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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">gradients.cpp Example File<br /><small><small>demos/gradients/gradients.cpp</small></small></h1>

<pre>  #include "gradients.h"

#include "hoverpoints.h"

ShadeWidget::ShadeWidget(ShadeType type, QWidget *parent)

: QWidget(parent), m_shade_type(type), m_alpha_gradient(QLinearGradient(0, 0, 0, 0))

{

// Checkers background

if (m_shade_type == ARGBShade) {

QPixmap pm(20, 20);

QPainter pmp(&pm);

pmp.fillRect(0, 0, 10, 10, Qt::lightGray);

pmp.fillRect(10, 10, 10, 10, Qt::lightGray);

pmp.fillRect(0, 10, 10, 10, Qt::darkGray);

pmp.fillRect(10, 0, 10, 10, Qt::darkGray);

pmp.end();

QPalette pal = palette();

pal.setBrush(backgroundRole(), QBrush(pm));

setPalette(pal);

} else {

setAttribute(Qt::WA_NoBackground);

}

QPolygonF points;

points << QPointF(0, sizeHint().height())

<< QPointF(sizeHint().width(), 0);

m_hoverPoints = new HoverPoints(this, HoverPoints::CircleShape);

// m_hoverPoints->setConnectionType(HoverPoints::LineConnection);

m_hoverPoints->setPoints(points);

m_hoverPoints->setPointLock(0, HoverPoints::LockToLeft);

m_hoverPoints->setPointLock(1, HoverPoints::LockToRight);

m_hoverPoints->setSortType(HoverPoints::XSort);

setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);

connect(m_hoverPoints, SIGNAL(pointsChanged(const QPolygonF &)), this, SIGNAL(colorsChanged()));

}

QPolygonF ShadeWidget::points() const

{

return m_hoverPoints->points();

}

uint ShadeWidget::colorAt(int x)

{

generateShade();

QPolygonF pts = m_hoverPoints->points();

for (int i=1; i < pts.size(); ++i) {

if (pts.at(i-1).x() <= x && pts.at(i).x() >= x) {

QLineF l(pts.at(i-1), pts.at(i));

l.setLength(l.length() * ((x - l.x1()) / l.dx()));

return m_shade.pixel(qRound(qMin(l.x2(), (double(m_shade.width() - 1)))),

qRound(qMin(l.y2(), double(m_shade.height() - 1))));

}

return 0;

}

void ShadeWidget::setGradientStops(const QGradientStops &stops)

{

if (m_shade_type == ARGBShade) {

m_alpha_gradient = QLinearGradient(0, 0, width(), 0);

for (int i=0; i<stops.size(); ++i) {

QColor c = stops.at(i).second;

m_alpha_gradient.setColorAt(stops.at(i).first, QColor(c.red(), c.green(), c.blue()));

}

m_shade = QImage();

generateShade();

update();

}

void ShadeWidget::paintEvent(QPaintEvent *)

{

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generateShade();

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QPainter p(this);

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p.drawImage(0, 0, m_shade);

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p.setPen(QColor(146, 146, 146));

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p.drawRect(0, 0, width() - 1, height() - 1);

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}

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void ShadeWidget::generateShade()

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{

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if (m_shade.isNull() || m_shade.size() != size()) {

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if (m_shade_type == ARGBShade) {

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m_shade = QImage(size(), QImage::Format_ARGB32_Premultiplied);

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m_shade.fill(0);

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QPainter p(&m_shade);

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p.fillRect(rect(), m_alpha_gradient);

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p.setCompositionMode(QPainter::CompositionMode_DestinationIn);

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QLinearGradient fade(0, 0, 0, height());

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fade.setColorAt(0, QColor(0, 0, 0, 255));

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fade.setColorAt(1, QColor(0, 0, 0, 0));

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p.fillRect(rect(), fade);

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} else {

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m_shade = QImage(size(), QImage::Format_RGB32);

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QLinearGradient shade(0, 0, 0, height());

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shade.setColorAt(1, Qt::black);

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if (m_shade_type == RedShade)

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shade.setColorAt(0, Qt::red);

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else if (m_shade_type == GreenShade)

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shade.setColorAt(0, Qt::green);

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else

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shade.setColorAt(0, Qt::blue);

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QPainter p(&m_shade);

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p.fillRect(rect(), shade);

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}

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}

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}

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GradientEditor::GradientEditor(QWidget *parent)

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: QWidget(parent)

147

{

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QVBoxLayout *vbox = new QVBoxLayout(this);

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vbox->setSpacing(1);

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vbox->setMargin(1);

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m_red_shade = new ShadeWidget(ShadeWidget::RedShade, this);

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m_green_shade = new ShadeWidget(ShadeWidget::GreenShade, this);

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m_blue_shade = new ShadeWidget(ShadeWidget::BlueShade, this);

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m_alpha_shade = new ShadeWidget(ShadeWidget::ARGBShade, this);

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vbox->addWidget(m_red_shade);

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vbox->addWidget(m_green_shade);

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vbox->addWidget(m_blue_shade);

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vbox->addWidget(m_alpha_shade);

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connect(m_red_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));

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connect(m_green_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));

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connect(m_blue_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));

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connect(m_alpha_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));

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}

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inline static bool x_less_than(const QPointF &p1, const QPointF &p2)

169

{

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return p1.x() < p2.x();

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}

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void GradientEditor::pointsUpdated()

174

{

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double w = m_alpha_shade->width();

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QGradientStops stops;

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QPolygonF points;

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points += m_red_shade->points();

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points += m_green_shade->points();

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points += m_blue_shade->points();

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points += m_alpha_shade->points();

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qSort(points.begin(), points.end(), x_less_than);

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for (int i=0; i<points.size(); ++i) {

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double x = int(points.at(i).x());

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if (i < points.size() - 1 && x == points.at(i+1).x())

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continue;

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QColor color((0x00ff0000 & m_red_shade->colorAt(int(x))) >> 16,

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(0x0000ff00 & m_green_shade->colorAt(int(x))) >> 8,

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(0x000000ff & m_blue_shade->colorAt(int(x))),

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(0xff000000 & m_alpha_shade->colorAt(int(x))) >> 24);

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if (x / w > 1)

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return;

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stops << QGradientStop(x / w, color);

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}

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m_alpha_shade->setGradientStops(stops);

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emit gradientStopsChanged(stops);

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}

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static void set_shade_points(const QPolygonF &points, ShadeWidget *shade)

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{

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shade->hoverPoints()->setPoints(points);

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shade->hoverPoints()->setPointLock(0, HoverPoints::LockToLeft);

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shade->hoverPoints()->setPointLock(points.size() - 1, HoverPoints::LockToRight);

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shade->update();

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}

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void GradientEditor::setGradientStops(const QGradientStops &stops)

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{

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QPolygonF pts_red, pts_green, pts_blue, pts_alpha;

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double h_red = m_red_shade->height();

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double h_green = m_green_shade->height();

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double h_blue = m_blue_shade->height();

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double h_alpha = m_alpha_shade->height();

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for (int i=0; i<stops.size(); ++i) {

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double pos = stops.at(i).first;

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QRgb color = stops.at(i).second.rgba();

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pts_red << QPointF(pos * m_red_shade->width(), h_red - qRed(color) * h_red / 255);

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pts_green << QPointF(pos * m_green_shade->width(), h_green - qGreen(color) * h_green / 255);

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pts_blue << QPointF(pos * m_blue_shade->width(), h_blue - qBlue(color) * h_blue / 255);

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pts_alpha << QPointF(pos * m_alpha_shade->width(), h_alpha - qAlpha(color) * h_alpha / 255);

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}

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set_shade_points(pts_red, m_red_shade);

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set_shade_points(pts_green, m_green_shade);

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set_shade_points(pts_blue, m_blue_shade);

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set_shade_points(pts_alpha, m_alpha_shade);

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}

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GradientWidget::GradientWidget(QWidget *parent)

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: QWidget(parent)

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{

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setWindowTitle("Gradients");

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m_renderer = new GradientRenderer(this);

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ArthurGroupBox *mainGroup = new ArthurGroupBox(this);

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mainGroup->setTitle("Gradients");

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ArthurGroupBox *editorGroup = new ArthurGroupBox(mainGroup);

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editorGroup->setAttribute(Qt::WA_ContentsPropagated);

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editorGroup->setTitle("Color Editor");

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m_editor = new GradientEditor(editorGroup);

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ArthurGroupBox *typeGroup = new ArthurGroupBox(mainGroup);

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typeGroup->setAttribute(Qt::WA_ContentsPropagated);

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typeGroup->setTitle("Gradient Type");

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m_linearButton = new QRadioButton("Linear Gradient", typeGroup);

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m_radialButton = new QRadioButton("Radial Gradient", typeGroup);

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m_conicalButton = new QRadioButton("Conical Gradient", typeGroup);

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ArthurGroupBox *spreadGroup = new ArthurGroupBox(mainGroup);

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spreadGroup->setAttribute(Qt::WA_ContentsPropagated);

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spreadGroup->setTitle("Spread Method");

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m_padSpreadButton = new QRadioButton("Pad Spread", spreadGroup);

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m_reflectSpreadButton = new QRadioButton("Reflect Spread", spreadGroup);

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m_repeatSpreadButton = new QRadioButton("Repeat Spread", spreadGroup);

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ArthurGroupBox *defaultsGroup = new ArthurGroupBox(mainGroup);

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defaultsGroup->setAttribute(Qt::WA_ContentsPropagated);

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defaultsGroup->setTitle("Defaults");

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QPushButton *default1Button = new QPushButton("1", defaultsGroup);

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QPushButton *default2Button = new QPushButton("2", defaultsGroup);

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QPushButton *default3Button = new QPushButton("3", defaultsGroup);

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QPushButton *default4Button = new QPushButton("Reset", editorGroup);

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QPushButton *showSourceButton = new QPushButton(mainGroup);

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showSourceButton->setText("Show Source");

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QPushButton *whatsThisButton = new QPushButton(mainGroup);

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whatsThisButton->setText("What's This?");

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whatsThisButton->setCheckable(true);

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// Layouts

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QHBoxLayout *mainLayout = new QHBoxLayout(this);

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mainLayout->addWidget(m_renderer);

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mainLayout->addWidget(mainGroup);

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mainGroup->setFixedWidth(180);

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QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);

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mainGroupLayout->addWidget(editorGroup);

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mainGroupLayout->addWidget(typeGroup);

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mainGroupLayout->addWidget(spreadGroup);

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mainGroupLayout->addWidget(defaultsGroup);

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mainGroupLayout->addStretch(1);

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mainGroupLayout->addWidget(showSourceButton);

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mainGroupLayout->addWidget(whatsThisButton);

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QVBoxLayout *editorGroupLayout = new QVBoxLayout(editorGroup);

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editorGroupLayout->addWidget(m_editor);

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QVBoxLayout *typeGroupLayout = new QVBoxLayout(typeGroup);

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typeGroupLayout->addWidget(m_linearButton);

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typeGroupLayout->addWidget(m_radialButton);

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typeGroupLayout->addWidget(m_conicalButton);

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QVBoxLayout *spreadGroupLayout = new QVBoxLayout(spreadGroup);

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spreadGroupLayout->addWidget(m_padSpreadButton);

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spreadGroupLayout->addWidget(m_repeatSpreadButton);

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spreadGroupLayout->addWidget(m_reflectSpreadButton);

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QHBoxLayout *defaultsGroupLayout = new QHBoxLayout(defaultsGroup);

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defaultsGroupLayout->addWidget(default1Button);

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defaultsGroupLayout->addWidget(default2Button);

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defaultsGroupLayout->addWidget(default3Button);

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editorGroupLayout->addWidget(default4Button);

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connect(m_editor, SIGNAL(gradientStopsChanged(const QGradientStops &)),

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m_renderer, SLOT(setGradientStops(const QGradientStops &)));

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connect(m_linearButton, SIGNAL(clicked()), m_renderer, SLOT(setLinearGradient()));

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connect(m_radialButton, SIGNAL(clicked()), m_renderer, SLOT(setRadialGradient()));

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connect(m_conicalButton, SIGNAL(clicked()), m_renderer, SLOT(setConicalGradient()));

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connect(m_padSpreadButton, SIGNAL(clicked()), m_renderer, SLOT(setPadSpread()));

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connect(m_reflectSpreadButton, SIGNAL(clicked()), m_renderer, SLOT(setReflectSpread()));

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connect(m_repeatSpreadButton, SIGNAL(clicked()), m_renderer, SLOT(setRepeatSpread()));

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connect(default1Button, SIGNAL(clicked()), this, SLOT(setDefault1()));

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connect(default2Button, SIGNAL(clicked()), this, SLOT(setDefault2()));

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connect(default3Button, SIGNAL(clicked()), this, SLOT(setDefault3()));

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connect(default4Button, SIGNAL(clicked()), this, SLOT(setDefault4()));

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connect(showSourceButton, SIGNAL(clicked()), m_renderer, SLOT(showSource()));

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connect(whatsThisButton, SIGNAL(clicked(bool)), m_renderer, SLOT(setDescriptionEnabled(bool)));

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connect(whatsThisButton, SIGNAL(clicked(bool)),

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m_renderer->hoverPoints(), SLOT(setDisabled(bool)));

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connect(m_renderer, SIGNAL(descriptionEnabledChanged(bool)),

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whatsThisButton, SLOT(setChecked(bool)));

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connect(m_renderer, SIGNAL(descriptionEnabledChanged(bool)),

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m_renderer->hoverPoints(), SLOT(setDisabled(bool)));

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

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

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

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}

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void GradientWidget::setDefault(int config)

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{

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QGradientStops stops;

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QPolygonF points;

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switch (config) {

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case 1:

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stops << QGradientStop(0.00, QColor::fromRgba(0));

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stops << QGradientStop(0.04, QColor::fromRgba(0xff131360));

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stops << QGradientStop(0.08, QColor::fromRgba(0xff202ccc));

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stops << QGradientStop(0.42, QColor::fromRgba(0xff93d3f9));

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stops << QGradientStop(0.51, QColor::fromRgba(0xffb3e6ff));

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stops << QGradientStop(0.73, QColor::fromRgba(0xffffffec));

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stops << QGradientStop(0.92, QColor::fromRgba(0xff5353d9));

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stops << QGradientStop(0.96, QColor::fromRgba(0xff262666));

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stops << QGradientStop(1.00, QColor::fromRgba(0));

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m_linearButton->animateClick();

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m_repeatSpreadButton->animateClick();

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break;

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case 2:

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stops << QGradientStop(0.00, QColor::fromRgba(0xffffffff));

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stops << QGradientStop(0.11, QColor::fromRgba(0xfff9ffa0));

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stops << QGradientStop(0.13, QColor::fromRgba(0xfff9ff99));

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stops << QGradientStop(0.14, QColor::fromRgba(0xfff3ff86));

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stops << QGradientStop(0.49, QColor::fromRgba(0xff93b353));

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stops << QGradientStop(0.87, QColor::fromRgba(0xff264619));

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stops << QGradientStop(0.96, QColor::fromRgba(0xff0c1306));

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stops << QGradientStop(1.00, QColor::fromRgba(0));

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m_radialButton->animateClick();

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m_padSpreadButton->animateClick();

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break;

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case 3:

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stops << QGradientStop(0.00, QColor::fromRgba(0));

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stops << QGradientStop(0.10, QColor::fromRgba(0xffe0cc73));

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stops << QGradientStop(0.17, QColor::fromRgba(0xffc6a006));

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stops << QGradientStop(0.46, QColor::fromRgba(0xff600659));

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stops << QGradientStop(0.72, QColor::fromRgba(0xff0680ac));

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stops << QGradientStop(0.92, QColor::fromRgba(0xffb9d9e6));

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stops << QGradientStop(1.00, QColor::fromRgba(0));

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m_conicalButton->animateClick();

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m_padSpreadButton->animateClick();

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break;

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case 4:

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stops << QGradientStop(0.00, QColor::fromRgba(0xff000000));

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stops << QGradientStop(1.00, QColor::fromRgba(0xffffffff));

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break;

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400

default:

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

402

break;

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}

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QPolygonF pts;

406

int h_off = m_renderer->width() / 10;

407

int v_off = m_renderer->height() / 8;

408

pts << QPointF(m_renderer->width() / 2, m_renderer->height() / 2)

409

<< QPointF(m_renderer->width() / 2 - h_off, m_renderer->height() / 2 - v_off);

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m_editor->setGradientStops(stops);

412

m_renderer->hoverPoints()->setPoints(pts);

413

m_renderer->setGradientStops(stops);

414

}

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GradientRenderer::GradientRenderer(QWidget *parent)

417

: ArthurFrame(parent)

418

{

419

m_hoverPoints = new HoverPoints(this, HoverPoints::CircleShape);

420

m_hoverPoints->setPointSize(QSize(20, 20));

421

m_hoverPoints->setConnectionType(HoverPoints::NoConnection);

422

m_hoverPoints->setEditable(false);

423

424

QVector<QPointF> points;

425

points << QPointF(100, 100) << QPointF(200, 200);

426

m_hoverPoints->setPoints(points);

427

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m_spread = QGradient::PadSpread;

429

m_gradientType = Qt::LinearGradientPattern;

430

}

431

432

void GradientRenderer::setGradientStops(const QGradientStops &stops)

433

{

434

m_stops = stops;

435

update();

436

}

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438

void GradientRenderer::mousePressEvent(QMouseEvent *)

439

{

440

setDescriptionEnabled(false);

441

}

442

443

void GradientRenderer::paint(QPainter *p)

444

{

445

QPolygonF pts = m_hoverPoints->points();

446

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QGradient g;

448

449

if (m_gradientType == Qt::LinearGradientPattern) {

450

g = QLinearGradient(pts.at(0), pts.at(1));

451

452

} else if (m_gradientType == Qt::RadialGradientPattern) {

453

g = QRadialGradient(pts.at(0), qMin(width(), height()) / 3.0, pts.at(1));

454

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} else {

456

QLineF l(pts.at(0), pts.at(1));

457

double angle = l.angle(QLineF(0, 0, 1, 0));

458

if (l.dy() > 0)

459

angle = 360 - angle;

460

g = QConicalGradient(pts.at(0), angle);

461

}

462

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for (int i=0; i<m_stops.size(); ++i)

464

g.setColorAt(m_stops.at(i).first, m_stops.at(i).second);

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g.setSpread(m_spread);

467

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p->setBrush(g);

469

p->setPen(Qt::NoPen);

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p->drawRect(rect());

472

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}</pre>

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