GameCanvas.qml Example File | Qt 5.12

- Qt 5.12
- Qt Quick Demo - Maroon in Trouble
- GameCanvas.qml Example File
- Qt 5.12.10 Reference Documentation

# GameCanvas.qml Example File

demos/maroon/content/GameCanvas.qml

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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;
             }
         }

     }