1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the demonstration applications of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:BSD$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** BSD License Usage
18** Alternatively, you may use this file under the terms of the BSD license
19** as follows:
20**
21** "Redistribution and use in source and binary forms, with or without
22** modification, are permitted provided that the following conditions are
23** met:
24** * Redistributions of source code must retain the above copyright
25** notice, this list of conditions and the following disclaimer.
26** * Redistributions in binary form must reproduce the above copyright
27** notice, this list of conditions and the following disclaimer in
28** the documentation and/or other materials provided with the
29** distribution.
30** * Neither the name of The Qt Company Ltd nor the names of its
31** contributors may be used to endorse or promote products derived
32** from this software without specific prior written permission.
33**
34**
35** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
46**
47** $QT_END_LICENSE$
48**
49****************************************************************************/
50
51#include "pathdeform.h"
52
53#include <QGuiApplication>
54#include <QScreen>
55#include <QtDebug>
56#include <QMouseEvent>
57#include <QTimerEvent>
58#include <QLayout>
59#include <QLineEdit>
60#include <QPainter>
61#include <QSlider>
62#include <QLabel>
63#include <QDesktopWidget>
64#include <qmath.h>
65
66PathDeformControls::PathDeformControls(QWidget *parent,
67 PathDeformRenderer* renderer, bool smallScreen)
68 : QWidget(parent)
69{
70 m_renderer = renderer;
71
72 if (smallScreen)
73 layoutForSmallScreen();
74 else
75 layoutForDesktop();
76}
77
78void PathDeformControls::layoutForDesktop()
79{
80 QGroupBox* mainGroup = new QGroupBox(this);
81 mainGroup->setTitle(tr(s: "Controls"));
82
83 QGroupBox *radiusGroup = new QGroupBox(mainGroup);
84 radiusGroup->setTitle(tr(s: "Lens Radius"));
85 QSlider *radiusSlider = new QSlider(Qt::Horizontal, radiusGroup);
86 radiusSlider->setRange(min: 15, max: 150);
87 radiusSlider->setSizePolicy(hor: QSizePolicy::Preferred, ver: QSizePolicy::Fixed);
88
89 QGroupBox *deformGroup = new QGroupBox(mainGroup);
90 deformGroup->setTitle(tr(s: "Deformation"));
91 QSlider *deformSlider = new QSlider(Qt::Horizontal, deformGroup);
92 deformSlider->setRange(min: -100, max: 100);
93 deformSlider->setSizePolicy(hor: QSizePolicy::Preferred, ver: QSizePolicy::Fixed);
94
95 QGroupBox *fontSizeGroup = new QGroupBox(mainGroup);
96 fontSizeGroup->setTitle(tr(s: "Font Size"));
97 QSlider *fontSizeSlider = new QSlider(Qt::Horizontal, fontSizeGroup);
98 fontSizeSlider->setRange(min: 16, max: 200);
99 fontSizeSlider->setSizePolicy(hor: QSizePolicy::Preferred, ver: QSizePolicy::Fixed);
100
101 QGroupBox *textGroup = new QGroupBox(mainGroup);
102 textGroup->setTitle(tr(s: "Text"));
103 QLineEdit *textInput = new QLineEdit(textGroup);
104
105 QPushButton *animateButton = new QPushButton(mainGroup);
106 animateButton->setText(tr(s: "Animated"));
107 animateButton->setCheckable(true);
108
109 QPushButton *showSourceButton = new QPushButton(mainGroup);
110 showSourceButton->setText(tr(s: "Show Source"));
111
112#if QT_CONFIG(opengl)
113 QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
114 enableOpenGLButton->setText(tr(s: "Use OpenGL"));
115 enableOpenGLButton->setCheckable(true);
116 enableOpenGLButton->setChecked(m_renderer->usesOpenGL());
117#endif
118
119 QPushButton *whatsThisButton = new QPushButton(mainGroup);
120 whatsThisButton->setText(tr(s: "What's This?"));
121 whatsThisButton->setCheckable(true);
122
123
124 mainGroup->setFixedWidth(180);
125
126 QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);
127 mainGroupLayout->addWidget(radiusGroup);
128 mainGroupLayout->addWidget(deformGroup);
129 mainGroupLayout->addWidget(fontSizeGroup);
130 mainGroupLayout->addWidget(textGroup);
131 mainGroupLayout->addWidget(animateButton);
132 mainGroupLayout->addStretch(stretch: 1);
133#if QT_CONFIG(opengl)
134 mainGroupLayout->addWidget(enableOpenGLButton);
135#endif
136 mainGroupLayout->addWidget(showSourceButton);
137 mainGroupLayout->addWidget(whatsThisButton);
138
139 QVBoxLayout *radiusGroupLayout = new QVBoxLayout(radiusGroup);
140 radiusGroupLayout->addWidget(radiusSlider);
141
142 QVBoxLayout *deformGroupLayout = new QVBoxLayout(deformGroup);
143 deformGroupLayout->addWidget(deformSlider);
144
145 QVBoxLayout *fontSizeGroupLayout = new QVBoxLayout(fontSizeGroup);
146 fontSizeGroupLayout->addWidget(fontSizeSlider);
147
148 QVBoxLayout *textGroupLayout = new QVBoxLayout(textGroup);
149 textGroupLayout->addWidget(textInput);
150
151 QVBoxLayout * mainLayout = new QVBoxLayout(this);
152 mainLayout->addWidget(mainGroup);
153 mainLayout->setContentsMargins(QMargins());
154
155 connect(sender: radiusSlider, signal: &QAbstractSlider::valueChanged, receiver: m_renderer, slot: &PathDeformRenderer::setRadius);
156 connect(sender: deformSlider, signal: &QAbstractSlider::valueChanged, receiver: m_renderer, slot: &PathDeformRenderer::setIntensity);
157 connect(sender: fontSizeSlider, signal: &QAbstractSlider::valueChanged, receiver: m_renderer, slot: &PathDeformRenderer::setFontSize);
158 connect(sender: animateButton, signal: &QAbstractButton::clicked, receiver: m_renderer, slot: &PathDeformRenderer::setAnimated);
159#if QT_CONFIG(opengl)
160 connect(sender: enableOpenGLButton, signal: &QAbstractButton::clicked, receiver: m_renderer, slot: &ArthurFrame::enableOpenGL);
161#endif
162
163 connect(sender: textInput, signal: &QLineEdit::textChanged, receiver: m_renderer, slot: &PathDeformRenderer::setText);
164 connect(sender: m_renderer, signal: &ArthurFrame::descriptionEnabledChanged,
165 receiver: whatsThisButton, slot: &QAbstractButton::setChecked);
166 connect(sender: whatsThisButton, signal: &QAbstractButton::clicked, receiver: m_renderer, slot: &ArthurFrame::setDescriptionEnabled);
167 connect(sender: showSourceButton, signal: &QAbstractButton::clicked, receiver: m_renderer, slot: &ArthurFrame::showSource);
168
169 animateButton->animateClick();
170 deformSlider->setValue(80);
171 fontSizeSlider->setValue(120);
172 radiusSlider->setValue(100);
173 textInput->setText(tr(s: "Qt"));
174}
175
176void PathDeformControls::layoutForSmallScreen()
177{
178 QGroupBox* mainGroup = new QGroupBox(this);
179 mainGroup->setTitle(tr(s: "Controls"));
180
181 QLabel *radiusLabel = new QLabel(mainGroup);
182 radiusLabel->setText(tr(s: "Lens Radius:"));
183 QSlider *radiusSlider = new QSlider(Qt::Horizontal, mainGroup);
184 radiusSlider->setRange(min: 15, max: 150);
185 radiusSlider->setSizePolicy(hor: QSizePolicy::Expanding, ver: QSizePolicy::Fixed);
186
187 QLabel *deformLabel = new QLabel(mainGroup);
188 deformLabel->setText(tr(s: "Deformation:"));
189 QSlider *deformSlider = new QSlider(Qt::Horizontal, mainGroup);
190 deformSlider->setRange(min: -100, max: 100);
191 deformSlider->setSizePolicy(hor: QSizePolicy::Expanding, ver: QSizePolicy::Fixed);
192
193 QLabel *fontSizeLabel = new QLabel(mainGroup);
194 fontSizeLabel->setText(tr(s: "Font Size:"));
195 QSlider *fontSizeSlider = new QSlider(Qt::Horizontal, mainGroup);
196 fontSizeSlider->setRange(min: 16, max: 200);
197 fontSizeSlider->setSizePolicy(hor: QSizePolicy::Expanding, ver: QSizePolicy::Fixed);
198
199 QPushButton *animateButton = new QPushButton(tr(s: "Animated"), mainGroup);
200 animateButton->setCheckable(true);
201
202#if QT_CONFIG(opengl)
203 QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
204 enableOpenGLButton->setText(tr(s: "Use OpenGL"));
205 enableOpenGLButton->setCheckable(mainGroup);
206 enableOpenGLButton->setChecked(m_renderer->usesOpenGL());
207#endif
208
209 QPushButton *quitButton = new QPushButton(tr(s: "Quit"), mainGroup);
210 QPushButton *okButton = new QPushButton(tr(s: "OK"), mainGroup);
211
212
213 QGridLayout *mainGroupLayout = new QGridLayout(mainGroup);
214 mainGroupLayout->setContentsMargins(QMargins());
215 mainGroupLayout->addWidget(radiusLabel, row: 0, column: 0, Qt::AlignRight);
216 mainGroupLayout->addWidget(radiusSlider, row: 0, column: 1);
217 mainGroupLayout->addWidget(deformLabel, row: 1, column: 0, Qt::AlignRight);
218 mainGroupLayout->addWidget(deformSlider, row: 1, column: 1);
219 mainGroupLayout->addWidget(fontSizeLabel, row: 2, column: 0, Qt::AlignRight);
220 mainGroupLayout->addWidget(fontSizeSlider, row: 2, column: 1);
221 mainGroupLayout->addWidget(animateButton, row: 3,column: 0, rowSpan: 1,columnSpan: 2);
222#if QT_CONFIG(opengl)
223 mainGroupLayout->addWidget(enableOpenGLButton, row: 4,column: 0, rowSpan: 1,columnSpan: 2);
224#endif
225
226 QVBoxLayout *mainLayout = new QVBoxLayout(this);
227 mainLayout->addWidget(mainGroup);
228 mainLayout->addStretch(stretch: 1);
229 mainLayout->addWidget(okButton);
230 mainLayout->addWidget(quitButton);
231
232 connect(sender: quitButton, signal: &QAbstractButton::clicked, receiver: this, slot: &PathDeformControls::quitPressed);
233 connect(sender: okButton, signal: &QAbstractButton::clicked, receiver: this, slot: &PathDeformControls::okPressed);
234 connect(sender: radiusSlider, signal: &QAbstractSlider::valueChanged, receiver: m_renderer, slot: &PathDeformRenderer::setRadius);
235 connect(sender: deformSlider, signal: &QAbstractSlider::valueChanged, receiver: m_renderer, slot: &PathDeformRenderer::setIntensity);
236 connect(sender: fontSizeSlider, signal: &QAbstractSlider::valueChanged, receiver: m_renderer, slot: &PathDeformRenderer::setFontSize);
237 connect(sender: animateButton, signal: &QAbstractButton::clicked, receiver: m_renderer, slot: &PathDeformRenderer::setAnimated);
238#if QT_CONFIG(opengl)
239 connect(sender: enableOpenGLButton, signal: &QAbstractButton::clicked, receiver: m_renderer, slot: &ArthurFrame::enableOpenGL);
240#endif
241
242
243 animateButton->animateClick();
244 deformSlider->setValue(80);
245 fontSizeSlider->setValue(120);
246
247 QRect screen_size = QGuiApplication::primaryScreen()->geometry();
248 radiusSlider->setValue(qMin(a: screen_size.width(), b: screen_size.height())/5);
249
250 m_renderer->setText(tr(s: "Qt"));
251}
252
253PathDeformWidget::PathDeformWidget(QWidget *parent, bool smallScreen)
254 : QWidget(parent)
255{
256 setWindowTitle(tr(s: "Vector Deformation"));
257
258 m_renderer = new PathDeformRenderer(this, smallScreen);
259 m_renderer->setSizePolicy(hor: QSizePolicy::Expanding, ver: QSizePolicy::Expanding);
260
261 // Layouts
262 QHBoxLayout *mainLayout = new QHBoxLayout(this);
263 mainLayout->addWidget(m_renderer);
264
265 m_controls = new PathDeformControls(nullptr, m_renderer, smallScreen);
266 m_controls->setSizePolicy(hor: QSizePolicy::Fixed, ver: QSizePolicy::Minimum);
267
268 if (!smallScreen)
269 mainLayout->addWidget(m_controls);
270
271 m_renderer->loadSourceFile(fileName: ":res/deform/pathdeform.cpp");
272 m_renderer->loadDescription(filename: ":res/deform/pathdeform.html");
273 m_renderer->setDescriptionEnabled(false);
274
275 connect(sender: m_renderer, signal: &PathDeformRenderer::clicked,
276 receiver: this, slot: &PathDeformWidget::showControls);
277 connect(sender: m_controls, signal: &PathDeformControls::okPressed,
278 receiver: this, slot: &PathDeformWidget::hideControls);
279 connect(sender: m_controls, signal: &PathDeformControls::quitPressed,
280 qApp, slot: &QCoreApplication::quit);
281}
282
283
284void PathDeformWidget::showControls()
285{
286 m_controls->showFullScreen();
287}
288
289void PathDeformWidget::hideControls()
290{
291 m_controls->hide();
292}
293
294void PathDeformWidget::setStyle(QStyle *style)
295{
296 QWidget::setStyle(style);
297 if (!m_controls)
298 return;
299
300 m_controls->setStyle(style);
301
302 const QList<QWidget *> widgets = m_controls->findChildren<QWidget *>();
303 for (QWidget *w : widgets)
304 w->setStyle(style);
305}
306
307static inline QRect circle_bounds(const QPointF &center, qreal radius, qreal compensation)
308{
309 return QRect(qRound(d: center.x() - radius - compensation),
310 qRound(d: center.y() - radius - compensation),
311 qRound(d: (radius + compensation) * 2),
312 qRound(d: (radius + compensation) * 2));
313
314}
315
316const int LENS_EXTENT = 10;
317
318PathDeformRenderer::PathDeformRenderer(QWidget *widget, bool smallScreen)
319 : ArthurFrame(widget)
320{
321 m_radius = 100;
322 m_pos = QPointF(m_radius, m_radius);
323 m_direction = QPointF(1, 1);
324 m_fontSize = 24;
325 m_animated = true;
326 m_repaintTimer.start(msec: 25, obj: this);
327 m_repaintTracker.start();
328 m_intensity = 100;
329 m_smallScreen = smallScreen;
330
331// m_fpsTimer.start(1000, this);
332// m_fpsCounter = 0;
333
334 generateLensPixmap();
335}
336
337void PathDeformRenderer::setText(const QString &text)
338{
339 m_text = text;
340
341 QFont f("times new roman,utopia");
342 f.setStyleStrategy(QFont::ForceOutline);
343 f.setPointSize(m_fontSize);
344 f.setStyleHint(QFont::Times);
345
346 QFontMetrics fm(f);
347
348 m_paths.clear();
349 m_pathBounds = QRect();
350
351 QPointF advance(0, 0);
352
353 bool do_quick = true;
354 for (int i=0; i<text.size(); ++i) {
355 if (text.at(i).unicode() >= 0x4ff && text.at(i).unicode() <= 0x1e00) {
356 do_quick = false;
357 break;
358 }
359 }
360
361 if (do_quick) {
362 for (int i=0; i<text.size(); ++i) {
363 QPainterPath path;
364 path.addText(point: advance, f, text: text.mid(position: i, n: 1));
365 m_pathBounds |= path.boundingRect();
366 m_paths << path;
367 advance += QPointF(fm.horizontalAdvance(text.mid(position: i, n: 1)), 0);
368 }
369 } else {
370 QPainterPath path;
371 path.addText(point: advance, f, text);
372 m_pathBounds |= path.boundingRect();
373 m_paths << path;
374 }
375
376 for (int i=0; i<m_paths.size(); ++i)
377 m_paths[i] = m_paths[i] * QTransform(1, 0, 0, 1, -m_pathBounds.x(), -m_pathBounds.y());
378
379 update();
380}
381
382
383void PathDeformRenderer::generateLensPixmap()
384{
385 qreal rad = m_radius + LENS_EXTENT;
386
387 QRect bounds = circle_bounds(center: QPointF(), radius: rad, compensation: 0);
388
389 QPainter painter;
390
391 if (preferImage()) {
392 m_lens_image = QImage(bounds.size(), QImage::Format_ARGB32_Premultiplied);
393 m_lens_image.fill(pixel: 0);
394 painter.begin(&m_lens_image);
395 } else {
396 m_lens_pixmap = QPixmap(bounds.size());
397 m_lens_pixmap.fill(fillColor: Qt::transparent);
398 painter.begin(&m_lens_pixmap);
399 }
400
401 QRadialGradient gr(rad, rad, rad, 3 * rad / 5, 3 * rad / 5);
402 gr.setColorAt(pos: 0.0, color: QColor(255, 255, 255, 191));
403 gr.setColorAt(pos: 0.2, color: QColor(255, 255, 127, 191));
404 gr.setColorAt(pos: 0.9, color: QColor(150, 150, 200, 63));
405 gr.setColorAt(pos: 0.95, color: QColor(0, 0, 0, 127));
406 gr.setColorAt(pos: 1, color: QColor(0, 0, 0, 0));
407 painter.setRenderHint(hint: QPainter::Antialiasing);
408 painter.setBrush(gr);
409 painter.setPen(Qt::NoPen);
410 painter.drawEllipse(x: 0, y: 0, w: bounds.width(), h: bounds.height());
411}
412
413
414void PathDeformRenderer::setAnimated(bool animated)
415{
416 m_animated = animated;
417
418 if (m_animated) {
419// m_fpsTimer.start(1000, this);
420// m_fpsCounter = 0;
421 m_repaintTimer.start(msec: 25, obj: this);
422 m_repaintTracker.start();
423 } else {
424// m_fpsTimer.stop();
425 m_repaintTimer.stop();
426 }
427}
428
429void PathDeformRenderer::timerEvent(QTimerEvent *e)
430{
431
432 if (e->timerId() == m_repaintTimer.timerId()) {
433
434 if (QLineF(QPointF(0,0), m_direction).length() > 1)
435 m_direction *= 0.995;
436 qreal time = m_repaintTracker.restart();
437
438 QRect rectBefore = circle_bounds(center: m_pos, radius: m_radius, compensation: m_fontSize);
439
440 qreal dx = m_direction.x();
441 qreal dy = m_direction.y();
442 if (time > 0) {
443 dx = dx * time * .1;
444 dy = dy * time * .1;
445 }
446
447 m_pos += QPointF(dx, dy);
448
449 if (m_pos.x() - m_radius < 0) {
450 m_direction.setX(-m_direction.x());
451 m_pos.setX(m_radius);
452 } else if (m_pos.x() + m_radius > width()) {
453 m_direction.setX(-m_direction.x());
454 m_pos.setX(width() - m_radius);
455 }
456
457 if (m_pos.y() - m_radius < 0) {
458 m_direction.setY(-m_direction.y());
459 m_pos.setY(m_radius);
460 } else if (m_pos.y() + m_radius > height()) {
461 m_direction.setY(-m_direction.y());
462 m_pos.setY(height() - m_radius);
463 }
464
465#if QT_CONFIG(opengl)
466 if (usesOpenGL()) {
467 update();
468 } else
469#endif
470 {
471 QRect rectAfter = circle_bounds(center: m_pos, radius: m_radius, compensation: m_fontSize);
472 update(rectAfter | rectBefore);
473 }
474 }
475// else if (e->timerId() == m_fpsTimer.timerId()) {
476// printf("fps: %d\n", m_fpsCounter);
477// emit frameRate(m_fpsCounter);
478// m_fpsCounter = 0;
479
480// }
481}
482
483void PathDeformRenderer::mousePressEvent(QMouseEvent *e)
484{
485 if (m_show_doc) {
486 setDescriptionEnabled(false);
487 return;
488 }
489 setDescriptionEnabled(false);
490
491 m_repaintTimer.stop();
492 m_offset = QPointF();
493 if (QLineF(m_pos, e->pos()).length() <= m_radius)
494 m_offset = m_pos - e->pos();
495
496 m_mousePress = e->pos();
497
498 // If we're not running in small screen mode, always assume we're dragging
499 m_mouseDrag = !m_smallScreen;
500
501 mouseMoveEvent(e);
502}
503
504void PathDeformRenderer::mouseReleaseEvent(QMouseEvent *e)
505{
506 if (e->buttons() == Qt::NoButton && m_animated) {
507 m_repaintTimer.start(msec: 10, obj: this);
508 m_repaintTracker.start();
509 }
510
511 if (!m_mouseDrag && m_smallScreen)
512 emit clicked();
513}
514
515void PathDeformRenderer::mouseMoveEvent(QMouseEvent *e)
516{
517 if (!m_mouseDrag && (QLineF(m_mousePress, e->pos()).length() > 25.0) )
518 m_mouseDrag = true;
519
520 if (m_mouseDrag) {
521 QRect rectBefore = circle_bounds(center: m_pos, radius: m_radius, compensation: m_fontSize);
522 if (e->type() == QEvent::MouseMove) {
523 QLineF line(m_pos, e->pos() + m_offset);
524 line.setLength(line.length() * .1);
525 QPointF dir(line.dx(), line.dy());
526 m_direction = (m_direction + dir) / 2;
527 }
528 m_pos = e->pos() + m_offset;
529#if QT_CONFIG(opengl)
530 if (usesOpenGL()) {
531 update();
532 } else
533#endif
534 {
535 QRect rectAfter = circle_bounds(center: m_pos, radius: m_radius, compensation: m_fontSize);
536 update(rectBefore | rectAfter);
537 }
538 }
539}
540
541QPainterPath PathDeformRenderer::lensDeform(const QPainterPath &source, const QPointF &offset)
542{
543 QPainterPath path;
544 path.addPath(path: source);
545
546 qreal flip = m_intensity / qreal(100);
547
548 for (int i=0; i<path.elementCount(); ++i) {
549 const QPainterPath::Element &e = path.elementAt(i);
550
551 qreal x = e.x + offset.x();
552 qreal y = e.y + offset.y();
553
554 qreal dx = x - m_pos.x();
555 qreal dy = y - m_pos.y();
556 qreal len = m_radius - qSqrt(v: dx * dx + dy * dy);
557
558 if (len > 0) {
559 path.setElementPositionAt(i,
560 x: x + flip * dx * len / m_radius,
561 y: y + flip * dy * len / m_radius);
562 } else {
563 path.setElementPositionAt(i, x, y);
564 }
565
566 }
567
568 return path;
569}
570
571void PathDeformRenderer::paint(QPainter *painter)
572{
573 int pad_x = 5;
574 int pad_y = 5;
575
576 int skip_x = qRound(d: m_pathBounds.width() + pad_x + m_fontSize/2);
577 int skip_y = qRound(d: m_pathBounds.height() + pad_y);
578
579 painter->setPen(Qt::NoPen);
580 painter->setBrush(Qt::black);
581
582 QRectF clip(painter->clipPath().boundingRect());
583
584 int overlap = pad_x / 2;
585
586 for (int start_y=0; start_y < height(); start_y += skip_y) {
587
588 if (start_y > clip.bottom())
589 break;
590
591 int start_x = -overlap;
592 for (; start_x < width(); start_x += skip_x) {
593
594 if (start_y + skip_y >= clip.top() &&
595 start_x + skip_x >= clip.left() &&
596 start_x <= clip.right()) {
597 for (int i=0; i<m_paths.size(); ++i) {
598 QPainterPath path = lensDeform(source: m_paths[i], offset: QPointF(start_x, start_y));
599 painter->drawPath(path);
600 }
601 }
602 }
603 overlap = skip_x - (start_x - width());
604
605 }
606
607 if (preferImage()) {
608 painter->drawImage(p: m_pos - QPointF(m_radius + LENS_EXTENT, m_radius + LENS_EXTENT),
609 image: m_lens_image);
610 } else {
611 painter->drawPixmap(p: m_pos - QPointF(m_radius + LENS_EXTENT, m_radius + LENS_EXTENT),
612 pm: m_lens_pixmap);
613 }
614}
615
616void PathDeformRenderer::setRadius(int radius)
617{
618 qreal max = qMax(a: m_radius, b: (qreal)radius);
619 m_radius = radius;
620 generateLensPixmap();
621 if (!m_animated || m_radius < max) {
622#if QT_CONFIG(opengl)
623 if (usesOpenGL()){
624 update();
625 return;
626 }
627#endif
628 update(circle_bounds(center: m_pos, radius: max, compensation: m_fontSize));
629 }
630}
631
632void PathDeformRenderer::setIntensity(int intensity)
633{
634 m_intensity = intensity;
635 if (!m_animated) {
636#if QT_CONFIG(opengl)
637 if (usesOpenGL()) {
638 update();
639 return;
640 }
641#endif
642 update(circle_bounds(center: m_pos, radius: m_radius, compensation: m_fontSize));
643 }
644}
645

source code of qtbase/examples/widgets/painting/deform/pathdeform.cpp