/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#import "SDLUIAccelerationDelegate.h"
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/* needed for SDL_IPHONE_MAX_GFORCE macro */
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#import "../../../include/SDL_config_iphoneos.h"
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static SDLUIAccelerationDelegate *sharedDelegate=nil;
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@implementation SDLUIAccelerationDelegate
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/*
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Returns a shared instance of the SDLUIAccelerationDelegate, creating the shared delegate if it doesn't exist yet.
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*/
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+(SDLUIAccelerationDelegate *)sharedDelegate {
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if (sharedDelegate == nil) {
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sharedDelegate = [[SDLUIAccelerationDelegate alloc] init];
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}
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return sharedDelegate;
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}
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/*
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UIAccelerometerDelegate delegate method. Invoked by the UIAccelerometer instance when it has new data for us.
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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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events system when SDL_SYS_JoystickUpdate is called.
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*/
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-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
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x = acceleration.x;
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y = acceleration.y;
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z = acceleration.z;
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hasNewData = YES;
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}
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/*
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getLastOrientation -- put last obtained accelerometer data into Sint16 array
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Called from the joystick system when it needs the accelerometer data.
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Function grabs the last data sent to the accelerometer and converts it
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from floating point to Sint16, which is what the joystick system expects.
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To do the conversion, the data is first clamped onto the interval
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[-SDL_IPHONE_MAX_G_FORCE, SDL_IPHONE_MAX_G_FORCE], then the data is multiplied
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by MAX_SINT16 so that it is mapped to the full range of an Sint16.
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You can customize the clamped range of this function by modifying the
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SDL_IPHONE_MAX_GFORCE macro in SDL_config_iphoneos.h.
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Once converted to Sint16, the accelerometer data no longer has coherent units.
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You can convert the data back to units of g-force by multiplying it
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in your application's code by SDL_IPHONE_MAX_GFORCE / 0x7FFF.
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*/
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-(void)getLastOrientation:(Sint16 *)data {
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#define MAX_SINT16 0x7FFF
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/* clamp the data */
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if (x > SDL_IPHONE_MAX_GFORCE) x = SDL_IPHONE_MAX_GFORCE;
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else if (x < -SDL_IPHONE_MAX_GFORCE) x = -SDL_IPHONE_MAX_GFORCE;
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if (y > SDL_IPHONE_MAX_GFORCE) y = SDL_IPHONE_MAX_GFORCE;
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else if (y < -SDL_IPHONE_MAX_GFORCE) y = -SDL_IPHONE_MAX_GFORCE;
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if (z > SDL_IPHONE_MAX_GFORCE) z = SDL_IPHONE_MAX_GFORCE;
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else if (z < -SDL_IPHONE_MAX_GFORCE) z = -SDL_IPHONE_MAX_GFORCE;
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/* pass in data mapped to range of SInt16 */
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data[0] = (x / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16;
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data[1] = (y / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16;
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data[2] = (z / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16;
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}
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/*
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Initialize SDLUIAccelerationDelegate. Since we don't have any data yet,
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just set our last received data to zero, and indicate we don't have any;
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*/
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-(id)init {
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self = [super init];
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x = y = z = 0.0;
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hasNewData = NO;
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return self;
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}
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-(void)dealloc {
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sharedDelegate = nil;
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[self shutdown];
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[super dealloc];
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}
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/*
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Lets our delegate start receiving accelerometer updates.
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*/
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-(void)startup {
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[UIAccelerometer sharedAccelerometer].delegate = self;
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isRunning = YES;
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}
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/*
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Stops our delegate from receiving accelerometer updates.
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*/
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-(void)shutdown {
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if ([UIAccelerometer sharedAccelerometer].delegate == self) {
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[UIAccelerometer sharedAccelerometer].delegate = nil;
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}
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isRunning = NO;
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}
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/*
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Our we currently receiving accelerometer updates?
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*/
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-(BOOL)isRunning {
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return isRunning;
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}
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/*
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Do we have any data that hasn't been pumped into SDL's event system?
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*/
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-(BOOL)hasNewData {
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return hasNewData;
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}
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/*
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When the joystick system grabs the new data, it sets this to NO.
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*/
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-(void)setHasNewData:(BOOL)value {
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hasNewData = value;
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}
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@end
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