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**
** Copyright (C) 2010 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.
**
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** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
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** packaging of this file. Please review the following information to
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** rights. These rights are described in the Nokia Qt 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
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** packaging of this file. Please review the following information to
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#include "pathdeform.h"
#include <QApplication>
#include <QtDebug>
#include <QMouseEvent>
#include <QTimerEvent>
#include <QLayout>
#include <QLineEdit>
#include <QPainter>
#include <QSlider>
#include <QLabel>
#include <QDesktopWidget>
#include <qmath.h>
PathDeformControls::PathDeformControls(QWidget *parent, PathDeformRenderer* renderer, bool smallScreen)
: QWidget(parent)
{
m_renderer = renderer;
if (smallScreen)
layoutForSmallScreen();
else
layoutForDesktop();
}
void PathDeformControls::layoutForDesktop()
{
QGroupBox* mainGroup = new QGroupBox(this);
mainGroup->setTitle(tr("Controls"));
QGroupBox *radiusGroup = new QGroupBox(mainGroup);
radiusGroup->setTitle(tr("Lens Radius"));
QSlider *radiusSlider = new QSlider(Qt::Horizontal, radiusGroup);
radiusSlider->setRange(15, 150);
radiusSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
QGroupBox *deformGroup = new QGroupBox(mainGroup);
deformGroup->setTitle(tr("Deformation"));
QSlider *deformSlider = new QSlider(Qt::Horizontal, deformGroup);
deformSlider->setRange(-100, 100);
deformSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
QGroupBox *fontSizeGroup = new QGroupBox(mainGroup);
fontSizeGroup->setTitle(tr("Font Size"));
QSlider *fontSizeSlider = new QSlider(Qt::Horizontal, fontSizeGroup);
fontSizeSlider->setRange(16, 200);
fontSizeSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
QGroupBox *textGroup = new QGroupBox(mainGroup);
textGroup->setTitle(tr("Text"));
QLineEdit *textInput = new QLineEdit(textGroup);
QPushButton *animateButton = new QPushButton(mainGroup);
animateButton->setText(tr("Animated"));
animateButton->setCheckable(true);
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);
mainGroup->setFixedWidth(180);
QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);
mainGroupLayout->addWidget(radiusGroup);
mainGroupLayout->addWidget(deformGroup);
mainGroupLayout->addWidget(fontSizeGroup);
mainGroupLayout->addWidget(textGroup);
mainGroupLayout->addWidget(animateButton);
mainGroupLayout->addStretch(1);
#ifdef QT_OPENGL_SUPPORT
mainGroupLayout->addWidget(enableOpenGLButton);
#endif
mainGroupLayout->addWidget(showSourceButton);
mainGroupLayout->addWidget(whatsThisButton);
QVBoxLayout *radiusGroupLayout = new QVBoxLayout(radiusGroup);
radiusGroupLayout->addWidget(radiusSlider);
QVBoxLayout *deformGroupLayout = new QVBoxLayout(deformGroup);
deformGroupLayout->addWidget(deformSlider);
QVBoxLayout *fontSizeGroupLayout = new QVBoxLayout(fontSizeGroup);
fontSizeGroupLayout->addWidget(fontSizeSlider);
QVBoxLayout *textGroupLayout = new QVBoxLayout(textGroup);
textGroupLayout->addWidget(textInput);
QVBoxLayout * mainLayout = new QVBoxLayout(this);
mainLayout->addWidget(mainGroup);
mainLayout->setMargin(0);
connect(radiusSlider, SIGNAL(valueChanged(int)), m_renderer, SLOT(setRadius(int)));
connect(deformSlider, SIGNAL(valueChanged(int)), m_renderer, SLOT(setIntensity(int)));
connect(fontSizeSlider, SIGNAL(valueChanged(int)), m_renderer, SLOT(setFontSize(int)));
connect(animateButton, SIGNAL(clicked(bool)), m_renderer, SLOT(setAnimated(bool)));
#ifdef QT_OPENGL_SUPPORT
connect(enableOpenGLButton, SIGNAL(clicked(bool)), m_renderer, SLOT(enableOpenGL(bool)));
#endif
connect(textInput, SIGNAL(textChanged(QString)), m_renderer, SLOT(setText(QString)));
connect(m_renderer, SIGNAL(descriptionEnabledChanged(bool)),
whatsThisButton, SLOT(setChecked(bool)));
connect(whatsThisButton, SIGNAL(clicked(bool)), m_renderer, SLOT(setDescriptionEnabled(bool)));
connect(showSourceButton, SIGNAL(clicked()), m_renderer, SLOT(showSource()));
animateButton->animateClick();
deformSlider->setValue(80);
fontSizeSlider->setValue(120);
radiusSlider->setValue(100);
textInput->setText(tr("Qt"));
}
void PathDeformControls::layoutForSmallScreen()
{
QGroupBox* mainGroup = new QGroupBox(this);
mainGroup->setTitle(tr("Controls"));
QLabel *radiusLabel = new QLabel(mainGroup);
radiusLabel->setText(tr("Lens Radius:"));
QSlider *radiusSlider = new QSlider(Qt::Horizontal, mainGroup);
radiusSlider->setRange(15, 150);
radiusSlider->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
QLabel *deformLabel = new QLabel(mainGroup);
deformLabel->setText(tr("Deformation:"));
QSlider *deformSlider = new QSlider(Qt::Horizontal, mainGroup);
deformSlider->setRange(-100, 100);
deformSlider->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
QLabel *fontSizeLabel = new QLabel(mainGroup);
fontSizeLabel->setText(tr("Font Size:"));
QSlider *fontSizeSlider = new QSlider(Qt::Horizontal, mainGroup);
fontSizeSlider->setRange(16, 200);
fontSizeSlider->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
QPushButton *animateButton = new QPushButton(tr("Animated"), mainGroup);
animateButton->setCheckable(true);
#ifdef QT_OPENGL_SUPPORT
QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
enableOpenGLButton->setText(tr("Use OpenGL"));
enableOpenGLButton->setCheckable(mainGroup);
enableOpenGLButton->setChecked(m_renderer->usesOpenGL());
if (!QGLFormat::hasOpenGL())
enableOpenGLButton->hide();
#endif
QPushButton *quitButton = new QPushButton(tr("Quit"), mainGroup);
QPushButton *okButton = new QPushButton(tr("OK"), mainGroup);
QGridLayout *mainGroupLayout = new QGridLayout(mainGroup);
mainGroupLayout->setMargin(0);
mainGroupLayout->addWidget(radiusLabel, 0, 0, Qt::AlignRight);
mainGroupLayout->addWidget(radiusSlider, 0, 1);
mainGroupLayout->addWidget(deformLabel, 1, 0, Qt::AlignRight);
mainGroupLayout->addWidget(deformSlider, 1, 1);
mainGroupLayout->addWidget(fontSizeLabel, 2, 0, Qt::AlignRight);
mainGroupLayout->addWidget(fontSizeSlider, 2, 1);
mainGroupLayout->addWidget(animateButton, 3,0, 1,2);
#ifdef QT_OPENGL_SUPPORT
mainGroupLayout->addWidget(enableOpenGLButton, 4,0, 1,2);
#endif
QVBoxLayout *mainLayout = new QVBoxLayout(this);
mainLayout->addWidget(mainGroup);
mainLayout->addStretch(1);
mainLayout->addWidget(okButton);
mainLayout->addWidget(quitButton);
connect(quitButton, SIGNAL(clicked()), this, SLOT(emitQuitSignal()));
connect(okButton, SIGNAL(clicked()), this, SLOT(emitOkSignal()));
connect(radiusSlider, SIGNAL(valueChanged(int)), m_renderer, SLOT(setRadius(int)));
connect(deformSlider, SIGNAL(valueChanged(int)), m_renderer, SLOT(setIntensity(int)));
connect(fontSizeSlider, SIGNAL(valueChanged(int)), m_renderer, SLOT(setFontSize(int)));
connect(animateButton, SIGNAL(clicked(bool)), m_renderer, SLOT(setAnimated(bool)));
#ifdef QT_OPENGL_SUPPORT
connect(enableOpenGLButton, SIGNAL(clicked(bool)), m_renderer, SLOT(enableOpenGL(bool)));
#endif
animateButton->animateClick();
deformSlider->setValue(80);
fontSizeSlider->setValue(120);
QRect screen_size = QApplication::desktop()->screenGeometry();
radiusSlider->setValue(qMin(screen_size.width(), screen_size.height())/5);
m_renderer->setText(tr("Qt"));
}
void PathDeformControls::emitQuitSignal()
{ emit quitPressed(); }
void PathDeformControls::emitOkSignal()
{ emit okPressed(); }
PathDeformWidget::PathDeformWidget(QWidget *parent, bool smallScreen)
: QWidget(parent)
{
setWindowTitle(tr("Vector Deformation"));
m_renderer = new PathDeformRenderer(this, smallScreen);
m_renderer->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
<span class="comment">// Layouts</span>
QHBoxLayout *mainLayout = new QHBoxLayout(this);
mainLayout->addWidget(m_renderer);
m_controls = new PathDeformControls(0, m_renderer, smallScreen);
m_controls->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
if (!smallScreen)
mainLayout->addWidget(m_controls);
m_renderer->loadSourceFile(":res/deform/pathdeform.cpp");
m_renderer->loadDescription(":res/deform/pathdeform.html");
m_renderer->setDescriptionEnabled(false);
connect(m_renderer, SIGNAL(clicked()), this, SLOT(showControls()));
connect(m_controls, SIGNAL(okPressed()), this, SLOT(hideControls()));
connect(m_controls, SIGNAL(quitPressed()), QApplication::instance(), SLOT(quit()));
}
void PathDeformWidget::showControls()
{
m_controls->showFullScreen();
}
void PathDeformWidget::hideControls()
{
m_controls->hide();
}
void PathDeformWidget::setStyle( QStyle * style )
{
QWidget::setStyle(style);
if (m_controls != 0)
{
m_controls->setStyle(style);
QList<QWidget *> widgets = qFindChildren<QWidget *>(m_controls);
foreach (QWidget *w, widgets)
w->setStyle(style);
}
}
static inline QRect circle_bounds(const QPointF &center, qreal radius, qreal compensation)
{
return QRect(qRound(center.x() - radius - compensation),
qRound(center.y() - radius - compensation),
qRound((radius + compensation) * 2),
qRound((radius + compensation) * 2));
}
const int LENS_EXTENT = 10;
PathDeformRenderer::PathDeformRenderer(QWidget *widget, bool smallScreen)
: ArthurFrame(widget)
{
m_radius = 100;
m_pos = QPointF(m_radius, m_radius);
m_direction = QPointF(1, 1);
m_fontSize = 24;
m_animated = true;
m_repaintTimer.start(25, this);
m_repaintTracker.start();
m_intensity = 100;
m_smallScreen = smallScreen;
<span class="comment"> // m_fpsTimer.start(1000, this);</span>
<span class="comment"> // m_fpsCounter = 0;</span>
generateLensPixmap();
}
void PathDeformRenderer::setText(const QString &text)
{
m_text = text;
QFont f("times new roman,utopia");
f.setStyleStrategy(QFont::ForceOutline);
f.setPointSize(m_fontSize);
f.setStyleHint(QFont::Times);
QFontMetrics fm(f);
m_paths.clear();
m_pathBounds = QRect();
QPointF advance(0, 0);
bool do_quick = true;
for (int i=0; i<text.size(); ++i) {
if (text.at(i).unicode() >= 0x4ff && text.at(i).unicode() <= 0x1e00) {
do_quick = false;
break;
}
}
if (do_quick) {
for (int i=0; i<text.size(); ++i) {
QPainterPath path;
path.addText(advance, f, text.mid(i, 1));
m_pathBounds |= path.boundingRect();
m_paths << path;
advance += QPointF(fm.width(text.mid(i, 1)), 0);
}
} else {
QPainterPath path;
path.addText(advance, f, text);
m_pathBounds |= path.boundingRect();
m_paths << path;
}
for (int i=0; i<m_paths.size(); ++i)
m_paths[i] = m_paths[i] * QMatrix(1, 0, 0, 1, -m_pathBounds.x(), -m_pathBounds.y());
update();
}
void PathDeformRenderer::generateLensPixmap()
{
qreal rad = m_radius + LENS_EXTENT;
QRect bounds = circle_bounds(QPointF(), rad, 0);
QPainter painter;
if (preferImage()) {
m_lens_image = QImage(bounds.size(), QImage::Format_ARGB32_Premultiplied);
m_lens_image.fill(0);
painter.begin(&m_lens_image);
} else {
m_lens_pixmap = QPixmap(bounds.size());
m_lens_pixmap.fill(Qt::transparent);
painter.begin(&m_lens_pixmap);
}
QRadialGradient gr(rad, rad, rad, 3 * rad / 5, 3 * rad / 5);
gr.setColorAt(0.0, QColor(255, 255, 255, 191));
gr.setColorAt(0.2, QColor(255, 255, 127, 191));
gr.setColorAt(0.9, QColor(150, 150, 200, 63));
gr.setColorAt(0.95, QColor(0, 0, 0, 127));
gr.setColorAt(1, QColor(0, 0, 0, 0));
painter.setRenderHint(QPainter::Antialiasing);
painter.setBrush(gr);
painter.setPen(Qt::NoPen);
painter.drawEllipse(0, 0, bounds.width(), bounds.height());
}
void PathDeformRenderer::setAnimated(bool animated)
{
m_animated = animated;
if (m_animated) {
<span class="comment"> // m_fpsTimer.start(1000, this);</span>
<span class="comment"> // m_fpsCounter = 0;</span>
m_repaintTimer.start(25, this);
m_repaintTracker.start();
} else {
<span class="comment"> // m_fpsTimer.stop();</span>
m_repaintTimer.stop();
}
}
void PathDeformRenderer::timerEvent(QTimerEvent *e)
{
if (e->timerId() == m_repaintTimer.timerId()) {
if (QLineF(QPointF(0,0), m_direction).length() > 1)
m_direction *= 0.995;
qreal time = m_repaintTracker.restart();
QRect rectBefore = circle_bounds(m_pos, m_radius, m_fontSize);
qreal dx = m_direction.x();
qreal dy = m_direction.y();
if (time > 0) {
dx = dx * time * .1;
dy = dy * time * .1;
}
m_pos += QPointF(dx, dy);
if (m_pos.x() - m_radius < 0) {
m_direction.setX(-m_direction.x());
m_pos.setX(m_radius);
} else if (m_pos.x() + m_radius > width()) {
m_direction.setX(-m_direction.x());
m_pos.setX(width() - m_radius);
}
if (m_pos.y() - m_radius < 0) {
m_direction.setY(-m_direction.y());
m_pos.setY(m_radius);
} else if (m_pos.y() + m_radius > height()) {
m_direction.setY(-m_direction.y());
m_pos.setY(height() - m_radius);
}
#ifdef QT_OPENGL_SUPPORT
if (usesOpenGL()) {
update();
} else
#endif
{
QRect rectAfter = circle_bounds(m_pos, m_radius, m_fontSize);
update(rectAfter | rectBefore);
QApplication::syncX();
}
}
<span class="comment"> // else if (e->timerId() == m_fpsTimer.timerId()) {</span>
<span class="comment"> // printf("fps: %d\n", m_fpsCounter);</span>
<span class="comment"> // emit frameRate(m_fpsCounter);</span>
<span class="comment"> // m_fpsCounter = 0;</span>
<span class="comment"> // }</span>
}
void PathDeformRenderer::mousePressEvent(QMouseEvent *e)
{
setDescriptionEnabled(false);
m_repaintTimer.stop();
m_offset = QPointF();
if (QLineF(m_pos, e->pos()).length() <= m_radius)
m_offset = m_pos - e->pos();
m_mousePress = e->pos();
<span class="comment">// If we're not running in small screen mode, always assume we're dragging</span>
m_mouseDrag = !m_smallScreen;
mouseMoveEvent(e);
}
void PathDeformRenderer::mouseReleaseEvent(QMouseEvent *e)
{
if (e->buttons() == Qt::NoButton && m_animated) {
m_repaintTimer.start(10, this);
m_repaintTracker.start();
}
if (!m_mouseDrag && m_smallScreen)
emit clicked();
}
void PathDeformRenderer::mouseMoveEvent(QMouseEvent *e)
{
if (!m_mouseDrag && (QLineF(m_mousePress, e->pos()).length() > 25.0) )
m_mouseDrag = true;
if (m_mouseDrag) {
QRect rectBefore = circle_bounds(m_pos, m_radius, m_fontSize);
if (e->type() == QEvent::MouseMove) {
QLineF line(m_pos, e->pos() + m_offset);
line.setLength(line.length() * .1);
QPointF dir(line.dx(), line.dy());
m_direction = (m_direction + dir) / 2;
}
m_pos = e->pos() + m_offset;
#ifdef QT_OPENGL_SUPPORT
if (usesOpenGL()) {
update();
} else
#endif
{
QRect rectAfter = circle_bounds(m_pos, m_radius, m_fontSize);
update(rectBefore | rectAfter);
}
}
}
QPainterPath PathDeformRenderer::lensDeform(const QPainterPath &source, const QPointF &offset)
{
QPainterPath path;
path.addPath(source);
qreal flip = m_intensity / qreal(100);
for (int i=0; i<path.elementCount(); ++i) {
const QPainterPath::Element &e = path.elementAt(i);
qreal x = e.x + offset.x();
qreal y = e.y + offset.y();
qreal dx = x - m_pos.x();
qreal dy = y - m_pos.y();
qreal len = m_radius - qSqrt(dx * dx + dy * dy);
if (len > 0) {
path.setElementPositionAt(i,
x + flip * dx * len / m_radius,
y + flip * dy * len / m_radius);
} else {
path.setElementPositionAt(i, x, y);
}
}
return path;
}
void PathDeformRenderer::paint(QPainter *painter)
{
int pad_x = 5;
int pad_y = 5;
int skip_x = qRound(m_pathBounds.width() + pad_x + m_fontSize/2);
int skip_y = qRound(m_pathBounds.height() + pad_y);
painter->setPen(Qt::NoPen);
painter->setBrush(Qt::black);
QRectF clip(painter->clipPath().boundingRect());
int overlap = pad_x / 2;
for (int start_y=0; start_y < height(); start_y += skip_y) {
if (start_y > clip.bottom())
break;
int start_x = -overlap;
for (; start_x < width(); start_x += skip_x) {
if (start_y + skip_y >= clip.top() &&
start_x + skip_x >= clip.left() &&
start_x <= clip.right()) {
for (int i=0; i<m_paths.size(); ++i) {
QPainterPath path = lensDeform(m_paths[i], QPointF(start_x, start_y));
painter->drawPath(path);
}
}
}
overlap = skip_x - (start_x - width());
}
if (preferImage()) {
painter->drawImage(m_pos - QPointF(m_radius + LENS_EXTENT, m_radius + LENS_EXTENT),
m_lens_image);
} else {
painter->drawPixmap(m_pos - QPointF(m_radius + LENS_EXTENT, m_radius + LENS_EXTENT),
m_lens_pixmap);
}
}
void PathDeformRenderer::setRadius(int radius)
{
qreal max = qMax(m_radius, (qreal)radius);
m_radius = radius;
generateLensPixmap();
if (!m_animated || m_radius < max) {
#ifdef QT_OPENGL_SUPPORT
if (usesOpenGL()) {
update();
} else
#endif
{
update(circle_bounds(m_pos, max, m_fontSize));
}
}
}
void PathDeformRenderer::setIntensity(int intensity)
{
m_intensity = intensity;
if (!m_animated) {
#ifdef QT_OPENGL_SUPPORT
if (usesOpenGL()) {
update();
} else
#endif
{
update(circle_bounds(m_pos, m_radius, m_fontSize));
}
}
}</pre>
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<td width="20%" align="center"><a href="trademarks.html">Trademarks</a></td>
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