Qt
Internal/Contributor docs for the Qt SDK. Note: These are NOT official API docs; those are found at https://doc.qt.io/
Loading...
Searching...
No Matches
qtgradientwidget.cpp
Go to the documentation of this file.
1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#include "qtgradientwidget_p.h"
5#include <QtCore/QMap>
6#include <QtGui/QImage>
7#include <QtGui/QPainter>
8#include <QtWidgets/QScrollBar>
9#include <QtGui/QMouseEvent>
10#include <QtGui/QRegion>
11
12#ifndef _USE_MATH_DEFINES
13#define _USE_MATH_DEFINES
14#endif
15
16#include "qmath.h"
17
18QT_BEGIN_NAMESPACE
19
20class QtGradientWidgetPrivate
21{
22 QtGradientWidget *q_ptr;
23 Q_DECLARE_PUBLIC(QtGradientWidget)
24public:
25 QPointF fromViewport(QPointF point) const;
26 QPointF toViewport(QPointF point) const;
27// void setupDrag(QtGradientStop *stop, int x);
28
29 QPointF checkRange(QPointF point) const;
30 QRectF pointRect(QPointF point, double size) const;
31
32 double correctAngle(double angle) const;
33 void setAngleConical(double angle);
34
35 void paintPoint(QPainter *painter, QPointF point, double size) const;
36
37 double m_handleSize;
38 bool m_backgroundCheckered;
39
40 QGradientStops m_gradientStops;
41 QGradient::Type m_gradientType;
42 QGradient::Spread m_gradientSpread;
43 QPointF m_startLinear;
44 QPointF m_endLinear;
45 QPointF m_centralRadial;
46 QPointF m_focalRadial;
47 qreal m_radiusRadial;
48 QPointF m_centralConical;
49 qreal m_angleConical;
50
61
62 Handle m_dragHandle;
63 QPointF m_dragOffset;
64 //double m_radiusOffset;
65 double m_radiusFactor;
66 double m_dragRadius;
67 double m_angleOffset;
68 double m_dragAngle;
69};
70
71double QtGradientWidgetPrivate::correctAngle(double angle) const
72{
73 double a = angle;
74 while (a >= 360)
75 a -= 360;
76 while (a < 0)
77 a += 360;
78 return a;
79}
80
81void QtGradientWidgetPrivate::setAngleConical(double angle)
82{
83 double a = correctAngle(angle);
84 if (m_angleConical == a)
85 return;
86 m_angleConical = a;
87 emit q_ptr->angleConicalChanged(m_angleConical);
88}
89
90QRectF QtGradientWidgetPrivate::pointRect(QPointF point, double size) const
91{
92 return QRectF(point.x() - size / 2, point.y() - size / 2, size, size);
93}
94
95QPointF QtGradientWidgetPrivate::checkRange(QPointF point) const
96{
97 QPointF p = point;
98 if (p.x() > 1)
99 p.setX(1);
100 else if (p.x() < 0)
101 p.setX(0);
102 if (p.y() > 1)
103 p.setY(1);
104 else if (p.y() < 0)
105 p.setY(0);
106 return p;
107}
108
109QPointF QtGradientWidgetPrivate::fromViewport(QPointF point) const
110{
111 QSize size = q_ptr->size();
112 return QPointF(point.x() / size.width(), point.y() / size.height());
113}
114
115QPointF QtGradientWidgetPrivate::toViewport(QPointF point) const
116{
117 QSize size = q_ptr->size();
118 return QPointF(point.x() * size.width(), point.y() * size.height());
119}
120
121void QtGradientWidgetPrivate::paintPoint(QPainter *painter, QPointF point,
122 double size) const
123{
124 QPointF pf = toViewport(point);
125 QRectF rf = pointRect(pf, size);
126
127 QPen pen;
128 pen.setWidthF(1);
129 QColor alphaZero = Qt::white;
130 alphaZero.setAlpha(0);
131
132 painter->save();
133 painter->drawEllipse(rf);
134
135 /*
136 painter->save();
137
138 QLinearGradient lgV(0, rf.top(), 0, rf.bottom());
139 lgV.setColorAt(0, alphaZero);
140 lgV.setColorAt(0.25, Qt::white);
141 lgV.setColorAt(0.25, Qt::white);
142 lgV.setColorAt(1, alphaZero);
143 pen.setBrush(lgV);
144 painter->setPen(pen);
145
146 painter->drawLine(QPointF(pf.x(), rf.top()), QPointF(pf.x(), rf.bottom()));
147
148 QLinearGradient lgH(rf.left(), 0, rf.right(), 0);
149 lgH.setColorAt(0, alphaZero);
150 lgH.setColorAt(0.5, Qt::white);
151 lgH.setColorAt(1, alphaZero);
152 pen.setBrush(lgH);
153 painter->setPen(pen);
154
155 painter->drawLine(QPointF(rf.left(), pf.y()), QPointF(rf.right(), pf.y()));
156
157 painter->restore();
158 */
159
160 painter->restore();
161}
162
163/*
164void QtGradientWidgetPrivate::setupDrag(QtGradientStop *stop, int x)
165{
166 m_model->setCurrentStop(stop);
167
168 int viewportX = qRound(toViewport(stop->position()));
169 m_dragOffset = x - viewportX;
170
171 const auto stops = m_stops;
172 m_stops.clear();
173 for (QtGradientStop *s : stops) {
174 if (m_model->isSelected(s) || s == stop) {
175 m_dragStops[s] = s->position() - stop->position();
176 m_stops.append(s);
177 } else {
178 m_dragOriginal[s->position()] = s->color();
179 }
180 }
181 for (QtGradientStop *s : stops) {
182 if (!m_model->isSelected(s))
183 m_stops.append(s);
184 }
185 m_stops.removeAll(stop);
186 m_stops.prepend(stop);
187}
188*/
189////////////////////////////
190
191QtGradientWidget::QtGradientWidget(QWidget *parent)
192 : QWidget(parent), d_ptr(new QtGradientWidgetPrivate)
193{
194 d_ptr->q_ptr = this;
195 d_ptr->m_backgroundCheckered = true;
196 d_ptr->m_handleSize = 20.0;
197 d_ptr->m_gradientType = QGradient::LinearGradient;
198 d_ptr->m_startLinear = QPointF(0, 0);
199 d_ptr->m_endLinear = QPointF(1, 1);
200 d_ptr->m_centralRadial = QPointF(0.5, 0.5);
201 d_ptr->m_focalRadial = QPointF(0.5, 0.5);
202 d_ptr->m_radiusRadial = 0.5;
203 d_ptr->m_centralConical = QPointF(0.5, 0.5);
204 d_ptr->m_angleConical = 0;
205 d_ptr->m_dragHandle = QtGradientWidgetPrivate::NoHandle;
206
207 setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred));
208}
209
210QtGradientWidget::~QtGradientWidget()
211{
212}
213
214QSize QtGradientWidget::sizeHint() const
215{
216 return QSize(176, 176);
217}
218
219QSize QtGradientWidget::minimumSizeHint() const
220{
221 return QSize(128, 128);
222}
223
224int QtGradientWidget::heightForWidth(int w) const
225{
226 return w;
227}
228
229void QtGradientWidget::setBackgroundCheckered(bool checkered)
230{
231 if (d_ptr->m_backgroundCheckered == checkered)
232 return;
233 d_ptr->m_backgroundCheckered = checkered;
234 update();
235}
236
237bool QtGradientWidget::isBackgroundCheckered() const
238{
239 return d_ptr->m_backgroundCheckered;
240}
241
242void QtGradientWidget::mousePressEvent(QMouseEvent *e)
243{
244 if (e->button() != Qt::LeftButton)
245 return;
246
247 QPoint p = e->pos();
248 if (d_ptr->m_gradientType == QGradient::LinearGradient) {
249 QPointF startPoint = d_ptr->toViewport(d_ptr->m_startLinear);
250 double x = p.x() - startPoint.x();
251 double y = p.y() - startPoint.y();
252
253 if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 4) > (x * x + y * y)) {
254 d_ptr->m_dragHandle = QtGradientWidgetPrivate::StartLinearHandle;
255 d_ptr->m_dragOffset = QPointF(x, y);
256 update();
257 return;
258 }
259
260 QPointF endPoint = d_ptr->toViewport(d_ptr->m_endLinear);
261 x = p.x() - endPoint.x();
262 y = p.y() - endPoint.y();
263
264 if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 4) > (x * x + y * y)) {
265 d_ptr->m_dragHandle = QtGradientWidgetPrivate::EndLinearHandle;
266 d_ptr->m_dragOffset = QPointF(x, y);
267 update();
268 return;
269 }
270 } else if (d_ptr->m_gradientType == QGradient::RadialGradient) {
271 QPointF focalPoint = d_ptr->toViewport(d_ptr->m_focalRadial);
272 double x = p.x() - focalPoint.x();
273 double y = p.y() - focalPoint.y();
274
275 if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 9) > (x * x + y * y)) {
276 d_ptr->m_dragHandle = QtGradientWidgetPrivate::FocalRadialHandle;
277 d_ptr->m_dragOffset = QPointF(x, y);
278 update();
279 return;
280 }
281
282 QPointF centralPoint = d_ptr->toViewport(d_ptr->m_centralRadial);
283 x = p.x() - centralPoint.x();
284 y = p.y() - centralPoint.y();
285
286 if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 4) > (x * x + y * y)) {
287 d_ptr->m_dragHandle = QtGradientWidgetPrivate::CentralRadialHandle;
288 d_ptr->m_dragOffset = QPointF(x, y);
289 update();
290 return;
291 }
292
293 QPointF central = d_ptr->toViewport(d_ptr->m_centralRadial);
294 QRectF r = d_ptr->pointRect(central, 2 * d_ptr->m_handleSize / 3);
295 QRectF r1(0, r.y(), size().width(), r.height());
296 QRectF r2(r.x(), 0, r.width(), r.y());
297 QRectF r3(r.x(), r.y() + r.height(), r.width(), size().height() - r.y() - r.height());
298 QPointF pF(p.x(), p.y());
299 if (r1.contains(pF) || r2.contains(pF) || r3.contains(pF)) {
300 x = pF.x() / size().width() - d_ptr->m_centralRadial.x();
301 y = pF.y() / size().height() - d_ptr->m_centralRadial.y();
302 const double clickRadius = hypot(x, y);
303 //d_ptr->m_radiusOffset = d_ptr->m_radiusRadial - clickRadius;
304 d_ptr->m_radiusFactor = d_ptr->m_radiusRadial / clickRadius;
305 if (d_ptr->m_radiusFactor == 0)
306 d_ptr->m_radiusFactor = 1;
307 d_ptr->m_dragRadius = d_ptr->m_radiusRadial;
308 d_ptr->m_dragHandle = QtGradientWidgetPrivate::RadiusRadialHandle;
309 mouseMoveEvent(e);
310 update();
311 return;
312 }
313 } else if (d_ptr->m_gradientType == QGradient::ConicalGradient) {
314 QPointF centralPoint = d_ptr->toViewport(d_ptr->m_centralConical);
315 double x = p.x() - centralPoint.x();
316 double y = p.y() - centralPoint.y();
317
318 if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 4) > (x * x + y * y)) {
319 d_ptr->m_dragHandle = QtGradientWidgetPrivate::CentralConicalHandle;
320 d_ptr->m_dragOffset = QPointF(x, y);
321 update();
322 return;
323 }
324 double radius = size().width();
325 if (size().height() < radius)
326 radius = size().height();
327 radius /= 2;
328 double corr = d_ptr->m_handleSize / 3;
329 radius -= corr;
330 QPointF vp = d_ptr->toViewport(d_ptr->m_centralConical);
331 x = p.x() - vp.x();
332 y = p.y() - vp.y();
333 if (((radius - corr) * (radius - corr) < (x * x + y * y)) &&
334 ((radius + corr) * (radius + corr) > (x * x + y * y))) {
335 QPointF central = d_ptr->toViewport(d_ptr->m_centralConical);
336 QPointF current(e->pos().x(), e->pos().y());
337 x = current.x() - central.x();
338 y = current.y() - central.y();
339 x /= size().width() / 2;
340 y /= size().height() / 2;
341 const double angle = qRadiansToDegrees(atan2(-y, x));
342
343 d_ptr->m_angleOffset = d_ptr->m_angleConical - angle;
344 d_ptr->m_dragAngle = d_ptr->m_angleConical;
345 d_ptr->m_dragHandle = QtGradientWidgetPrivate::AngleConicalHandle;
346 update();
347 return;
348 }
349 }
350}
351
352void QtGradientWidget::mouseReleaseEvent(QMouseEvent *e)
353{
354 Q_UNUSED(e);
355 d_ptr->m_dragHandle = QtGradientWidgetPrivate::NoHandle;
356 update();
357}
358
359void QtGradientWidget::mouseMoveEvent(QMouseEvent *e)
360{
361 if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::NoHandle)
362 return;
363
364 const QPointF newPos = e->position() - d_ptr->m_dragOffset;
365 QPointF newPoint = d_ptr->fromViewport(newPos);
366 if (newPoint.x() < 0)
367 newPoint.setX(0);
368 else if (newPoint.x() > 1)
369 newPoint.setX(1);
370 if (newPoint.y() < 0)
371 newPoint.setY(0);
372 else if (newPoint.y() > 1)
373 newPoint.setY(1);
374
375 if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::StartLinearHandle) {
376 d_ptr->m_startLinear = newPoint;
377 emit startLinearChanged(newPoint);
378 } else if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::EndLinearHandle) {
379 d_ptr->m_endLinear = newPoint;
380 emit endLinearChanged(newPoint);
381 } else if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::CentralRadialHandle) {
382 d_ptr->m_centralRadial = newPoint;
383 emit centralRadialChanged(newPoint);
384 } else if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::FocalRadialHandle) {
385 d_ptr->m_focalRadial = newPoint;
386 emit focalRadialChanged(newPoint);
387 } else if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::RadiusRadialHandle) {
388 QPointF centralPoint = d_ptr->toViewport(d_ptr->m_centralRadial);
389 QPointF pF(e->pos().x(), e->pos().y());
390 double x = pF.x() - centralPoint.x();
391 double y = pF.y() - centralPoint.y();
392
393 if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 4) > (x * x + y * y)) {
394 if (d_ptr->m_radiusRadial != d_ptr->m_dragRadius) {
395 d_ptr->m_radiusRadial = d_ptr->m_dragRadius;
396 emit radiusRadialChanged(d_ptr->m_radiusRadial);
397 }
398 } else {
399 x = pF.x() / size().width() - d_ptr->m_centralRadial.x();
400 y = pF.y() / size().height() - d_ptr->m_centralRadial.y();
401 const double moveRadius = hypot(x, y);
402 //double newRadius = moveRadius + d_ptr->m_radiusOffset;
403 double newRadius = moveRadius * d_ptr->m_radiusFactor;
404 if (newRadius > 2)
405 newRadius = 2;
406 d_ptr->m_radiusRadial = newRadius;
407 emit radiusRadialChanged(d_ptr->m_radiusRadial);
408 }
409 } else if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::CentralConicalHandle) {
410 d_ptr->m_centralConical = newPoint;
411 emit centralConicalChanged(newPoint);
412 } else if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::AngleConicalHandle) {
413 QPointF centralPoint = d_ptr->toViewport(d_ptr->m_centralConical);
414 QPointF pF(e->pos().x(), e->pos().y());
415 double x = pF.x() - centralPoint.x();
416 double y = pF.y() - centralPoint.y();
417
418 if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 4) > (x * x + y * y)) {
419 if (d_ptr->m_angleConical != d_ptr->m_dragAngle) {
420 d_ptr->m_angleConical = d_ptr->m_dragAngle;
421 emit angleConicalChanged(d_ptr->m_angleConical);
422 }
423 } else {
424 QPointF central = d_ptr->toViewport(d_ptr->m_centralConical);
425 QPointF current = pF;
426 x = current.x() - central.x();
427 y = current.y() - central.y();
428 x /= size().width() / 2;
429 y /= size().height() / 2;
430
431 const double angle = qRadiansToDegrees(atan2(-y, x)) + d_ptr->m_angleOffset;
432 d_ptr->setAngleConical(angle);
433 }
434 }
435 update();
436}
437
438void QtGradientWidget::mouseDoubleClickEvent(QMouseEvent *e)
439{
440 mousePressEvent(e);
441}
442
443void QtGradientWidget::paintEvent(QPaintEvent *e)
444{
445 Q_UNUSED(e);
446
447 QPainter p(this);
448
449 if (d_ptr->m_backgroundCheckered) {
450 int pixSize = 40;
451 QPixmap pm(2 * pixSize, 2 * pixSize);
452
453 QPainter pmp(&pm);
454 pmp.fillRect(0, 0, pixSize, pixSize, Qt::white);
455 pmp.fillRect(pixSize, pixSize, pixSize, pixSize, Qt::white);
456 pmp.fillRect(0, pixSize, pixSize, pixSize, Qt::black);
457 pmp.fillRect(pixSize, 0, pixSize, pixSize, Qt::black);
458
459 p.setBrushOrigin((size().width() % pixSize + pixSize) / 2, (size().height() % pixSize + pixSize) / 2);
460 p.fillRect(rect(), pm);
461 p.setBrushOrigin(0, 0);
462 }
463
464 QGradient *gradient = nullptr;
465 switch (d_ptr->m_gradientType) {
466 case QGradient::LinearGradient:
467 gradient = new QLinearGradient(d_ptr->m_startLinear, d_ptr->m_endLinear);
468 break;
469 case QGradient::RadialGradient:
470 gradient = new QRadialGradient(d_ptr->m_centralRadial, d_ptr->m_radiusRadial, d_ptr->m_focalRadial);
471 break;
472 case QGradient::ConicalGradient:
473 gradient = new QConicalGradient(d_ptr->m_centralConical, d_ptr->m_angleConical);
474 break;
475 default:
476 break;
477 }
478 if (!gradient)
479 return;
480
481 gradient->setStops(d_ptr->m_gradientStops);
482 gradient->setSpread(d_ptr->m_gradientSpread);
483
484 p.save();
485 p.scale(size().width(), size().height());
486 p.fillRect(QRect(0, 0, 1, 1), *gradient);
487 p.restore();
488
489 p.setRenderHint(QPainter::Antialiasing);
490
491 QColor c = QColor::fromRgbF(0.5, 0.5, 0.5, 0.5);
492 QBrush br(c);
493 p.setBrush(br);
494 QPen pen(Qt::white);
495 pen.setWidthF(1);
496 p.setPen(pen);
497 QPen dragPen = pen;
498 dragPen.setWidthF(2);
499 if (d_ptr->m_gradientType == QGradient::LinearGradient) {
500 p.save();
501 if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::StartLinearHandle)
502 p.setPen(dragPen);
503 d_ptr->paintPoint(&p, d_ptr->m_startLinear, d_ptr->m_handleSize);
504 p.restore();
505
506 p.save();
507 if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::EndLinearHandle)
508 p.setPen(dragPen);
509 d_ptr->paintPoint(&p, d_ptr->m_endLinear, d_ptr->m_handleSize);
510 p.restore();
511 } else if (d_ptr->m_gradientType == QGradient::RadialGradient) {
512 QPointF central = d_ptr->toViewport(d_ptr->m_centralRadial);
513
514 p.save();
515 QRectF r = d_ptr->pointRect(central, 2 * d_ptr->m_handleSize / 3);
516 QRectF r1(0, r.y(), size().width(), r.height());
517 QRectF r2(r.x(), 0, r.width(), r.y());
518 QRectF r3(r.x(), r.y() + r.height(), r.width(), size().height() - r.y() - r.height());
519 p.fillRect(r1, c);
520 p.fillRect(r2, c);
521 p.fillRect(r3, c);
522 p.setBrush(Qt::NoBrush);
523 p.save();
524 if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::CentralRadialHandle)
525 p.setPen(dragPen);
526 d_ptr->paintPoint(&p, d_ptr->m_centralRadial, d_ptr->m_handleSize);
527 p.restore();
528
529 const QRectF rect = QRectF(central.x() - d_ptr->m_radiusRadial * size().width(),
530 central.y() - d_ptr->m_radiusRadial * size().height(),
531 2 * d_ptr->m_radiusRadial * size().width(),
532 2 * d_ptr->m_radiusRadial * size().height());
533 QRegion region(r1.toRect());
534 region += r2.toRect();
535 region += r3.toRect();
536 p.setClipRegion(region);
537
538 p.drawEllipse(rect);
539 if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::RadiusRadialHandle) {
540 p.save();
541 p.setPen(dragPen);
542 QRectF rect = QRectF(central.x() - d_ptr->m_radiusRadial / d_ptr->m_radiusFactor * size().width(),
543 central.y() - d_ptr->m_radiusRadial / d_ptr->m_radiusFactor * size().height(),
544 2 * d_ptr->m_radiusRadial / d_ptr->m_radiusFactor * size().width(),
545 2 * d_ptr->m_radiusRadial / d_ptr->m_radiusFactor * size().height());
546 p.drawEllipse(rect);
547
548 p.restore();
549 }
550 p.restore();
551
552 p.save();
553 if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::FocalRadialHandle)
554 p.setPen(dragPen);
555 d_ptr->paintPoint(&p, d_ptr->m_focalRadial, 2 * d_ptr->m_handleSize / 3);
556 p.restore();
557 } else if (d_ptr->m_gradientType == QGradient::ConicalGradient) {
558 double radius = size().width();
559 if (size().height() < radius)
560 radius = size().height();
561 radius /= 2;
562 double corr = d_ptr->m_handleSize / 3;
563 radius -= corr;
564 QPointF central = d_ptr->toViewport(d_ptr->m_centralConical);
565
566 p.save();
567 p.setBrush(Qt::NoBrush);
568 QPen pen2(c);
569 pen2.setWidthF(2 * d_ptr->m_handleSize / 3);
570 p.setPen(pen2);
571 p.drawEllipse(d_ptr->pointRect(central, 2 * radius));
572 p.restore();
573
574 p.save();
575 p.setBrush(Qt::NoBrush);
576 int pointCount = 2;
577 for (int i = 0; i < pointCount; i++) {
578 const qreal angle = qDegreesToRadians(i * 180.0 / pointCount + d_ptr->m_angleConical);
579 const QPointF ray(qCos(angle) * size().width() / 2,
580 -qSin(angle) * size().height() / 2);
581 const double mod = hypot(ray.x(), ray.y());
582 p.drawLine(QPointF(central.x() + ray.x() * (radius - corr) / mod,
583 central.y() + ray.y() * (radius - corr) / mod),
584 QPointF(central.x() + ray.x() * (radius + corr) / mod,
585 central.y() + ray.y() * (radius + corr) / mod));
586 p.drawLine(QPointF(central.x() - ray.x() * (radius - corr) / mod,
587 central.y() - ray.y() * (radius - corr) / mod),
588 QPointF(central.x() - ray.x() * (radius + corr) / mod,
589 central.y() - ray.y() * (radius + corr) / mod));
590 }
591 if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::AngleConicalHandle) {
592 p.save();
593 p.setPen(dragPen);
594 const qreal angle = qDegreesToRadians(d_ptr->m_angleConical - d_ptr->m_angleOffset);
595 const QPointF ray(qCos(angle) * size().width() / 2,
596 -qSin(angle) * size().height() / 2);
597 const double mod = hypot(ray.x(), ray.y());
598 p.drawLine(QPointF(central.x() + ray.x() * (radius - corr) / mod,
599 central.y() + ray.y() * (radius - corr) / mod),
600 QPointF(central.x() + ray.x() * (radius + corr) / mod,
601 central.y() + ray.y() * (radius + corr) / mod));
602 p.restore();
603 }
604
605 p.restore();
606
607 p.save();
608 if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::CentralConicalHandle)
609 p.setPen(dragPen);
610 d_ptr->paintPoint(&p, d_ptr->m_centralConical, d_ptr->m_handleSize);
611 p.restore();
612
613 }
614
615 delete gradient;
616}
617
618void QtGradientWidget::setGradientStops(const QGradientStops &stops)
619{
620 d_ptr->m_gradientStops = stops;
621 update();
622}
623
624QGradientStops QtGradientWidget::gradientStops() const
625{
626 return d_ptr->m_gradientStops;
627}
628
629void QtGradientWidget::setGradientType(QGradient::Type type)
630{
631 if (type == QGradient::NoGradient)
632 return;
633 if (d_ptr->m_gradientType == type)
634 return;
635
636 d_ptr->m_gradientType = type;
637 update();
638}
639
640QGradient::Type QtGradientWidget::gradientType() const
641{
642 return d_ptr->m_gradientType;
643}
644
645void QtGradientWidget::setGradientSpread(QGradient::Spread spread)
646{
647 if (d_ptr->m_gradientSpread == spread)
648 return;
649
650 d_ptr->m_gradientSpread = spread;
651 update();
652}
653
654QGradient::Spread QtGradientWidget::gradientSpread() const
655{
656 return d_ptr->m_gradientSpread;
657}
658
659void QtGradientWidget::setStartLinear(QPointF point)
660{
661 if (d_ptr->m_startLinear == point)
662 return;
663
664 d_ptr->m_startLinear = d_ptr->checkRange(point);
665 update();
666}
667
668QPointF QtGradientWidget::startLinear() const
669{
670 return d_ptr->m_startLinear;
671}
672
673void QtGradientWidget::setEndLinear(QPointF point)
674{
675 if (d_ptr->m_endLinear == point)
676 return;
677
678 d_ptr->m_endLinear = d_ptr->checkRange(point);
679 update();
680}
681
682QPointF QtGradientWidget::endLinear() const
683{
684 return d_ptr->m_endLinear;
685}
686
687void QtGradientWidget::setCentralRadial(QPointF point)
688{
689 if (d_ptr->m_centralRadial == point)
690 return;
691
692 d_ptr->m_centralRadial = point;
693 update();
694}
695
696QPointF QtGradientWidget::centralRadial() const
697{
698 return d_ptr->m_centralRadial;
699}
700
701void QtGradientWidget::setFocalRadial(QPointF point)
702{
703 if (d_ptr->m_focalRadial == point)
704 return;
705
706 d_ptr->m_focalRadial = point;
707 update();
708}
709
710QPointF QtGradientWidget::focalRadial() const
711{
712 return d_ptr->m_focalRadial;
713}
714
715void QtGradientWidget::setRadiusRadial(qreal radius)
716{
717 if (d_ptr->m_radiusRadial == radius)
718 return;
719
720 d_ptr->m_radiusRadial = radius;
721 update();
722}
723
724qreal QtGradientWidget::radiusRadial() const
725{
726 return d_ptr->m_radiusRadial;
727}
728
729void QtGradientWidget::setCentralConical(QPointF point)
730{
731 if (d_ptr->m_centralConical == point)
732 return;
733
734 d_ptr->m_centralConical = point;
735 update();
736}
737
738QPointF QtGradientWidget::centralConical() const
739{
740 return d_ptr->m_centralConical;
741}
742
743void QtGradientWidget::setAngleConical(qreal angle)
744{
745 if (d_ptr->m_angleConical == angle)
746 return;
747
748 d_ptr->m_angleConical = angle;
749 update();
750}
751
752qreal QtGradientWidget::angleConical() const
753{
754 return d_ptr->m_angleConical;
755}
756
757QT_END_NAMESPACE
QtGradientWidgetPrivate::checkRange
QPointF checkRange(QPointF point) const
Definition qtgradientwidget.cpp:95
QtGradientWidgetPrivate::toViewport
QPointF toViewport(QPointF point) const
Definition qtgradientwidget.cpp:115
QtGradientWidgetPrivate::m_gradientSpread
QGradient::Spread m_gradientSpread
Definition qtgradientwidget.cpp:42
QtGradientWidgetPrivate::paintPoint
void paintPoint(QPainter *painter, QPointF point, double size) const
Definition qtgradientwidget.cpp:121
QtGradientWidgetPrivate::setAngleConical
void setAngleConical(double angle)
Definition qtgradientwidget.cpp:81
QtGradientWidgetPrivate::pointRect
QRectF pointRect(QPointF point, double size) const
Definition qtgradientwidget.cpp:90
QtGradientWidgetPrivate::correctAngle
double correctAngle(double angle) const
Definition qtgradientwidget.cpp:71
QT_BEGIN_NAMESPACE
Combined button and popup list for selecting options.
Definition qstandardpaths_haiku.cpp:21
qRadiansToDegrees
constexpr double qRadiansToDegrees(double radians)
Definition qmath.h:286