gradients.cpp

奇趣公司比较新的qt/emd版本

    }

    set_shade_points(pts_red, m_red_shade);
    set_shade_points(pts_green, m_green_shade);
    set_shade_points(pts_blue, m_blue_shade);
    set_shade_points(pts_alpha, m_alpha_shade);

}

GradientWidget::GradientWidget(QWidget *parent)
    : QWidget(parent)
{
    setWindowTitle("Gradients");

    m_renderer = new GradientRenderer(this);

    QGroupBox *mainGroup = new QGroupBox(this);
    mainGroup->setTitle("Gradients");

    QGroupBox *editorGroup = new QGroupBox(mainGroup);
    editorGroup->setAttribute(Qt::WA_ContentsPropagated);
    editorGroup->setTitle("Color Editor");
    m_editor = new GradientEditor(editorGroup);

    QGroupBox *typeGroup = new QGroupBox(mainGroup);
    typeGroup->setAttribute(Qt::WA_ContentsPropagated);
    typeGroup->setTitle("Gradient Type");
    m_linearButton = new QRadioButton("Linear Gradient", typeGroup);
    m_radialButton = new QRadioButton("Radial Gradient", typeGroup);
    m_conicalButton = new QRadioButton("Conical Gradient", typeGroup);

    QGroupBox *spreadGroup = new QGroupBox(mainGroup);
    spreadGroup->setAttribute(Qt::WA_ContentsPropagated);
    spreadGroup->setTitle("Spread Method");
    m_padSpreadButton = new QRadioButton("Pad Spread", spreadGroup);
    m_reflectSpreadButton = new QRadioButton("Reflect Spread", spreadGroup);
    m_repeatSpreadButton = new QRadioButton("Repeat Spread", spreadGroup);

    QGroupBox *defaultsGroup = new QGroupBox(mainGroup);
    defaultsGroup->setAttribute(Qt::WA_ContentsPropagated);
    defaultsGroup->setTitle("Defaults");
    QPushButton *default1Button = new QPushButton("1", defaultsGroup);
    QPushButton *default2Button = new QPushButton("2", defaultsGroup);
    QPushButton *default3Button = new QPushButton("3", defaultsGroup);
    QPushButton *default4Button = new QPushButton("Reset", editorGroup);

    QPushButton *showSourceButton = new QPushButton(mainGroup);
    showSourceButton->setText("Show Source");
#ifdef QT_OPENGL_SUPPORT
    QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
    enableOpenGLButton->setText("Use OpenGL");
    enableOpenGLButton->setCheckable(true);
    enableOpenGLButton->setChecked(m_renderer->usesOpenGL());
    if (!QGLFormat::hasOpenGL())
        enableOpenGLButton->hide();
#endif
    QPushButton *whatsThisButton = new QPushButton(mainGroup);
    whatsThisButton->setText("What's This?");
    whatsThisButton->setCheckable(true);

    // Layouts
    QHBoxLayout *mainLayout = new QHBoxLayout(this);
    mainLayout->addWidget(m_renderer);
    mainLayout->addWidget(mainGroup);

    mainGroup->setFixedWidth(180);
    QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);
    mainGroupLayout->addWidget(editorGroup);
    mainGroupLayout->addWidget(typeGroup);
    mainGroupLayout->addWidget(spreadGroup);
    mainGroupLayout->addWidget(defaultsGroup);
    mainGroupLayout->addStretch(1);
    mainGroupLayout->addWidget(showSourceButton);
#ifdef QT_OPENGL_SUPPORT
    mainGroupLayout->addWidget(enableOpenGLButton);
#endif
    mainGroupLayout->addWidget(whatsThisButton);

    QVBoxLayout *editorGroupLayout = new QVBoxLayout(editorGroup);
    editorGroupLayout->addWidget(m_editor);

    QVBoxLayout *typeGroupLayout = new QVBoxLayout(typeGroup);
    typeGroupLayout->addWidget(m_linearButton);
    typeGroupLayout->addWidget(m_radialButton);
    typeGroupLayout->addWidget(m_conicalButton);

    QVBoxLayout *spreadGroupLayout = new QVBoxLayout(spreadGroup);
    spreadGroupLayout->addWidget(m_padSpreadButton);
    spreadGroupLayout->addWidget(m_repeatSpreadButton);
    spreadGroupLayout->addWidget(m_reflectSpreadButton);

    QHBoxLayout *defaultsGroupLayout = new QHBoxLayout(defaultsGroup);
    defaultsGroupLayout->addWidget(default1Button);
    defaultsGroupLayout->addWidget(default2Button);
    defaultsGroupLayout->addWidget(default3Button);
    editorGroupLayout->addWidget(default4Button);

    connect(m_editor, SIGNAL(gradientStopsChanged(const QGradientStops &)),
            m_renderer, SLOT(setGradientStops(const QGradientStops &)));

    connect(m_linearButton, SIGNAL(clicked()), m_renderer, SLOT(setLinearGradient()));
    connect(m_radialButton, SIGNAL(clicked()), m_renderer, SLOT(setRadialGradient()));
    connect(m_conicalButton, SIGNAL(clicked()), m_renderer, SLOT(setConicalGradient()));

    connect(m_padSpreadButton, SIGNAL(clicked()), m_renderer, SLOT(setPadSpread()));
    connect(m_reflectSpreadButton, SIGNAL(clicked()), m_renderer, SLOT(setReflectSpread()));
    connect(m_repeatSpreadButton, SIGNAL(clicked()), m_renderer, SLOT(setRepeatSpread()));

    connect(default1Button, SIGNAL(clicked()), this, SLOT(setDefault1()));
    connect(default2Button, SIGNAL(clicked()), this, SLOT(setDefault2()));
    connect(default3Button, SIGNAL(clicked()), this, SLOT(setDefault3()));
    connect(default4Button, SIGNAL(clicked()), this, SLOT(setDefault4()));

    connect(showSourceButton, SIGNAL(clicked()), m_renderer, SLOT(showSource()));
#ifdef QT_OPENGL_SUPPORT
    connect(enableOpenGLButton, SIGNAL(clicked(bool)), m_renderer, SLOT(enableOpenGL(bool)));
#endif
    connect(whatsThisButton, SIGNAL(clicked(bool)), m_renderer, SLOT(setDescriptionEnabled(bool)));
    connect(whatsThisButton, SIGNAL(clicked(bool)),
            m_renderer->hoverPoints(), SLOT(setDisabled(bool)));
    connect(m_renderer, SIGNAL(descriptionEnabledChanged(bool)),
            whatsThisButton, SLOT(setChecked(bool)));
    connect(m_renderer, SIGNAL(descriptionEnabledChanged(bool)),
            m_renderer->hoverPoints(), SLOT(setDisabled(bool)));

    m_renderer->loadSourceFile(":res/gradients.cpp");
    m_renderer->loadDescription(":res/gradients.html");

    QTimer::singleShot(50, this, SLOT(setDefault1()));
}

void GradientWidget::setDefault(int config)
{
    QGradientStops stops;
    QPolygonF points;
    switch (config) {
    case 1:
        stops << QGradientStop(0.00, QColor::fromRgba(0));
        stops << QGradientStop(0.04, QColor::fromRgba(0xff131360));
        stops << QGradientStop(0.08, QColor::fromRgba(0xff202ccc));
        stops << QGradientStop(0.42, QColor::fromRgba(0xff93d3f9));
        stops << QGradientStop(0.51, QColor::fromRgba(0xffb3e6ff));
        stops << QGradientStop(0.73, QColor::fromRgba(0xffffffec));
        stops << QGradientStop(0.92, QColor::fromRgba(0xff5353d9));
        stops << QGradientStop(0.96, QColor::fromRgba(0xff262666));
        stops << QGradientStop(1.00, QColor::fromRgba(0));
        m_linearButton->animateClick();
        m_repeatSpreadButton->animateClick();
        break;

    case 2:
        stops << QGradientStop(0.00, QColor::fromRgba(0xffffffff));
        stops << QGradientStop(0.11, QColor::fromRgba(0xfff9ffa0));
        stops << QGradientStop(0.13, QColor::fromRgba(0xfff9ff99));
        stops << QGradientStop(0.14, QColor::fromRgba(0xfff3ff86));
        stops << QGradientStop(0.49, QColor::fromRgba(0xff93b353));
        stops << QGradientStop(0.87, QColor::fromRgba(0xff264619));
        stops << QGradientStop(0.96, QColor::fromRgba(0xff0c1306));
        stops << QGradientStop(1.00, QColor::fromRgba(0));
        m_radialButton->animateClick();
        m_padSpreadButton->animateClick();
        break;

    case 3:
        stops << QGradientStop(0.00, QColor::fromRgba(0));
        stops << QGradientStop(0.10, QColor::fromRgba(0xffe0cc73));
        stops << QGradientStop(0.17, QColor::fromRgba(0xffc6a006));
        stops << QGradientStop(0.46, QColor::fromRgba(0xff600659));
        stops << QGradientStop(0.72, QColor::fromRgba(0xff0680ac));
        stops << QGradientStop(0.92, QColor::fromRgba(0xffb9d9e6));
        stops << QGradientStop(1.00, QColor::fromRgba(0));
        m_conicalButton->animateClick();
        m_padSpreadButton->animateClick();
        break;

    case 4:
        stops << QGradientStop(0.00, QColor::fromRgba(0xff000000));
        stops << QGradientStop(1.00, QColor::fromRgba(0xffffffff));
        break;

    default:
        qWarning("bad default: %d\n", config);
        break;
    }

    QPolygonF pts;
    int h_off = m_renderer->width() / 10;
    int v_off = m_renderer->height() / 8;
    pts << QPointF(m_renderer->width() / 2, m_renderer->height() / 2)
        << QPointF(m_renderer->width() / 2 - h_off, m_renderer->height() / 2 - v_off);

    m_editor->setGradientStops(stops);
    m_renderer->hoverPoints()->setPoints(pts);
    m_renderer->setGradientStops(stops);
}


GradientRenderer::GradientRenderer(QWidget *parent)
    : ArthurFrame(parent)
{
    m_hoverPoints = new HoverPoints(this, HoverPoints::CircleShape);
    m_hoverPoints->setPointSize(QSize(20, 20));
    m_hoverPoints->setConnectionType(HoverPoints::NoConnection);
    m_hoverPoints->setEditable(false);

    QVector<QPointF> points;
    points << QPointF(100, 100) << QPointF(200, 200);
    m_hoverPoints->setPoints(points);

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

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


void GradientRenderer::mousePressEvent(QMouseEvent *)
{
    setDescriptionEnabled(false);
}

void GradientRenderer::paint(QPainter *p)
{
    QPolygonF pts = m_hoverPoints->points();

    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());

}