1 /* $Id$ */ |
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2 |
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3 /** @file zoom.hpp */ |
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4 |
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5 #ifndef ZOOM_HPP |
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6 #define ZOOM_HPP |
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7 |
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8 #include "core/enum_type.hpp" |
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9 |
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10 enum ZoomLevel { |
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11 /* Our possible zoom-levels */ |
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12 ZOOM_LVL_BEGIN = 0, |
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13 ZOOM_LVL_NORMAL = 0, |
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14 ZOOM_LVL_OUT_2X, |
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15 ZOOM_LVL_OUT_4X, |
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16 ZOOM_LVL_OUT_8X, |
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17 ZOOM_LVL_END, |
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18 |
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19 /* Here we define in which zoom viewports are */ |
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20 ZOOM_LVL_VIEWPORT = ZOOM_LVL_NORMAL, |
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21 ZOOM_LVL_NEWS = ZOOM_LVL_NORMAL, |
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22 ZOOM_LVL_INDUSTRY = ZOOM_LVL_OUT_2X, |
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23 ZOOM_LVL_TOWN = ZOOM_LVL_OUT_2X, |
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24 ZOOM_LVL_AIRCRAFT = ZOOM_LVL_NORMAL, |
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25 ZOOM_LVL_SHIP = ZOOM_LVL_NORMAL, |
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26 ZOOM_LVL_TRAIN = ZOOM_LVL_NORMAL, |
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27 ZOOM_LVL_ROADVEH = ZOOM_LVL_NORMAL, |
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28 ZOOM_LVL_WORLD_SCREENSHOT = ZOOM_LVL_NORMAL, |
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29 |
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30 ZOOM_LVL_DETAIL = ZOOM_LVL_OUT_2X, ///< All zoomlevels below or equal to this, will result in details on the screen, like road-work, ... |
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31 |
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32 ZOOM_LVL_MIN = ZOOM_LVL_NORMAL, |
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33 ZOOM_LVL_MAX = ZOOM_LVL_OUT_8X, |
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34 }; |
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35 |
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36 extern ZoomLevel _saved_scrollpos_zoom; |
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37 |
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38 DECLARE_POSTFIX_INCREMENT(ZoomLevel) |
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39 |
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40 /** |
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41 * Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL) |
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42 * When shifting right, value is rounded up |
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43 * @param value value to shift |
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44 * @param zoom zoom level to shift to |
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45 * @return shifted value |
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46 */ |
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47 static inline int ScaleByZoom(int value, ZoomLevel zoom) |
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48 { |
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49 if (zoom == ZOOM_LVL_NORMAL) return value; |
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50 int izoom = zoom - ZOOM_LVL_NORMAL; |
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51 return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : (value + (1 << -izoom) - 1) >> -izoom; |
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52 } |
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53 |
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54 /** |
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55 * Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL) |
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56 * When shifting right, value is rounded up |
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57 * @param value value to shift |
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58 * @param zoom zoom level to shift to |
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59 * @return shifted value |
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60 */ |
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61 static inline int UnScaleByZoom(int value, ZoomLevel zoom) |
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62 { |
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63 if (zoom == ZOOM_LVL_NORMAL) return value; |
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64 int izoom = zoom - ZOOM_LVL_NORMAL; |
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65 return (zoom > ZOOM_LVL_NORMAL) ? (value + (1 << izoom) - 1) >> izoom : value << -izoom; |
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66 } |
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67 |
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68 /** |
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69 * Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL) |
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70 * @param value value to shift |
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71 * @param zoom zoom level to shift to |
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72 * @return shifted value |
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73 */ |
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74 static inline int ScaleByZoomLower(int value, ZoomLevel zoom) |
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75 { |
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76 if (zoom == ZOOM_LVL_NORMAL) return value; |
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77 int izoom = zoom - ZOOM_LVL_NORMAL; |
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78 return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : value >> -izoom; |
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79 } |
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80 |
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81 /** |
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82 * Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL) |
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83 * @param value value to shift |
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84 * @param zoom zoom level to shift to |
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85 * @return shifted value |
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86 */ |
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87 static inline int UnScaleByZoomLower(int value, ZoomLevel zoom) |
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88 { |
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89 if (zoom == ZOOM_LVL_NORMAL) return value; |
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90 int izoom = zoom - ZOOM_LVL_NORMAL; |
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91 return (zoom > ZOOM_LVL_NORMAL) ? value >> izoom : value << -izoom; |
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92 } |
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93 |
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94 #endif /* ZOOM_HPP */ |
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