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1 /* -*- C++ -*- |
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2 * |
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3 * This file is a part of LEMON, a generic C++ optimization library |
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4 * |
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5 * Copyright (C) 2003-2006 |
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6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 * |
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9 * Permission to use, modify and distribute this software is granted |
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10 * provided that this copyright notice appears in all copies. For |
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11 * precise terms see the accompanying LICENSE file. |
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12 * |
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13 * This software is provided "AS IS" with no warranty of any kind, |
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14 * express or implied, and with no claim as to its suitability for any |
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15 * purpose. |
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16 * |
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17 */ |
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18 |
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19 #include <graph_displayer_canvas.h> |
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20 #include <cmath> |
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21 |
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22 void DigraphDisplayerCanvas::zoomIn() |
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23 { |
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24 set_pixels_per_unit( |
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25 (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit()); |
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26 if(zoomtrack) |
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27 { |
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28 propertyChange(false, N_RADIUS); |
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29 propertyChange(true, E_WIDTH); |
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30 } |
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31 } |
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32 |
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33 void DigraphDisplayerCanvas::zoomOut() |
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34 { |
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35 set_pixels_per_unit( |
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36 (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit()); |
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37 if(zoomtrack) |
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38 { |
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39 propertyChange(true, E_WIDTH); |
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40 propertyChange(false, N_RADIUS); |
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41 } |
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42 } |
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43 |
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44 void DigraphDisplayerCanvas::zoomFit() |
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45 { |
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46 updateScrollRegion(); |
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47 |
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48 // get the height and width of the canvas |
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49 Gtk::Allocation a = get_allocation(); |
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50 int aw = a.get_width(); |
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51 int ah = a.get_height(); |
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52 |
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53 // get the bounding box of the digraph |
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54 update_now(); |
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55 double x1, y1, x2, y2; |
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56 root()->get_bounds(x1, y1, x2, y2); |
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57 |
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58 // fit the digraph to the window |
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59 double ppu1 = (double) aw / fabs(x2 - x1); |
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60 double ppu2 = (double) ah / fabs(y2 - y1); |
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61 set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2); |
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62 |
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63 if(zoomtrack) |
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64 { |
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65 propertyChange(true, E_WIDTH); |
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66 propertyChange(false, N_RADIUS); |
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67 } |
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68 } |
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69 |
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70 void DigraphDisplayerCanvas::zoom100() |
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71 { |
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72 updateScrollRegion(); |
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73 set_pixels_per_unit(1.0); |
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74 |
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75 if(zoomtrack) |
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76 { |
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77 propertyChange(true, E_WIDTH); |
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78 propertyChange(false, N_RADIUS); |
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79 } |
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80 } |
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81 |
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82 void DigraphDisplayerCanvas::updateScrollRegion() |
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83 { |
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84 // get_bounds() yields something sane only when no updates are pending |
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85 // and it returns a sufficient, not an exact bounding box |
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86 update_now(); |
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87 double x1, y1, x2, y2; |
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88 root()->get_bounds(x1, y1, x2, y2); |
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89 set_scroll_region(x1, y1, x2, y2); |
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90 } |