pathdeform.cpp Example File

painting/deform/pathdeform.cpp
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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, SIGNAL(quitPressed())); connect(okButton, SIGNAL(clicked()), this, SIGNAL(okPressed())); 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")); } 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); // Layouts 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) return; m_controls->setStyle(style); QList<QWidget *> widgets = m_controls->findChildren<QWidget *>(); 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; // m_fpsTimer.start(1000, this); // m_fpsCounter = 0; 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.horizontalAdvance(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) { // m_fpsTimer.start(1000, this); // m_fpsCounter = 0; m_repaintTimer.start(25, this); m_repaintTracker.start(); } else { // m_fpsTimer.stop(); 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); } } // else if (e->timerId() == m_fpsTimer.timerId()) { // printf("fps: %d\n", m_fpsCounter); // emit frameRate(m_fpsCounter); // m_fpsCounter = 0; // } } 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(); // If we're not running in small screen mode, always assume we're dragging 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(); return; } #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(); return; } #endif update(circle_bounds(m_pos, m_radius, m_fontSize)); } }

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