Qt Reference Documentation

Missile.qml Example File

demos/mobile/quickhit/Missile.qml
 /****************************************************************************
 **
 ** Copyright (C) 2015 The Qt Company Ltd.
 ** Contact: http://www.qt.io/licensing/
 **
 ** This file is part of the QtDeclarative module 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
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 import QtQuick 1.0

 Item {
     id: missile
     objectName: "missile"
     opacity: 0 // transparent by default

     property int fromYpos
     property int toYpos
     property variant myMissileSize
     property bool enemyMissile: false
     property int defaultX: 0
     property int defaultY: 0

     function storeDefaultPos() {
         defaultX = missile.x
         defaultY = missile.y
     }

     function setToDefaultPos() {
         missile.x = defaultX
         missile.y = defaultY
         opacity = 0.5
     }

     function createGraphicsForLevel() {
         missile.myMissileSize = LevelPlugin.graphSize(LevelPlugin.pathToMissilePic())
         missile.height = myMissileSize.height;
         missile.width = myMissileSize.width;
         if (missile.enemyMissile) {
             missileImage.source = "file:/"+LevelPlugin.pathToEnemyMissilePic()
         } else {
             missileImage.source = "file:/"+LevelPlugin.pathToMissilePic()
         }
     }

     // Execute fire!
     function fire(aXpox, aFromYpos, aToYpos) {
         missile.x = aXpox - missile.width / 2
         missile.y = aFromYpos
         missile.fromYpos = aFromYpos
         missile.toYpos = aToYpos
         missile.opacity = 1
         GameEngine.playSound(2) // NOTE: 3 for your missile sound
         flying.restart()
     }

     // Enemy fires!
     function enemyFire(aXpox, aFromYpos, aToYpos) {
         missile.x = aXpox - missile.width / 2
         missile.y = aFromYpos
         missile.fromYpos = aFromYpos
         missile.toYpos = aToYpos
         missile.opacity = 1
         GameEngine.playSound(3) // NOTE: 3 for enemy missile sound
         flyingEnemy.restart()
     }

     // Stop missile
     function stop() {
         flying.stop()
     }

     // Pause missile
     function pause(doPause) {
         if (doPause) {
             flying.pause()
             flyingEnemy.pause()
         } else {
             flying.resume()
             flyingEnemy.resume()
         }
     }

     Component.onCompleted: {
         if (!enemyMissile) {
             storeDefaultPos()
             setToDefaultPos()
         }
     }

     // Animates missile flying to the target
     SequentialAnimation {
         id: flying
         PropertyAnimation {target: missile; properties: "y";
             from: fromYpos; to: toYpos; duration: 2000; easing.type: Easing.InCubic }
         //PropertyAction {target: missile; properties: "opacity"; value: 0}
         ScriptAction { script: setToDefaultPos() }
     }

     SequentialAnimation {
         id: flyingEnemy
         PropertyAnimation {target: missile; properties: "y";
             from: fromYpos; to: toYpos; duration: 2000; easing.type: Easing.InCubic }
         PropertyAction {target: missile; properties: "opacity"; value: 0}
     }

     Image {
         id: missileImage
         smooth: true
     }
 }