annotate include/SDL_rect.h @ 2427:32b9909db651 gsoc2008_iphone

changed macro MAX_G_FORCE to SDL_IPHONE_MAX_GFORCE and moved it to the SDL_config_iphoneos.h file. This should allow users to convert between the Sint16 returned by polling the joystick and units of g-force, which better describe what is going on with the iPhone (and are what the iPhone OS actually gives you). This conversion wouldn't be necessary except that we'd need floating point to store everything as g-force.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Fri, 15 Aug 2008 00:46:58 +0000
parents 12ea0fdc0df2
children 99210400e8b9
rev   line source
2275
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /**
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24 * \file SDL_rect.h
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25 *
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26 * Header file for SDL_rect definition and management functions
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27 */
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28
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29 #ifndef _SDL_rect_h
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30 #define _SDL_rect_h
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31
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32 #include "SDL_stdinc.h"
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33 #include "SDL_error.h"
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34 #include "SDL_pixels.h"
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35 #include "SDL_rwops.h"
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36
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37 #include "begin_code.h"
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38 /* Set up for C function definitions, even when using C++ */
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39 #ifdef __cplusplus
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40 /* *INDENT-OFF* */
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41 extern "C" {
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42 /* *INDENT-ON* */
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43 #endif
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44
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45 /**
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46 * \struct SDL_Rect
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47 *
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48 * \brief A rectangle, with the origin at the upper left.
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49 *
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50 * \sa SDL_RectEmpty
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51 * \sa SDL_RectEquals
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52 * \sa SDL_HasIntersection
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53 * \sa SDL_IntersectRect
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54 * \sa SDL_UnionRect
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55 */
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56 typedef struct SDL_Rect
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57 {
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58 int x, y;
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59 int w, h;
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60 } SDL_Rect;
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61
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62 /**
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63 * \def SDL_RectEmpty()
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64 *
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65 * \brief Returns true if the rectangle has no area.
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66 */
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67 #define SDL_RectEmpty(X) (((X)->w <= 0) || ((X)->h <= 0))
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68
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69 /**
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70 * \def SDL_RectEquals()
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71 *
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72 * \brief Returns true if the two rectangles are equal.
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73 */
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74 #define SDL_RectEquals(A, B) (((A)->x == (B)->x) && ((A)->y == (B)->y) && \
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75 ((A)->w == (B)->w) && ((A)->h == (B)->h))
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76
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77 /**
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78 * \fn SDL_bool SDL_HasIntersection(const SDL_Rect * A, const SDL_Rect * B);
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79 *
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80 * \brief Determine whether two rectangles intersect.
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81 *
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82 * \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
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83 */
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84 extern DECLSPEC SDL_bool SDLCALL SDL_HasIntersection(const SDL_Rect * A,
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85 const SDL_Rect * B);
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86
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87 /**
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88 * \fn SDL_bool SDL_IntersectRect(const SDL_Rect * A, const SDL_Rect * B, SDL_Rect * result)
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89 *
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90 * \brief Calculate the intersection of two rectangles.
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91 *
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92 * \return SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
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93 */
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94 extern DECLSPEC SDL_bool SDLCALL SDL_IntersectRect(const SDL_Rect * A,
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95 const SDL_Rect * B,
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96 SDL_Rect * result);
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97
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98 /**
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99 * \fn void SDL_UnionRect(const SDL_Rect * A, const SDL_Rect * B, SDL_Rect * result)
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100 *
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101 * \brief Calculate the union of two rectangles
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102 */
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103 extern DECLSPEC void SDLCALL SDL_UnionRect(const SDL_Rect * A,
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104 const SDL_Rect * B,
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105 SDL_Rect * result);
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106
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107 /* Ends C function definitions when using C++ */
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108 #ifdef __cplusplus
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109 /* *INDENT-OFF* */
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110 }
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111 /* *INDENT-ON* */
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112 #endif
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113 #include "close_code.h"
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114
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115 #endif /* _SDL_rect_h */
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116
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117 /* vi: set ts=4 sw=4 expandtab: */