Mercurial > sdl-ios-xcode
annotate src/joystick/iphoneos/SDLUIAccelerationDelegate.m @ 5262:956d42855c92
Finished removing unused leak detection code.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 11 Feb 2011 14:42:06 -0800 |
parents | 99210400e8b9 |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
2859 | 3 Copyright (C) 1997-2009 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 #import "SDLUIAccelerationDelegate.h" |
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24 /* needed for SDL_IPHONE_MAX_GFORCE macro */ |
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25 #import "../../../include/SDL_config_iphoneos.h" |
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26 |
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27 static SDLUIAccelerationDelegate *sharedDelegate=nil; |
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28 |
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29 @implementation SDLUIAccelerationDelegate |
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30 |
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31 /* |
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32 Returns a shared instance of the SDLUIAccelerationDelegate, creating the shared delegate if it doesn't exist yet. |
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33 */ |
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34 +(SDLUIAccelerationDelegate *)sharedDelegate { |
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35 if (sharedDelegate == nil) { |
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36 sharedDelegate = [[SDLUIAccelerationDelegate alloc] init]; |
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37 } |
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38 return sharedDelegate; |
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39 } |
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40 /* |
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41 UIAccelerometerDelegate delegate method. Invoked by the UIAccelerometer instance when it has new data for us. |
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42 We just take the data and mark that we have new data available so that the joystick system will pump it to the |
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43 events system when SDL_SYS_JoystickUpdate is called. |
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44 */ |
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45 -(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration { |
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46 |
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47 x = acceleration.x; |
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48 y = acceleration.y; |
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49 z = acceleration.z; |
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50 |
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51 hasNewData = YES; |
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52 } |
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53 /* |
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54 getLastOrientation -- put last obtained accelerometer data into Sint16 array |
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55 |
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56 Called from the joystick system when it needs the accelerometer data. |
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57 Function grabs the last data sent to the accelerometer and converts it |
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58 from floating point to Sint16, which is what the joystick system expects. |
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59 |
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60 To do the conversion, the data is first clamped onto the interval |
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61 [-SDL_IPHONE_MAX_G_FORCE, SDL_IPHONE_MAX_G_FORCE], then the data is multiplied |
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62 by MAX_SINT16 so that it is mapped to the full range of an Sint16. |
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63 |
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64 You can customize the clamped range of this function by modifying the |
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65 SDL_IPHONE_MAX_GFORCE macro in SDL_config_iphoneos.h. |
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66 |
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67 Once converted to Sint16, the accelerometer data no longer has coherent units. |
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68 You can convert the data back to units of g-force by multiplying it |
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69 in your application's code by SDL_IPHONE_MAX_GFORCE / 0x7FFF. |
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70 */ |
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71 -(void)getLastOrientation:(Sint16 *)data { |
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72 |
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73 #define MAX_SINT16 0x7FFF |
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74 |
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75 /* clamp the data */ |
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76 if (x > SDL_IPHONE_MAX_GFORCE) x = SDL_IPHONE_MAX_GFORCE; |
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77 else if (x < -SDL_IPHONE_MAX_GFORCE) x = -SDL_IPHONE_MAX_GFORCE; |
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78 if (y > SDL_IPHONE_MAX_GFORCE) y = SDL_IPHONE_MAX_GFORCE; |
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79 else if (y < -SDL_IPHONE_MAX_GFORCE) y = -SDL_IPHONE_MAX_GFORCE; |
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80 if (z > SDL_IPHONE_MAX_GFORCE) z = SDL_IPHONE_MAX_GFORCE; |
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81 else if (z < -SDL_IPHONE_MAX_GFORCE) z = -SDL_IPHONE_MAX_GFORCE; |
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82 |
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83 /* pass in data mapped to range of SInt16 */ |
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84 data[0] = (x / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16; |
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85 data[1] = (y / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16; |
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86 data[2] = (z / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16; |
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87 |
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88 } |
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89 |
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90 /* |
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91 Initialize SDLUIAccelerationDelegate. Since we don't have any data yet, |
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92 just set our last received data to zero, and indicate we don't have any; |
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93 */ |
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94 -(id)init { |
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95 self = [super init]; |
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96 x = y = z = 0.0; |
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97 hasNewData = NO; |
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98 return self; |
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99 } |
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100 |
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101 -(void)dealloc { |
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102 sharedDelegate = nil; |
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103 [self shutdown]; |
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104 [super dealloc]; |
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105 } |
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106 |
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107 /* |
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108 Lets our delegate start receiving accelerometer updates. |
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109 */ |
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110 -(void)startup { |
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111 [UIAccelerometer sharedAccelerometer].delegate = self; |
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112 isRunning = YES; |
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113 } |
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114 /* |
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115 Stops our delegate from receiving accelerometer updates. |
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116 */ |
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117 -(void)shutdown { |
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118 if ([UIAccelerometer sharedAccelerometer].delegate == self) { |
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119 [UIAccelerometer sharedAccelerometer].delegate = nil; |
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120 } |
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121 isRunning = NO; |
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122 } |
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123 /* |
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124 Our we currently receiving accelerometer updates? |
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125 */ |
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126 -(BOOL)isRunning { |
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127 return isRunning; |
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128 } |
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129 /* |
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130 Do we have any data that hasn't been pumped into SDL's event system? |
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131 */ |
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132 -(BOOL)hasNewData { |
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133 return hasNewData; |
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134 } |
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135 /* |
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136 When the joystick system grabs the new data, it sets this to NO. |
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137 */ |
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138 -(void)setHasNewData:(BOOL)value { |
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139 hasNewData = value; |
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140 } |
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141 |
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142 @end |