CODEWITHSUNDEEP
iosobjective-crotationscalecgaffinetransform
Dummy Code
Dummy Code

Reputation: 1898

CGAffineTransformMakeRotation and CGAffineTransformMakeScale

How come only one of the above works in code?

Currently I am using the following...

image.transform = CGAffineTransformMakeRotation(M_PI/2.5);
image.transform = CGAffineTransformMakeScale(1.25, 1.25);

And my image is scaled to 125% like the second line says, however it is not rotate at all.

When I flip the code around to say...

image.transform = CGAffineTransformMakeScale(1.25, 1.25);
image.transform = CGAffineTransformMakeRotation(M_PI/2.5);

My image is rotated but not scaled...

Is there a way to use both of these in the same code?

I have these in my viewDidLoad method. Can anyone help me?

Thanks!

Upvotes: 2

Views: 4039

Answers (2)

Rob
Rob

Reputation: 437552

The second one should not use the Make rendition of the function. Thus you should, for example either:

CGAffineTransform transform = CGAffineTransformMakeScale(1.25, 1.25);
image.transform = CGAffineTransformRotate(transform, M_PI/2.5);

or

CGAffineTransform transform = CGAffineTransformMakeRotation(M_PI/2.5);
image.transform = CGAffineTransformScale(transform, 1.25, 1.25);

Contrast the Creating an Affine Transformation Matrix functions with the Modifying Affine Transformations functions.

Upvotes: 6

Andrea
Andrea

Reputation: 26385

CGAffineTransformMake are applied to the identity matrix, so you are rotating, but then is like you restore the identity and apply the scale. Use CGAffineTransformMake.. only for the first, for the second use CGAffineTransform...

Upvotes: 0

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