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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "TapLatencyController.h"
#import "NSArray+Extensions.h"
#import "UIAlertView+Extensions.h"
#import "WALTAppDelegate.h"
#import "WALTClient.h"
#import "WALTLogger.h"
#import "WALTTouch.h"
@interface TapLatencyController ()
- (void)updateCountDisplay;
- (void)processEvent:(UIEvent *)event;
- (void)appendToLogView:(NSString *)string;
- (void)computeStatisticsForPhase:(UITouchPhase)phase;
@end
@implementation TapLatencyController {
WALTClient *_client;
WALTLogger *_logger;
// Statistics
unsigned int _downCount;
unsigned int _downCountRecorded;
unsigned int _upCount;
unsigned int _upCountRecorded;
NSMutableArray<WALTTouch *> *_touches;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.logView.selectable = YES;
self.logView.text = [NSString string];
self.logView.selectable = NO;
_logger = [WALTLogger sessionLogger];
_client = ((WALTAppDelegate *)[UIApplication sharedApplication].delegate).client;
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[_logger appendString:@"TAPLATENCY\n"];
[self reset:nil];
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
[self processEvent:event];
[self updateCountDisplay];
}
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
[self processEvent:event];
[self updateCountDisplay];
}
- (void)updateCountDisplay {
NSString *counts = [NSString stringWithFormat:@"N ↓%u (%u) ↑%u (%u)",
_downCountRecorded, _downCount, _upCountRecorded, _upCount];
self.countLabel.text = counts;
}
- (void)processEvent:(UIEvent *)event {
// TODO(pquinn): Pick first/last coalesced touch?
NSTimeInterval kernelTime = event.timestamp;
NSTimeInterval callbackTime = _client.currentTime;
NSError *error = nil;
NSTimeInterval physicalTime = [_client lastShockTimeWithError:&error];
if (physicalTime == -1) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"WALT Connection Error" error:error];
[alert show];
return;
}
WALTTouch *touch = [[WALTTouch alloc] initWithEvent:event];
touch.callbackTime = callbackTime;
touch.physicalTime = physicalTime;
NSString *actionString = nil;
if (touch.phase == UITouchPhaseBegan) {
_downCount += 1;
actionString = @"ACTION_DOWN";
} else {
_upCount += 1;
actionString = @"ACTION_UP";
}
if (physicalTime == 0) {
[_logger appendFormat:@"%@\tX\tno shock\n", actionString];
[self appendToLogView:[NSString stringWithFormat:@"%@: No shock detected\n", actionString]];
return;
}
NSTimeInterval physicalToKernel = kernelTime - physicalTime;
NSTimeInterval kernelToCallback = callbackTime - kernelTime;
if (physicalToKernel < 0 || physicalToKernel > 0.2) {
[_logger appendFormat:@"%@\tX\tbogus kernelTime\t%f\n", actionString, physicalToKernel];
[self appendToLogView:
[NSString stringWithFormat:@"%@: Bogus P → K: %.3f s\n", actionString, physicalToKernel]];
return;
}
[_logger appendFormat:@"%@\tO\t%f\t%f\t%f\n",
actionString, _client.baseTime, physicalToKernel, kernelToCallback];
[self appendToLogView:
[NSString stringWithFormat:@"%@: P → K: %.3f s; K → C: %.3f s\n",
actionString, physicalToKernel, kernelToCallback]];
[_touches addObject:touch];
if (touch.phase == UITouchPhaseBegan) {
_downCountRecorded += 1;
} else {
_upCountRecorded += 1;
}
}
- (IBAction)reset:(id)sender {
_downCount = 0;
_downCountRecorded = 0;
_upCount = 0;
_upCountRecorded = 0;
[self updateCountDisplay];
_touches = [[NSMutableArray<WALTTouch *> alloc] init];
NSError *error = nil;
if (![_client syncClocksWithError:&error]) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"WALT Connection Error" error:error];
[alert show];
}
[_logger appendString:@"RESET\n"];
[self appendToLogView:@"===========================================\n"];
}
- (IBAction)computeStatistics:(id)sender {
[self appendToLogView:@"-------------------------------------------\n"];
[self appendToLogView:@"Medians:\n"];
[self computeStatisticsForPhase:UITouchPhaseBegan];
[self computeStatisticsForPhase:UITouchPhaseEnded];
[self reset:sender];
}
- (void)computeStatisticsForPhase:(UITouchPhase)phase {
NSMutableArray<NSNumber *> *p2k = [[NSMutableArray<NSNumber *> alloc] init];
NSMutableArray<NSNumber *> *k2c = [[NSMutableArray<NSNumber *> alloc] init];
for (WALTTouch *touch in _touches) {
if (touch.phase != phase) {
continue;
}
[p2k addObject:[NSNumber numberWithDouble:touch.kernelTime - touch.physicalTime]];
[k2c addObject:[NSNumber numberWithDouble:touch.callbackTime - touch.kernelTime]];
}
NSNumber *p2kMedian = [p2k medianValue];
NSNumber *k2cMedian = [k2c medianValue];
NSString *actionString = (phase == UITouchPhaseBegan ? @"ACTION_DOWN" : @"ACTION_UP");
[self appendToLogView:
[NSString stringWithFormat:@"%@: P → K: %.3f s; K → C: %.3f s\n",
actionString, p2kMedian.doubleValue, k2cMedian.doubleValue]];
}
- (void)appendToLogView:(NSString*)string {
self.logView.selectable = YES;
self.logView.text = [self.logView.text stringByAppendingString:string];
[self.logView scrollRangeToVisible:NSMakeRange(self.logView.text.length - 2, 1)];
self.logView.selectable = NO;
}
@end
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