```val xOffset by infiniteTransition.animateFloat(...

# compose

[ursus]

val xOffset by infiniteTransition.animateFloat(
    ...
    animationSpec = infiniteRepeatable(
        animation = tween(durationMillis = 1500, easing = LinearEasing),
        repeatMode = RepeatMode.Restart
    )
)

val brush = Brush.linearGradient( <--------
    colors = ...,
    start = Offset(xOffset, 0f),
    end = Offset(xOffset + widthPx, 0f)
)

I have a infinite transition animation thats needs to animate gradient.

Is there a way to not allocate Brush instance every frame?

[romainguy]

There isn't but you could cache them and reuse them if your animation repeats.

[romainguy]

But first you should check it's an actual issue

[ursus]

I don't think it is an issue, its just my reflex to not allocate during animations

it does repeat but how would I cache it though? is float a good cache key?

[romainguy]

Float is not a good cache key, you'd have to round to ints. But again, I wouldn't bother in this case

[romainguy]

One thing you can do too is use ShaderBrush.transform to apply a scale to your gradient instead

[romainguy]

In your case you'd declare the gradient brush to be between 0 and 1 for instance, and apply a transform Matrix to translate it by xOffset and scale by widthPx

[romainguy]

https://developer.android.com/reference/kotlin/androidx/compose/ui/graphics/ShaderBrush#transform()

[romainguy]

This only works when you can apply a linear transform (so if you change the colors for instance, it won't help you)

[ursus]

interesting, will try! thanks