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<h1 class="title">gradients.cpp Example File</h1>
<span class="small-subtitle">demos/gradients/gradients.cpp</span>
<!-- $$$demos/gradients/gradients.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company 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 Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
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** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &quot;gradients.h&quot;</span>
<span class="preprocessor">#include &quot;hoverpoints.h&quot;</span>
ShadeWidget<span class="operator">::</span>ShadeWidget(ShadeType type<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)<span class="operator">,</span> m_shade_type(type)<span class="operator">,</span> m_alpha_gradient(<span class="type"><a href="qlineargradient.html">QLinearGradient</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>))
{
<span class="comment">// Checkers background</span>
<span class="keyword">if</span> (m_shade_type <span class="operator">=</span><span class="operator">=</span> ARGBShade) {
<span class="type"><a href="qpixmap.html">QPixmap</a></span> pm(<span class="number">20</span><span class="operator">,</span> <span class="number">20</span>);
<span class="type"><a href="qpainter.html">QPainter</a></span> pmp(<span class="operator">&amp;</span>pm);
pmp<span class="operator">.</span>fillRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>lightGray);
pmp<span class="operator">.</span>fillRect(<span class="number">10</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>lightGray);
pmp<span class="operator">.</span>fillRect(<span class="number">0</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>darkGray);
pmp<span class="operator">.</span>fillRect(<span class="number">10</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>darkGray);
pmp<span class="operator">.</span>end();
<span class="type"><a href="qpalette.html">QPalette</a></span> pal <span class="operator">=</span> palette();
pal<span class="operator">.</span>setBrush(backgroundRole()<span class="operator">,</span> <span class="type"><a href="qbrush.html">QBrush</a></span>(pm));
setAutoFillBackground(<span class="keyword">true</span>);
setPalette(pal);
} <span class="keyword">else</span> {
setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_NoBackground);
}
<span class="type"><a href="qpolygonf.html">QPolygonF</a></span> points;
points <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> sizeHint()<span class="operator">.</span>height())
<span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(sizeHint()<span class="operator">.</span>width()<span class="operator">,</span> <span class="number">0</span>);
m_hoverPoints <span class="operator">=</span> <span class="keyword">new</span> HoverPoints(<span class="keyword">this</span><span class="operator">,</span> HoverPoints<span class="operator">::</span>CircleShape);
<span class="comment">// m_hoverPoints-&gt;setConnectionType(HoverPoints::LineConnection);</span>
m_hoverPoints<span class="operator">-</span><span class="operator">&gt;</span>setPoints(points);
m_hoverPoints<span class="operator">-</span><span class="operator">&gt;</span>setPointLock(<span class="number">0</span><span class="operator">,</span> HoverPoints<span class="operator">::</span>LockToLeft);
m_hoverPoints<span class="operator">-</span><span class="operator">&gt;</span>setPointLock(<span class="number">1</span><span class="operator">,</span> HoverPoints<span class="operator">::</span>LockToRight);
m_hoverPoints<span class="operator">-</span><span class="operator">&gt;</span>setSortType(HoverPoints<span class="operator">::</span>XSort);
setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Preferred<span class="operator">,</span> <span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Fixed);
connect(m_hoverPoints<span class="operator">,</span> SIGNAL(pointsChanged(<span class="type"><a href="qpolygonf.html">QPolygonF</a></span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(colorsChanged()));
}
<span class="type"><a href="qpolygonf.html">QPolygonF</a></span> ShadeWidget<span class="operator">::</span>points() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_hoverPoints<span class="operator">-</span><span class="operator">&gt;</span>points();
}
<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> ShadeWidget<span class="operator">::</span>colorAt(<span class="type">int</span> x)
{
generateShade();
<span class="type"><a href="qpolygonf.html">QPolygonF</a></span> pts <span class="operator">=</span> m_hoverPoints<span class="operator">-</span><span class="operator">&gt;</span>points();
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">1</span>; i <span class="operator">&lt;</span> pts<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">if</span> (pts<span class="operator">.</span>at(i<span class="operator">-</span><span class="number">1</span>)<span class="operator">.</span>x() <span class="operator">&lt;</span><span class="operator">=</span> x <span class="operator">&amp;</span><span class="operator">&amp;</span> pts<span class="operator">.</span>at(i)<span class="operator">.</span>x() <span class="operator">&gt;</span><span class="operator">=</span> x) {
<span class="type"><a href="qlinef.html">QLineF</a></span> l(pts<span class="operator">.</span>at(i<span class="operator">-</span><span class="number">1</span>)<span class="operator">,</span> pts<span class="operator">.</span>at(i));
l<span class="operator">.</span>setLength(l<span class="operator">.</span>length() <span class="operator">*</span> ((x <span class="operator">-</span> l<span class="operator">.</span>x1()) <span class="operator">/</span> l<span class="operator">.</span>dx()));
<span class="keyword">return</span> m_shade<span class="operator">.</span>pixel(<a href="qtglobal.html#qRound">qRound</a>(<a href="qtglobal.html#qMin">qMin</a>(l<span class="operator">.</span>x2()<span class="operator">,</span> (<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(m_shade<span class="operator">.</span>width() <span class="operator">-</span> <span class="number">1</span>))))<span class="operator">,</span>
<a href="qtglobal.html#qRound">qRound</a>(<a href="qtglobal.html#qMin">qMin</a>(l<span class="operator">.</span>y2()<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(m_shade<span class="operator">.</span>height() <span class="operator">-</span> <span class="number">1</span>))));
}
}
<span class="keyword">return</span> <span class="number">0</span>;
}
<span class="type">void</span> ShadeWidget<span class="operator">::</span>setGradientStops(<span class="keyword">const</span> <span class="type"><a href="qgradient.html#QGradientStops-typedef">QGradientStops</a></span> <span class="operator">&amp;</span>stops)
{
<span class="keyword">if</span> (m_shade_type <span class="operator">=</span><span class="operator">=</span> ARGBShade) {
m_alpha_gradient <span class="operator">=</span> <span class="type"><a href="qlineargradient.html">QLinearGradient</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> width()<span class="operator">,</span> <span class="number">0</span>);
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator">&lt;</span>stops<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type"><a href="qcolor.html">QColor</a></span> c <span class="operator">=</span> stops<span class="operator">.</span>at(i)<span class="operator">.</span>second;
m_alpha_gradient<span class="operator">.</span>setColorAt(stops<span class="operator">.</span>at(i)<span class="operator">.</span>first<span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span>(c<span class="operator">.</span>red()<span class="operator">,</span> c<span class="operator">.</span>green()<span class="operator">,</span> c<span class="operator">.</span>blue()));
}
m_shade <span class="operator">=</span> <span class="type"><a href="qimage.html">QImage</a></span>();
generateShade();
update();
}
}
<span class="type">void</span> ShadeWidget<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>)
{
generateShade();
<span class="type"><a href="qpainter.html">QPainter</a></span> p(<span class="keyword">this</span>);
p<span class="operator">.</span>drawImage(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> m_shade);
p<span class="operator">.</span>setPen(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">146</span><span class="operator">,</span> <span class="number">146</span><span class="operator">,</span> <span class="number">146</span>));
p<span class="operator">.</span>drawRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> width() <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> height() <span class="operator">-</span> <span class="number">1</span>);
}
<span class="type">void</span> ShadeWidget<span class="operator">::</span>generateShade()
{
<span class="keyword">if</span> (m_shade<span class="operator">.</span>isNull() <span class="operator">|</span><span class="operator">|</span> m_shade<span class="operator">.</span>size() <span class="operator">!</span><span class="operator">=</span> size()) {
<span class="keyword">if</span> (m_shade_type <span class="operator">=</span><span class="operator">=</span> ARGBShade) {
m_shade <span class="operator">=</span> <span class="type"><a href="qimage.html">QImage</a></span>(size()<span class="operator">,</span> <span class="type"><a href="qimage.html">QImage</a></span><span class="operator">::</span>Format_ARGB32_Premultiplied);
m_shade<span class="operator">.</span>fill(<span class="number">0</span>);
<span class="type"><a href="qpainter.html">QPainter</a></span> p(<span class="operator">&amp;</span>m_shade);
p<span class="operator">.</span>fillRect(rect()<span class="operator">,</span> m_alpha_gradient);
p<span class="operator">.</span>setCompositionMode(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_DestinationIn);
<span class="type"><a href="qlineargradient.html">QLinearGradient</a></span> fade(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> height());
fade<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">255</span>));
fade<span class="operator">.</span>setColorAt(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>));
p<span class="operator">.</span>fillRect(rect()<span class="operator">,</span> fade);
} <span class="keyword">else</span> {
m_shade <span class="operator">=</span> <span class="type"><a href="qimage.html">QImage</a></span>(size()<span class="operator">,</span> <span class="type"><a href="qimage.html">QImage</a></span><span class="operator">::</span>Format_RGB32);
<span class="type"><a href="qlineargradient.html">QLinearGradient</a></span> shade(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> height());
shade<span class="operator">.</span>setColorAt(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
<span class="keyword">if</span> (m_shade_type <span class="operator">=</span><span class="operator">=</span> RedShade)
shade<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>red);
<span class="keyword">else</span> <span class="keyword">if</span> (m_shade_type <span class="operator">=</span><span class="operator">=</span> GreenShade)
shade<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>green);
<span class="keyword">else</span>
shade<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>blue);
<span class="type"><a href="qpainter.html">QPainter</a></span> p(<span class="operator">&amp;</span>m_shade);
p<span class="operator">.</span>fillRect(rect()<span class="operator">,</span> shade);
}
}
}
GradientEditor<span class="operator">::</span>GradientEditor(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
{
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>vbox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>(<span class="keyword">this</span>);
vbox<span class="operator">-</span><span class="operator">&gt;</span>setSpacing(<span class="number">1</span>);
vbox<span class="operator">-</span><span class="operator">&gt;</span>setMargin(<span class="number">1</span>);
m_red_shade <span class="operator">=</span> <span class="keyword">new</span> ShadeWidget(ShadeWidget<span class="operator">::</span>RedShade<span class="operator">,</span> <span class="keyword">this</span>);
m_green_shade <span class="operator">=</span> <span class="keyword">new</span> ShadeWidget(ShadeWidget<span class="operator">::</span>GreenShade<span class="operator">,</span> <span class="keyword">this</span>);
m_blue_shade <span class="operator">=</span> <span class="keyword">new</span> ShadeWidget(ShadeWidget<span class="operator">::</span>BlueShade<span class="operator">,</span> <span class="keyword">this</span>);
m_alpha_shade <span class="operator">=</span> <span class="keyword">new</span> ShadeWidget(ShadeWidget<span class="operator">::</span>ARGBShade<span class="operator">,</span> <span class="keyword">this</span>);
vbox<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_red_shade);
vbox<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_green_shade);
vbox<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_blue_shade);
vbox<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_alpha_shade);
connect(m_red_shade<span class="operator">,</span> SIGNAL(colorsChanged())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(pointsUpdated()));
connect(m_green_shade<span class="operator">,</span> SIGNAL(colorsChanged())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(pointsUpdated()));
connect(m_blue_shade<span class="operator">,</span> SIGNAL(colorsChanged())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(pointsUpdated()));
connect(m_alpha_shade<span class="operator">,</span> SIGNAL(colorsChanged())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(pointsUpdated()));
}
<span class="keyword">inline</span> <span class="keyword">static</span> <span class="type">bool</span> x_less_than(<span class="keyword">const</span> <span class="type"><a href="qpointf.html">QPointF</a></span> <span class="operator">&amp;</span>p1<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qpointf.html">QPointF</a></span> <span class="operator">&amp;</span>p2)
{
<span class="keyword">return</span> p1<span class="operator">.</span>x() <span class="operator">&lt;</span> p2<span class="operator">.</span>x();
}
<span class="type">void</span> GradientEditor<span class="operator">::</span>pointsUpdated()
{
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> w <span class="operator">=</span> m_alpha_shade<span class="operator">-</span><span class="operator">&gt;</span>width();
<span class="type"><a href="qgradient.html#QGradientStops-typedef">QGradientStops</a></span> stops;
<span class="type"><a href="qpolygonf.html">QPolygonF</a></span> points;
points <span class="operator">+</span><span class="operator">=</span> m_red_shade<span class="operator">-</span><span class="operator">&gt;</span>points();
points <span class="operator">+</span><span class="operator">=</span> m_green_shade<span class="operator">-</span><span class="operator">&gt;</span>points();
points <span class="operator">+</span><span class="operator">=</span> m_blue_shade<span class="operator">-</span><span class="operator">&gt;</span>points();
points <span class="operator">+</span><span class="operator">=</span> m_alpha_shade<span class="operator">-</span><span class="operator">&gt;</span>points();
<a href="qtalgorithms.html#qSort">qSort</a>(points<span class="operator">.</span>begin()<span class="operator">,</span> points<span class="operator">.</span>end()<span class="operator">,</span> x_less_than);
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator">&lt;</span>points<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> x <span class="operator">=</span> <span class="type">int</span>(points<span class="operator">.</span>at(i)<span class="operator">.</span>x());
<span class="keyword">if</span> (i<span class="operator">+</span><span class="number">1</span> <span class="operator">&lt;</span> points<span class="operator">.</span>size() <span class="operator">&amp;</span><span class="operator">&amp;</span> x <span class="operator">=</span><span class="operator">=</span> points<span class="operator">.</span>at(i<span class="operator">+</span><span class="number">1</span>)<span class="operator">.</span>x())
<span class="keyword">continue</span>;
<span class="type"><a href="qcolor.html">QColor</a></span> color((<span class="number">0x00ff0000</span> <span class="operator">&amp;</span> m_red_shade<span class="operator">-</span><span class="operator">&gt;</span>colorAt(<span class="type">int</span>(x))) <span class="operator">&gt;</span><span class="operator">&gt;</span> <span class="number">16</span><span class="operator">,</span>
(<span class="number">0x0000ff00</span> <span class="operator">&amp;</span> m_green_shade<span class="operator">-</span><span class="operator">&gt;</span>colorAt(<span class="type">int</span>(x))) <span class="operator">&gt;</span><span class="operator">&gt;</span> <span class="number">8</span><span class="operator">,</span>
(<span class="number">0x000000ff</span> <span class="operator">&amp;</span> m_blue_shade<span class="operator">-</span><span class="operator">&gt;</span>colorAt(<span class="type">int</span>(x)))<span class="operator">,</span>
(<span class="number">0xff000000</span> <span class="operator">&amp;</span> m_alpha_shade<span class="operator">-</span><span class="operator">&gt;</span>colorAt(<span class="type">int</span>(x))) <span class="operator">&gt;</span><span class="operator">&gt;</span> <span class="number">24</span>);
<span class="keyword">if</span> (x <span class="operator">/</span> w <span class="operator">&gt;</span> <span class="number">1</span>)
<span class="keyword">return</span>;
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(x <span class="operator">/</span> w<span class="operator">,</span> color);
}
m_alpha_shade<span class="operator">-</span><span class="operator">&gt;</span>setGradientStops(stops);
<span class="keyword">emit</span> gradientStopsChanged(stops);
}
<span class="keyword">static</span> <span class="type">void</span> set_shade_points(<span class="keyword">const</span> <span class="type"><a href="qpolygonf.html">QPolygonF</a></span> <span class="operator">&amp;</span>points<span class="operator">,</span> ShadeWidget <span class="operator">*</span>shade)
{
shade<span class="operator">-</span><span class="operator">&gt;</span>hoverPoints()<span class="operator">-</span><span class="operator">&gt;</span>setPoints(points);
shade<span class="operator">-</span><span class="operator">&gt;</span>hoverPoints()<span class="operator">-</span><span class="operator">&gt;</span>setPointLock(<span class="number">0</span><span class="operator">,</span> HoverPoints<span class="operator">::</span>LockToLeft);
shade<span class="operator">-</span><span class="operator">&gt;</span>hoverPoints()<span class="operator">-</span><span class="operator">&gt;</span>setPointLock(points<span class="operator">.</span>size() <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> HoverPoints<span class="operator">::</span>LockToRight);
shade<span class="operator">-</span><span class="operator">&gt;</span>update();
}
<span class="type">void</span> GradientEditor<span class="operator">::</span>setGradientStops(<span class="keyword">const</span> <span class="type"><a href="qgradient.html#QGradientStops-typedef">QGradientStops</a></span> <span class="operator">&amp;</span>stops)
{
<span class="type"><a href="qpolygonf.html">QPolygonF</a></span> pts_red<span class="operator">,</span> pts_green<span class="operator">,</span> pts_blue<span class="operator">,</span> pts_alpha;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> h_red <span class="operator">=</span> m_red_shade<span class="operator">-</span><span class="operator">&gt;</span>height();
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> h_green <span class="operator">=</span> m_green_shade<span class="operator">-</span><span class="operator">&gt;</span>height();
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> h_blue <span class="operator">=</span> m_blue_shade<span class="operator">-</span><span class="operator">&gt;</span>height();
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> h_alpha <span class="operator">=</span> m_alpha_shade<span class="operator">-</span><span class="operator">&gt;</span>height();
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator">&lt;</span>stops<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> pos <span class="operator">=</span> stops<span class="operator">.</span>at(i)<span class="operator">.</span>first;
<span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> color <span class="operator">=</span> stops<span class="operator">.</span>at(i)<span class="operator">.</span>second<span class="operator">.</span>rgba();
pts_red <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(pos <span class="operator">*</span> m_red_shade<span class="operator">-</span><span class="operator">&gt;</span>width()<span class="operator">,</span> h_red <span class="operator">-</span> <a href="qcolor.html#qRed">qRed</a>(color) <span class="operator">*</span> h_red <span class="operator">/</span> <span class="number">255</span>);
pts_green <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(pos <span class="operator">*</span> m_green_shade<span class="operator">-</span><span class="operator">&gt;</span>width()<span class="operator">,</span> h_green <span class="operator">-</span> <a href="qcolor.html#qGreen">qGreen</a>(color) <span class="operator">*</span> h_green <span class="operator">/</span> <span class="number">255</span>);
pts_blue <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(pos <span class="operator">*</span> m_blue_shade<span class="operator">-</span><span class="operator">&gt;</span>width()<span class="operator">,</span> h_blue <span class="operator">-</span> <a href="qcolor.html#qBlue">qBlue</a>(color) <span class="operator">*</span> h_blue <span class="operator">/</span> <span class="number">255</span>);
pts_alpha <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(pos <span class="operator">*</span> m_alpha_shade<span class="operator">-</span><span class="operator">&gt;</span>width()<span class="operator">,</span> h_alpha <span class="operator">-</span> <a href="qcolor.html#qAlpha">qAlpha</a>(color) <span class="operator">*</span> h_alpha <span class="operator">/</span> <span class="number">255</span>);
}
set_shade_points(pts_red<span class="operator">,</span> m_red_shade);
set_shade_points(pts_green<span class="operator">,</span> m_green_shade);
set_shade_points(pts_blue<span class="operator">,</span> m_blue_shade);
set_shade_points(pts_alpha<span class="operator">,</span> m_alpha_shade);
}
GradientWidget<span class="operator">::</span>GradientWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
{
setWindowTitle(tr(<span class="string">&quot;Gradients&quot;</span>));
m_renderer <span class="operator">=</span> <span class="keyword">new</span> GradientRenderer(<span class="keyword">this</span>);
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>mainGroup <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(<span class="keyword">this</span>);
mainGroup<span class="operator">-</span><span class="operator">&gt;</span>setTitle(tr(<span class="string">&quot;Gradients&quot;</span>));
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>editorGroup <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(mainGroup);
editorGroup<span class="operator">-</span><span class="operator">&gt;</span>setTitle(tr(<span class="string">&quot;Color Editor&quot;</span>));
m_editor <span class="operator">=</span> <span class="keyword">new</span> GradientEditor(editorGroup);
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>typeGroup <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(mainGroup);
typeGroup<span class="operator">-</span><span class="operator">&gt;</span>setTitle(tr(<span class="string">&quot;Gradient Type&quot;</span>));
m_linearButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qradiobutton.html">QRadioButton</a></span>(tr(<span class="string">&quot;Linear Gradient&quot;</span>)<span class="operator">,</span> typeGroup);
m_radialButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qradiobutton.html">QRadioButton</a></span>(tr(<span class="string">&quot;Radial Gradient&quot;</span>)<span class="operator">,</span> typeGroup);
m_conicalButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qradiobutton.html">QRadioButton</a></span>(tr(<span class="string">&quot;Conical Gradient&quot;</span>)<span class="operator">,</span> typeGroup);
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>spreadGroup <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(mainGroup);
spreadGroup<span class="operator">-</span><span class="operator">&gt;</span>setTitle(tr(<span class="string">&quot;Spread Method&quot;</span>));
m_padSpreadButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qradiobutton.html">QRadioButton</a></span>(tr(<span class="string">&quot;Pad Spread&quot;</span>)<span class="operator">,</span> spreadGroup);
m_reflectSpreadButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qradiobutton.html">QRadioButton</a></span>(tr(<span class="string">&quot;Reflect Spread&quot;</span>)<span class="operator">,</span> spreadGroup);
m_repeatSpreadButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qradiobutton.html">QRadioButton</a></span>(tr(<span class="string">&quot;Repeat Spread&quot;</span>)<span class="operator">,</span> spreadGroup);
<span class="type"><a href="qgroupbox.html">QGroupBox</a></span> <span class="operator">*</span>defaultsGroup <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(mainGroup);
defaultsGroup<span class="operator">-</span><span class="operator">&gt;</span>setTitle(tr(<span class="string">&quot;Defaults&quot;</span>));
<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>default1Button <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(tr(<span class="string">&quot;1&quot;</span>)<span class="operator">,</span> defaultsGroup);
<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>default2Button <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(tr(<span class="string">&quot;2&quot;</span>)<span class="operator">,</span> defaultsGroup);
<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>default3Button <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(tr(<span class="string">&quot;3&quot;</span>)<span class="operator">,</span> defaultsGroup);
<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>default4Button <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(tr(<span class="string">&quot;Reset&quot;</span>)<span class="operator">,</span> editorGroup);
<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>showSourceButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(mainGroup);
showSourceButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Show Source&quot;</span>));
<span class="preprocessor">#ifdef QT_OPENGL_SUPPORT</span>
<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>enableOpenGLButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(mainGroup);
enableOpenGLButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Use OpenGL&quot;</span>));
enableOpenGLButton<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
enableOpenGLButton<span class="operator">-</span><span class="operator">&gt;</span>setChecked(m_renderer<span class="operator">-</span><span class="operator">&gt;</span>usesOpenGL());
<span class="keyword">if</span> (<span class="operator">!</span><span class="type"><a href="qglformat.html">QGLFormat</a></span><span class="operator">::</span>hasOpenGL())
enableOpenGLButton<span class="operator">-</span><span class="operator">&gt;</span>hide();
<span class="preprocessor">#endif</span>
<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>whatsThisButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(mainGroup);
whatsThisButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;What's This?&quot;</span>));
whatsThisButton<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
<span class="comment">// Layouts</span>
<span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>(<span class="keyword">this</span>);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_renderer);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(mainGroup);
mainGroup<span class="operator">-</span><span class="operator">&gt;</span>setFixedWidth(<span class="number">180</span>);
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>mainGroupLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>(mainGroup);
mainGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(editorGroup);
mainGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(typeGroup);
mainGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(spreadGroup);
mainGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(defaultsGroup);
mainGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addStretch(<span class="number">1</span>);
mainGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(showSourceButton);
<span class="preprocessor">#ifdef QT_OPENGL_SUPPORT</span>
mainGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(enableOpenGLButton);
<span class="preprocessor">#endif</span>
mainGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(whatsThisButton);
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>editorGroupLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>(editorGroup);
editorGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_editor);
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>typeGroupLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>(typeGroup);
typeGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_linearButton);
typeGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_radialButton);
typeGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_conicalButton);
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>spreadGroupLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>(spreadGroup);
spreadGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_padSpreadButton);
spreadGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_repeatSpreadButton);
spreadGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_reflectSpreadButton);
<span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span> <span class="operator">*</span>defaultsGroupLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>(defaultsGroup);
defaultsGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(default1Button);
defaultsGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(default2Button);
defaultsGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(default3Button);
editorGroupLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(default4Button);
connect(m_editor<span class="operator">,</span> SIGNAL(gradientStopsChanged(<span class="type"><a href="qgradient.html#QGradientStops-typedef">QGradientStops</a></span>))<span class="operator">,</span>
m_renderer<span class="operator">,</span> SLOT(setGradientStops(<span class="type"><a href="qgradient.html#QGradientStops-typedef">QGradientStops</a></span>)));
connect(m_linearButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> m_renderer<span class="operator">,</span> SLOT(setLinearGradient()));
connect(m_radialButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> m_renderer<span class="operator">,</span> SLOT(setRadialGradient()));
connect(m_conicalButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> m_renderer<span class="operator">,</span> SLOT(setConicalGradient()));
connect(m_padSpreadButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> m_renderer<span class="operator">,</span> SLOT(setPadSpread()));
connect(m_reflectSpreadButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> m_renderer<span class="operator">,</span> SLOT(setReflectSpread()));
connect(m_repeatSpreadButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> m_renderer<span class="operator">,</span> SLOT(setRepeatSpread()));
connect(default1Button<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setDefault1()));
connect(default2Button<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setDefault2()));
connect(default3Button<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setDefault3()));
connect(default4Button<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setDefault4()));
connect(showSourceButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> m_renderer<span class="operator">,</span> SLOT(showSource()));
<span class="preprocessor">#ifdef QT_OPENGL_SUPPORT</span>
connect(enableOpenGLButton<span class="operator">,</span> SIGNAL(clicked(<span class="type">bool</span>))<span class="operator">,</span> m_renderer<span class="operator">,</span> SLOT(enableOpenGL(<span class="type">bool</span>)));
<span class="preprocessor">#endif</span>
connect(whatsThisButton<span class="operator">,</span> SIGNAL(clicked(<span class="type">bool</span>))<span class="operator">,</span> m_renderer<span class="operator">,</span> SLOT(setDescriptionEnabled(<span class="type">bool</span>)));
connect(whatsThisButton<span class="operator">,</span> SIGNAL(clicked(<span class="type">bool</span>))<span class="operator">,</span>
m_renderer<span class="operator">-</span><span class="operator">&gt;</span>hoverPoints()<span class="operator">,</span> SLOT(setDisabled(<span class="type">bool</span>)));
connect(m_renderer<span class="operator">,</span> SIGNAL(descriptionEnabledChanged(<span class="type">bool</span>))<span class="operator">,</span>
whatsThisButton<span class="operator">,</span> SLOT(setChecked(<span class="type">bool</span>)));
connect(m_renderer<span class="operator">,</span> SIGNAL(descriptionEnabledChanged(<span class="type">bool</span>))<span class="operator">,</span>
m_renderer<span class="operator">-</span><span class="operator">&gt;</span>hoverPoints()<span class="operator">,</span> SLOT(setDisabled(<span class="type">bool</span>)));
m_renderer<span class="operator">-</span><span class="operator">&gt;</span>loadSourceFile(<span class="string">&quot;:res/gradients/gradients.cpp&quot;</span>);
m_renderer<span class="operator">-</span><span class="operator">&gt;</span>loadDescription(<span class="string">&quot;:res/gradients/gradients.html&quot;</span>);
<span class="type"><a href="qtimer.html">QTimer</a></span><span class="operator">::</span>singleShot(<span class="number">50</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setDefault1()));
}
<span class="type">void</span> GradientWidget<span class="operator">::</span>setDefault(<span class="type">int</span> config)
{
<span class="type"><a href="qgradient.html#QGradientStops-typedef">QGradientStops</a></span> stops;
<span class="type"><a href="qpolygonf.html">QPolygonF</a></span> points;
<span class="keyword">switch</span> (config) {
<span class="keyword">case</span> <span class="number">1</span>:
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.00</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.04</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xff131360</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.08</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xff202ccc</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.42</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xff93d3f9</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.51</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xffb3e6ff</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.73</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xffffffec</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.92</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xff5353d9</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.96</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xff262666</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">1.00</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0</span>));
m_linearButton<span class="operator">-</span><span class="operator">&gt;</span>animateClick();
m_repeatSpreadButton<span class="operator">-</span><span class="operator">&gt;</span>animateClick();
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="number">2</span>:
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.00</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xffffffff</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.11</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xfff9ffa0</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.13</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xfff9ff99</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.14</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xfff3ff86</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.49</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xff93b353</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.87</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xff264619</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.96</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xff0c1306</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">1.00</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0</span>));
m_radialButton<span class="operator">-</span><span class="operator">&gt;</span>animateClick();
m_padSpreadButton<span class="operator">-</span><span class="operator">&gt;</span>animateClick();
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="number">3</span>:
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.00</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.10</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xffe0cc73</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.17</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xffc6a006</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.46</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xff600659</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.72</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xff0680ac</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.92</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xffb9d9e6</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">1.00</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0</span>));
m_conicalButton<span class="operator">-</span><span class="operator">&gt;</span>animateClick();
m_padSpreadButton<span class="operator">-</span><span class="operator">&gt;</span>animateClick();
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="number">4</span>:
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.00</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xff000000</span>));
stops <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">1.00</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromRgba(<span class="number">0xffffffff</span>));
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<a href="qtglobal.html#qWarning">qWarning</a>(<span class="string">&quot;bad default: %d\n&quot;</span><span class="operator">,</span> config);
<span class="keyword">break</span>;
}
<span class="type"><a href="qpolygonf.html">QPolygonF</a></span> pts;
<span class="type">int</span> h_off <span class="operator">=</span> m_renderer<span class="operator">-</span><span class="operator">&gt;</span>width() <span class="operator">/</span> <span class="number">10</span>;
<span class="type">int</span> v_off <span class="operator">=</span> m_renderer<span class="operator">-</span><span class="operator">&gt;</span>height() <span class="operator">/</span> <span class="number">8</span>;
pts <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(m_renderer<span class="operator">-</span><span class="operator">&gt;</span>width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> m_renderer<span class="operator">-</span><span class="operator">&gt;</span>height() <span class="operator">/</span> <span class="number">2</span>)
<span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(m_renderer<span class="operator">-</span><span class="operator">&gt;</span>width() <span class="operator">/</span> <span class="number">2</span> <span class="operator">-</span> h_off<span class="operator">,</span> m_renderer<span class="operator">-</span><span class="operator">&gt;</span>height() <span class="operator">/</span> <span class="number">2</span> <span class="operator">-</span> v_off);
m_editor<span class="operator">-</span><span class="operator">&gt;</span>setGradientStops(stops);
m_renderer<span class="operator">-</span><span class="operator">&gt;</span>hoverPoints()<span class="operator">-</span><span class="operator">&gt;</span>setPoints(pts);
m_renderer<span class="operator">-</span><span class="operator">&gt;</span>setGradientStops(stops);
}
GradientRenderer<span class="operator">::</span>GradientRenderer(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: ArthurFrame(parent)
{
m_hoverPoints <span class="operator">=</span> <span class="keyword">new</span> HoverPoints(<span class="keyword">this</span><span class="operator">,</span> HoverPoints<span class="operator">::</span>CircleShape);
m_hoverPoints<span class="operator">-</span><span class="operator">&gt;</span>setPointSize(<span class="type"><a href="qsize.html">QSize</a></span>(<span class="number">20</span><span class="operator">,</span> <span class="number">20</span>));
m_hoverPoints<span class="operator">-</span><span class="operator">&gt;</span>setConnectionType(HoverPoints<span class="operator">::</span>NoConnection);
m_hoverPoints<span class="operator">-</span><span class="operator">&gt;</span>setEditable(<span class="keyword">false</span>);
<span class="type"><a href="qvector.html">QVector</a></span><span class="operator">&lt;</span><span class="type"><a href="qpointf.html">QPointF</a></span><span class="operator">&gt;</span> points;
points <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(<span class="number">100</span><span class="operator">,</span> <span class="number">100</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(<span class="number">200</span><span class="operator">,</span> <span class="number">200</span>);
m_hoverPoints<span class="operator">-</span><span class="operator">&gt;</span>setPoints(points);
m_spread <span class="operator">=</span> <span class="type"><a href="qgradient.html">QGradient</a></span><span class="operator">::</span>PadSpread;
m_gradientType <span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LinearGradientPattern;
}
<span class="type">void</span> GradientRenderer<span class="operator">::</span>setGradientStops(<span class="keyword">const</span> <span class="type"><a href="qgradient.html#QGradientStops-typedef">QGradientStops</a></span> <span class="operator">&amp;</span>stops)
{
m_stops <span class="operator">=</span> stops;
update();
}
<span class="type">void</span> GradientRenderer<span class="operator">::</span>mousePressEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>)
{
setDescriptionEnabled(<span class="keyword">false</span>);
}
<span class="type">void</span> GradientRenderer<span class="operator">::</span>paint(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">*</span>p)
{
<span class="type"><a href="qpolygonf.html">QPolygonF</a></span> pts <span class="operator">=</span> m_hoverPoints<span class="operator">-</span><span class="operator">&gt;</span>points();
<span class="type"><a href="qgradient.html">QGradient</a></span> g;
<span class="keyword">if</span> (m_gradientType <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LinearGradientPattern) {
g <span class="operator">=</span> <span class="type"><a href="qlineargradient.html">QLinearGradient</a></span>(pts<span class="operator">.</span>at(<span class="number">0</span>)<span class="operator">,</span> pts<span class="operator">.</span>at(<span class="number">1</span>));
} <span class="keyword">else</span> <span class="keyword">if</span> (m_gradientType <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>RadialGradientPattern) {
g <span class="operator">=</span> <span class="type"><a href="qradialgradient.html">QRadialGradient</a></span>(pts<span class="operator">.</span>at(<span class="number">0</span>)<span class="operator">,</span> <a href="qtglobal.html#qMin">qMin</a>(width()<span class="operator">,</span> height()) <span class="operator">/</span> <span class="number">3.0</span><span class="operator">,</span> pts<span class="operator">.</span>at(<span class="number">1</span>));
} <span class="keyword">else</span> {
<span class="type"><a href="qlinef.html">QLineF</a></span> l(pts<span class="operator">.</span>at(<span class="number">0</span>)<span class="operator">,</span> pts<span class="operator">.</span>at(<span class="number">1</span>));
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> angle <span class="operator">=</span> l<span class="operator">.</span>angle(<span class="type"><a href="qlinef.html">QLineF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>));
<span class="keyword">if</span> (l<span class="operator">.</span>dy() <span class="operator">&gt;</span> <span class="number">0</span>)
angle <span class="operator">=</span> <span class="number">360</span> <span class="operator">-</span> angle;
g <span class="operator">=</span> <span class="type"><a href="qconicalgradient.html">QConicalGradient</a></span>(pts<span class="operator">.</span>at(<span class="number">0</span>)<span class="operator">,</span> angle);
}
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator">&lt;</span>m_stops<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i)
g<span class="operator">.</span>setColorAt(m_stops<span class="operator">.</span>at(i)<span class="operator">.</span>first<span class="operator">,</span> m_stops<span class="operator">.</span>at(i)<span class="operator">.</span>second);
g<span class="operator">.</span>setSpread(m_spread);
p<span class="operator">-</span><span class="operator">&gt;</span>setBrush(g);
p<span class="operator">-</span><span class="operator">&gt;</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoPen);
p<span class="operator">-</span><span class="operator">&gt;</span>drawRect(rect());
}</pre>
</div>
<!-- @@@demos/gradients/gradients.cpp -->
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