git.sesse.net Git - kdenlive/blob - src/beziercurve/beziersplineeditor.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2010 by Till Theato (root@ttill.de)                     *
   3  *   This file is part of Kdenlive (www.kdenlive.org).                     *
   4  *                                                                         *
   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.                                   *
   9  *                                                                         *
  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.                          *
  14  *                                                                         *
  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  ***************************************************************************/
  18
  19 #include "beziersplineeditor.h"
  20
  21 #include <QPainter>
  22 #include <QMouseEvent>
  23
  24
  25 BezierSplineEditor::BezierSplineEditor(QWidget* parent) :
  26         QWidget(parent),
  27         m_mode(ModeNormal),
  28         m_zoomLevel(0),
  29         m_gridLines(3),
  30         m_pixmapCache(NULL),
  31         m_pixmapIsDirty(true),
  32         m_currentPointIndex(-1)
  33 {
  34     setMouseTracking(true);
  35     setAutoFillBackground(false);
  36     setAttribute(Qt::WA_OpaquePaintEvent);
  37     setMinimumSize(150, 150);
  38     setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  39 }
  40
  41 BezierSplineEditor::~BezierSplineEditor()
  42 {
  43     if (m_pixmapCache)
  44         delete m_pixmapCache;
  45 }
  46
  47 CubicBezierSpline BezierSplineEditor::spline()
  48 {
  49     return m_spline;
  50 }
  51
  52 void BezierSplineEditor::setSpline(const CubicBezierSpline& spline)
  53 {
  54     // TODO: cleanup
  55     m_spline.fromString(spline.toString());
  56 }
  57
  58 BPoint BezierSplineEditor::getCurrentPoint()
  59 {
  60     if (m_currentPointIndex >= 0)
  61         return m_spline.points()[m_currentPointIndex];
  62     else
  63         return BPoint();
  64 }
  65
  66 void BezierSplineEditor::updateCurrentPoint(const BPoint& p)
  67 {
  68     if (m_currentPointIndex >= 0) {
  69         m_spline.setPoint(m_currentPointIndex, p);
  70         // during validation the point might have changed
  71         emit currentPoint(m_spline.points()[m_currentPointIndex]);
  72         update();
  73     }
  74 }
  75
  76 void BezierSplineEditor::setPixmap(const QPixmap& pixmap)
  77 {
  78     m_pixmap = pixmap;
  79     m_pixmapIsDirty = true;
  80     update();
  81 }
  82
  83 void BezierSplineEditor::slotZoomIn()
  84 {
  85     m_zoomLevel = qMax(m_zoomLevel-1, 0);
  86     m_pixmapIsDirty = true;
  87     update();
  88 }
  89
  90 void BezierSplineEditor::slotZoomOut()
  91 {
  92     m_zoomLevel = qMin(m_zoomLevel+1, 3);
  93     m_pixmapIsDirty = true;
  94     update();
  95 }
  96
  97 int BezierSplineEditor::gridLines()
  98 {
  99     return m_gridLines;
 100 }
 101
 102 void BezierSplineEditor::setGridLines(int lines)
 103 {
 104     m_gridLines = qBound(0, lines, 8);
 105     update();
 106 }
 107
 108 void BezierSplineEditor::paintEvent(QPaintEvent* event)
 109 {
 110     Q_UNUSED(event);
 111
 112     QPainter p(this);
 113
 114     int wWidth = width() - 1;
 115     int wHeight = height() - 1;
 116     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 117     wWidth -= 2 * offset;
 118     wHeight -= 2 * offset;
 119
 120     /*
 121      * Background
 122      */
 123     p.fillRect(rect(), palette().background());
 124     if (!m_pixmap.isNull()) {
 125         if (m_pixmapIsDirty || !m_pixmapCache) {
 126             if (m_pixmapCache)
 127                 delete m_pixmapCache;
 128             m_pixmapCache = new QPixmap(wWidth + 1, wHeight + 1);
 129             QPainter cachePainter(m_pixmapCache);
 130
 131             cachePainter.scale(1.0*(wWidth+1) / m_pixmap.width(), 1.0*(wHeight+1) / m_pixmap.height());
 132             cachePainter.drawPixmap(0, 0, m_pixmap);
 133             m_pixmapIsDirty = false;
 134         }
 135         p.drawPixmap(offset, offset, *m_pixmapCache);
 136     }
 137
 138     /*
 139      * Standard line
 140      */
 141     /*p.setPen(QPen(Qt::gray, 1, Qt::SolidLine));
 142     p.drawLine(QLineF(0, wHeight, wWidth, 0));*/
 143
 144     p.setPen(QPen(Qt::gray, 1, Qt::SolidLine));
 145
 146     /*
 147      * Borders
 148      */
 149     if (m_zoomLevel != 0) {
 150         p.drawRect(offset, offset, wWidth, wHeight);
 151     }
 152
 153     /*
 154      * Grid
 155      */
 156     if (m_gridLines != 0) {
 157         double stepH = wWidth / (double)(m_gridLines + 1);
 158         double stepV = wHeight / (double)(m_gridLines + 1);
 159         for (int i = 1; i <= m_gridLines; ++i) {
 160             p.drawLine(QLineF(i * stepH, 0, i * stepH, wHeight).translated(offset, offset));
 161             p.drawLine(QLineF(0, i * stepV, wWidth, i * stepV).translated(offset, offset));
 162         }
 163     }
 164
 165     /*
 166      * Spline
 167      */
 168     double prevY = wHeight - m_spline.value(0.) * wHeight;
 169     double prevX = 0.;
 170     double curY;
 171     double normalizedX = -1;
 172     int x;
 173
 174     p.setPen(QPen(Qt::black, 1, Qt::SolidLine));
 175     for (x = 0 ; x < wWidth ; ++x) {
 176         normalizedX = x / (double)wWidth;
 177         curY = wHeight - m_spline.value(normalizedX, true) * wHeight;
 178
 179         /*
 180          * Keep in mind that QLineF rounds doubles
 181          * to ints mathematically, not just rounds down
 182          * like in C
 183          */
 184         p.drawLine(QLineF(prevX, prevY,
 185                           x, curY).translated(offset, offset));
 186         prevX = x;
 187         prevY = curY;
 188     }
 189     p.drawLine(QLineF(prevX, prevY ,
 190                       x, wHeight - m_spline.value(1.0, true) * wHeight).translated(offset, offset));
 191
 192     /*
 193      * Points + Handles
 194      */
 195     int max = m_spline.points().count() - 1;
 196     p.setPen(QPen(Qt::red, 1, Qt::SolidLine));
 197     BPoint point;
 198     QPolygon handle(4);
 199     handle.setPoints(4,
 200                      1,  -2,
 201                      4,  1,
 202                      1,  4,
 203                      -2, 1);
 204     for (int i = 0; i <= max; ++i) {
 205         point = m_spline.points().at(i);
 206         if (i == m_currentPointIndex) {
 207             p.setBrush(QBrush(QColor(Qt::red), Qt::SolidPattern));
 208             if (i != 0)
 209                 p.drawLine(QLineF(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight, point.p.x() * wWidth, wHeight - point.p.y() * wHeight).translated(offset, offset));
 210             if (i != max)
 211                 p.drawLine(QLineF(point.p.x() * wWidth, wHeight - point.p.y() * wHeight, point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight).translated(offset, offset));
 212         }
 213
 214         p.drawEllipse(QRectF(point.p.x() * wWidth - 3,
 215                              wHeight - 3 - point.p.y() * wHeight, 6, 6).translated(offset, offset));
 216         if (i != 0)
 217             p.drawConvexPolygon(handle.translated(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight).translated(offset, offset));
 218         if (i != max)
 219             p.drawConvexPolygon(handle.translated(point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight).translated(offset, offset));
 220
 221         if ( i == m_currentPointIndex)
 222             p.setBrush(QBrush(Qt::NoBrush));
 223     }
 224 }
 225
 226 void BezierSplineEditor::resizeEvent(QResizeEvent* event)
 227 {
 228     m_spline.setPrecision(width());
 229     m_pixmapIsDirty = true;
 230     QWidget::resizeEvent(event);
 231 }
 232
 233 void BezierSplineEditor::mousePressEvent(QMouseEvent* event)
 234 {
 235     int wWidth = width() - 1;
 236     int wHeight = height() - 1;
 237     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 238     wWidth -= 2 * offset;
 239     wHeight -= 2 * offset;
 240
 241     double x = (event->pos().x() - offset) / (double)(wWidth);
 242     double y = 1.0 - (event->pos().y() - offset) / (double)(wHeight);
 243
 244     point_types selectedPoint;
 245     int closestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &selectedPoint);
 246
 247     if (event->button() == Qt::RightButton && closestPointIndex > 0 && closestPointIndex < m_spline.points().count() - 1 && selectedPoint == PTypeP) {
 248         m_spline.removePoint(closestPointIndex);
 249         setCursor(Qt::ArrowCursor);
 250         m_mode = ModeNormal;
 251         if (closestPointIndex < m_currentPointIndex)
 252             --m_currentPointIndex;
 253         update();
 254         if (m_currentPointIndex >= 0)
 255             emit currentPoint(m_spline.points()[m_currentPointIndex]);
 256         else
 257             emit currentPoint(BPoint());
 258         emit modified();
 259         return;
 260     } else if (event->button() != Qt::LeftButton) {
 261         return;
 262     }
 263
 264     if (closestPointIndex < 0) {
 265         BPoint po;
 266         po.p = QPointF(x, y);
 267         po.h1 = QPointF(x-0.05, y-0.05);
 268         po.h2 = QPointF(x+0.05, y+0.05);
 269         m_currentPointIndex = m_spline.addPoint(po);
 270         m_currentPointType = PTypeP;
 271         /*if (!d->jumpOverExistingPoints(newPoint, -1)) return;*/
 272     } else {
 273         m_currentPointIndex = closestPointIndex;
 274         m_currentPointType = selectedPoint;
 275     }
 276
 277     BPoint point = m_spline.points()[m_currentPointIndex];
 278     QPointF p;
 279     switch (m_currentPointType) {
 280     case PTypeH1:
 281         p = point.h1;
 282         break;
 283     case PTypeP:
 284         p = point.p;
 285         break;
 286     case PTypeH2:
 287         p = point.h2;
 288     }
 289
 290     m_grabOriginalX = p.x();
 291     m_grabOriginalY = p.y();
 292     m_grabOffsetX = p.x() - x;
 293     m_grabOffsetY = p.y() - y;
 294
 295     switch (m_currentPointType) {
 296         case PTypeH1:
 297             point.h1 = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 298             break;
 299         case PTypeP:
 300             point.p = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 301             break;
 302         case PTypeH2:
 303             point.h2 = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 304     }
 305     m_spline.setPoint(m_currentPointIndex, point);
 306
 307     //d->m_draggedAwayPointIndex = -1;
 308
 309     m_mode = ModeDrag;
 310
 311     emit currentPoint(point);
 312     update();
 313 }
 314
 315 void BezierSplineEditor::mouseReleaseEvent(QMouseEvent* event)
 316 {
 317     if (event->button() != Qt::LeftButton)
 318         return;
 319
 320     setCursor(Qt::ArrowCursor);
 321     m_mode = ModeNormal;
 322
 323     emit modified();
 324 }
 325
 326 void BezierSplineEditor::mouseMoveEvent(QMouseEvent* event)
 327 {
 328     int wWidth = width() - 1;
 329     int wHeight = height() - 1;
 330     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 331     wWidth -= 2 * offset;
 332     wHeight -= 2 * offset;
 333
 334     double x = (event->pos().x() - offset) / (double)(wWidth);
 335     double y = 1.0 - (event->pos().y() - offset) / (double)(wHeight);
 336
 337     if (m_mode == ModeNormal) { // If no point is selected set the the cursor shape if on top
 338         point_types type;
 339         int nearestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &type);
 340
 341         if (nearestPointIndex < 0)
 342             setCursor(Qt::ArrowCursor);
 343         else
 344             setCursor(Qt::CrossCursor);
 345     } else { // Else, drag the selected point
 346         /*bool crossedHoriz = event->pos().x() - width() > MOUSE_AWAY_THRES ||
 347         event->pos().x() < -MOUSE_AWAY_THRES;
 348         bool crossedVert =  event->pos().y() - height() > MOUSE_AWAY_THRES ||
 349         event->pos().y() < -MOUSE_AWAY_THRES;
 350
 351         bool removePoint = (crossedHoriz || crossedVert);
 352
 353         if (!removePoint && d->m_draggedAwayPointIndex >= 0) {
 354             // point is no longer dragged away so reinsert it
 355             QPointF newPoint(d->m_draggedAwayPoint);
 356             d->m_grab_point_index = d->m_curve.addPoint(newPoint);
 357             d->m_draggedAwayPointIndex = -1;
 358         }
 359
 360         if (removePoint &&
 361             (d->m_draggedAwayPointIndex >= 0))
 362             return;
 363         */
 364
 365         setCursor(Qt::CrossCursor);
 366
 367         x += m_grabOffsetX;
 368         y += m_grabOffsetY;
 369
 370         double leftX, rightX;
 371         BPoint point = m_spline.points()[m_currentPointIndex];
 372         switch (m_currentPointType) {
 373         case PTypeH1:
 374             rightX = point.p.x();
 375             if (m_currentPointIndex == 0)
 376                 leftX = -1000;
 377             else
 378                 leftX = m_spline.points()[m_currentPointIndex - 1].p.x();
 379             x = qBound(leftX, x, rightX);
 380             point.h1 = QPointF(x, y);
 381             break;
 382         case PTypeP:
 383             if (m_currentPointIndex == 0) {
 384                 leftX = 0.0;
 385                 rightX = 0.0;
 386                 /*if (d->m_curve.points().count() > 1)
 387                  *           rightX = d->m_curve.points()[d->m_grab_point_index + 1].x() - POINT_AREA;
 388                  *       else
 389                  *           rightX = 1.0;*/
 390             } else if (m_currentPointIndex == m_spline.points().count() - 1) {
 391                 leftX = 1.0;//m_spline.points()[m_currentPointIndex - 1].p.x();
 392                 rightX = 1.0;
 393             } else {
 394                 //// the 1E-4 addition so we can grab the dot later.
 395                 leftX = m_spline.points()[m_currentPointIndex - 1].p.x();// + POINT_AREA;
 396                 rightX = m_spline.points()[m_currentPointIndex + 1].p.x();// - POINT_AREA;
 397             }
 398             x = qBound(leftX, x, rightX);
 399             y = qBound(0., y, 1.);
 400
 401             // move handles by same offset
 402             point.h1 += QPointF(x, y) - point.p;
 403             point.h2 += QPointF(x, y) - point.p;
 404
 405             point.p = QPointF(x, y);
 406             break;
 407         case PTypeH2:
 408             leftX = point.p.x();
 409             if (m_currentPointIndex == m_spline.points().count() - 1)
 410                 rightX = 1001;
 411             else
 412                 rightX = m_spline.points()[m_currentPointIndex + 1].p.x();
 413             x = qBound(leftX, x, rightX);
 414             point.h2 = QPointF(x, y);
 415         };
 416
 417         m_spline.setPoint(m_currentPointIndex, point);
 418
 419         /*if (removePoint && d->m_curve.points().count() > 2) {
 420             d->m_draggedAwayPoint = d->m_curve.points()[d->m_grab_point_index];
 421             d->m_draggedAwayPointIndex = d->m_grab_point_index;
 422             d->m_curve.removePoint(d->m_grab_point_index);
 423             d->m_grab_point_index = bounds(d->m_grab_point_index, 0, d->m_curve.points().count() - 1);
 424         }
 425
 426         d->setCurveModified();*/
 427         emit currentPoint(point);
 428         update();
 429     }
 430 }
 431
 432 void BezierSplineEditor::leaveEvent(QEvent* event)
 433 {
 434     QWidget::leaveEvent(event);
 435 }
 436
 437 int BezierSplineEditor::nearestPointInRange(QPointF p, int wWidth, int wHeight, BezierSplineEditor::point_types* sel)
 438 {
 439     double nearestDistanceSquared = 1000;
 440     point_types selectedPoint;
 441     int nearestIndex = -1;
 442     int i = 0;
 443
 444     double distanceSquared;
 445     foreach(const BPoint & point, m_spline.points()) {
 446         distanceSquared = pow(point.h1.x() - p.x(), 2) + pow(point.h1.y() - p.y(), 2);
 447         if (distanceSquared < nearestDistanceSquared) {
 448             nearestIndex = i;
 449             nearestDistanceSquared = distanceSquared;
 450             selectedPoint = PTypeH1;
 451         }
 452         distanceSquared = pow(point.p.x() - p.x(), 2) + pow(point.p.y() - p.y(), 2);
 453         if (distanceSquared < nearestDistanceSquared) {
 454             nearestIndex = i;
 455             nearestDistanceSquared = distanceSquared;
 456             selectedPoint = PTypeP;
 457         }
 458         distanceSquared = pow(point.h2.x() - p.x(), 2) + pow(point.h2.y() - p.y(), 2);
 459         if (distanceSquared < nearestDistanceSquared) {
 460             nearestIndex = i;
 461             nearestDistanceSquared = distanceSquared;
 462             selectedPoint = PTypeH2;
 463         }
 464         ++i;
 465     }
 466
 467     if (nearestIndex >= 0) {
 468         BPoint point = m_spline.points()[nearestIndex];
 469         QPointF p2;
 470         switch (selectedPoint) {
 471         case PTypeH1:
 472             p2 = point.h1;
 473             break;
 474         case PTypeP:
 475             p2 = point.p;
 476             break;
 477         case PTypeH2:
 478             p2 = point.h2;
 479         }
 480         if (qAbs(p.x() - p2.x()) * wWidth < 5 && qAbs(p.y() - p2.y()) * wHeight < 5) {
 481             *sel = selectedPoint;
 482             return nearestIndex;
 483         }
 484     }
 485
 486     return -1;
 487 }
 488
 489 #include "beziersplineeditor.moc"