annotate src/joystick/iphoneos/SDLUIAccelerationDelegate.m @ 5081:f2d8e0b59cca

Trying to close Andreas' branch again.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 23 Jan 2011 22:34:19 -0800
parents 99210400e8b9
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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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