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