quartz-graphics – Page 2

How to animate layer shadowOpacity?

May 14, 2023 by Tarik

This will work properly: #import <QuartzCore/CAAnimation.h> CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@”shadowOpacity”]; anim.fromValue = [NSNumber numberWithFloat:1.0]; anim.toValue = [NSNumber numberWithFloat:0.0]; anim.duration = 1.0; [vv.layer addAnimation:anim forKey:@”shadowOpacity”]; vv.layer.shadowOpacity = 0.0; For Swift 3.0: let animation = CABasicAnimation(keyPath: “shadowOpacity”) animation.fromValue = layer.shadowOpacity animation.toValue = 0.0 animation.duration = 1.0 view.layer.add(animation, forKey: animation.keyPath) view.layer.shadowOpacity = 0.0

Weak performance of CGEventPost under GPU load

April 25, 2023 by Tarik

I guess you’re filling up the queue (underlying mach port)… You can confirm this using the “scheduling” or “system call” instrument in Instruments. (Create a new blank document, add the instrument, then under File > Record Options… make sure “deferred mode” is checked.) This will show all thread activity in your app (when threads block, … Read more

How do I create a CGRect from a CGPoint and CGSize?

April 22, 2023 by Tarik

Two different options for Objective-C: CGRect aRect = CGRectMake(aPoint.x, aPoint.y, aSize.width, aSize.height); CGRect aRect = { aPoint, aSize }; Swift 3: let aRect = CGRect(origin: aPoint, size: aSize)

Get PDF hyperlinks on iOS with Quartz

April 17, 2023 by Tarik

heres the basic idea to get to the annots CGPDFDictionary for each page atleast. after that you should be able to figure it out with help from the PDF spec from Adobe. 1.) get the CGPDFDocumentRef. 2.) get each page. 3.) on each page, use CGPDFDictionaryGetArray(pageDictionary, “Annots”, &outputArray) where pageDictionary is the CGPDFDictionary representing the … Read more

Curve text on existing circle

April 16, 2023 by Tarik

I adapted Apple’s CoreTextArcCocoa sample project (mentioned by Tom H in this reply) and thought I’d share it here. I added a few other features as well, such as the ability to set the arc size to something smaller than 180, and the text color and offset shift as properties (so that you don’t have … Read more

iPhone smooth sketch drawing algorithm

March 13, 2023 by Tarik

CGPoint midPoint(CGPoint p1, CGPoint p2) { return CGPointMake((p1.x + p2.x) * 0.5, (p1.y + p2.y) * 0.5); } -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; previousPoint1 = [touch previousLocationInView:self]; previousPoint2 = [touch previousLocationInView:self]; currentPoint = [touch locationInView:self]; } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; previousPoint2 = previousPoint1; previousPoint1 … Read more

How to draw a rounded rectangle in Core Graphics / Quartz 2D?

March 6, 2023 by Tarik

Instead of making your own path out of lines and arcs, you can use [UIBezierPath bezierPathWithRoundedRect:cornerRadius:] or [UIBezierPath bezierPathWithRoundedRect:byRoundingCorners:cornerRadii:] (the second one lets you specify which corners are rounded) Available in iOS 3.2 or later.

Detecting CGAssociateMouseAndMouseCursorPosition

March 6, 2023 by Tarik

I dont know if this can help you There is an option called Focus Follows Mouse Focus Follows Mouse – The Mouse pointer will grab automatically change focus to a new window inisde this one app if you mouse over it, instead of having to click a window to get focus, then clicking to do … Read more

NSAttributedString background color and rounded corners

February 16, 2023 by Tarik

TL;DR; Create a custom-view, which renders same old NSAttributedString, but with rounded-corners. Unlike Android’s SpannableString, iOS does not support “custom-render for custom-string-attributes”, at least not without an entire custom-view (at time of writing, 2022). I managed to achieve the above effect, so thought I’d post an answer for the same. If anyone has any suggestions … Read more

What’s the difference between Quartz Core, Core Graphics and Quartz 2D?

February 10, 2023 by Tarik

Quartz 2D is an API of the Core Graphics framework that implements drawing. Quartz Core is a framework that includes APIs for animation and image processing. Quartz frameworks and their APIs CoreGraphics.framework Quartz 2D API manages the graphic context and implements drawing. Quartz Services API provides low level access to the window server. This includes … Read more