/*===== IMPORTANT =====This is sample code demonstrating API, technology or techniques in development.Although this sample code has been reviewed for technical accuracy, it is notfinal. Apple is supplying this information to help you plan for the adoption ofthe technologies and programming interfaces described herein. This informationis subject to change, and software implemented based on this sample code shouldbe tested with final operating system software and final documentation. Newerversions of this sample code may be provided with future seeds of the API ortechnology. For information about updates to this and other developerdocumentation, view the New & Updated sidebars in subsequent documentationseeds.=====================File: AppDelegate.mAbstract: UIApplication's delegate class, the central controller of theapplication. This object creates the user interface, configures the internalaccelerometer, and starts a timer for updating the display.Version: 1.6Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Inc.("Apple") in consideration of your agreement to the following terms, and youruse, installation, modification or redistribution of this Apple softwareconstitutes acceptance of these terms.  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All Rights Reserved.*/#import "AppDelegate.h"// Constant for the number of times per second (Hertz) to sample acceleration.#define kAccelerometerFrequency     40// Constant for the number of times per second (Hertz) the graph will be redrawn.#define kUpdateFrequency            15// AppDelegate class implementation.@implementation AppDelegate@synthesize window;@synthesize graphView;@synthesize toolbar;- (void)applicationDidFinishLaunching:(UIApplication*)application {    // Calculate the frames for the toolbar and the main view.    CGRect toolbarRect = CGRectMake(0, 431, 320, 49);    UIToolbar *aToolbar = [[UIToolbar alloc] initWithFrame:toolbarRect];    self.toolbar = aToolbar;    [aToolbar release];    [window addSubview:toolbar];    // Create each toolbar item...    // The pause item is a button for pausing updates to the view.    UIBarButtonItem *pauseItem = [[UIBarButtonItem alloc] initWithTitle:@"Pause" style:UIBarButtonItemStyleBordered target:self action:@selector(toggleRun:)];    pauseItem.width = 100.0;    // The high pass item toggles between enabled and disabled for filtering in the view.    UIBarButtonItem *highPassItem = [[UIBarButtonItem alloc] initWithTitle:@"Enable High-Pass Filter" style:UIBarButtonItemStyleBordered target:self action:@selector(toggleFiltering:)];    highPassItem.width = 200.0;    // Collect the items in a temporary array.    NSArray *items = [NSArray arrayWithObjects:pauseItem, highPassItem, nil];    [pauseItem release];    [highPassItem release];        // Pass the items to the toolbar.    [toolbar setItems:items];        // Show the window    [window makeKeyAndVisible];        // Configure and start the accelerometer    [[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / kAccelerometerFrequency)];    [[UIAccelerometer sharedAccelerometer] setDelegate:self];        // Auto-start drawing updates    [self toggleRun:nil];}// Release resources.- (void)dealloc {    [timer invalidate];    [toolbar release];    [graphView release];    [window release];        [super dealloc];}// UIAccelerometerDelegate method, called when the device accelerates.- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {    // Update the accelerometer graph view    if (timer) {        [graphView updateHistoryWithX:acceleration.x Y:acceleration.y Z:acceleration.z];    }}// Invoked when the user touches the toolbar button for Pause/Resume.- (void)toggleRun:(id)sender {    // Start or stop drawing updates    if (timer) {        // Stop and release the timer.        [timer invalidate];        timer = nil;    } else {        // This invokes the redraw mechanism in the GraphView via the setNeedsDisplay method.        timer = [NSTimer scheduledTimerWithTimeInterval:(1.0 / kUpdateFrequency) target:graphView                                                selector:@selector(setNeedsDisplay) userInfo:nil repeats:YES];    }    // Update toolbar    NSString *title = (timer) ? @"Pause" : @"Resume";    [[[toolbar items] objectAtIndex:0] setTitle:title];}// Invoked when the user touches the toolbar button for High Pass Filtering.- (void)toggleFiltering:(id)sender {    // Enable or disable filtering    [graphView setFilteringEnabled:![graphView isFilteringEnabled]];        // Update toolbar    NSString *title = ([graphView isFilteringEnabled]) ? @"Disable High-Pass Filter" : @"Enable High-Pass Filter";    [[[toolbar items] objectAtIndex:1] setTitle:title];}@end