kc3-lang/SDL/src/joystick/iphoneos/SDLUIAccelerationDelegate.m

• Show log

  Commit

• Hash : dad42067
  Author :
  Date : 2013-08-12T11:13:50
  

  Fixes #2022, do not resume on Android when surfaceChanged If the app is in landscape mode and the user presses the power button, a pause is followed immediately by a surfaceChanged event because the lock screen is shown in portrait mode. This triggers a "false" resume. So, we just pause and resume following the onWindowFocusChanged events. Also, wait for SDL_APP_WILLENTERBACKGROUND and SDL_APP_DIDENTERBACKGROUND before blocking the event pump.

Download

• src/joystick/iphoneos/SDLUIAccelerationDelegate.m

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  
  #import "SDLUIAccelerationDelegate.h"
  /* needed for SDL_IPHONE_MAX_GFORCE macro */
  #import "../../../include/SDL_config_iphoneos.h"
  
  static SDLUIAccelerationDelegate *sharedDelegate=nil;
  
  @implementation SDLUIAccelerationDelegate
  
  /*
      Returns a shared instance of the SDLUIAccelerationDelegate, creating the shared delegate if it doesn't exist yet.
  */
  +(SDLUIAccelerationDelegate *)sharedDelegate {
      if (sharedDelegate == nil) {
          sharedDelegate = [[SDLUIAccelerationDelegate alloc] init];
      }
      return sharedDelegate;
  }
  /*
      UIAccelerometerDelegate delegate method.  Invoked by the UIAccelerometer instance when it has new data for us.
      We just take the data and mark that we have new data available so that the joystick system will pump it to the
      events system when SDL_SYS_JoystickUpdate is called.
  */
  -(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
  
      x = acceleration.x;
      y = acceleration.y;
      z = acceleration.z;
  
      hasNewData = YES;
  }
  /*
      getLastOrientation -- put last obtained accelerometer data into Sint16 array
  
      Called from the joystick system when it needs the accelerometer data.
      Function grabs the last data sent to the accelerometer and converts it
      from floating point to Sint16, which is what the joystick system expects.
  
      To do the conversion, the data is first clamped onto the interval
      [-SDL_IPHONE_MAX_G_FORCE, SDL_IPHONE_MAX_G_FORCE], then the data is multiplied
      by MAX_SINT16 so that it is mapped to the full range of an Sint16.
  
      You can customize the clamped range of this function by modifying the
      SDL_IPHONE_MAX_GFORCE macro in SDL_config_iphoneos.h.
  
      Once converted to Sint16, the accelerometer data no longer has coherent units.
      You can convert the data back to units of g-force by multiplying it
      in your application's code by SDL_IPHONE_MAX_GFORCE / 0x7FFF.
   */
  -(void)getLastOrientation:(Sint16 *)data {
  
      #define MAX_SINT16 0x7FFF
  
      /* clamp the data */
      if (x > SDL_IPHONE_MAX_GFORCE) x = SDL_IPHONE_MAX_GFORCE;
      else if (x < -SDL_IPHONE_MAX_GFORCE) x = -SDL_IPHONE_MAX_GFORCE;
      if (y > SDL_IPHONE_MAX_GFORCE) y = SDL_IPHONE_MAX_GFORCE;
      else if (y < -SDL_IPHONE_MAX_GFORCE) y = -SDL_IPHONE_MAX_GFORCE;
      if (z > SDL_IPHONE_MAX_GFORCE) z = SDL_IPHONE_MAX_GFORCE;
      else if (z < -SDL_IPHONE_MAX_GFORCE) z = -SDL_IPHONE_MAX_GFORCE;
  
      /* pass in data mapped to range of SInt16 */
      data[0] = (x / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16;
      data[1] = (y / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16;
      data[2] = (z / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16;
  
  }
  
  /*
      Initialize SDLUIAccelerationDelegate.  Since we don't have any data yet,
      just set our last received data to zero, and indicate we don't have any;
  */
  -(id)init {
      self = [super init];
      x = y = z = 0.0;
      hasNewData = NO;
      return self;
  }
  
  -(void)dealloc {
      sharedDelegate = nil;
      [self shutdown];
      [super dealloc];
  }
  
  /*
      Lets our delegate start receiving accelerometer updates.
  */
  -(void)startup {
      [UIAccelerometer sharedAccelerometer].delegate = self;
      isRunning = YES;
  }
  /*
      Stops our delegate from receiving accelerometer updates.
  */
  -(void)shutdown {
      if ([UIAccelerometer sharedAccelerometer].delegate == self) {
          [UIAccelerometer sharedAccelerometer].delegate = nil;
      }
      isRunning = NO;
  }
  /*
      Our we currently receiving accelerometer updates?
  */
  -(BOOL)isRunning {
      return isRunning;
  }
  /*
      Do we have any data that hasn't been pumped into SDL's event system?
  */
  -(BOOL)hasNewData {
      return hasNewData;
  }
  /*
      When the joystick system grabs the new data, it sets this to NO.
  */
  -(void)setHasNewData:(BOOL)value {
      hasNewData = value;
  }
  
  @end
  

Download