iOS Quartz 2D: draw an image simulating y axis rotation?

Question

I want to do this: draw an image using Quartz 2D, the image look like rotated according to its y axis in a 3D space, like this:

Is Quartz 2D capable to do this?

Answer 1

No, you cannot do this directly with Quartz 2D. It supports only affine transformations, which always preserve parallel lines.

(It's clear that you want the parallel lines on the top and bottom edges of your figure to become non-parallel.)

The term you're looking for is "perspective transformation", if you want to search for other ways to achieve this result.

Answer 2

I don't know how to do it in 2d, but its really easy to do it with quartz using this kind of call:

yourView.layer.transform = CATransform3DMakeRotation(M_PI/4, 0.0, 0.0, 1.0);

You should look into using the CATransform3D's. They are pretty powerful and easy to call.