src/GradientRenderer.cpp

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#include "GradientRenderer.h"

GradientRenderer::GradientRenderer(QWidget *parent): QWidget(parent)
{
    printf("creating GradientRenderer\n");

//HACK: NOT EDITABLE - only show Gradient
//    m_hoverPoints = new HoverPoints(this, HoverPoints::CircleShape);
//    m_hoverPoints->setPointSize(QSize(0, 0));
//    m_hoverPoints->setConnectionType(HoverPoints::NoConnection);
//    m_hoverPoints->setEditable(false);
//
//    QVector<QPointF> points;
//    //points << QPointF(100, 100) << QPointF(200, 200);
//    points << QPointF(0, sizeHint().height()/2) << QPointF(sizeHint().width(), sizeHint().height()/2);
//    m_hoverPoints->setPoints(points);

    m_spread = QGradient::PadSpread;
    m_gradientType = Qt::LinearGradientPattern;
}

void GradientRenderer::paintEvent(QPaintEvent *event)
{
  QPainter painter;
  painter.begin(this);
    painter.setRenderHint(QPainter::Antialiasing);
    paint(&painter);
  painter.end();
}

void GradientRenderer::setGradientStops(const QGradientStops &stops)
{
    m_stops = stops;
    update();
}


void GradientRenderer::paint(QPainter *p)
{
    QPalette pal = palette(); 
    pal.setBrush( backgroundRole(), QBrush(QColor( Qt::black )) );
    setAutoFillBackground( true ); 
    setPalette( pal );
  
    QPolygonF pts;// = m_hoverPoints->points();

    // start and stop of gradient
    pts << QPointF(0.0, (float) rect().height() / 2) << QPointF((float) rect().width(), (float) rect().height() / 2);

    QGradient g;

    //if (m_gradientType == Qt::LinearGradientPattern) 
    //{
        g = QLinearGradient(pts.at(0), pts.at(1));
    //} 
    //else if (m_gradientType == Qt::RadialGradientPattern) 
    //{
    //    QLineF line(pts.at(0), pts.at(1));
    //    if (line.length() > 132)
    //        line.setLength(132);
    //    g = QRadialGradient(line.p1(), qMin(width(), height()) / 3.0, line.p2());
    //} else {
    //    QLineF l(pts.at(0), pts.at(1));
    //    double angle = l.angle(QLineF(0, 0, 1, 0));
    //    if (l.dy() > 0)
    //        angle = 360 - angle;
    //    g = QConicalGradient(pts.at(0), angle);
    //}

    for (int i=0; i<m_stops.size(); ++i)
    {
      g.setColorAt( m_stops.at(i).first, m_stops.at(i).second );
    }

    g.setSpread(m_spread);

    p->setBrush(g);
    p->setPen(Qt::NoPen);

    p->drawRect(rect());
}

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