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.
Questions tagged [quartz-graphics]
1214 questions
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iPhone Quartz - Call Drawing Method From Other Class
I'm trying to call a drawing method from Class A for example, the method located in Class B, the method is being called but no drawing happen.
- (void)drawIt
{
CGContextRef context = UIGraphicsGetCurrentContext();
…
jkigel
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1 answer
Get NSImage from CIFilter "CIRadialGradient"
I have to generate an image like the one in Apples Doc at CIRadialGradient found here:
I tried many ways and ended with:
+(NSImage*)radialGradientWithR0:(float)r0 r1:(float)r1 c0:(NSColor*)c0 c1:(NSColor*)c1 imageDimensionPx:(int)imageDimension
{
…
Felix
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- 5
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1 answer
Options to CGBitmapContext for Drawining
Is there an option to the CGBitmapContext or Quartz 2D?
I want to use it for drawing on an UIImage in monotouch.
thanks Alex.
Alex
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1 answer
Changing color space on and image
I'm creating a mask based on DeviceGray color space based image.
What basically I want to do is to change all sorts of gray (beside black) pixels into white and leave black pixels as they are.
So I want my image to be consisted with black and white…
deimus
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1 answer
Setting apple.awt.graphics.UseQuartz to false for applets with Apple's 1.5 update 4
Apple seems to have quart rendering on by default:
http://lists.apple.com/archives/Java-dev/2007/Jun/msg00066.html
However there are cases where this is attrociously slow. From a desktop app, I merely add:
-Dapple.awt.graphics.UseQuartz=false
This…
jsight
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1 answer
Draw chinese font glyphs with Quartz 2D?
I have to show Chinese characters with the function:
CG_EXTERN void CGContextShowGlyphsAtPoint(CGContextRef context, CGFloat x,
CGFloat y, const CGGlyph glyphs[], size_t count)
But it doesn't show accurately. The code I use is as follows:
CGFontRef…
Bunsman
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1 answer
Best way to do copy fitting in iOS?
Has anyone got a good copyfitting routine for iOS? I basically want to draw the largest text that will fit inside a rectangle. The previous way I did it in Carbon was to create the text at a huge font size, then keep reducing the size until the…
Owen Hartnett
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votes
1 answer
Quartz iPhone drawRect not called
I am subclassing a UIView and am calling it via a detail view controller. When I load it, it shows up with the right dimensions and positioning, however it is just a black square... When I just put a UIView into interface builder with the class,…
michaela
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clearContextBeforeDrawing in TouchEnd Method
I am using the pencil drawing simply. But i have to show it from rough drawing to Smooth drawing. So I am using the code differently in both touchesMoved and touchesEnded.
The codes are as follows:
-(void)touchesMoved:(NSSet *)touches…
Myaaoonn
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2 answers
EXC_BAD_ACCESS on animationForKey:
I'm trying to use a recent feature of the Scintilla component, which provides OSX-like text-highlighting effect (the yellow animated bouncing box), and I'm stuck with an error that pops up intermittently :
EXC_BAD_ACCESS
pointing to this…
Dr.Kameleon
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2 answers
Detecting what part of screen/application window is using OpenGL?
I am interested in identifying which part of application is making use of OpenGL.
Take an example of Chrome where Youtube video being played in Flash (get rendered via OpenGL). I am interested in detecting only the area of application where that…
RLT
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1 answer
Custom Animations with UIViewController
I'm using a custom animation to present my view controllers. Here's the code:
-(void)launchCustomModal:(id)sender
{
UIButton *buttonClicked = (UIButton *)sender;
int selection;
selection = buttonClicked.tag;
[ticker…
Sean Danzeiser
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6 answers
On iPhone, what is the best way to move a UIImageView with onscreen controls?
I am developing an iPhone version of this game. http://www.students.uni-mainz.de/rathb000/Fillit/Game.html
I am using an NSTimer to change the position of the ship by 1 pixel and the time interval for the timer is 0.002.
However, i have noticed…
Chintan Patel
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2 answers
Gradient Stroke on UIButton
I've found the GradientButton class for gradients on a UIButton - however I can't figure out how to get a matching stroke around the button. How do you create a gradient stroke on the button?
C.J.
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2 answers
Calling setNeedsDisplay on a UIView from another class
I have a UIView subclass that I manipulate a lot of graphics on based on touches. All the [self setNeedsDisplay] calls seem to be fine.
However, I used an instance variable pointer to my same UIView subclass instance, and then tried manipulating…
Craig
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