Qt Reference Documentation

# snake.qml Example File

demos/declarative/snake/snake.qml

     /****************************************************************************
     **
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the QtDeclarative module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** GNU Lesser General Public License Usage
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     ** License version 2.1 as published by the Free Software Foundation and
     ** appearing in the file LICENSE.LGPL included in the packaging of this
     ** file. Please review the following information to ensure the GNU Lesser
     ** General Public License version 2.1 requirements will be met:
     ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
     **
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     ** rights. These rights are described in the Nokia Qt LGPL Exception
     ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU General
     ** Public License version 3.0 as published by the Free Software Foundation
     ** and appearing in the file LICENSE.GPL included in the packaging of this
     ** file. Please review the following information to ensure the GNU General
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     ** Alternatively, this file may be used in accordance with the terms and
     ** conditions contained in a signed written agreement between you and Nokia.
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     import QtQuick 1.0
     import "content" as Content
     import "content/snake.js" as Logic

     Rectangle {
         id: screen;
         SystemPalette { id: activePalette }
         color: activePalette.window
         property bool activeGame: false

         property int gridSize : 34
         property int margin: 4
         property int numRowsAvailable: Math.floor((height-32-2*margin)/gridSize)
         property int numColumnsAvailable: Math.floor((width-2*margin)/gridSize)

         property int lastScore : 0

         property int score: 0;
         property int heartbeatInterval: 200
         property int halfbeatInterval: 160

         width: 480
         height: 750

         property int direction
         property int headDirection

         property variant head;

         Content.HighScoreModel {
             id: highScores
             game: "Snake"
         }

         Timer {
             id: heartbeat;
             interval: heartbeatInterval;
             running: activeGame && runtime.isActiveWindow
             repeat: true
             onTriggered: { Logic.move() }
         }
         Timer {
             id: halfbeat;
             interval: halfbeatInterval;
             repeat: true
             running: heartbeat.running
             onTriggered: { Logic.moveSkull() }
         }
         Timer {
             id: startNewGameTimer;
             interval: 700;
             onTriggered: { Logic.startNewGame(); }
         }

         Timer {
             id: startHeartbeatTimer;
             interval: 1000 ;
             onTriggered: { state = "running"; activeGame = true; }
         }

         Image{
             id: pauseDialog
             z: 1
             source: "content/pics/pause.png"
             anchors.centerIn: parent;
             //opacity is deliberately not animated
             opacity: activeGame && !Qt.application.active
         }

         Image {
             Image {
                 id: title
                 source: "content/pics/snake.jpg"
                 fillMode: Image.PreserveAspectCrop
                 anchors.fill: parent
                 anchors.horizontalCenter: parent.horizontalCenter
                 anchors.verticalCenter: parent.verticalCenter

                 Text {
                     color: "white"
                     font.pointSize: 24
                     horizontalAlignment: Text.AlignHCenter
                     text: "Last Score:\t" + lastScore + "\nHighscore:\t" + highScores.topScore;
                     anchors.horizontalCenter: parent.horizontalCenter
                     anchors.bottom: parent.bottom
                     anchors.bottomMargin: gridSize
                 }
             }

             source: "content/pics/background.png"
             fillMode: Image.PreserveAspectCrop

             anchors.left: parent.left
             anchors.right: parent.right
             anchors.top: parent.top
             anchors.bottom: toolbar.top

             Rectangle {
                 id: playfield
                 border.width: 1
                 border.color: "white"
                 color: "transparent"
                 anchors.horizontalCenter: parent.horizontalCenter
                 y: (screen.height - 32 - height)/2;
                 width: numColumnsAvailable * gridSize + 2*margin
                 height: numRowsAvailable * gridSize + 2*margin

                 Content.Skull {
                     id: skull
                 }

                 MouseArea {
                     anchors.fill: parent
                     onPressed: {
                         if (!head || !heartbeat.running) {
                             Logic.startNewGame();
                             return;
                         }
                         if (direction == 0 || direction == 2)
                             Logic.scheduleDirection((mouseX > (head.x + head.width/2)) ? 1 : 3);
                         else
                             Logic.scheduleDirection((mouseY > (head.y + head.height/2)) ? 2 : 0);
                     }
                 }
             }

         }

         Rectangle {
             id: progressBar
             opacity: 0
             Behavior on opacity { NumberAnimation { duration: 200 } }
             color: "transparent"
             border.width: 2
             border.color: "#221edd"
             x: 50
             y: 50
             width: 200
             height: 30
             anchors.horizontalCenter: parent.horizontalCenter
             anchors.verticalCenter: parent.verticalCenter
             anchors.verticalCenterOffset: 40

             Rectangle {
                 id: progressIndicator
                 color: "#221edd";
                 width: 0;
                 height: 30;
             }
         }

         Rectangle {
             id: toolbar
             color: activePalette.window
             height: 32; width: parent.width
             anchors.bottom: screen.bottom

             Content.Button {
                 id: btnA; text: "New Game"; onClicked: Logic.startNewGame();
                 anchors.left: parent.left; anchors.leftMargin: 3
                 anchors.verticalCenter: parent.verticalCenter
             }

             Content.Button {
                 text: "Quit"
                 anchors { left: btnA.right; leftMargin: 3; verticalCenter: parent.verticalCenter }
                 onClicked: Qt.quit();
             }

             Text {
                 color: activePalette.text
                 text: "Score: " + score; font.bold: true
                 anchors.right: parent.right; anchors.rightMargin: 3
                 anchors.verticalCenter: parent.verticalCenter
             }
         }

         focus: true
         Keys.onSpacePressed: Logic.startNewGame();
         Keys.onLeftPressed: if (state == "starting" || direction != 1) Logic.scheduleDirection(3);
         Keys.onRightPressed: if (state == "starting" || direction != 3) Logic.scheduleDirection(1);
         Keys.onUpPressed: if (state == "starting" || direction != 2) Logic.scheduleDirection(0);
         Keys.onDownPressed: if (state == "starting" || direction != 0) Logic.scheduleDirection(2);

         states: [
             State {
                 name: "starting"
                 PropertyChanges {target: progressIndicator; width: 200}
                 PropertyChanges {target: title; opacity: 0}
                 PropertyChanges {target: progressBar; opacity: 1}
             },
             State {
                 name: "running"
                 PropertyChanges {target: progressIndicator; width: 200}
                 PropertyChanges {target: title; opacity: 0}
                 PropertyChanges {target: skull; row: 0; column: 0; }
                 PropertyChanges {target: skull; spawned: 1}
             }
         ]

         transitions: [
             Transition {
                 from: "*"
                 to: "starting"
                 NumberAnimation { target: progressIndicator; property: "width"; duration: 1000 }
                 NumberAnimation { target: title; property: "opacity"; duration: 500 }
             },
             Transition {
                 NumberAnimation { target: title; property: "opacity"; duration: 500 }
             }
         ]

     }