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annotate engine/core/util/math/angles.cpp @ 217:68ae8f4234ca

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* More compact ObjectSelector dialog
author cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
date Thu, 19 Mar 2009 01:40:51 +0000
parents 90005975cdbb
children
rev   line source
0
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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1 /***************************************************************************
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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2 * Copyright (C) 2005-2008 by the FIFE team *
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3 * http://www.fifengine.de *
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4 * This file is part of FIFE. *
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5 * *
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90005975cdbb * Final LGPL switch step by adjusting the file headers
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6 * FIFE is free software; you can redistribute it and/or *
90005975cdbb * Final LGPL switch step by adjusting the file headers
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7 * modify it under the terms of the GNU Lesser General Public *
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8 * License as published by the Free Software Foundation; either *
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9 * version 2.1 of the License, or (at your option) any later version. *
0
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10 * *
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11 * This library is distributed in the hope that it will be useful, *
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
90005975cdbb * Final LGPL switch step by adjusting the file headers
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14 * Lesser General Public License for more details. *
0
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15 * *
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16 * You should have received a copy of the GNU Lesser General Public *
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17 * License along with this library; if not, write to the *
0
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18 * Free Software Foundation, Inc., *
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19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
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20 ***************************************************************************/
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21
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22 // Standard C++ library includes
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23 #include <iostream>
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24
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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25 // 3rd party library includes
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26
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27 // FIFE includes
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28 // These includes are split up in two parts, separated by one empty line
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29 // First block: files included from the FIFE root src directory
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30 // Second block: files included from the same folder
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31 #include "angles.h"
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32
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33 namespace FIFE {
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34 int getIndexByAngle(int angle, const type_angle2id& angle2id, int& closestMatchingAngle) {
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35 int wangle = (360 + angle) % 360;
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36
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37 if (angle2id.size() == 0) {
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38 return -1;
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39 }
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40 if (angle2id.size() == 1) {
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41 closestMatchingAngle = angle2id.begin()->first;
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42 return angle2id.begin()->second;
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43 }
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44
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45 type_angle2id::const_iterator u(angle2id.upper_bound(wangle));
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46 type_angle2id::const_iterator tmp;
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47
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48 // take care of the forward wrapping case
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49 if (u == angle2id.end()) {
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50 int ud = wangle - (--u)->first;
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51 int ld = 360 - wangle + angle2id.begin()->first;
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52 if (ud > ld) {
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53 // wrapped value (first)
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54 closestMatchingAngle = angle2id.begin()->first;
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55 return angle2id.begin()->second;
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56 }
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57 // non-wrapped value
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58 closestMatchingAngle = u->first;
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59 return u->second;
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60 }
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61
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62 // take care of the backward wrapping case
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63 if (u == angle2id.begin()) {
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64 tmp = angle2id.end();
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65 tmp--;
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66 int ld = u->first - wangle;
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67 int ud = 360 - tmp->first + wangle;
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68 if (ud > ld) {
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69 // non-wrapped value (first)
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70 closestMatchingAngle = angle2id.begin()->first;
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71 return angle2id.begin()->second;
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72 }
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73 // wrapped value (last)
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74 closestMatchingAngle = tmp->first;
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75 return tmp->second;
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76 }
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77
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78 // value in the middle...
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79 int ud = u->first - wangle;
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80 int ucm = u->first;
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81 int ui = u->second;
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82 u--;
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83 int ld = wangle - u->first;
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84 int lcm = u->first;
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85 int li = u->second;
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86
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87 if (ud <= ld) {
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88 closestMatchingAngle = ucm;
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89 return ui;
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90 }
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91 closestMatchingAngle = lcm;
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92 return li;
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93 }
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94 }