core-graphics

I'm using the following function to apply a pulse effect to a view - (void)pulse { CATransform3D trasform = CATransform3DScale(self.layer.transform, 1.15, 1.15, 1); trasform = CATransform3DRotate(trasform, angle, 0, 0, 0); CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"]; animation.toValue = [NSValue valueWithCATransform3D:trasform]; animation.autoreverses = YES; animation.duration = 0.3; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; animation.repeatCount = 2; [self.layer addAnimation:animation forKey:

How would you properly determine if a point is inside a rotated CGRect/frame? The frame is rotated with Core Graphics. So far I've found an algorithm that calculates if a point is inside a triangle, but that's not quite what I need. The frame being rotated is a regular UIView with a few subviews. Let's imagine that you use transform property to rotate a view: self.sampleView.transform = CGAffineTransformMakeRotation(M_PI_2 / 3.0); If you then have a gesture recognizer, for example, you can see if the user tapped in that location using locationInView with the rotated view, and it automatically

I'm having trouble drawing in the drawRect method of my custom UITableViewCell. Here is the code I am using - (void)drawRect:(CGRect)rect { CGContextRef ctx = UIGraphicsGetCurrentContext(); CGPoint origin = _faceView.frame.origin; CGFloat width = _faceView.frame.size.width; CGFloat height = _faceView.frame.size.height; CGFloat border = 2.0f; CGPoint startPt = CGPointMake(origin.x + width/2, self.frame.size.height); CGContextBeginPath(ctx); CGContextMoveToPoint(ctx, startPt.x, startPt.y); CGPoint basePt = CGPointMake(startPt.x, origin.y - height - border); CGContextAddLineToPoint(ctx, basePt.x,

I have not really done much programming with Core Graphics. And I tend to stick with QuartzCore now that it does a lot of what I need through the layer property :) However, I have a UIView, which is currently gradient. I'd like to add rounded corners to this UIView and the layer property does not do this when I draw the gradient: - (void)drawRect:(CGRect)rect { CGContextRef currentContext = UIGraphicsGetCurrentContext(); CGGradientRef glossGradient; CGColorSpaceRef rgbColorspace; size_t num_locations = 2; CGFloat locations[2] = { 0.0, 1.0 }; CGFloat components[8] = { 1.0, 1.0, 1.0, 0.95, //

When programmatically working with display modes in OS X ( documentation ), I've found that the CGDisplayCopyAllDisplayModes leaves out the rightmost option that is presented in System Preferences. A simple utility that prints the size of the current display mode and all available display mode sizes outputs this current size: 1920x1200 available sizes: 2880x1800 1440x900 2560x1600 2048x1280 1024x768 800x600 640x480 1680x1050 1280x800 1920x1200 is a valid option All of the other options that System Preferences gives are represented in the list. Does anyone have any idea why 1920x1200 may not be

I've got a UIView that is set to opaque = NO and it all works nicely. In the drawRect I'm doing custom drawing, and this works CGContextSetFillColor(context, CGColorGetComponents([UIColor blueColor].CGColor)); CGContextFillRect(context, labelOutside); CGContextAddRect(context, labelOutside); but this CGContextSetFillColor(context, CGColorGetComponents([UIColor whiteColor].CGColor)); CGContextFillRect(context, labelOutside); CGContextAddRect(context, labelOutside); results in NO fill being produced (you can even see other stuff that I drew on the CGContext through it). How can I draw a white

I am trying to change the corner radius of a button (OpenNoteVisible.layer) in the following way: CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"cornerRadius"]; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; animation.fromValue = [NSNumber numberWithFloat:10.0f]; animation.toValue = [NSNumber numberWithFloat:0.0f]; animation.duration = 1.0; [animation.layer setCornerRadius:140.0]; [OpenNoteVisible.layer addAnimation:animation forKey:@"cornerRadius"]; But this code gives an error at the line [animation.layer