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