quartz-graphics

I have the following code to make the UIImageView in each of my UITableView's cells have rounded corners: - (void)awakeFromNib { // Rounded corners. [[cellImage layer] setCornerRadius:([cellImage frame].size.height / 2)]; [[cellImage layer] setMasksToBounds:YES]; [[cellImage layer] setBorderColor:[[UIColor whiteColor] CGColor]]; [[cellImage layer] setBorderWidth:3]; // Trouble! } I want the images to have a bit of a gap between them, and figured I could make use of the border width to make that happen. Below is an image of what actually happened: It's that faint black border that I want to

I have an UIButton which is a logo. This logo button will glow on forever but will stop glowing on touch.It is like a glowing animation. Is there any suggestions? Undefined symbols for architecture i386: "_OBJC_CLASS_$_CABasicAnimation", referenced from: objc-class-ref in UIView+Glow.o "_OBJC_CLASS_$_CAMediaTimingFunction", referenced from: objc-class-ref in UIView+Glow.o "_kCAMediaTimingFunctionEaseInEaseOut", referenced from: -[UIView(Glow) startGlowing] in UIView+Glow.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see

I'm searching for some great Quartz 2D drawing tutorials aimed at the iPhone. I'm new to Quartz and want to start off with something easy and then progress to more difficult stuff. Does anyone know of any Quartz 2D drawing tutorials that they would recommend? Brad Larson I devoted an entire class to Quartz 2D drawing last semester in my advanced iPhone development course. The video for that is available on iTunes U , along with the rest of the class. The course notes for that session can be found here , and I created a sample application to show off some more advanced Quartz drawing concepts.

I am drawing a circle in the -drawRect: method of my UIView using the standard CGContextFillEllipseInRect() code. However, I would like to slightly pulse (make larger and smaller) and change the intensity of the color fill with an animation. For example, if the circle is filled with red I would like to pulse the circle and make the red slightly lighter and darker in-time with the pulsing action. Not having much experience with Core Animation I am a bit lost about how to do this, so any help would be greatly appreciated. This is much simpler if you don't draw the circle in drawRect: . Instead,

Has anyone experienced this problem? It looks like a bug in Apple's code and I will submit a radar if people agree that this code should do what I think it should do. I'm not all that familiar with CoreGraphics color management, hence I'm asking before I bug Apple with a bug report. This is straight out of a template project and the only non-template code is what you see below. Note that the red, green, and blue colors all show the correct component values but not white or black. The problem persists if you change the order with, say, black and white first, then red, green, blue. This is Swift

I am using the following pseudocode to generate a PDF document: CGContextRef context = CGPDFContextCreateWithURL(url, &rect, NULL); for (int i = 1; i <= N; i++) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; CGContextBeginPage(context, &mediaBox); // drawing code CGContextEndPage(context); [pool release]; } CGContextRelease(context); It works very well with small documents ( N < 100 pages), but it uses too much memory and crashes if the document has more than about 400 pages (it received two memory warnings before crashing.) I have made sure there were no leaks using Instruments

I have a task - draw smooth curve input: set of points (they added in realtime) current solution: I use each 4 points to draw qubic Bezier curve (1 - strart, 2 and 3rd - control points, 4- end). End point of each curve is start point for the next one. problem: at the curves connection I often have "fracture" (angle) Can you tell me, how to connect my points more smooth? Thanks! Lukas Šalkauskas Here is few references which can help you: Draw a Smooth Curve through a Set of 2D Points with Bezier Primitives Curve fitting Line Smoothing and point-weeding 来源： https://stackoverflow.com/questions