hegyi@1: /* -*- C++ -*-
hegyi@1:  *
hegyi@1:  * This file is a part of LEMON, a generic C++ optimization library
hegyi@1:  *
hegyi@1:  * Copyright (C) 2003-2006
hegyi@1:  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
hegyi@1:  * (Egervary Research Group on Combinatorial Optimization, EGRES).
hegyi@1:  *
hegyi@1:  * Permission to use, modify and distribute this software is granted
hegyi@1:  * provided that this copyright notice appears in all copies. For
hegyi@1:  * precise terms see the accompanying LICENSE file.
hegyi@1:  *
hegyi@1:  * This software is provided "AS IS" with no warranty of any kind,
hegyi@1:  * express or implied, and with no claim as to its suitability for any
hegyi@1:  * purpose.
hegyi@1:  *
hegyi@1:  */
hegyi@1: 
hegyi@1: #include <graph_displayer_canvas.h>
hegyi@1: #include <cmath>
hegyi@1: 
hegyi@1: void DigraphDisplayerCanvas::zoomIn()
hegyi@1: {
hegyi@1:   set_pixels_per_unit(
hegyi@1:       (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());
hegyi@1:   if(zoomtrack)
hegyi@1:     {
hegyi@1:       propertyChange(false, N_RADIUS);
hegyi@1:       propertyChange(true, E_WIDTH);
hegyi@1:     }
hegyi@1: }
hegyi@1: 
hegyi@1: void DigraphDisplayerCanvas::zoomOut()
hegyi@1: {
hegyi@1:   set_pixels_per_unit(
hegyi@1:       (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());
hegyi@1:   if(zoomtrack)
hegyi@1:     {
hegyi@1:       propertyChange(true, E_WIDTH);
hegyi@1:       propertyChange(false, N_RADIUS);
hegyi@1:     }
hegyi@1: }
hegyi@1: 
hegyi@1: void DigraphDisplayerCanvas::zoomFit()
hegyi@1: {
hegyi@1:   updateScrollRegion();
hegyi@1: 
hegyi@1:   // get the height and width of the canvas
hegyi@1:   Gtk::Allocation a = get_allocation();
hegyi@1:   int aw = a.get_width();
hegyi@1:   int ah = a.get_height();
hegyi@1: 
hegyi@1:   // get the bounding box of the digraph
hegyi@1:   update_now();
hegyi@1:   double x1, y1, x2, y2;
hegyi@1:   root()->get_bounds(x1, y1, x2, y2);
hegyi@1: 
hegyi@1:   // fit the digraph to the window
hegyi@1:   double ppu1 = (double) aw / fabs(x2 - x1);
hegyi@1:   double ppu2 = (double) ah / fabs(y2 - y1);
hegyi@1:   set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);
hegyi@1: 
hegyi@1:   if(zoomtrack)
hegyi@1:     {
hegyi@1:       propertyChange(true, E_WIDTH);
hegyi@1:       propertyChange(false, N_RADIUS);
hegyi@1:     }
hegyi@1: }
hegyi@1: 
hegyi@1: void DigraphDisplayerCanvas::zoom100()
hegyi@1: {
hegyi@1:   updateScrollRegion();
hegyi@1:   set_pixels_per_unit(1.0);
hegyi@1: 
hegyi@1:   if(zoomtrack)
hegyi@1:     {
hegyi@1:       propertyChange(true, E_WIDTH);
hegyi@1:       propertyChange(false, N_RADIUS);
hegyi@1:     }
hegyi@1: }
hegyi@1: 
hegyi@1: void DigraphDisplayerCanvas::updateScrollRegion()
hegyi@1: {
hegyi@1:   // get_bounds() yields something sane only when no updates are pending
hegyi@1:   // and it returns a sufficient, not an exact bounding box
hegyi@1:   update_now();
hegyi@1:   double x1, y1, x2, y2;
hegyi@1:   root()->get_bounds(x1, y1, x2, y2);
hegyi@1:   set_scroll_region(x1, y1, x2, y2);
hegyi@1: }