Qt Quick Demo - Maroon in Trouble

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 import QtQuick 2.0
 import "logic.js" as Logic
 import "towers" as Towers

 Item {
     id: grid

     property int squareSize: 64
     property int rows: 6
     property int cols: 4
     property Item canvas: grid
     property int score: 0
     property int coins: 100
     property int lives: 3
     property int waveNumber: 0
     property int waveProgress: 0
     property var towers
     property var mobs
     property bool gameRunning: false
     property bool gameOver: false
     property bool errored: false
     property string errorString: ""

     width: cols * squareSize
     height: rows * squareSize

     function freshState() {
         lives = 3
         coins = 100
         score = 0
         waveNumber = 0
         waveProgress = 0
         gameOver = false
         gameRunning = false
         towerMenu.shown = false
         helpButton.comeBack();
     }

     Text {
         id: errorText // Mostly for debug purposes
         text: errorString
         visible: errored
         color: "red"
         font.pixelSize: 18
         wrapMode: Text.WordWrap
         width: parent.width / 1.2
         height: parent.height / 1.2
         anchors.centerIn: parent
         z: 1000
     }

     Timer {
         interval: 16
         running: true
         repeat: true
         onTriggered: Logic.tick()
     }

     MouseArea {
         id: ma
         anchors.fill: parent
         onClicked: {
             if (towerMenu.visible)
                 towerMenu.finish()
             else
                 towerMenu.open(mouse.x, mouse.y)
         }
     }

     Image {
         id: towerMenu
         visible: false
         z: 1500
         scale: 0.9
         opacity: 0.7
         property int dragDistance: 16
         property int targetRow: 0
         property int targetCol: 0
         property bool shown: false
         property bool towerExists: false

         function finish() {
             shown = false
         }

         function open(xp,yp) {
             if (!grid.gameRunning)
                 return
             targetRow = Logic.row(yp)
             targetCol = Logic.col(xp)
             if (targetRow == 0)
                 towerMenu.y = (targetRow + 1) * grid.squareSize
             else
                 towerMenu.y = (targetRow - 1) * grid.squareSize
             towerExists = (grid.towers[Logic.towerIdx(targetCol, targetRow)] != null)
             shown = true
             helpButton.goAway();
         }

         states: State {
             name: "shown"; when: towerMenu.shown && !grid.gameOver
             PropertyChanges { target: towerMenu; visible: true; scale: 1; opacity: 1 }
         }

         transitions: Transition {
             PropertyAction { property: "visible" }
             NumberAnimation { properties: "opacity,scale"; duration: 500; easing.type: Easing.OutElastic }
         }

         x: -32
         source: "gfx/dialog.png"
         Row {
             id: buttonRow
             height: 100
             anchors.centerIn: parent
             spacing: 8
             BuildButton {
                 row: towerMenu.targetRow; col: towerMenu.targetCol
                 anchors.verticalCenter: parent.verticalCenter
                 towerType: 1; index: 0
                 canBuild: !towerMenu.towerExists
                 source: "gfx/dialog-melee.png"
                 onClicked: towerMenu.finish()
             }
             BuildButton {
                 row: towerMenu.targetRow; col: towerMenu.targetCol
                 anchors.verticalCenter: parent.verticalCenter
                 towerType: 2; index: 1
                 canBuild: !towerMenu.towerExists
                 source: "gfx/dialog-shooter.png"
                 onClicked: towerMenu.finish()
             }
             BuildButton {
                 row: towerMenu.targetRow; col: towerMenu.targetCol
                 anchors.verticalCenter: parent.verticalCenter
                 towerType: 3; index: 2
                 canBuild: !towerMenu.towerExists
                 source: "gfx/dialog-bomb.png"
                 onClicked: towerMenu.finish()
             }
             BuildButton {
                 row: towerMenu.targetRow; col: towerMenu.targetCol
                 anchors.verticalCenter: parent.verticalCenter
                 towerType: 4; index: 3
                 canBuild: !towerMenu.towerExists
                 source: "gfx/dialog-factory.png"
                 onClicked: towerMenu.finish()
             }
         }
     }

     Keys.onPressed: { // Cheat Codes while Testing
         if (event.key == Qt.Key_Up && (event.modifiers & Qt.ShiftModifier))
             grid.coins += 10;
         if (event.key == Qt.Key_Left && (event.modifiers & Qt.ShiftModifier))
             grid.lives += 1;
         if (event.key == Qt.Key_Down && (event.modifiers & Qt.ShiftModifier))
             Logic.gameState.waveProgress += 1000;
         if (event.key == Qt.Key_Right && (event.modifiers & Qt.ShiftModifier))
             Logic.endGame();
     }

     Image {
         id: helpButton
         z: 1010
         source: "gfx/button-help.png"
         function goAway() {
             helpMA.enabled = false;
             helpButton.opacity = 0;
         }
         function comeBack() {
             helpMA.enabled = true;
             helpButton.opacity = 1;
         }
         Behavior on opacity { NumberAnimation {} }
         MouseArea {
             id: helpMA
             anchors.fill: parent
             onClicked: {helpImage.visible = true; helpButton.visible = false;}
         }

         anchors.horizontalCenter: parent.horizontalCenter
         anchors.bottom: parent.bottom
         anchors.bottomMargin: 0
     }

     Image {
         id: helpImage
         z: 1010
         source: "gfx/help.png"
         anchors.fill: parent
         visible: false
         MouseArea {
             anchors.fill: parent
             onClicked: helpImage.visible = false;
         }
     }

 }