CODEWITHSUNDEEP
iosobjective-ccore-animation
NOrder
NOrder

Reputation: 2493

how does CATransform3DTranslate do translate?

I know that the CATransform3D is defined as 

struct CATransform3D
{
CGFloat m11, m12, m13, m14;

CGFloat m21, m22, m23, m24;

CGFloat m31, m32, m33, m34;

CGFloat m41, m42, m43, m44;
};

and the Apple document says that

CATransform3DTranslate
Translate 't' by '(tx, ty, tz)' and return the result: t' = translate(tx, ty, tz) * t.

I want to implement my CATransform3DTranslate method, but I don't know exactly how to calculate the t', i.e. I have the transform like self.layer.transform, and tx = 10, ty=tz=0, how to calculate get the t'?

Upvotes: 1

Views: 2516

Answers (1)

Giuseppe Lanza
Giuseppe Lanza

Reputation: 3699

You don't have to. You just use CATransform3dMakeTranslation method on a layer, you set the input values and game! CATransform3dMakeTranslation (like CATransform3DMakeRotation) will do all the math tho have a rototranslation matrix of coordinate change. You don't have to worry about the matrix itself if all you want is to translate/rotate/rototranslate a layer in the 3d space.

Upvotes: 4

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