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annotate src/zoom.hpp @ 7272:dc7fb38ec443 draft

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(svn r10601) -Codechange: store (and use) the type of stations instead of hardcoding station types by graphics IDs.
author rubidium <rubidium@openttd.org>
date Mon, 16 Jul 2007 23:55:22 +0000
parents 735550a14c63
children 63c86d0b97e7
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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 enum ZoomLevel {
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9 /* Our possible zoom-levels */
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10 ZOOM_LVL_NORMAL = 0,
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11 ZOOM_LVL_OUT_2X,
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12 ZOOM_LVL_OUT_4X,
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13 ZOOM_LVL_OUT_8X,
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14 ZOOM_LVL_END,
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15
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16 /* Here we define in which zoom viewports are */
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17 ZOOM_LVL_VIEWPORT = ZOOM_LVL_NORMAL,
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18 ZOOM_LVL_NEWS = ZOOM_LVL_NORMAL,
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19 ZOOM_LVL_INDUSTRY = ZOOM_LVL_OUT_2X,
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20 ZOOM_LVL_TOWN = ZOOM_LVL_OUT_2X,
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21 ZOOM_LVL_AIRCRAFT = ZOOM_LVL_NORMAL,
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22 ZOOM_LVL_SHIP = ZOOM_LVL_NORMAL,
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23 ZOOM_LVL_TRAIN = ZOOM_LVL_NORMAL,
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24 ZOOM_LVL_ROADVEH = ZOOM_LVL_NORMAL,
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25 ZOOM_LVL_WORLD_SCREENSHOT = ZOOM_LVL_NORMAL,
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26
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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, ...
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28
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29 ZOOM_LVL_MIN = ZOOM_LVL_NORMAL,
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30 ZOOM_LVL_MAX = ZOOM_LVL_OUT_8X,
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31 };
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32
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33 extern ZoomLevel _saved_scrollpos_zoom;
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34
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35 static inline int ScaleByZoom(int value, ZoomLevel zoom)
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36 {
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37 if (zoom == ZOOM_LVL_NORMAL) return value;
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38 int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL;
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39 return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : (value + (1 << -izoom) - 1) >> -izoom;
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40 }
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42 static inline int UnScaleByZoom(int value, ZoomLevel zoom)
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43 {
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44 if (zoom == ZOOM_LVL_NORMAL) return value;
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45 int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL;
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46 return (zoom > ZOOM_LVL_NORMAL) ? (value + (1 << izoom) - 1) >> izoom : value << -izoom;
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47 }
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48
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49 #endif /* ZOOM_HPP */