/**************************************************************************** ** ** Copyright (C) 2015 The Qt Company Ltd. ** Contact: http://www.qt.io/licensing/ ** ** 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 ** 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 2.0 import QtQuick.Particles 2.0 Rectangle { id: root color: "black" width: 640 height: 480 ParticleSystem { id: sys } ImageParticle { system: sys source: "qrc:///particleresources/glowdot.png" color: "white" colorVariation: 1.0 alpha: 0.1 entryEffect: ImageParticle.None } Emitter { id: emitter system: sys width: parent.width/2 velocity: PointDirection {y: 72; yVariation: 24} lifeSpan: 10000 emitRate: 1000 enabled: false size: 32 } //! [fake] Item { id: fakeEmitter function burst(number) { while (number > 0) { var item = fakeParticle.createObject(root); item.lifeSpan = Math.random() * 5000 + 5000; item.x = Math.random() * (root.width/2) + (root.width/2); item.y = 0; number--; } } Component { id: fakeParticle Image { id: container property int lifeSpan: 10000 width: 32 height: 32 source: "qrc:///particleresources/glowdot.png" y: 0 PropertyAnimation on y {from: -16; to: root.height-16; duration: container.lifeSpan; running: true} SequentialAnimation on opacity { running: true NumberAnimation { from:0; to: 1; duration: 500} PauseAnimation { duration: container.lifeSpan - 1000} NumberAnimation { from:1; to: 0; duration: 500} ScriptAction { script: container.destroy(); } } } } } //! [fake] //Hooked to a timer, but click for extra bursts that really stress performance Timer { interval: 10000 triggeredOnStart: true repeat: true running: true onTriggered: { emitter.burst(1000); fakeEmitter.burst(1000); } } Text { anchors.left: parent.left anchors.bottom: parent.bottom text: "1000 particles" color: "white" MouseArea { anchors.fill: parent onClicked: emitter.burst(1000); } } Text { anchors.right: parent.right anchors.bottom: parent.bottom text: "1000 items" color: "white" MouseArea { anchors.fill: parent onClicked: fakeEmitter.burst(1000); } } }