixels_per_unit(

       (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());

 }

 void GraphDisplayerCanvas::zoomOut()

 {

   set_pixels_per_unit(

       (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());

 }

 void GraphDisplayerCanvas::zoomFit()

 {

   // get the height and width of the canvas

   Gtk::Allocation a = get_allocation();

   int aw = a.get_width();

   int ah = a.get_height();

   // add some space

   aw -= 5; if (aw < 0) aw = 0;

   ah -= 5; if (ah < 0) ah = 0;

   // get the bounding box of the graph

   double wx1, wy1, wx2, wy2;

   Gnome::Canvas::Item* pCanvasItem = root();

   pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);

   // fit the graph to the window

   double ppu1 = (double) aw / fabs(wx2 - wx1);

   double ppu2 = (double) ah / fabs(wy2 - wy1);

   set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);

 }

 void GraphDisplayerCanvas::zoom100()

 {

   set_pixels_per_unit(1.0);

 }

 void GraphDisplayerCanvas::updateScrollRegion()

 {

   double wx1, wy1, wx2, wy2;

   Gnome::Canvas::Item* pCanvasItem = root();

   pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);

   set_scroll_region(wx1, wy1, wx2, wy2);

 }