Hello, I have two uiimageview, i need to have the imageview transparent under the touch point..(with a circle)...to be able to see the image under the first one.. Can you share me some code or examples? Thanks! ...
I'm programming an app in which one of the ViewControllers is showing an UIScrollView that shows an image. I'd like to load an image (pushpin in png format) and draw it (and delete it) in some points of the UIScrollView image. I'd also would like to draw bezier paths in that image (and deleting them). I've programmed several apps but...
I am trying to manipulate an image using a chain of CIFilters, and then examine each byte of the resulting image (bitmap). Long term, I do not need to display the resulting image (bitmap) -- I just need to "analyze" it in memory. But near-term I am displaying it on screen, to help with debugging. I have some "bitmap examination" cod...
I have a CGBitmapContext (bitmapContext) and I would like to draw some rectangle part (rect) of it to the current CGContext (context). Right now I do that way: CGContextRef context = UIGraphicsGetCurrentContext(); CGImageRef cgImage = CGBitmapContextCreateImage(bitmapContext); CGContextClipToRect(context, rect); CGContextDrawImage(cont...
Hi, I have a view that I want to extend on the left side using an animation. All borders but the left one should remain the same, so the x position and the width of the view are changing. I use this code: [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:5.0]; self.frame = CGRectMake(self.frame.origin.x-100, ...
In the Resource Programming Guide it gives 2 methods to load image resources, using Quartz & C vs ObjectiveC . Can anyone tell me what the difference is? Are both identical in terms of performance with a large number of images? ...
Hi, I'm trying to work out what the best way to draw over the top of all other items on the screen on OS X. I don't want to impede the user's ability to interact with their applications, but want to 'annotate' them. I want to be able to draw up to 20 different annotations. The top half of this screenshot from Gizmodo happens to nicely s...
At a high level (or low level if you'd like), what's a good way to implement a smudge affect for a drawing program on the iPad using Quartz2D (Core Graphics)? Has anyone tried this? Thanks so much in advance for your wisdom! UPDATE I found this great article for those interested, check it! ...
I'm having crashing issues using the Quartz PDF API for iOS. At the moment I am compiling with the SDK 4.0 GM Seed and running on my 3.2 iPad (I have tried using the 3.2 SDK with identical results). All the code I am using is based on the standard Apple Quartz documentation and from various sources around the internets. So I can't image...
I'm trying to find the best approach to build a music visualizer to run in a browser over the web. Unity3D is an option, but I'll need to build a custom audio import/analysis plugin to get the end user's sound output. Quartz does what I need but only runs on Mac/Safari. WebGL seems not ready. Raphael is mainly 2D, and there's still the i...
So here is my Objective : Suppose I have a photo of my house... I want to create a wall or fence out side my house on my garden... but i want to see how it looks before creating it. So 1> User selects type of structure (wall, fence, sideways, etc etc ) 2> User selects Texture type/Color etc 3> User choose the Path Or area 4> user ...
I'd like to create a fade out affect with one of my bitmap contexts that I use to draw a static image in one of my views. What's an easy way to adjust the overall opacity of the bitmap context on the fly before I render it to the view? Thanks so much in advance for your help! I'm going to continue researching this right now. ...
This question is similar to another question I just posted, but I'd also like to create a fade out affect with one of my CGImageRefs that I use to draw a static image in one of my bitmap contexts using CGContextDrawImage(mBitmapContext, imageRect, imageRef). What's an easy way to adjust the overall opacity of CGImageRef on the fly before...
Or I should ask why is it so difficult for me? The answer is probably that I'm new to iPhone development and I'm trying to ditch my old methods and step into the new platform of the future. From start to finish, I have a few questions about this process... If I create a .png image, where does it go in my project's directory (i.e. my ...
Hello guys! Here's my code for getting the pages from a pdf document and create a pdf document with each page: - (void)getPages { NSString *pathToPdfDoc = [[NSBundle mainBundle] pathForResource:@"security" ofType:@"pdf"]; NSURL *pdfUrl = [NSURL fileURLWithPath:pathToPdfDoc]; CGPDFDocumentRef document = CGPDFDocumentCreateWithURL((CFUR...
I'm having some performance issues calling CGContextDrawLayerAtPoint in iOS 4 that didn't seem to exist in previous version of the OS. I'm copying a layer obtained from a bitmap context created with CGBitmapContextCreate to my view's context during a drawRect call. The view and the bitmap are the same size. The bitmap was created with...
Hello guys! Here's my code to create a PDF file from a CGPDFPageRef. + (void)createPDFFromPDFPage:(CGPDFPageRef)page withFilename:(NSString *)filename { CGRect pageRect = CGPDFPageGetBoxRect(page, kCGPDFMediaBox); CFStringRef path = CFStringCreateWithCString (NULL, [filename UTF8String], kCFStringEncodingUTF8); CFURLRef ur...
CGAffineTransformMakeRotation(90); How can I send mytextfield.text to CGAffineTransformMakeRotation like : CGAffineTransformMakeRotation(mytextfield.text); ...
I have in front of me two Quartz iPhone apps. In each of them, calls to setNeedsDisplay cause a view to redraw itself. But there is an important difference. In one case (the "Quartz Fun" app from the Mark/Lamarche book "Beginning iPhone development"), the view starts out blank each time. In the other case (the app I am working on), t...
Hello friend, I am trying to read a PDF on iPhone, I got to know that we can get the info about PDF from CGPDFDocumentGetCatalog method. But, this method returns a CGPDFDictionaryRef. I have browsed through the documentation and didn't find any method to extract its Key/Values. Please help me if anybody has solution for the problem. Or ...