Qt Reference Documentation

snake.qml Example File

demos/declarative/snake/snake.qml
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 import Qt 4.7
 import "content" as Content
 import "content/snake.js" as Logic

 Rectangle {
     id: screen;
     SystemPalette { id: activePalette }
     color: activePalette.window

     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;
         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 ;
     }

     Image {
         Image {
             id: title
             source: "content/pics/snake.jpg"
             fillMode: Image.PreserveAspectCrop
             anchors.fill: parent
             anchors.horizontalCenter: parent.horizontalCenter
             anchors.verticalCenter: parent.verticalCenter
             Behavior on opacity { NumberAnimation { duration: 500 } }

             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"
             when: startHeartbeatTimer.running
             PropertyChanges {target: progressIndicator; width: 200}
             PropertyChanges {target: title; opacity: 0}
             PropertyChanges {target: progressBar; opacity: 1}
         },
         State {
             name: "running"
             when: (heartbeat.running && !startHeartbeatTimer.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 }

         }
     ]

 }
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