PlantUML Web Server

@startuml
'https://www.plantuml.com/plantuml/uml/jLHBRnen4BxlhnXnoKObaNgDUWY4HoCXWbXogAeUpDe5DtvGFmehod-llVOsQzYqfvnOVz_CC8zlvbuRf8pbBCkoArWDbjFngiW4uaJlK4bWXTI6cDiV6evP1b0of7K4uGW03WEu6Kh921BmYsgwPYI0SylNHC4XULN9Qq-nsGPaySZHXW3bc_2UM54QAWMKYB4rAb-Un6TgifhyK4gXZRAbaIe_zAlhW6A5zddyRZAYsdareDvA-VSXXMUQw1FXuLEhHe9nrHIQ9BqbTBFzToRHqlak91L6vsV1HxPyUQ_OnKzBbIBilUA7k1FatQeG_QWDChGyUQT03wivuYJtEkh3eGzLFvtZzONV4WaiUV3EEprY5bUm90nvQUWjtMaFnL8__RwvQSyjPMBJBucpZhc0QOrmUvkeuGwi9Xr6xQc-PNC-dM1tyhitVPx3O3w2uVDiDbvbhHsSMf4ke4VWcEnDQPMMAa25j09FA2FW16_grpb1-CvKBIOEtJXpvw8JK16EgA1YqwA6bZ5YO5t_wA_VpdPM2c_x4ETtGRe1IeGRkaEDJHuTYwrgt_n2hCiaopSstd7foaVSAmfVt8BNViToOyiXlMoGdZReF8RGkc__ls5Hw_MSUnzxu4JQuqXKlPZ97JXlu-hLJZjUFCN3qt8CeyTYCHjyQMkdAAKY8wft35MfY1Bgs7s4OsLUHZFotQIWT--efMDccfZwpt91zlL7n1760JToWF6hSIXIvyBo-1awuclDxed0bhC_

' Subject
namespace Subject.js {
  class Subject{
    - observers: Objects[]

+ constructor()
    + subscribe(observer: Object)
    + unsubscribe(observer: Object)
    + unsubscribeAll()
    + notifySubscribers()
  }

interface Observer{
    +update(source: string, ...others)
  }

Subject .. Observer #blue;line.dotted;text:blue   : notifySubscribers calls update 
}

' Targets
namespace Target.js {

class Target extends Subject.js.Subject implements Subject.js.Observer{   
    -visible: boolean
    -x: number
    -y: number
    -width: number
    -height: number
    -img: PImage

+constructor(x:number, ,y:number, width:number)
    +getPoints(): number
    +draw()
    +isHit(x:number, y:number): boolean
    +shoot(x:number, y:number)

+update(source: string, ...others)
  }

class TeddyTarget extends Target {
    +constructor(x:number, y:number, width:number)
    +getPoints(): number
  }

class DuckTarget extends Target{
    +constructor(x:number, y:number, width:number)
    +getPoints(): number
  }

class SquirrelTarget extends Target{
    +constructor(x:number, y:number, width:number)
    +getPoints(): number
  }

class TargetFactory<Singleton>{
    +{static}getInstance(): TargetFactory
    +getTargetsByName(targetNames: string[], targetWidth:number, y:number) 
    +getRandomTargets(numTargets:number, targetWidth:number, y:number)

}
    note left of TargetFactory : getInstance is STATIC

' Relationships
  TargetFactory .. TeddyTarget  #blue;line.dotted;text:blue : uses 
  TargetFactory .. DuckTarget #blue;line.dotted;text:blue : uses 
  TargetFactory .. SquirrelTarget #blue;line.dotted;text:blue : uses 
}

' Gun and Bullet

namespace Gun.js {

class Gun extends Subject.js.Subject {
    -cursor: PImage 
    -shotSound: SoundFile 
    -emptySound: SoundFile 
    -totShots: number
    -remainingShots: number
    -bullets: Bullet[]

+constructor(totShots:number)
    +draw()
    +reload()
    +getRemainingShots():number
    +shoot()
  }

class Bullet {
    -x:number
    -y:number
    -visible: boolean
    -img:PImage

+constructor(x:number, y:number)
    +draw()
  }

Gun "1" -- "many" Bullet #blue;line.dotted;text:blue : contains 
}

' Score Display

namespace ScoreDisplay.js  {

class ScoreDisplay implements Subject.js.Observer{
    -img: PImage 
    -shotLeft: number
    -score: number

+constructor(initialBullets:number)
    +draw()
    +resetScore()
    +addScore(scoreToAdd:number)
    +setBullets(numBullets:number)
    
    +update(source: string, ...others)
  }
}
@enduml

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