FireworkParticlesGeometryEffect.swift

struct FireworkParticlesGeometryEffect : GeometryEffect {
    var time : Double
    var speed = Double.random(in: 20 ... 200)
    var direction = Double.random(in: -Double.pi ...  Double.pi)
    
    var animatableData: Double {
        get { time }
        set { time = newValue }
    }
    func effectValue(size: CGSize) -> ProjectionTransform {
        let xTranslation = speed * cos(direction) * time
        let yTranslation = speed * sin(direction) * time
        let affineTranslation =  CGAffineTransform(translationX: xTranslation, y: yTranslation)
        return ProjectionTransform(affineTranslation)
    }
}

Hi,
Thank you for sharing your code. I keep getting this error for line 13:
"Type of expression is ambiguous without more context"

Do you know why? Your help would be much appreciated.

I think the CGAffineTransform want CGFloat arguments, but the compiler is providing Double. Try this:

    let xTranslation = CGFloat(speed * cos(direction) * time)
    let yTranslation = CGFloat(speed * sin(direction) * time)