#import "MainViewController.h"

#import "GraphView.h"

#import "AccelerometerFilter.h"

#define kUpdateFrequency 60.0

#define kLocalizedPause NSLocalizedString(@"Pause","pause taking samples")

#define kLocalizedResume NSLocalizedString(@"Resume","resume taking samples")

@interface MainViewController()

-(void)changeFilter:(Class)filterClass;

@end

@implementation MainViewController

@synthesize unfiltered, filtered, pause, filterLabel;

-(void)viewDidLoad

{

[super viewDidLoad];

pause.possibleTitles = [NSSet setWithObjects:kLocalizedPause, kLocalizedResume, nil];

isPaused = NO;

useAdaptive = NO;

[self changeFilter:[LowpassFilter class]];

[[UIAccelerometer sharedAccelerometer] setUpdateInterval:1.0 / kUpdateFrequency];

[[UIAccelerometer sharedAccelerometer] setDelegate:self];

[unfiltered setIsAccessibilityElement:YES];

[unfiltered setAccessibilityLabel:NSLocalizedString(@"unfilteredGraph", @"")];

[filtered setIsAccessibilityElement:YES];

[filtered setAccessibilityLabel:NSLocalizedString(@"filteredGraph", @"")];

}

-(void)viewDidUnload

{

[super viewDidUnload];

self.unfiltered = nil;

self.filtered = nil;

self.pause = nil;

self.filterLabel = nil;

}

-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration

{

// Update the accelerometer graph view

if(!isPaused)

{

[filter addAcceleration:acceleration];

[unfiltered addX:acceleration.x y:acceleration.y z:acceleration.z];

[filtered addX:filter.x y:filter.y z:filter.z];

}

}

-(void)changeFilter:(Class)filterClass

{

// Ensure that the new filter class is different from the current one...

if(filterClass != [filter class])

{

// And if it is, release the old one and create a new one.

[filter release];

filter = [[filterClass alloc] initWithSampleRate:kUpdateFrequency cutoffFrequency:5.0];

// Set the adaptive flag

filter.adaptive = useAdaptive;

// And update the filterLabel with the new filter name.

filterLabel.text = filter.name;

}

}

-(IBAction)pauseOrResume:(id)sender

{

if(isPaused)

{

// If we're paused, then resume and set the title to "Pause"

isPaused = NO;

pause.title = kLocalizedPause;

}

else

{

// If we are not paused, then pause and set the title to "Resume"

isPaused = YES;

pause.title = kLocalizedResume;

}

// Inform accessibility clients that the pause/resume button has changed.

UIAccessibilityPostNotification(UIAccessibilityLayoutChangedNotification, nil);

}

-(IBAction)filterSelect:(id)sender

{

if([sender selectedSegmentIndex] == 0)

{

// Index 0 of the segment selects the lowpass filter

[self changeFilter:[LowpassFilter class]];

}

else

{

// Index 1 of the segment selects the highpass filter

[self changeFilter:[HighpassFilter class]];

}

// Inform accessibility clients that the filter has changed.

UIAccessibilityPostNotification(UIAccessibilityLayoutChangedNotification, nil);

}

-(IBAction)adaptiveSelect:(id)sender

{

// Index 1 is to use the adaptive filter, so if selected then set useAdaptive appropriately

useAdaptive = [sender selectedSegmentIndex] == 1;

// and update our filter and filterLabel

filter.adaptive = useAdaptive;

filterLabel.text = filter.name;

// Inform accessibility clients that the adaptive selection has changed.

UIAccessibilityPostNotification(UIAccessibilityLayoutChangedNotification, nil);

}

-(void)dealloc

{

// clean up everything.

[unfiltered release];

[filtered release];

[filterLabel release];

[pause release];

[super dealloc];

}