--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/demos/gradients/gradients.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,516 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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));
+ setAutoFillBackground(true);
+ 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(), (qreal(m_shade.width() - 1)))),
+ qRound(qMin(l.y2(), qreal(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 *)
+{
+ generateShade();
+
+ QPainter p(this);
+ p.drawImage(0, 0, m_shade);
+
+ p.setPen(QColor(146, 146, 146));
+ p.drawRect(0, 0, width() - 1, height() - 1);
+}
+
+
+void ShadeWidget::generateShade()
+{
+ if (m_shade.isNull() || m_shade.size() != size()) {
+
+ if (m_shade_type == ARGBShade) {
+ m_shade = QImage(size(), QImage::Format_ARGB32_Premultiplied);
+ m_shade.fill(0);
+
+ QPainter p(&m_shade);
+ p.fillRect(rect(), m_alpha_gradient);
+
+ p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
+ QLinearGradient fade(0, 0, 0, height());
+ fade.setColorAt(0, QColor(0, 0, 0, 255));
+ fade.setColorAt(1, QColor(0, 0, 0, 0));
+ p.fillRect(rect(), fade);
+
+ } else {
+ m_shade = QImage(size(), QImage::Format_RGB32);
+ QLinearGradient shade(0, 0, 0, height());
+ shade.setColorAt(1, Qt::black);
+
+ if (m_shade_type == RedShade)
+ shade.setColorAt(0, Qt::red);
+ else if (m_shade_type == GreenShade)
+ shade.setColorAt(0, Qt::green);
+ else
+ shade.setColorAt(0, Qt::blue);
+
+ QPainter p(&m_shade);
+ p.fillRect(rect(), shade);
+ }
+ }
+
+
+}
+
+
+GradientEditor::GradientEditor(QWidget *parent)
+ : QWidget(parent)
+{
+ QVBoxLayout *vbox = new QVBoxLayout(this);
+ vbox->setSpacing(1);
+ vbox->setMargin(1);
+
+ m_red_shade = new ShadeWidget(ShadeWidget::RedShade, this);
+ m_green_shade = new ShadeWidget(ShadeWidget::GreenShade, this);
+ m_blue_shade = new ShadeWidget(ShadeWidget::BlueShade, this);
+ m_alpha_shade = new ShadeWidget(ShadeWidget::ARGBShade, this);
+
+ vbox->addWidget(m_red_shade);
+ vbox->addWidget(m_green_shade);
+ vbox->addWidget(m_blue_shade);
+ vbox->addWidget(m_alpha_shade);
+
+ connect(m_red_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));
+ connect(m_green_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));
+ connect(m_blue_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));
+ connect(m_alpha_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));
+}
+
+
+inline static bool x_less_than(const QPointF &p1, const QPointF &p2)
+{
+ return p1.x() < p2.x();
+}
+
+
+void GradientEditor::pointsUpdated()
+{
+ qreal w = m_alpha_shade->width();
+
+ QGradientStops stops;
+
+ QPolygonF points;
+
+ points += m_red_shade->points();
+ points += m_green_shade->points();
+ points += m_blue_shade->points();
+ points += m_alpha_shade->points();
+
+ qSort(points.begin(), points.end(), x_less_than);
+
+ for (int i=0; i<points.size(); ++i) {
+ qreal x = int(points.at(i).x());
+ if (i < points.size() - 1 && x == points.at(i+1).x())
+ continue;
+ QColor color((0x00ff0000 & m_red_shade->colorAt(int(x))) >> 16,
+ (0x0000ff00 & m_green_shade->colorAt(int(x))) >> 8,
+ (0x000000ff & m_blue_shade->colorAt(int(x))),
+ (0xff000000 & m_alpha_shade->colorAt(int(x))) >> 24);
+
+ if (x / w > 1)
+ return;
+
+ stops << QGradientStop(x / w, color);
+ }
+
+ m_alpha_shade->setGradientStops(stops);
+
+ emit gradientStopsChanged(stops);
+}
+
+
+static void set_shade_points(const QPolygonF &points, ShadeWidget *shade)
+{
+ shade->hoverPoints()->setPoints(points);
+ shade->hoverPoints()->setPointLock(0, HoverPoints::LockToLeft);
+ shade->hoverPoints()->setPointLock(points.size() - 1, HoverPoints::LockToRight);
+ shade->update();
+}
+
+void GradientEditor::setGradientStops(const QGradientStops &stops)
+{
+ QPolygonF pts_red, pts_green, pts_blue, pts_alpha;
+
+ qreal h_red = m_red_shade->height();
+ qreal h_green = m_green_shade->height();
+ qreal h_blue = m_blue_shade->height();
+ qreal h_alpha = m_alpha_shade->height();
+
+ for (int i=0; i<stops.size(); ++i) {
+ qreal pos = stops.at(i).first;
+ QRgb color = stops.at(i).second.rgba();
+ pts_red << QPointF(pos * m_red_shade->width(), h_red - qRed(color) * h_red / 255);
+ pts_green << QPointF(pos * m_green_shade->width(), h_green - qGreen(color) * h_green / 255);
+ pts_blue << QPointF(pos * m_blue_shade->width(), h_blue - qBlue(color) * h_blue / 255);
+ pts_alpha << QPointF(pos * m_alpha_shade->width(), h_alpha - qAlpha(color) * h_alpha / 255);
+ }
+
+ 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(tr("Gradients"));
+
+ m_renderer = new GradientRenderer(this);
+
+ QGroupBox *mainGroup = new QGroupBox(this);
+ mainGroup->setTitle(tr("Gradients"));
+
+ QGroupBox *editorGroup = new QGroupBox(mainGroup);
+ editorGroup->setTitle(tr("Color Editor"));
+ m_editor = new GradientEditor(editorGroup);
+
+ QGroupBox *typeGroup = new QGroupBox(mainGroup);
+ typeGroup->setTitle(tr("Gradient Type"));
+ m_linearButton = new QRadioButton(tr("Linear Gradient"), typeGroup);
+ m_radialButton = new QRadioButton(tr("Radial Gradient"), typeGroup);
+ m_conicalButton = new QRadioButton(tr("Conical Gradient"), typeGroup);
+
+ QGroupBox *spreadGroup = new QGroupBox(mainGroup);
+ spreadGroup->setTitle(tr("Spread Method"));
+ m_padSpreadButton = new QRadioButton(tr("Pad Spread"), spreadGroup);
+ m_reflectSpreadButton = new QRadioButton(tr("Reflect Spread"), spreadGroup);
+ m_repeatSpreadButton = new QRadioButton(tr("Repeat Spread"), spreadGroup);
+
+ QGroupBox *defaultsGroup = new QGroupBox(mainGroup);
+ defaultsGroup->setTitle(tr("Defaults"));
+ QPushButton *default1Button = new QPushButton(tr("1"), defaultsGroup);
+ QPushButton *default2Button = new QPushButton(tr("2"), defaultsGroup);
+ QPushButton *default3Button = new QPushButton(tr("3"), defaultsGroup);
+ QPushButton *default4Button = new QPushButton(tr("Reset"), editorGroup);
+
+ QPushButton *showSourceButton = new QPushButton(mainGroup);
+ showSourceButton->setText(tr("Show Source"));
+#ifdef QT_OPENGL_SUPPORT
+ QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
+ enableOpenGLButton->setText(tr("Use OpenGL"));
+ enableOpenGLButton->setCheckable(true);
+ enableOpenGLButton->setChecked(m_renderer->usesOpenGL());
+ if (!QGLFormat::hasOpenGL())
+ enableOpenGLButton->hide();
+#endif
+ QPushButton *whatsThisButton = new QPushButton(mainGroup);
+ whatsThisButton->setText(tr("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/gradients.cpp");
+ m_renderer->loadDescription(":res/gradients/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) {
+ g = QRadialGradient(pts.at(0), qMin(width(), height()) / 3.0, pts.at(1));
+
+ } else {
+ QLineF l(pts.at(0), pts.at(1));
+ qreal 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());
+
+}