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#import "MBXFrameTimeGraphView.h"
const CGFloat MBXFrameTimeExaggeration = 4.f * 1000.f;
const CGFloat MBXFrameTimeBarWidth = 4.f;
@interface MBXFrameTimeGraphView ()
@property (nonatomic) CAScrollLayer *scrollLayer;
@property (nonatomic) CAShapeLayer *thresholdLayer;
@property (nonatomic) CGFloat currentX;
@property (nonatomic) NSMutableArray<CAShapeLayer *> *barLayers;
@property (nonatomic) UIColor *safeColor;
@property (nonatomic) UIColor *warningColor;
@property (nonatomic) UIColor *dangerColor;
@end
@implementation MBXFrameTimeGraphView
- (instancetype)init {
if (self = [super init]) {
[self commonInit];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
if (self = [super initWithCoder:aDecoder]) {
[self commonInit];
}
return self;
}
- (void)commonInit {
self.userInteractionEnabled = NO;
self.layer.opacity = 0.9f;
self.scrollLayer = [CAScrollLayer layer];
self.scrollLayer.scrollMode = kCAScrollHorizontally;
self.scrollLayer.masksToBounds = YES;
[self.layer addSublayer:self.scrollLayer];
self.thresholdLayer = [CAShapeLayer layer];
self.thresholdLayer.fillColor = [UIColor darkGrayColor].CGColor;
[self.layer addSublayer:self.thresholdLayer];
self.barLayers = [NSMutableArray array];
self.safeColor = [UIColor colorWithRed:(CGFloat)(0.f/255.f) green:(CGFloat)(190.f/255.f) blue:(CGFloat)(123.f/255.f) alpha:1.f];
self.warningColor = [UIColor colorWithRed:(CGFloat)(255.f/255.f) green:(CGFloat)(154.f/255.f) blue:(CGFloat)(82.f/255.f) alpha:1.f];
self.dangerColor = [UIColor colorWithRed:(CGFloat)(255.f/255.f) green:(CGFloat)(91.f/255.f) blue:(CGFloat)(86.f/255.f) alpha:1.f];
}
- (void)layoutSubviews {
[super layoutSubviews];
if (!CGRectEqualToRect(self.scrollLayer.frame, self.bounds)) {
self.scrollLayer.frame = self.bounds;
CGRect thresholdLineRect = CGRectMake(0, self.frame.size.height - [self renderDurationTargetMilliseconds], self.frame.size.width, 1);
{
CGPathRef path = CGPathCreateWithRect(thresholdLineRect, nil);
self.thresholdLayer.path = path;
CGPathRelease(path);
}
}
}
- (void)updatePathWithFrameDuration:(CFTimeInterval)frameDuration {
[CATransaction begin];
[CATransaction setDisableActions:YES];
self.currentX += MBXFrameTimeBarWidth;
CAShapeLayer *bar = [self barWithFrameDuration:frameDuration];
bar.position = CGPointMake(self.currentX, self.frame.size.height);
[self.scrollLayer addSublayer:bar];
[self.barLayers addObject:bar];
[self.scrollLayer scrollToPoint:CGPointMake(self.currentX - self.frame.size.width, 0)];
[self removeStaleBars];
[CATransaction commit];
}
- (CGFloat)renderDurationTargetMilliseconds {
CGFloat maximumFramesPerSecond;
if (@available(iOS 10.3, *)) {
maximumFramesPerSecond = UIScreen.mainScreen.maximumFramesPerSecond;
} else {
// Not always strictly accurate, but works as an expedient approximation.
maximumFramesPerSecond = 60;
}
CGFloat target = (1.0 / maximumFramesPerSecond) * MBXFrameTimeExaggeration;
return [self roundedFloat:target];
}
- (CGFloat)roundedFloat:(CGFloat)f {
#if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
CGFloat scaleFactor = [UIScreen mainScreen].nativeScale;
#elif TARGET_OS_MAC
CGFloat scaleFactor = [NSScreen mainScreen].backingScaleFactor;
#endif
return round(f * scaleFactor) / scaleFactor;
}
- (CAShapeLayer *)barWithFrameDuration:(CFTimeInterval)frameDuration {
CAShapeLayer *bar = [CAShapeLayer layer];
CGRect barRect = CGRectMake(0, 0, MBXFrameTimeBarWidth, -(fminf(frameDuration * MBXFrameTimeExaggeration, self.frame.size.height)));
UIBezierPath *barPath = [UIBezierPath bezierPathWithRect:barRect];
bar.path = barPath.CGPath;
bar.fillColor = [self colorForFrameDuration:frameDuration].CGColor;
return bar;
}
- (UIColor *)colorForFrameDuration:(CFTimeInterval)frameDuration {
CGFloat renderDurationTargetMilliseconds = [self renderDurationTargetMilliseconds];
frameDuration *= MBXFrameTimeExaggeration;
if (frameDuration < renderDurationTargetMilliseconds && frameDuration > (renderDurationTargetMilliseconds * 0.75)) {
return self.warningColor;
} else if (frameDuration > renderDurationTargetMilliseconds) {
return self.dangerColor;
} else {
return self.safeColor;
}
}
- (void)removeStaleBars {
if (self.barLayers.count > (self.frame.size.width / MBXFrameTimeBarWidth * 3)) {
NSRange staleBarsRange = NSMakeRange(0, self.frame.size.width / MBXFrameTimeBarWidth);
NSArray *staleBars = [self.barLayers subarrayWithRange:staleBarsRange];
[staleBars makeObjectsPerformSelector:@selector(removeFromSuperlayer)];
[self.barLayers removeObjectsInRange:staleBarsRange];
}
}
@end
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