#include "graph_displayer_canvas.h"

#include "broken_edge.h"

#include <cmath>

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);

}