- Qt 5.3
- Qt Quick
- Qt Quick Demo - Maroon in Trouble
- GameCanvas.qml Example File
- Qt 5.3.2 Reference Documentation

# GameCanvas.qml Example File

demos/maroon/content/GameCanvas.qml

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
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    **     distribution.
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    **     of its contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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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;
            }
        }

    }