emitterV1

//
//  ContentViewA.swift
//  Emitter
//
//  Created by localuser on 18.04.23.
//

import Foundation
import SwiftUI

//
//  ContentView.swift
//  Emitter
//
//  Created by localuser on 18.04.23.


import SwiftUI

struct ContentView: View {
    @State var numParticlesToEmit = 100
    var body: some View {
        ZStack {
            ForEach((0..<numParticlesToEmit), id: \.self) { num in
                ParticleBuild(colorGroup: ColoursAvailable.colorA)
            }
        }
    }
}

struct ParticleBuild: View {
    @State var colorGroup:ColoursAvailable
    @ViewBuilder
    var body: some View {
        let newAttr = Attributes(colorIndex: colorGroup)
        Particle(attributes: newAttr)
    }
}

struct Particle: View {
    @State var attributes:Attributes!
    @State var opacity = 1.0
    @State var xOffset = 0.0
    @State var yOffset = 0.0
    var body: some View {
            Circle()
                .fill(returnColors()[attributes.colour])
                .frame(width: 16, height: 16)
                .scaleEffect(attributes.scaleRange)
                .opacity(opacity)
                .offset(x: xOffset, y:yOffset)
                .onAppear(perform: {
                    withAnimation(.easeIn(duration: attributes.lifeTimeRange)) {
                        opacity = 0
                        xOffset = attributes.xAcceleration
                        yOffset = attributes.yAcceleration
                    }
                })
                .blendMode(.screen)
    }

    func returnColors() -> [Color] {
        switch attributes.colorIndex {
        case ColoursAvailable.colorA:
            return Attributes.coloursA
        case ColoursAvailable.colorB:
            return Attributes.coloursB
        case ColoursAvailable.colorC:
            return Attributes.coloursC
        }
    }
}
enum ColoursAvailable:Int {
    case colorA = 0
    case colorB = 1
    case colorC = 2
}

struct Attributes {
    @State var colorIndex:ColoursAvailable
    static var coloursA = [Color.red, Color.orange, Color.yellow]
    static var coloursB = [Color.blue, Color.purple, Color.indigo]
    static var coloursC = [Color.teal, Color.green, Color.mint]
    @State var birthRate = 10
    @State var lifeTimeRange = Double.random(in: 5...10)
    @State var xAcceleration = Double.random(in: -100...100)
    @State var yAcceleration = Double.random(in: -100...100)
    @State var colour = Int.random(in: 0..<coloursA.count)
    @State var scaleRange = Double.random(in: 0.1...0.9)
}



struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}