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/****************************************************************************
**
** 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 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 Nokia Corporation and its Subsidiary(-ies) 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
ParticleSystem{
id: sys
width: 360
height: 600
running: true
Rectangle{
z: -1
anchors.fill: parent
color: "black"
Text{
anchors.bottom: parent.bottom
anchors.horizontalCenter: parent.horizontalCenter
font.pixelSize: 42
color: "white"
text: "It's all in QML."
}
}
property real petalLength: 180
property real petalRotation: 0
NumberAnimation on petalRotation{
from: 0;
to: 360;
loops: -1;
running: true
duration: 24000
}
function convert(a){return a*(Math.PI/180);}
Emitter{
lifeSpan: 4000
emitRate: 120
size: 12
anchors.centerIn: parent
onEmitParticle:{
particle.startSize = Math.max(12,Math.min(492,Math.tan(particle.t/2)*24));
var theta = Math.floor(Math.random() * 6.0) / 6.0;
theta *= 2.0*Math.PI;
theta += sys.convert(sys.petalRotation);
particle.initialVX = petalLength * Math.cos(theta);
particle.initialVY = petalLength * Math.sin(theta);
particle.initialAX = particle.initialVX * -0.5;
particle.initialAY = particle.initialVY * -0.5;
}
}
CustomParticle{
vertexShader:"
uniform lowp float qt_Opacity;
varying lowp float fFade;
varying highp vec2 fPos;
void main() {
qt_TexCoord0 = qt_ParticleTex;
highp float size = qt_ParticleData.z;
highp float endSize = qt_ParticleData.w;
highp float t = (qt_Timestamp - qt_ParticleData.x) / qt_ParticleData.y;
highp float currentSize = mix(size, endSize, t * t);
if (t < 0. || t > 1.)
currentSize = 0.;
highp vec2 pos = qt_ParticlePos
- currentSize / 2. + currentSize * qt_ParticleTex // adjust size
+ qt_ParticleVec.xy * t * qt_ParticleData.y // apply speed vector..
+ 0.5 * qt_ParticleVec.zw * pow(t * qt_ParticleData.y, 2.);
gl_Position = qt_Matrix * vec4(pos.x, pos.y, 0, 1);
highp float fadeIn = min(t * 20., 1.);
highp float fadeOut = 1. - max(0., min((t - 0.75) * 4., 1.));
fFade = fadeIn * fadeOut * qt_Opacity;
fPos = vec2(pos.x/360.0, pos.y/600.0);
}
"
fragmentShader: "
varying highp vec2 fPos;
varying lowp float fFade;
varying highp vec2 qt_TexCoord0;
void main() {//*2 because this generates dark colors mostly
highp vec2 circlePos = qt_TexCoord0*2.0 - vec2(1.0,1.0);
highp float dist = length(circlePos);
highp float circleFactor = max(min(1.0 - dist, 1.0), 0.0);
gl_FragColor = vec4(fPos.x*2.0 - fPos.y, fPos.y*2.0 - fPos.x, fPos.x*fPos.y*2.0, 0.0) * circleFactor * fFade;
}"
}
}
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