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"
22 #include <QMouseEvent>
25 BezierSplineEditor::BezierSplineEditor(QWidget* parent) :
30 m_showAllHandles(true),
32 m_pixmapIsDirty(true),
33 m_currentPointIndex(-1)
35 setMouseTracking(true);
36 setAutoFillBackground(false);
37 setAttribute(Qt::WA_OpaquePaintEvent);
38 setMinimumSize(150, 150);
39 setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
42 BezierSplineEditor::~BezierSplineEditor()
48 CubicBezierSpline BezierSplineEditor::spline()
53 void BezierSplineEditor::setSpline(const CubicBezierSpline& spline)
56 m_currentPointIndex = -1;
58 emit currentPoint(BPoint());
63 BPoint BezierSplineEditor::getCurrentPoint()
65 if (m_currentPointIndex >= 0)
66 return m_spline.points()[m_currentPointIndex];
71 void BezierSplineEditor::updateCurrentPoint(const BPoint& p)
73 if (m_currentPointIndex >= 0) {
74 m_spline.setPoint(m_currentPointIndex, p);
75 // during validation the point might have changed
76 emit currentPoint(m_spline.points()[m_currentPointIndex]);
82 void BezierSplineEditor::setPixmap(const QPixmap& pixmap)
85 m_pixmapIsDirty = true;
89 void BezierSplineEditor::slotZoomIn()
91 m_zoomLevel = qMax(m_zoomLevel-1, 0);
92 m_pixmapIsDirty = true;
96 void BezierSplineEditor::slotZoomOut()
98 m_zoomLevel = qMin(m_zoomLevel+1, 3);
99 m_pixmapIsDirty = true;
103 void BezierSplineEditor::setShowAllHandles(bool show)
105 m_showAllHandles = show;
109 int BezierSplineEditor::gridLines()
114 void BezierSplineEditor::setGridLines(int lines)
116 m_gridLines = qBound(0, lines, 8);
120 void BezierSplineEditor::paintEvent(QPaintEvent* event)
129 int wWidth = width() - 1;
130 int wHeight = height() - 1;
131 int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
132 wWidth -= 2 * offset;
133 wHeight -= 2 * offset;
135 p.translate(offset, offset);
140 p.fillRect(rect().translated(-offset, -offset), palette().background());
141 if (!m_pixmap.isNull()) {
142 if (m_pixmapIsDirty || !m_pixmapCache) {
144 delete m_pixmapCache;
145 m_pixmapCache = new QPixmap(wWidth + 1, wHeight + 1);
146 QPainter cachePainter(m_pixmapCache);
148 cachePainter.scale(1.0*(wWidth+1) / m_pixmap.width(), 1.0*(wHeight+1) / m_pixmap.height());
149 cachePainter.drawPixmap(0, 0, m_pixmap);
150 m_pixmapIsDirty = false;
152 p.drawPixmap(0, 0, *m_pixmapCache);
156 p.setPen(QPen(Qt::gray, 1, Qt::SolidLine));
161 if (m_zoomLevel != 0) {
162 p.drawRect(0, 0, wWidth, wHeight);
168 if (m_gridLines != 0) {
169 double stepH = wWidth / (double)(m_gridLines + 1);
170 double stepV = wHeight / (double)(m_gridLines + 1);
171 for (int i = 1; i <= m_gridLines; ++i) {
172 p.drawLine(QLineF(i * stepH, 0, i * stepH, wHeight));
173 p.drawLine(QLineF(0, i * stepV, wWidth, i * stepV));
177 p.setRenderHint(QPainter::Antialiasing);
182 p.drawLine(QLineF(0, wHeight, wWidth, 0));
186 * Prepare Spline, Points
188 int max = m_spline.points().count() - 1;
191 BPoint point(m_spline.getPoint(0, wWidth, wHeight, true));
198 QPainterPath splinePath(QPointF(point.p.x(), point.p.y()));
199 for (int i = 0; i < max; ++i) {
200 point = m_spline.getPoint(i, wWidth, wHeight, true);
201 next = m_spline.getPoint(i + 1, wWidth, wHeight, true);
202 splinePath.cubicTo(point.h2, next.h1, next.p);
204 p.setPen(QPen(Qt::black, 1, Qt::SolidLine));
205 p.drawPath(splinePath);
211 p.setPen(QPen(Qt::red, 1, Qt::SolidLine));
213 QPolygonF handle = QPolygonF() << QPointF(0, -3) << QPointF(3, 0) << QPointF(0, 3) << QPointF(-3, 0);
214 #if QT_VERSION < 0x040600
218 for (int i = 0; i <= max; ++i) {
219 point = m_spline.getPoint(i, wWidth, wHeight, true);
221 if (i == m_currentPointIndex) {
222 // selected point: fill p and handles
223 p.setBrush(QBrush(QColor(Qt::red), Qt::SolidPattern));
224 // connect p and handles with lines
226 p.drawLine(QLineF(point.h1.x(), point.h1.y(), point.p.x(),point.p.y()));
228 p.drawLine(QLineF(point.p.x(), point.p.y(), point.h2.x(), point.h2.y()));
231 p.drawEllipse(QRectF(point.p.x() - 3,
232 point.p.y() - 3, 6, 6));
233 if (i != 0 && (i == m_currentPointIndex || m_showAllHandles)) {
234 #if QT_VERSION >= 0x040600
235 p.drawConvexPolygon(handle.translated(point.h1.x(), point.h1.y()));
238 tmp.translate(point.h1.x(), point.h1.y());
239 p.drawConvexPolygon(tmp);
242 if (i != max && (i == m_currentPointIndex || m_showAllHandles)) {
243 #if QT_VERSION >= 0x040600
244 p.drawConvexPolygon(handle.translated(point.h2.x(), point.h2.y()));
247 tmp.translate(point.h2.x(), point.h2.y());
248 p.drawConvexPolygon(tmp);
252 if ( i == m_currentPointIndex)
253 p.setBrush(QBrush(Qt::NoBrush));
257 void BezierSplineEditor::resizeEvent(QResizeEvent* event)
259 m_pixmapIsDirty = true;
260 QWidget::resizeEvent(event);
263 void BezierSplineEditor::mousePressEvent(QMouseEvent* event)
265 int wWidth = width() - 1;
266 int wHeight = height() - 1;
267 int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
268 wWidth -= 2 * offset;
269 wHeight -= 2 * offset;
271 double x = (event->pos().x() - offset) / (double)(wWidth);
272 double y = 1.0 - (event->pos().y() - offset) / (double)(wHeight);
274 point_types selectedPoint;
275 int closestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &selectedPoint);
277 if (event->button() == Qt::RightButton && closestPointIndex > 0 && closestPointIndex < m_spline.points().count() - 1 && selectedPoint == PTypeP) {
278 m_spline.removePoint(closestPointIndex);
279 setCursor(Qt::ArrowCursor);
281 if (closestPointIndex < m_currentPointIndex)
282 --m_currentPointIndex;
284 if (m_currentPointIndex >= 0)
285 emit currentPoint(m_spline.points()[m_currentPointIndex]);
287 emit currentPoint(BPoint());
290 } else if (event->button() != Qt::LeftButton) {
294 if (closestPointIndex < 0) {
295 m_currentPointIndex = m_spline.addPoint(BPoint(QPointF(x-0.05, y-0.05),
297 QPointF(x+0.05, y+0.05)));
298 m_currentPointType = PTypeP;
300 m_currentPointIndex = closestPointIndex;
301 m_currentPointType = selectedPoint;
304 BPoint point = m_spline.points()[m_currentPointIndex];
306 m_grabPOriginal = point;
307 if (m_currentPointIndex > 0)
308 m_grabPPrevious = m_spline.points()[m_currentPointIndex - 1];
309 if (m_currentPointIndex < m_spline.points().count() - 1)
310 m_grabPNext = m_spline.points()[m_currentPointIndex + 1];
311 m_grabOffsetX = point[(int)m_currentPointType].x() - x;
312 m_grabOffsetY = point[(int)m_currentPointType].y() - y;
314 point[(int)m_currentPointType] = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
316 m_spline.setPoint(m_currentPointIndex, point);
320 emit currentPoint(point);
324 void BezierSplineEditor::mouseReleaseEvent(QMouseEvent* event)
326 if (event->button() != Qt::LeftButton)
329 setCursor(Qt::ArrowCursor);
335 void BezierSplineEditor::mouseMoveEvent(QMouseEvent* event)
337 int wWidth = width() - 1;
338 int wHeight = height() - 1;
339 int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
340 wWidth -= 2 * offset;
341 wHeight -= 2 * offset;
343 double x = (event->pos().x() - offset) / (double)(wWidth);
344 double y = 1.0 - (event->pos().y() - offset) / (double)(wHeight);
346 if (m_mode == ModeNormal) {
347 // If no point is selected set the the cursor shape if on top
349 int nearestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &type);
351 if (nearestPointIndex < 0)
352 setCursor(Qt::ArrowCursor);
354 setCursor(Qt::CrossCursor);
356 // Else, drag the selected point
357 setCursor(Qt::CrossCursor);
364 BPoint point = m_spline.points()[m_currentPointIndex];
365 switch (m_currentPointType) {
367 rightX = point.p.x();
368 if (m_currentPointIndex == 0)
371 leftX = m_spline.points()[m_currentPointIndex - 1].p.x();
373 x = qBound(leftX, x, rightX);
374 point.setH1(QPointF(x, y));
378 if (m_currentPointIndex == 0)
380 else if (m_currentPointIndex == m_spline.points().count() - 1)
383 x = qBound(leftX, x, rightX);
384 y = qBound(0., y, 1.);
386 // handles might have changed because we neared another point
388 point.h1 = m_grabPOriginal.h1;
389 point.h2 = m_grabPOriginal.h2;
390 // and move by same offset
391 // (using update handle in point.setP won't work because the offset between new and old point is very small)
392 point.h1 += QPointF(x, y) - m_grabPOriginal.p;
393 point.h2 += QPointF(x, y) - m_grabPOriginal.p;
395 point.setP(QPointF(x, y), false);
400 if (m_currentPointIndex == m_spline.points().count() - 1)
403 rightX = m_spline.points()[m_currentPointIndex + 1].p.x();
405 x = qBound(leftX, x, rightX);
406 point.setH2(QPointF(x, y));
409 int index = m_currentPointIndex;
410 m_currentPointIndex = m_spline.setPoint(m_currentPointIndex, point);
412 if (m_currentPointType == PTypeP) {
413 // we might have changed the handles of other points
415 if (index == m_currentPointIndex) {
416 if (m_currentPointIndex > 0)
417 m_spline.setPoint(m_currentPointIndex - 1, m_grabPPrevious);
418 if (m_currentPointIndex < m_spline.points().count() -1)
419 m_spline.setPoint(m_currentPointIndex + 1, m_grabPNext);
421 if (m_currentPointIndex < index) {
422 m_spline.setPoint(index, m_grabPPrevious);
423 m_grabPNext = m_grabPPrevious;
424 if (m_currentPointIndex > 0)
425 m_grabPPrevious = m_spline.points()[m_currentPointIndex - 1];
427 m_spline.setPoint(index, m_grabPNext);
428 m_grabPPrevious = m_grabPNext;
429 if (m_currentPointIndex < m_spline.points().count() - 1)
430 m_grabPNext = m_spline.points()[m_currentPointIndex + 1];
435 emit currentPoint(point);
440 void BezierSplineEditor::leaveEvent(QEvent* event)
442 QWidget::leaveEvent(event);
445 int BezierSplineEditor::nearestPointInRange(QPointF p, int wWidth, int wHeight, BezierSplineEditor::point_types* sel)
447 double nearestDistanceSquared = 1000;
448 point_types selectedPoint;
449 int nearestIndex = -1;
452 double distanceSquared;
453 // find out distance using the Pythagorean theorem
454 foreach(const BPoint & point, m_spline.points()) {
455 for (int j = 0; j < 3; ++j) {
456 distanceSquared = pow(point[j].x() - p.x(), 2) + pow(point[j].y() - p.y(), 2);
457 if (distanceSquared < nearestDistanceSquared) {
459 nearestDistanceSquared = distanceSquared;
460 selectedPoint = (point_types)j;
466 if (nearestIndex >= 0 && (nearestIndex == m_currentPointIndex || selectedPoint == PTypeP || m_showAllHandles)) {
467 // a point was found and it is not a hidden handle
468 BPoint point = m_spline.points()[nearestIndex];
469 if (qAbs(p.x() - point[(int)selectedPoint].x()) * wWidth < 5 && qAbs(p.y() - point[(int)selectedPoint].y()) * wHeight < 5) {
470 *sel = selectedPoint;
478 #include "beziersplineeditor.moc"