Is there any `android graphics Camera` equivalent for 3D ope

Question

Is there any `android graphics Camera` equivalent for 3D operations so we can perform code like this ```val matrix = android graphics Matrix we have androidx compose ui graphics Matrix val camera = Camera drawScope drawIntoCanvas canvas gt camera transformations like camera rotateZ etc camera getMatrix matrix matrix preTranslate x y matrix postTranslate x y canvas save canvas nativeCanvas concat matrix drawScope draw canvas restore ``` Thanks

Michael Paus · Answer

Can t you directly use the transform operations provided by the draw scope or the canvas Why do you need a camera for that

Guilherme Delgado · Answer

Because in Android we use the Camera for 3D x y z operations with drawScope Canvas I only have 2D x y

Michael Paus · Answer

But in your example code above you are not using any 3D transforms According to my understanding the Camera class is just a helper class to extract the 2D part from a 3D transform I haven t tried it but I assume that the Camera class source code could be easily adapted to Compose

Guilherme Delgado · Answer

I didn t put a complete example only ` camera transformations like camera rotateZ etc `

Guilherme Delgado · Answer

On Android that s how I ve created <https github com GuilhE KitchenTimer|this> but I m struggling to find similar in Compose Desktop

Michael Paus · Answer

As I said the Camera class does not seem to be readily available in Compose desktop but you might want to have a look at the original Android code Edit The Android Camera class seems to be backed by some native code and thus cannot be adapted

Michael Paus · Answer

On a closer look I think much of what you can do with the Camera in Android can already be done with the Compose Matrix class directly <https developer android com reference kotlin androidx compose ui graphics Matrix>

Guilherme Delgado · Answer

Thanks gonna have a look +1

Guilherme Delgado · Answer

example ```val matrix = Matrix matrix rotateX 45f matrix rotateY 45f matrix rotateZ 45f drawContext canvas save drawContext canvas concat matrix draw drawContext canvas restore ``` Seems to work slightly smiling face

Michael Paus · Answer

Nice and that code will work on Android AND Desktop

Michael Paus · Answer

This code could be further improved by using something like this ```drawScope withTransform transform matrix ``` This should avoid all these concat save restore