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