/* -*- C++ -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2003-2006

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 #include <graph_displayer_canvas.h>

 #include <cmath>

 void DigraphDisplayerCanvas::zoomIn()

 {

   set_pixels_per_unit(

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

   if(zoomtrack)

     {

       propertyChange(false, N_RADIUS);

       propertyChange(true, E_WIDTH);

     }

 }

 void DigraphDisplayerCanvas::zoomOut()

 {

   set_pixels_per_unit(

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

   if(zoomtrack)

     {

       propertyChange(true, E_WIDTH);

       propertyChange(false, N_RADIUS);

     }

 }

 void DigraphDisplayerCanvas::zoomFit()

 {

   updateScrollRegion();

   // get the height and width of the canvas

   Gtk::Allocation a = get_allocation();

   int aw = a.get_width();

   int ah = a.get_height();

   // get the bounding box of the digraph

   update_now();

   double x1, y1, x2, y2;

   root()->get_bounds(x1, y1, x2, y2);

   // fit the digraph to the window

   double ppu1 = (double) aw / fabs(x2 - x1);

   double ppu2 = (double) ah / fabs(y2 - y1);

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

   if(zoomtrack)

     {

       propertyChange(true, E_WIDTH);

       propertyChange(false, N_RADIUS);

     }

 }

 void DigraphDisplayerCanvas::zoom100()

 {

   updateScrollRegion();

   set_pixels_per_unit(1.0);

   if(zoomtrack)

     {

       propertyChange(true, E_WIDTH);

       propertyChange(false, N_RADIUS);

     }

 }

 void DigraphDisplayerCanvas::updateScrollRegion()

 {

   // get_bounds() yields something sane only when no updates are pending

   // and it returns a sufficient, not an exact bounding box

   update_now();

   double x1, y1, x2, y2;

   root()->get_bounds(x1, y1, x2, y2);

   set_scroll_region(x1, y1, x2, y2);

 }