quartz-graphics

I am trying to implement a 3D Carousel on the iPad, consisting of UIViews, an effect like what is shown over here . I have gone through many similar questions on SO, but didn't find any staisfactory answers or no answers at all. I am trying to achieve the effect through modifying the coverflow animation but it just doesn't give that slick effect. Has anyone implemented this?(open for suggestions through quartz and openGL both) No need to dive into Quartz or OpenGL, assuming you don't mind foregoing the blur. The page you link to gets the perspective wrong (that's why the images in the

I have a reasonably complex hierarchy of UIImageView s. Originally, I was carefully swapping the sibling order when one UIImageView moved in front of another. Then I found out about myUIImageView.layer.zPosition and switched to using this instead. Worked out much simpler. It even works almost all the time. I found out from this SO question that zPosition only works amongst sibling layers. Great! So I have two questions really: Is there any actual documentation about this? and, is there some kind of fudge I can use to get this to work? (like adding all my UIImageViews to a UIView that is never

Here is the code I use to draw: - (void) drawSomething { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetRGBStrokeColor(context, 1, 0, 0, 1); CGContextSetLineWidth(context, 6.0); CGContextMoveToPoint(context, 100.0f, 100.0f); CGContextAddLineToPoint(context, 200.0f, 200.0f); CGContextStrokePath(context); NSLog(@"draw"); } But I got the error like this: [Session started at 2010-04-03 17:51:07 +0800.] Sat Apr 3 17:51:09 MacBook.local MyApp[12869] <Error>: CGContextSetRGBStrokeColor: invalid context Sat Apr 3 17:51:09 MacBook.local MyApp[12869] <Error>: CGContextSetLineWidth:

I try to get the screenshot from all monitors connected with my MAC to one picture. I know, how I can do this if every monitor's screenshot will saved to different pictures, but it is not what I want. I found function CGGetDisplaysWithRect , but my solution don't work, because output picture is empty. I expect, that problem with function CGDisplayCreateImageForRect (*displays, rect), because first parameter must be CGDirectDisplayID type, but not CGDirectDisplayID*. But I can't find function, which can create one picture with some CGDirectDisplayID objects. Help me please!!! #include <stdio.h>

No doubt this might be a duplicate question but I am not able to get proper solution from any post here. So I am posting this as new post with a hope that I get some solution. I my drawing app I want to give a feature of opacity for lines to be drawn. But when I assign alpha to color, I am getting overlapped points in between the line. Some where I found that drawing in two views solves this issue, but I was not able to understand the logic behind that. I am using normal quartz 2d code to draw line on touch events. Kris Van Bael Duplicate of In CoreGraphics drawing how can I keep the point of