core-graphics

I am trying to make a rectangle using UIBezierPath . I adopted two different ways to draw it. Also, I increased the stroke width to 25 px. First method : Using closePath UIBezierPath *bpath = [UIBezierPath bezierPath]; [bpath moveToPoint:CGPointMake(x, y)]; [bpath addLineToPoint:CGPointMake(x + w, y)]; [bpath addLineToPoint:CGPointMake(x + w, y + h)]; [bpath addLineToPoint:CGPointMake(x, y + h)]; [bpath closePath]; Output: Second method : Closing the path manually UIBezierPath *bpath = [UIBezierPath bezierPath]; [bpath moveToPoint:CGPointMake(x, y)]; [bpath addLineToPoint:CGPointMake(x + w, y)

I'm animating a pendulum which swings from 0 degrees to max 200 degrees and then back again. The problem is that if the pendulum goes over 180 degrees, it returns to 0 by the shortest route which is to continue clockwise. And I'd like it to go anticlockwise. Here's my code: ('right' is a boolean which is TRUE when the pendulum is swinging from left to right) - (void)swingPendulum { CABasicAnimation *rotationAnimation; rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; if (right) rotationAnimation.toValue = [NSNumber numberWithFloat:degreesToRadians(kMax)];

I want my OSX app to call a function when the user's screen becomes available, ex: their computer wakes from sleep or the user turns on their screen. Basically any time the user goes from having no screen active to having one active, I would like my function to be called. I'm not sure if the best way to do this is to: Check for changes in sleep/wake state or Use CGDisplayReconfigurationCallback or Listen for a NSWorkspaceScreensDidWakeNotification Which of these seems like the best way to do this, or should I do something else entirely? Some kind of example Swift code would be really helpful

I'm having trouble performing bitwise operations with CGImageAlphaInfo and CGBitmapInfo in Swift. In particular, I don't know how to port this Objective-C code: bitmapInfo &= ~kCGBitmapAlphaInfoMask; bitmapInfo |= kCGImageAlphaNoneSkipFirst; The following straightforward Swift port produces the somewhat cryptic compiler error 'CGBitmapInfo' is not identical to 'Bool' on the last line: bitmapInfo &= ~CGBitmapInfo.AlphaInfoMask bitmapInfo |= CGImageAlphaInfo.NoneSkipFirst Looking at the source code I noticed that CGBitmapInfo is declared as a RawOptionSetType while CGImageAlphaInfo isn't. Maybe

I'm curious why functions like CGRectMake and CGPointMake exist and are widely used. when, instead, you can do: (CGRect){{x, y}, {width, height}} surely this is more efficient (though I'm guessing not by much) as there is no function call? Also you can set the origin and size like: (CGRect){origin, size} and as a mixture: (CGRect){origin, {width, height}} What is the reason for not using this, and preferring the Make functions? Kalle It isn't more efficient, actually. The CGRectMake function (and others) are declared as static inline , which means the compiler copy pastes the function code

This may be a really stupid question, but can someone tell me the difference between creating a CGContextRef using UIGraphicsBeginImageContext and using CGBitmapContextCreate for drawing to images? Especially now since UIKit drawing is thread safe I was wondering if there was any reason to use CGBitmapContextCreate over UIGraphicsBeginImageContext. According to Apple's UIKit Function Reference , which carries the cover date of the 15th November 2010, UIGraphicsBeginImageContext and related functions should still be called on the main thread only. The same text is repeated in the developer

Background: I am drawing on a UIImageView with Core Graphics. I would like to ultimately draw a text string over the core graphics drawing. This (hackingwithswift.com) method i used to draw the text to an image, set my imageView to that image, and then draw over with core graphics. But I want the text to overlay the core graphics drawing. Now I have moved to this https://stackoverflow.com/a/35574171/6337391 but it still isnt allowing me to write on top of my drawing. class MapViewController: UIViewController { @IBOutlet var imageView: UIImageView! func drawScale() { // establish 6 points to