1 /***************************************************************************
2 * Copyright (C) 2010 by Till Theato (root@ttill.de) *
3 * This file is part of Kdenlive (www.kdenlive.org). *
5 * Kdenlive is free software: you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation, either version 2 of the License, or *
8 * (at your option) any later version. *
10 * Kdenlive is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 * You should have received a copy of the GNU General Public License *
16 * along with Kdenlive. If not, see <http://www.gnu.org/licenses/>. *
17 ***************************************************************************/
19 #include "beziersplineeditor.h"
20 #include "kdenlivesettings.h"
23 #include <QMouseEvent>
26 BezierSplineEditor::BezierSplineEditor(QWidget* parent) :
31 , m_showAllHandles(true)
33 , m_pixmapIsDirty(true)
34 , m_currentPointIndex(-1)
35 , m_currentPointType(PTypeP)
39 setMouseTracking(true);
40 setAutoFillBackground(false);
41 setAttribute(Qt::WA_OpaquePaintEvent);
42 setMinimumSize(150, 150);
43 setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
46 BezierSplineEditor::~BezierSplineEditor()
51 CubicBezierSpline BezierSplineEditor::spline() const
56 void BezierSplineEditor::setSpline(const CubicBezierSpline& spline)
59 m_currentPointIndex = -1;
61 emit currentPoint(BPoint());
66 BPoint BezierSplineEditor::getCurrentPoint()
68 if (m_currentPointIndex >= 0)
69 return m_spline.getPoint(m_currentPointIndex);
74 void BezierSplineEditor::updateCurrentPoint(const BPoint& p, bool final)
76 if (m_currentPointIndex >= 0) {
77 m_spline.setPoint(m_currentPointIndex, p);
78 // during validation the point might have changed
79 emit currentPoint(m_spline.getPoint(m_currentPointIndex));
86 void BezierSplineEditor::setPixmap(const QPixmap& pixmap)
89 m_pixmapIsDirty = true;
93 void BezierSplineEditor::slotZoomIn()
95 m_zoomLevel = qMax(m_zoomLevel-1, 0);
96 m_pixmapIsDirty = true;
100 void BezierSplineEditor::slotZoomOut()
102 m_zoomLevel = qMin(m_zoomLevel+1, 3);
103 m_pixmapIsDirty = true;
107 void BezierSplineEditor::setShowAllHandles(bool show)
109 if (m_showAllHandles != show) {
110 m_showAllHandles = show;
115 int BezierSplineEditor::gridLines() const
120 void BezierSplineEditor::setGridLines(int lines)
122 m_gridLines = qBound(0, lines, 8);
126 void BezierSplineEditor::paintEvent(QPaintEvent* event)
135 int wWidth = width() - 1;
136 int wHeight = height() - 1;
137 int offsetX = 1/8. * m_zoomLevel * wWidth;
138 int offsetY = 1/8. * m_zoomLevel * wHeight;
139 wWidth -= 2 * offsetX;
140 wHeight -= 2 * offsetY;
142 p.translate(offsetX, offsetY);
147 p.fillRect(rect().translated(-offsetX, -offsetY), palette().background());
148 if (!m_pixmap.isNull()) {
149 if (m_pixmapIsDirty || !m_pixmapCache) {
151 delete m_pixmapCache;
152 m_pixmapCache = new QPixmap(wWidth + 1, wHeight + 1);
153 QPainter cachePainter(m_pixmapCache);
155 cachePainter.scale(1.0*(wWidth+1) / m_pixmap.width(), 1.0*(wHeight+1) / m_pixmap.height());
156 cachePainter.drawPixmap(0, 0, m_pixmap);
157 m_pixmapIsDirty = false;
159 p.drawPixmap(0, 0, *m_pixmapCache);
163 p.setPen(QPen(Qt::gray, 1, Qt::SolidLine));
168 if (m_zoomLevel != 0) {
169 p.drawRect(0, 0, wWidth, wHeight);
175 if (m_gridLines != 0) {
176 double stepH = wWidth / (double)(m_gridLines + 1);
177 double stepV = wHeight / (double)(m_gridLines + 1);
178 for (int i = 1; i <= m_gridLines; ++i) {
179 p.drawLine(QLineF(i * stepH, 0, i * stepH, wHeight));
180 p.drawLine(QLineF(0, i * stepV, wWidth, i * stepV));
184 p.setRenderHint(QPainter::Antialiasing);
189 p.drawLine(QLineF(0, wHeight, wWidth, 0));
193 * Prepare Spline, Points
195 int max = m_spline.points().count() - 1;
198 BPoint point(m_spline.getPoint(0, wWidth, wHeight, true));
205 QPainterPath splinePath(QPointF(point.p.x(), point.p.y()));
206 for (int i = 0; i < max; ++i) {
207 point = m_spline.getPoint(i, wWidth, wHeight, true);
208 next = m_spline.getPoint(i + 1, wWidth, wHeight, true);
209 splinePath.cubicTo(point.h2, next.h1, next.p);
211 p.setPen(QPen(Qt::black, 1, Qt::SolidLine));
212 p.drawPath(splinePath);
218 p.setPen(QPen(Qt::red, 1, Qt::SolidLine));
220 QPolygonF handle = QPolygonF() << QPointF(0, -3) << QPointF(3, 0) << QPointF(0, 3) << QPointF(-3, 0);
221 #if QT_VERSION < 0x040600
225 for (int i = 0; i <= max; ++i) {
226 point = m_spline.getPoint(i, wWidth, wHeight, true);
228 if (i == m_currentPointIndex) {
229 // selected point: fill p and handles
230 p.setBrush(QBrush(QColor(Qt::red), Qt::SolidPattern));
231 // connect p and handles with lines
233 p.drawLine(QLineF(point.h1.x(), point.h1.y(), point.p.x(),point.p.y()));
235 p.drawLine(QLineF(point.p.x(), point.p.y(), point.h2.x(), point.h2.y()));
238 p.drawEllipse(QRectF(point.p.x() - 3,
239 point.p.y() - 3, 6, 6));
240 if (i != 0 && (i == m_currentPointIndex || m_showAllHandles)) {
241 #if QT_VERSION >= 0x040600
242 p.drawConvexPolygon(handle.translated(point.h1.x(), point.h1.y()));
245 tmp.translate(point.h1.x(), point.h1.y());
246 p.drawConvexPolygon(tmp);
249 if (i != max && (i == m_currentPointIndex || m_showAllHandles)) {
250 #if QT_VERSION >= 0x040600
251 p.drawConvexPolygon(handle.translated(point.h2.x(), point.h2.y()));
254 tmp.translate(point.h2.x(), point.h2.y());
255 p.drawConvexPolygon(tmp);
259 if ( i == m_currentPointIndex)
260 p.setBrush(QBrush(Qt::NoBrush));
264 void BezierSplineEditor::resizeEvent(QResizeEvent* event)
266 m_pixmapIsDirty = true;
267 QWidget::resizeEvent(event);
270 void BezierSplineEditor::mousePressEvent(QMouseEvent* event)
272 int wWidth = width() - 1;
273 int wHeight = height() - 1;
274 int offsetX = 1/8. * m_zoomLevel * wWidth;
275 int offsetY = 1/8. * m_zoomLevel * wHeight;
276 wWidth -= 2 * offsetX;
277 wHeight -= 2 * offsetY;
279 double x = (event->pos().x() - offsetX) / (double)(wWidth);
280 double y = 1.0 - (event->pos().y() - offsetY) / (double)(wHeight);
282 point_types selectedPoint;
283 int closestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &selectedPoint);
285 if (event->button() == Qt::RightButton && closestPointIndex > 0 && closestPointIndex < m_spline.points().count() - 1 && selectedPoint == PTypeP) {
286 m_spline.removePoint(closestPointIndex);
287 setCursor(Qt::ArrowCursor);
289 if (closestPointIndex < m_currentPointIndex)
290 --m_currentPointIndex;
292 if (m_currentPointIndex >= 0)
293 emit currentPoint(m_spline.getPoint(m_currentPointIndex));
295 emit currentPoint(BPoint());
298 } else if (event->button() != Qt::LeftButton) {
302 if (closestPointIndex < 0) {
303 m_currentPointIndex = m_spline.addPoint(BPoint(QPointF(x-0.05, y-0.05),
305 QPointF(x+0.05, y+0.05)));
306 m_currentPointType = PTypeP;
308 m_currentPointIndex = closestPointIndex;
309 m_currentPointType = selectedPoint;
312 BPoint point = m_spline.getPoint(m_currentPointIndex);
314 m_grabPOriginal = point;
315 if (m_currentPointIndex > 0)
316 m_grabPPrevious = m_spline.getPoint(m_currentPointIndex - 1);
317 if (m_currentPointIndex < m_spline.points().count() - 1)
318 m_grabPNext = m_spline.getPoint(m_currentPointIndex + 1);
319 m_grabOffsetX = point[(int)m_currentPointType].x() - x;
320 m_grabOffsetY = point[(int)m_currentPointType].y() - y;
322 point[(int)m_currentPointType] = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
324 m_spline.setPoint(m_currentPointIndex, point);
328 emit currentPoint(point);
332 void BezierSplineEditor::mouseReleaseEvent(QMouseEvent* event)
334 if (event->button() != Qt::LeftButton)
337 setCursor(Qt::ArrowCursor);
343 void BezierSplineEditor::mouseMoveEvent(QMouseEvent* event)
345 int wWidth = width() - 1;
346 int wHeight = height() - 1;
347 int offsetX = 1/8. * m_zoomLevel * wWidth;
348 int offsetY = 1/8. * m_zoomLevel * wHeight;
349 wWidth -= 2 * offsetX;
350 wHeight -= 2 * offsetY;
352 double x = (event->pos().x() - offsetX) / (double)(wWidth);
353 double y = 1.0 - (event->pos().y() - offsetY) / (double)(wHeight);
355 if (m_mode == ModeNormal) {
356 // If no point is selected set the the cursor shape if on top
358 int nearestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &type);
360 if (nearestPointIndex < 0)
361 setCursor(Qt::ArrowCursor);
363 setCursor(Qt::CrossCursor);
365 // Else, drag the selected point
366 setCursor(Qt::CrossCursor);
373 BPoint point = m_spline.getPoint(m_currentPointIndex);
374 switch (m_currentPointType) {
376 rightX = point.p.x();
377 if (m_currentPointIndex == 0)
380 leftX = m_spline.getPoint(m_currentPointIndex - 1).p.x();
382 x = qBound(leftX, x, rightX);
383 point.setH1(QPointF(x, y));
387 if (m_currentPointIndex == 0)
389 else if (m_currentPointIndex == m_spline.points().count() - 1)
392 x = qBound(leftX, x, rightX);
393 y = qBound(0., y, 1.);
395 // handles might have changed because we neared another point
397 point.h1 = m_grabPOriginal.h1;
398 point.h2 = m_grabPOriginal.h2;
399 // and move by same offset
400 // (using update handle in point.setP won't work because the offset between new and old point is very small)
401 point.h1 += QPointF(x, y) - m_grabPOriginal.p;
402 point.h2 += QPointF(x, y) - m_grabPOriginal.p;
404 point.setP(QPointF(x, y), false);
409 if (m_currentPointIndex == m_spline.points().count() - 1)
412 rightX = m_spline.getPoint(m_currentPointIndex + 1).p.x();
414 x = qBound(leftX, x, rightX);
415 point.setH2(QPointF(x, y));
418 int index = m_currentPointIndex;
419 m_currentPointIndex = m_spline.setPoint(m_currentPointIndex, point);
421 if (m_currentPointType == PTypeP) {
422 // we might have changed the handles of other points
424 if (index == m_currentPointIndex) {
425 if (m_currentPointIndex > 0)
426 m_spline.setPoint(m_currentPointIndex - 1, m_grabPPrevious);
427 if (m_currentPointIndex < m_spline.points().count() -1)
428 m_spline.setPoint(m_currentPointIndex + 1, m_grabPNext);
430 if (m_currentPointIndex < index) {
431 m_spline.setPoint(index, m_grabPPrevious);
432 m_grabPNext = m_grabPPrevious;
433 if (m_currentPointIndex > 0)
434 m_grabPPrevious = m_spline.getPoint(m_currentPointIndex - 1);
436 m_spline.setPoint(index, m_grabPNext);
437 m_grabPPrevious = m_grabPNext;
438 if (m_currentPointIndex < m_spline.points().count() - 1)
439 m_grabPNext = m_spline.getPoint(m_currentPointIndex + 1);
444 emit currentPoint(point);
445 if (KdenliveSettings::dragvalue_directupdate())
451 void BezierSplineEditor::mouseDoubleClickEvent(QMouseEvent* /*event*/)
453 if (m_currentPointIndex >= 0) {
454 BPoint p = m_spline.getPoint(m_currentPointIndex);
455 p.handlesLinked = !p.handlesLinked;
456 m_spline.setPoint(m_currentPointIndex, p);
457 emit currentPoint(p);
461 void BezierSplineEditor::leaveEvent(QEvent* event)
463 QWidget::leaveEvent(event);
466 int BezierSplineEditor::nearestPointInRange(const QPointF &p, int wWidth, int wHeight, BezierSplineEditor::point_types* sel)
468 double nearestDistanceSquared = 1000;
469 point_types selectedPoint = PTypeP;
470 int nearestIndex = -1;
473 double distanceSquared;
474 // find out distance using the Pythagorean theorem
475 foreach(const BPoint & point, m_spline.points()) {
476 for (int j = 0; j < 3; ++j) {
477 distanceSquared = pow(point[j].x() - p.x(), 2) + pow(point[j].y() - p.y(), 2);
478 if (distanceSquared < nearestDistanceSquared) {
480 nearestDistanceSquared = distanceSquared;
481 selectedPoint = (point_types)j;
487 if (nearestIndex >= 0 && (nearestIndex == m_currentPointIndex || selectedPoint == PTypeP || m_showAllHandles)) {
488 // a point was found and it is not a hidden handle
489 BPoint point = m_spline.getPoint(nearestIndex);
490 if (qAbs(p.x() - point[(int)selectedPoint].x()) * wWidth < 5 && qAbs(p.y() - point[(int)selectedPoint].y()) * wHeight < 5) {
491 *sel = selectedPoint;
499 #include "beziersplineeditor.moc"