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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "pathdeform.h"
++
++ #include <QGuiApplication>
++ #include <QScreen>
++ #include <QtDebug>
++ #include <QMouseEvent>
++ #include <QTimerEvent>
++ #include <QLayout>
++ #include <QLineEdit>
++ #include <QPainter>
++ #include <QSlider>
++ #include <QLabel>
++ #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);
++
++ 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);
++
++ 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->setContentsMargins(QMargins());
++
++ connect(radiusSlider, &QAbstractSlider::valueChanged, m_renderer, &PathDeformRenderer::setRadius);
++ connect(deformSlider, &QAbstractSlider::valueChanged, m_renderer, &PathDeformRenderer::setIntensity);
++ connect(fontSizeSlider, &QAbstractSlider::valueChanged, m_renderer, &PathDeformRenderer::setFontSize);
++ connect(animateButton, &QAbstractButton::clicked, m_renderer, &PathDeformRenderer::setAnimated);
++
++ connect(textInput, &QLineEdit::textChanged, m_renderer, &PathDeformRenderer::setText);
++
++ 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);
++
++ QPushButton *quitButton = new QPushButton(tr("Quit"), mainGroup);
++ QPushButton *okButton = new QPushButton(tr("OK"), mainGroup);
++
++
++ QGridLayout *mainGroupLayout = new QGridLayout(mainGroup);
++ mainGroupLayout->setContentsMargins(QMargins());
++ 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);
++
++ QVBoxLayout *mainLayout = new QVBoxLayout(this);
++ mainLayout->addWidget(mainGroup);
++ mainLayout->addStretch(1);
++ mainLayout->addWidget(okButton);
++ mainLayout->addWidget(quitButton);
++
++ connect(quitButton, &QAbstractButton::clicked, this, &PathDeformControls::quitPressed);
++ connect(okButton, &QAbstractButton::clicked, this, &PathDeformControls::okPressed);
++ connect(radiusSlider, &QAbstractSlider::valueChanged, m_renderer, &PathDeformRenderer::setRadius);
++ connect(deformSlider, &QAbstractSlider::valueChanged, m_renderer, &PathDeformRenderer::setIntensity);
++ connect(fontSizeSlider, &QAbstractSlider::valueChanged, m_renderer, &PathDeformRenderer::setFontSize);
++ connect(animateButton, &QAbstractButton::clicked, m_renderer, &PathDeformRenderer::setAnimated);
++
++ animateButton->animateClick();
++ deformSlider->setValue(80);
++ fontSizeSlider->setValue(120);
++
++ QRect screen_size = QGuiApplication::primaryScreen()->geometry();
++ 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(nullptr, m_renderer, smallScreen);
++ m_controls->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
++
++ if (!smallScreen)
++ mainLayout->addWidget(m_controls);
++
++ connect(m_renderer, &PathDeformRenderer::clicked,
++ this, &PathDeformWidget::showControls);
++ connect(m_controls, &PathDeformControls::okPressed,
++ this, &PathDeformWidget::hideControls);
++ connect(m_controls, &PathDeformControls::quitPressed,
++ qApp, &QCoreApplication::quit);
++ }
++
++
++ void PathDeformWidget::showControls()
++ {
++ m_controls->showFullScreen();
++ }
++
++ void PathDeformWidget::hideControls()
++ {
++ m_controls->hide();
++ }
++
++ void PathDeformWidget::setStyle(QStyle *style)
++ {
++ QWidget::setStyle(style);
++ if (!m_controls)
++ return;
++
++ m_controls->setStyle(style);
++
++ const QList<QWidget *> widgets = m_controls->findChildren<QWidget *>();
++ for (QWidget *w : widgets)
++ w->setStyle(style);
++ }
++
++ static inline QRect circle_bounds(const QPointF ¢er, 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] * QTransform(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);
++ }
++
++ QRect rectAfter = circle_bounds(m_pos, m_radius, m_fontSize);
++ update(rectAfter | rectBefore);
++ }
++ }
++
++ void PathDeformRenderer::mousePressEvent(QMouseEvent *e)
++ {
++ m_repaintTimer.stop();
++ m_offset = QPointF();
++ if (QLineF(m_pos, e->position().toPoint()).length() <= m_radius)
++ m_offset = m_pos - e->position().toPoint();
++
++ m_mousePress = e->position().toPoint();
++
++ // 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->position().toPoint()).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->position().toPoint() + m_offset);
++ line.setLength(line.length() * .1);
++ QPointF dir(line.dx(), line.dy());
++ m_direction = (m_direction + dir) / 2;
++ }
++ m_pos = e->position().toPoint() + m_offset;
++ 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)
++ update(circle_bounds(m_pos, max, m_fontSize));
++ }
++
++ void PathDeformRenderer::setIntensity(int intensity)
++ {
++ m_intensity = intensity;
++ if (!m_animated)
++ update(circle_bounds(m_pos, m_radius, m_fontSize));
++ }