I've masked out my image thusly: CGImageRef maskRef = [[UIImage imageNamed:@"testMask2.png"] CGImage]; CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef), CGImageGetHeight(maskRef), CGImageGetBitsPerComponent(maskRef), ...
Hello folks, I'm writing some lines of code to get acquainted with the basics of Quartz 2d. I am trying to draw and image an then clear it through the kCGBlendModeClear blend mode. Here's the code of my UIView subclass code, whose background color is set to orange through IB: - (void)drawRect:(CGRect)rect { UIImage *brush = [UIImag...
I'm doing some graphics processing and I have a logic where in I have a bitmap with edges and I disregard all table edges from the letters E.g. 0000000000 0111111110 0100000010 0102220010 0100200010 0100200010 0100000010 0111111110 0000000000 0 - background color 1 - ignored edges 2 - edges I need My logic is just simple, if a number...
Does anyone know what the limitations are on image size with custom CIFilters? I've created a filter that performs as expected when the images are up to 2 mega pixels but then produce very strange results when the images are larger. I've tested this both in my cocoa app as well as in quartz composer. The filter I've developed is a geomet...
An iPhone app which I am creating generates reports from a Core Data database as a CSV file, which can then be emailed so that the user may use that data elsewhere outside of the app. I would also like to offer the ability to generate the same reports as a PDF file (of course, with nicer formatting) allowing the user to immediately print...
I have a Quartz 2D game which draws directly onto a context. For this reason I am having to adapt the code so that it scales if appropriate for a Retina display. I am doing this using the following code: - (CGFloat) displayScale { if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) { return [[UIScreen mainScreen]scale]...
I want to temporarily distort the area under the mouse using a CIBumpDistortion to increase the visibility of the mouse pointer. At the moment, I have a transparent-background NSWindow that floats around under the pointer and shows a cross-hair that fades in when you move the mouse, and out when you stop. This is working okay, but a Bu...
Hi, I'm trying to use CAGradientLayer and getting an unhelpful compile error. Can't figure out whats wrong. All I'm doing so far is: CAGradientLayer *gradient = [CAGradientLayer layer]; I've imported <QuartzCore/QuartzCore.h> and I'm getting the warning > _OBJC_CLASS_$CAGradientLayer referenced from: objc-class-ref-to-CAGradientL...
Hey guys, I want to draw an image using an additive blend mode. But I don't want to use OpenGL. I can't find anything to do this, maybe there's something in Quartz2D? Can anyone point me in the right direction? Cheers, Rich ...
I currently have 3 simple UIImageViews that animate across a UIView in my app. The animations work fine in the simulator. However, when I test the app on the device, all I see is a blank UIView. Are there any special libraries/header files I need to import to fix the problem of animation not appearing on the device? ...
Hi, I am having trouble drawing one pixel wide lines. All lines are perfectly horizontal or vertical (I am not drawing diagonal lines) but they do not draw cleanly. It looks like it is drawing across two pixels at a reduced alpha. No doubt due to antialiasing. I've searched the docs and forums and have come across a statement saying that...
I am at my wits end trying to come up with a design pattern for this paradigm. I haven't had much luck on this site but at this stage I'll try anything. I am trying to implement a radar type animation and hence I am rotating a view 360 degrees to represent the radius rotating around the circle. I have placed points around this circle an...
Hi, I'd like to have a water effect on a background layer in my app. The effect doesn't need to react to touch or anything - it just needs to wave an image a little bit. CCWaves3D seem ok, but leave have nasty black artifacts around the edges when I run it. Similarly CCShaky3D. CCLiquid brings my app down from 20fps to 5fps.. Is there ...
Hello! I have a transparent image that I draw strokes into and later on I draw this image over a textured background using CGContextDrawImage. The problem is that even the parts that have been stroked by a pure black color ([UIColor blackColor]) come out as slightly transparent on the textured background. The stroke looks like this: CG...
I have objects containing Quartz-2D references (describing colors, fill patterns, gradients and shadows) in Cocoa. I would like to implement the NSCoding protocol in my objects and thus need to serialize those opaque Quartz-2D structures. Possible solutions might be: Define a set of properties in my objects that allow to setup the dat...
Hi there, simple question, I've got a superview holding multiple sub UIIMageViews that I'd like to move simultaneously. I now about UIIView Animations but not how to launch multiples animation at a time. Any clue about that ? example animations would be : growing, shrinking, alpha changes, moving along different (radom generated) pat...
I have used CGContextDrawPDFPage two times in my project. One is for displaying the PDF and the other is for making the thumb image of the PDF. I am using the PDF to image code from http://github.com/0xced/pdfrasterize/blob/master/CGPDFAdditions.c I am calling the PDF to image method like this in my code NSURL *url = [NSURL fileURLW...
I (think) have every values for Text-Rendering in a PDF. * Position (Text Matrix) * FontDescriptor with Widths Array * FontBBox * StemV/StemH * FontName * Descent * Ascent * CapHeight * XHeight * ItalicAngle My problem is I don't know what to do with these values. I went through the PDF Spec 1.7 a couple of times and cannot find a for...
Hi, I would like to implement a drawing class with the help of Quartz. I want to be able to save parts of what is drawn on separate layers. I want these layers to be retrievable, so I can delete/hide/show layers on command. Can I save multiple CGLayerRef as a NSMutableArray property of my class and then be able to retrieve them? If yes...