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Flask of Rum - Slot Game

 import Felgo 3.0
 import QtQuick 2.0
 import "slotmachine"

 GameWindow {
   id: gameWindow

   // You get free licenseKeys from https://felgo.com/licenseKey
   // With a licenseKey you can:
   //  * Publish your games & apps for the app stores
   //  * Remove the Felgo Splash Screen or set a custom one (available with the Pro Licenses)
   //  * Add plugins to monetize, analyze & improve your apps (available with the Pro Licenses)
   //licenseKey: "<generate one from https://felgo.com/licenseKey>"

   activeScene: scene

   // the size of the Window can be changed at runtime by pressing Ctrl (or Cmd on Mac) + the number keys 1-8
   // the content of the logical scene size (480x320 for landscape mode by default) gets scaled to the window size based on the scaleMode
   // you can set this size to any resolution you would like your project to start with, most of the times the one of your main target device
   // this resolution is for iPhone 4 & iPhone 4S
   screenWidth: 960
   screenHeight: 640

   Scene {
     id: scene

     // the "logical size" - the scene content is auto-scaled to match the GameWindow size
     width: 480
     height: 320

     // properties for the game
     property int betAmount: 4 // amount to bet per line
     property int creditAmount: 400 // player credit for gambling

     // animate credit amount when changed
     Behavior on creditAmount {
       PropertyAnimation { duration: scene.betAmount * 50 }
     }

     // fill game window with background
     Rectangle {
       anchors.fill: scene.gameWindowAnchorItem
       color: "#400000"
     }

     // add slot machine
     FlaskOfRumMachine {
       id: slotMachine

       // we center it horzizontally and move it 10 px "under" the top bar
       // because the image of the bar casts a shadow on on the slot machine
       anchors.horizontalCenter: scene.horizontalCenter
       anchors.top: topBar.bottom
       anchors.topMargin: -10

       // we want the slot machine to auto-size depending on the available height
       // the slotmachine will use the game window height except for the topBar and bottomBar area
       // like with the top bar, the bottom bar also casts a shadow on the to slot machine
       height: scene.gameWindowAnchorItem.height - (topBar.height + anchors.topMargin) - (bottomBar.height - 10)

       // we then calculate the default item height based on the actual slotmachine height and row count
       defaultItemHeight: Math.round(slotMachine.height / slotMachine.rowCount)

       // and change the reel width to match the item height (to maintain the width/height ratio of the items)
       defaultReelWidth: Math.round(defaultItemHeight / 80 * 67)

       // velocity of spin should decrease/increase along with item height
       spinVelocity: Math.round(defaultItemHeight / 80 * 750)

       // link signal to handler function
       onSpinEnded: scene.spinEnded()

       // choose random delay to stop each reel for every spin
       onSpinStarted: {
         // delay stop of each reel between 350 and 700 ms
         slotMachine.reelStopDelay = utils.generateRandomValueBetween(350, 700)
       }
     }

     // validator to check if player has won
     WinValidator {
       id: winValidator
       height: slotMachine.height // height is the same as slotmachine height
       width: Math.round(height /  240 * 408) // width/height ratio should remain constant
       anchors.centerIn: scene.gameWindowAnchorItem
     }

     // configure top bar
     TopBar {
       id: topBar
       width: scene.gameWindowAnchorItem.width
       anchors.top: scene.gameWindowAnchorItem.top
       anchors.horizontalCenter: scene.gameWindowAnchorItem.horizontalCenter
     }

     // configure bottom bar
     BottomBar {
       id: bottomBar
       width: scene.gameWindowAnchorItem.width
       anchors.bottom: scene.gameWindowAnchorItem.bottom
       anchors.horizontalCenter: scene.gameWindowAnchorItem.horizontalCenter

       // link signals to handler functions
       onStartClicked: scene.startSlotMachine()
       onAutoClicked: scene.autoPlaySlotMachine()
       onIncreaseBetClicked: scene.increaseBetAmount()
       onDecreaseBetClicked: scene.decreaseBetAmount()
       onMaxBetClicked: scene.maxBetAmount()
     }

     // increase bet
     function increaseBetAmount() {
       // prevent bet changes while start button is active (machine is running)
       if(bottomBar.startActive)
         return

       // increase bet amount to next bigger step
       if (betAmount < 5 && creditAmount >= 5)
         betAmount = 5
       else if (betAmount < 8 && creditAmount >= 8)
         betAmount = 8
       else if (betAmount < 10 && creditAmount >= 10)
         betAmount = 10
       else if (betAmount < 15 && creditAmount >= 15)
         betAmount = 15
       else if (betAmount < 20 && creditAmount >= 20)
         betAmount = 20
     }

     // decrease bet
     function decreaseBetAmount() {
       // prevent bet changes while start button is active (machine is running)
       if(bottomBar.startActive)
         return

       // decrease bet amount to next smaller step
       if (betAmount > 15 && creditAmount >= 15)
         betAmount = 15
       else if (betAmount > 10 && creditAmount >= 10)
         betAmount = 10
       else if (betAmount > 8 && creditAmount >= 8)
         betAmount = 8
       else if (betAmount > 5 && creditAmount >= 5)
         betAmount = 5
       else if (betAmount > 4)
         betAmount = 4
     }

     // set maximum bet
     function maxBetAmount() {
       // prevent bet changes while machine is started
       if(bottomBar.startActive)
         return

       // set bet amount to maximum affordable available step
       if(creditAmount >= 20)
         betAmount = 20
       else if(creditAmount >= 15)
         betAmount = 15
       else if(creditAmount >= 10)
         betAmount = 10
       else if(creditAmount >= 8)
         betAmount = 8
       else if(creditAmount >= 5)
         betAmount = 5
       else if(creditAmount >= 4)
         betAmount = 4
     }

     // auto play slot machine
     function autoPlaySlotMachine() {
       // switch active state of auto button
       bottomBar.autoActive = !bottomBar.autoActive
       if(bottomBar.autoActive)
         startSlotMachine()
     }

     // start slot machine
     function startSlotMachine() {
       if(!slotMachine.spinning && scene.creditAmount >= scene.betAmount) {
         bottomBar.startActive = true

         // reduce player credits
         scene.creditAmount -= scene.betAmount

         // start machine
         winValidator.reset()
         var stopInterval = utils.generateRandomValueBetween(500, 1000) // between 500 and 1000 ms
         slotMachine.spin(stopInterval)
       }
     }

     // when spin is finished -> validate result
     function spinEnded() {
       bottomBar.startActive = false
       var won = winValidator.validate(slotMachine)
       if(won)
         winValidator.showWinningLines()
       else if(bottomBar.autoActive)
         startSlotMachine()
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