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//
// AccelerometerViewController.m
// StudyiOS
//
// Created by on 11-10-13.
// Copyright (c) 2011年 ZhangYiCheng. All rights reserved.
//
#import "AccelerometerViewController.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 AccelerometerViewController()
// Sets up a new filter. Since the filter's class matters and not a particular instance
// we just pass in the class and -changeFilter: will setup the proper filter.
-(void)changeFilter:(Class)filterClass;
@end
@implementation AccelerometerViewController
@synthesize unfiltered, filtered, pause, filterLabel;
// Implement viewDidLoad to do additional setup after loading the view.
-(void)viewDidLoad
{
[super viewDidLoad];
// 增加Code按钮，可跳转至教学页面
UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithTitle:@"Code" style:UIBarButtonItemStyleBordered target:self action:@selector(code)];
self.navigationItem.rightBarButtonItem = item;
isPaused = NO;
useAdaptive = NO;
// 设置过滤器
[self changeFilter:[LowpassFilter class]];
// 设置加速计采集频率(单位:秒)
[[UIAccelerometer sharedAccelerometer] setUpdateInterval:1.0 / kUpdateFrequency];
// 设置委托(注意对象销毁时要将委托设置为空)
[[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;
}
// 本对象销毁时将Accelerometer的委托设置为空，否则会继续触发委托方法导致报错
- (void)dealloc
{
[[UIAccelerometer sharedAccelerometer] setDelegate:nil];
}
// 加速计委托方法，根据设置的采集频率定时调用
-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{
//NSLog([NSString stringWithFormat:@"%@", [NSDate date]]);
if (acceleration == nil) {
return;
}
// Update the accelerometer graph view
if(!isPaused)
{
// 过滤加速计数据
[filter addAcceleration:acceleration];
// 取3个方向的值
[unfiltered addX:acceleration.x y:acceleration.y z:acceleration.z];
// 过滤后绘图
[filtered addX:filter.x y:filter.y z:filter.z];
}
}
// 改变过滤器
-(void)changeFilter:(Class)filterClass
{
// Ensure that the new filter class is different from the current one...
if(filterClass != [filter class])
{
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;
}
}
// 开始与暂停
-(IBAction)pauseOrResume:(id)sender
{
if(isPaused)
{
// If we're paused, then resume and set the title to "Pause"
isPaused = NO;
[pause setTitle:kLocalizedPause forState:UIControlStateNormal];
[pause resignFirstResponder];
}
else
{
// If we are not paused, then pause and set the title to "Resume"
isPaused = YES;
[pause setTitle:kLocalizedResume forState:UIControlStateNormal];
}
// 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);
}
// 跳转至教学页面
- (void)code
{
CodeViewController *controller = [[CodeViewController alloc] initWithNibName:@"CodeViewController" bundle:nil];
NSString *name = [NSString stringWithUTF8String:object_getClassName(self)];
controller.className = name;
[self.navigationController pushViewController:controller animated:YES];
}
@end