- Qt 5.15
- Qt Quick Demo - Maroon in Trouble
- Qt 5.15.13 Reference Documentation

# Qt Quick Demo - Maroon in Trouble

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     import QtQuick 2.0
     import QtQuick.Particles 2.0
     import "content"
     import "content/logic.js" as Logic

     Item {
         id: root
         width: 320
         height: 480
         property var gameState
         property bool passedSplash: false

         Image {
             source:"content/gfx/background.png"
             anchors.bottom: view.bottom

             ParticleSystem {
                 id: particles
                 anchors.fill: parent

                 ImageParticle {
                     id: bubble
                     anchors.fill: parent
                     source: "content/gfx/catch.png"
                     opacity: 0.25
                 }

                 Wander {
                     xVariance: 25;
                     pace: 25;
                 }

                 Emitter {
                     width: parent.width
                     height: 150
                     anchors.bottom: parent.bottom
                     anchors.bottomMargin: 3
                     startTime: 15000

                     emitRate: 2
                     lifeSpan: 15000

                     acceleration: PointDirection{ y: -6; xVariation: 2; yVariation: 2 }

                     size: 24
                     sizeVariation: 16
                 }
             }
         }

         Column {
             id: view
             y: -(height - 480)
             width: 320

             GameOverScreen { gameCanvas: canvas }

             Item {
                 id: canvasArea
                 width: 320
                 height: 480

                 Row {
                     height: childrenRect.height
                     Image {
                         id: wave
                         y: 30
                         source:"content/gfx/wave.png"
                     }
                     Image {
                         y: 30
                         source:"content/gfx/wave.png"
                     }
                     NumberAnimation on x { from: 0; to: -(wave.width); duration: 16000; loops: Animation.Infinite }
                     SequentialAnimation on y {
                         loops: Animation.Infinite
                         NumberAnimation { from: y - 2; to: y + 2; duration: 1600; easing.type: Easing.InOutQuad }
                         NumberAnimation { from: y + 2; to: y - 2; duration: 1600; easing.type: Easing.InOutQuad }
                     }
                 }

                 Row {
                     opacity: 0.5
                     Image {
                         id: wave2
                         y: 25
                         source: "content/gfx/wave.png"
                     }
                     Image {
                         y: 25
                         source: "content/gfx/wave.png"
                     }
                     NumberAnimation on x { from: -(wave2.width); to: 0; duration: 32000; loops: Animation.Infinite }
                     SequentialAnimation on y {
                         loops: Animation.Infinite
                         NumberAnimation { from: y + 2; to: y - 2; duration: 1600; easing.type: Easing.InOutQuad }
                         NumberAnimation { from: y - 2; to: y + 2; duration: 1600; easing.type: Easing.InOutQuad }
                     }
                 }

                 Image {
                     source: "content/gfx/sunlight.png"
                     opacity: 0.02
                     y: 0
                     anchors.horizontalCenter: parent.horizontalCenter
                     transformOrigin: Item.Top
                     SequentialAnimation on rotation {
                         loops: Animation.Infinite
                         NumberAnimation { from: -10; to: 10; duration: 8000; easing.type: Easing.InOutSine }
                         NumberAnimation { from: 10; to: -10; duration: 8000; easing.type: Easing.InOutSine }
                     }
                 }

                 Image {
                     source: "content/gfx/sunlight.png"
                     opacity: 0.04
                     y: 20
                     anchors.horizontalCenter: parent.horizontalCenter
                     transformOrigin: Item.Top
                     SequentialAnimation on rotation {
                         loops: Animation.Infinite
                         NumberAnimation { from: 10; to: -10; duration: 8000; easing.type: Easing.InOutSine }
                         NumberAnimation { from: -10; to: 10; duration: 8000; easing.type: Easing.InOutSine }
                     }
                 }

                 Image {
                     source: "content/gfx/grid.png"
                     opacity: 0.5
                 }

                 GameCanvas {
                     id: canvas
                     anchors.bottom: parent.bottom
                     anchors.bottomMargin: 20
                     x: 32
                     focus: true
                 }

                 InfoBar { anchors.bottom: canvas.top; anchors.bottomMargin: 6; width: parent.width }

                 //3..2..1..go
                 Timer {
                     id: countdownTimer
                     interval: 1000
                     running: root.countdown < 5
                     repeat: true
                     onTriggered: root.countdown++
                 }
                 Repeater {
                     model: ["content/gfx/text-blank.png", "content/gfx/text-3.png", "content/gfx/text-2.png", "content/gfx/text-1.png", "content/gfx/text-go.png"]
                     delegate: Image {
                         visible: root.countdown <= index
                         opacity: root.countdown == index ? 0.5 : 0.1
                         scale: root.countdown >= index ? 1.0 : 0.0
                         source: modelData
                         Behavior on opacity { NumberAnimation {} }
                         Behavior on scale { NumberAnimation {} }
                     }
                 }
             }

             NewGameScreen {
                 onStartButtonClicked: root.passedSplash = true
             }
         }

         property int countdown: 10
         Timer {
             id: gameStarter
             interval: 4000
             running: false
             repeat: false
             onTriggered: Logic.startGame(canvas);
         }

         states: [
             State {
                 name: "gameOn"; when: gameState.gameOver == false && passedSplash
                 PropertyChanges { target: view; y: -(height - 960) }
                 StateChangeScript { script: root.countdown = 0; }
                 PropertyChanges { target: gameStarter; running: true }
             },
             State {
                 name: "gameOver"; when: gameState.gameOver == true
                 PropertyChanges { target: view; y: 0 }
             }
         ]

         transitions: Transition {
             NumberAnimation { properties: "x,y"; duration: 1200; easing.type: Easing.OutQuad }
         }

         Component.onCompleted: gameState = Logic.newGameState(canvas);
     }