Fireworks.swift

//
// Fireworks.swift
// Vortex
// https://www.github.com/twostraws/Vortex
// See LICENSE for license information.
//

import SwiftUI

extension VortexSystem {
    /// A built-in fireworks effect, using secondary systems that create sparkles and explosions.
    /// Relies on a "circle" tag being present, which should be set to use
    /// `.blendMode(.plusLighter)`.
    public static let fireworks = VortexSystem(.fireworks)
}
extension VortexSystem.Settings {
    public static let fireworks = VortexSystem.Settings { settings in
        
        var sparkles = VortexSystem.Settings { sparkle in
            sparkle.tags = ["circle"]
            sparkle.spawnOccasion = .onUpdate
            sparkle.emissionLimit = 1
            sparkle.lifespan = 0.5
            sparkle.speed = 0.05
            sparkle.angleRange = .degrees(180)
            sparkle.size = 0.05
        }
        
        var explosions = VortexSystem.Settings { explosion in 
            explosion.tags = ["circle"]
            explosion.spawnOccasion = .onDeath
            explosion.position = [0.5, 0.5]
            explosion.birthRate = 100_000
            explosion.emissionLimit = 500
            explosion.speed = 0.5
            explosion.speedVariation = 1
            explosion.angleRange = .degrees(360)
            explosion.acceleration = [0, 1.5]
            explosion.dampingFactor = 4
            explosion.colors = .randomRamp(
                [.white, .pink, .pink],
                [.white, .blue, .blue],
                [.white, .green, .green],
                [.white, .orange, .orange],
                [.white, .cyan, .cyan]
            )
            explosion.size = 0.15
            explosion.sizeVariation = 0.1
            explosion.sizeMultiplierAtDeath = 0
        }
        
        settings.tags = ["circle"]
        settings.secondarySettings = [sparkles, explosions]
        settings.position = [0.5, 1]
        settings.birthRate = 2
        settings.emissionLimit = 1000
        settings.speed = 1.5
        settings.speedVariation = 0.75
        settings.angleRange = .degrees(60)
        settings.dampingFactor = 2
        settings.size = 0.15
        settings.stretchFactor = 4
    }
}

#Preview("Fireworks") {
    VortexView(.fireworks)
        .navigationSubtitle("Demonstrates multi-stage effects")
    .ignoresSafeArea(edges: .top)
}