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Questions tagged [quartz-graphics]

Quartz is graphic framework used on Mac OS X. It forms a graphic layer. Term Quartz is used to represent Quartz 2D and Quartz Compositor. Quartz graphic is a 2D renderer in Core Graphics.

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Image is rotated after process. How can i do this correctly?

My problem is: UIImage is rotated after processing. I use a helper class for the image processing called ProcessHelper. This class has two methods: + (unsigned char *) convertUIImageToBitmapRGBA8:(UIImage *) image; + (UIImage *)…
Tomasz Szulc
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change uiview frame from both sides

Hello i want to make animation of a frame change. But i don't find nothing similar on the internet. I know how to animate the frame change, but the tricky part is that for example i have a square and i want it to shrink to the center. So how do i…
Lukas
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CGContextFillRect not working

This code appears to do nothing. Build successful, no errors. No rectangle drawn on screen. - (void)viewDidLoad { [super viewDidLoad]; UIColor *reliantMagenta = [UIColor colorWithRed:208.0f / 255.0f green:27.0f / 255.0f…
Fresheyeball
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iOS - scaling text vertically on Quartz

I am writing some text to a quartz context. I have a box of 500 x 200 pixels and I am writing some text inside. The box can have any aspect ratio but the text will always write with the font proportions as it is. What I want is to scale the font…
Duck
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Creating a simple, single-view Quartz app

I'm an Objective-C newbie. Most of my experience is in Java. Also, I've never really used Xcode before and so I'm pretty new at that as well. I'm trying to create a simple, single-view Quartz OS X app (not iOS) to display agent-modeling simulations.…
Vivin Paliath
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Simple graph draw task for iPhone

I need to draw a simple graph, but I have no experience with custom draw iPhone graphics yet, so I hope, somebody can help me. Task is simple: I need to draw graph background from .png file from resource, and draw points, also from bundled…
Andrey
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Background in an iPhone Quartz CAAnimation

Whenever I am using a quartz animation the background of the animation is white. How can I change this to be a different color. This is the code I am using to produce the animation [UIView beginAnimations:nil context:nil]; [UIView…
DHamrick
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How to implement: UIViewContentMode ... Repeat?

UIViewContentMode covers a couple of positions you frequently need (Center, ScaleToFill, ScaleToFit), and a load that I suspect most people rarely use (TopRight, anyone?) But it appears to be missing an obvious one: "Repeat". Is there a way to…
Adam
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How can I refresh core plot without returning from a method?

I have a cocoa interface that uses core plot. When I press a button in the interface, a plot is drawn. I wanted to create a sequence of graphs by calling the plotting method multiple times along with calls to sleep() in between. But it seems that…
yan bellavance
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Draw multiple UIView objects dynamically on the current UIView

I'm trying to make my main ViewController with a custom view draw multiple custom UIView's to the main view, but somehow they are not drawing, I'm trying to draw dots. My code is: - (void)viewDidLoad { [super viewDidLoad]; // Do any…
perrohunter
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UIimageView rounded top corner BezierPath not working?

I'm try to round the top two corner of a uiimageview but the following code doesn't show rounded corner only the normal image. Am I missing something? Thx UIImageView * imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320,…
Nicolas Manzini
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CATransition animation key always "transition"

Got a basic CATranisition. Works. animationKey = @"fadeIn"; [self.icon setImage:self.iconSelected]; [self.shadow setAlpha:1.0]; CATransition *transitionIn = [CATransition animation]; …
Will Larche
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Rotate a UIImageView around a point off screen? (center of uiImageView

Hi I have a UIImageView which is part on, part off screen. I want to rotate the view around a point off screen (the center of the view.) How do I do this? fullRotationAnimation = [CABasicAnimation…
dev6546
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How to write sketch app on iOS

I'm trying to create sketch app that can draw shapes/path by finger. What I've done so far is create UIBezierPath when touch start, and draw the path while finger moves. -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch…
Kazuhito Ochiai
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CGLayer appearing the wrong way around

I've got a UIView subclass (TraceView) which is 200 wide by 100 tall, and I'm attempting to draw on it pixel by pixel. In this case, I'm trying to draw a horizontal blue line that goes 75% of the way across. Instead, I get two vertical blue lines…
Curyous
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