I have been doing some keyframe animations lately and figured it would make a good entry. Keyframe animations are cool because they give you more exact control over the way your layers animate. The basic animation does a linear interpolation between the 'start' value and the 'end' value. Which works great in many if not most cases but some times you want the path your animation follows to be some
Mike Lee, of Delicious Monster fame, has a thrown up a tantalizing post concerning Core Animation and lemurs. Being a member of the Founding Troop myself, and an avid lover of OpenGL and Core Animation, I just had to check it out. Mike offers up a fantastic way of leveraging Core Animation to almost perfectly capture the essence of the Dashboard-liquifying, delicious flips the iPhone pulls off. No
CoreAnimation Sample Code: ArtGallery 1.0.1 There have been improvements since the first version of ArtGallery. Most notably, there's an example of using a Core Image transition in CoreAnimation, as well as some sound effects. Clicking on an image causes a Mario64-esque ripple as the item transitions to black-and-white. There is also keyboard navigation now and the on-screen arrow controls have be
A Three-Pack of Core Animation Samples Lucas Newman has posted a collection of three Core Animation sample projects. These examples stand out not only because they actually do interesting things, but the code is well-written and well commented. The three samples are: 1. Wallball — a 3D pong-like game where you bounce the the ball against a backboard which stretches and distorts as the ball makes c
Both Lucas and I have some projects that we demoed which aren't available for download right now. For me, it's because there's a difference between code that's ready to demo, and code that's ready to distribute. I think you guys and gals would probably like everything that was demoed, so we'll see if we can make that happen. If you like a lot of pixels, Stephen Zyszkiewicz uploaded the talk in HD
If you've ever tried Core Image's compositing filters, you've seen the BIG gotcha : the images are composited one of top of each other and you can't change their position. That means they're stuck at the same position, both cramped at (0, 0) — not very useful unless you're blending same size images. To position two images where you want them and have the top one composited on top of the other one,
Have you ever seen ghosting when creating layers and animating them to a new position ? I have, and I've been puzzled. In CocoaNav, the frameworks gradually move to the back, and once they're loaded they all move up front on the same plane. Once I messed up so bad to actually see Core Animation fading between the two positions ! Animating squares, this looks like that : You're expecting layers to
Update: this is indeed a dodgy method I’ve posted below. I’ll update this post when I can, but you’re better off digging out your 8th grade maths and working out the coordinates of surrounding cells and constraining all edges to each other. Friends don’t let friends blog at 12.30am. So I’ve been puzzling for a few weeks through the dim and darkened alleyways of Leopard’s new Core Animation APIs an
Here's a little Core Animation sample with 3d layers. It looks better when moving ! :) After learning that core animation doesn't like a root layer with a perspective transform, this sample sets up the perspective transform on a container layer, and stores the CATextLayer layers there. Works pretty well this time ! This uses preferredFrameSize to set the CATextLayer bounds, animates zPosition with
While playing around with Scott Stevenson's NanoLife, I've wondered 'How would it look in 3d' ? Unfortunately, it looks … pretty bad. Once you setup a projection matrix and give your layers a z position, Core Animation handles your layers as 3D objects. The problem here is culling : deciding which layers are visible on screen. In 2D the problem is trivial : just check the x,y position of the layer
Core Animation is really the buzz among Cocoa developers these days and we are no different from the rest. Learning to do simple fades and frame movement is trivial, but figuring out the more complex effects is quite a challenge. We decided to venture out and try to create some really concise examples of effects you might find used in Leopard. And while these effects may not be done with Core Anim
Arguably the most important change in Leopard was not a user feature, but a developer one: Core Animation. Over the coming years, the way applications look and react to user interaction will change dramatically, and that will be largely due to the ease with which interfaces can be animated with Core Animation. Sure, there will also be overt eye candy, but there will also be lots of more subtle cha
In my previous post I published some sample code on how to use a mask on a core animation layer. Here is a practical example of a mask, creating a scroll control almost identical to the one displayed in iTunes. When developing SunFlower 0.8 I changed one of the custom views to use core animation. Faced with the choice to either hook up the new view to a standard cocoa scrollbar or create a custom
All Cocoa in one glimpse→ CocoaNav reads frameworks right from /System/Library/Frameworks and displays them with their objects and methods. All your Cocoa too !→ CocoaNav can display the Cocoa class tree : add your frameworks and projects and you'll see where your classes fit in. Framework view View all frameworks and their classes neatly arranged inside them. Crumb View Which class does it derive
Apple defines Core Animation as: A framework that makes it simple for Mac developers to add visually stunning user interfaces, graphics, and animations to applications. Without any advanced graphics techniques, you can create fluid, stutter-free effects and experiences as groundbreaking as Time Machine and the new Dock. Core Animation allows any developer to add animation, simple or complex, to hi
Author: Drew McCormack Web Site: www.maccoremac.com In the first part of this foray into Core Animation, we saw how you can animate the properties of a plain square layer, translating, scaling, and rotating in time. In this part, you’ll learn how to build up hierarchies of layers — the proverbial fleas on the fleas. To do this, we’ll finish off the Flea on Flea application, adding sublayers that
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