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     int precision = m_spline.getPrecision();
  55     m_spline = spline;
  56     m_spline.setPrecision(precision);
  57     m_currentPointIndex = -1;
  58     m_mode = ModeNormal;
  59     emit modified();
  60     update();
  61 }
  62
  63 BPoint BezierSplineEditor::getCurrentPoint()
  64 {
  65     if (m_currentPointIndex >= 0)
  66         return m_spline.points()[m_currentPointIndex];
  67     else
  68         return BPoint();
  69 }
  70
  71 void BezierSplineEditor::updateCurrentPoint(const BPoint& p)
  72 {
  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]);
  77         update();
  78     }
  79 }
  80
  81 void BezierSplineEditor::setPixmap(const QPixmap& pixmap)
  82 {
  83     m_pixmap = pixmap;
  84     m_pixmapIsDirty = true;
  85     update();
  86 }
  87
  88 void BezierSplineEditor::slotZoomIn()
  89 {
  90     m_zoomLevel = qMax(m_zoomLevel-1, 0);
  91     m_pixmapIsDirty = true;
  92     update();
  93 }
  94
  95 void BezierSplineEditor::slotZoomOut()
  96 {
  97     m_zoomLevel = qMin(m_zoomLevel+1, 3);
  98     m_pixmapIsDirty = true;
  99     update();
 100 }
 101
 102 int BezierSplineEditor::gridLines()
 103 {
 104     return m_gridLines;
 105 }
 106
 107 void BezierSplineEditor::setGridLines(int lines)
 108 {
 109     m_gridLines = qBound(0, lines, 8);
 110     update();
 111 }
 112
 113 void BezierSplineEditor::paintEvent(QPaintEvent* event)
 114 {
 115     Q_UNUSED(event);
 116
 117     QPainter p(this);
 118
 119     int wWidth = width() - 1;
 120     int wHeight = height() - 1;
 121     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 122     wWidth -= 2 * offset;
 123     wHeight -= 2 * offset;
 124
 125     p.translate(offset, offset);
 126
 127     /*
 128      * Background
 129      */
 130     p.fillRect(rect().translated(-offset, -offset), palette().background());
 131     if (!m_pixmap.isNull()) {
 132         if (m_pixmapIsDirty || !m_pixmapCache) {
 133             if (m_pixmapCache)
 134                 delete m_pixmapCache;
 135             m_pixmapCache = new QPixmap(wWidth + 1, wHeight + 1);
 136             QPainter cachePainter(m_pixmapCache);
 137
 138             cachePainter.scale(1.0*(wWidth+1) / m_pixmap.width(), 1.0*(wHeight+1) / m_pixmap.height());
 139             cachePainter.drawPixmap(0, 0, m_pixmap);
 140             m_pixmapIsDirty = false;
 141         }
 142         p.drawPixmap(0, 0, *m_pixmapCache);
 143     }
 144
 145
 146     p.setPen(QPen(Qt::gray, 1, Qt::SolidLine));
 147
 148     /*
 149      * Borders
 150      */
 151     if (m_zoomLevel != 0) {
 152         p.drawRect(0, 0, wWidth, wHeight);
 153     }
 154
 155     /*
 156      * Grid
 157      */
 158     if (m_gridLines != 0) {
 159         double stepH = wWidth / (double)(m_gridLines + 1);
 160         double stepV = wHeight / (double)(m_gridLines + 1);
 161         for (int i = 1; i <= m_gridLines; ++i) {
 162             p.drawLine(QLineF(i * stepH, 0, i * stepH, wHeight));
 163             p.drawLine(QLineF(0, i * stepV, wWidth, i * stepV));
 164         }
 165     }
 166
 167     p.setRenderHint(QPainter::Antialiasing);
 168
 169     /*
 170      * Standard line
 171      */
 172     p.drawLine(QLineF(0, wHeight, wWidth, 0));
 173
 174     /*
 175      * Spline
 176      */
 177     double prevY = wHeight - m_spline.value(0.) * wHeight;
 178     double prevX = 0.;
 179     double curY;
 180     double normalizedX = -1;
 181     int x;
 182
 183     p.setPen(QPen(Qt::black, 1, Qt::SolidLine));
 184     for (x = 0 ; x < wWidth ; ++x) {
 185         normalizedX = x / (double)wWidth;
 186         curY = wHeight - m_spline.value(normalizedX, true) * wHeight;
 187
 188         /*
 189          * Keep in mind that QLineF rounds doubles
 190          * to ints mathematically, not just rounds down
 191          * like in C
 192          */
 193         p.drawLine(QLineF(prevX, prevY, x, curY));
 194         prevX = x;
 195         prevY = curY;
 196     }
 197     p.drawLine(QLineF(prevX, prevY ,
 198                       x, wHeight - m_spline.value(1.0, true) * wHeight));
 199
 200     /*
 201      * Points + Handles
 202      */
 203     int max = m_spline.points().count() - 1;
 204     p.setPen(QPen(Qt::red, 1, Qt::SolidLine));
 205     BPoint point;
 206     QPolygon handle(4);
 207     handle.setPoints(4,
 208                      1,  -2,
 209                      4,  1,
 210                      1,  4,
 211                      -2, 1);
 212     for (int i = 0; i <= max; ++i) {
 213         point = m_spline.points().at(i);
 214         if (i == m_currentPointIndex) {
 215             p.setBrush(QBrush(QColor(Qt::red), Qt::SolidPattern));
 216             if (i != 0)
 217                 p.drawLine(QLineF(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight, point.p.x() * wWidth, wHeight - point.p.y() * wHeight));
 218             if (i != max)
 219                 p.drawLine(QLineF(point.p.x() * wWidth, wHeight - point.p.y() * wHeight, point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight));
 220         }
 221
 222         p.drawEllipse(QRectF(point.p.x() * wWidth - 3,
 223                              wHeight - 3 - point.p.y() * wHeight, 6, 6));
 224         if (i != 0)
 225             p.drawConvexPolygon(handle.translated(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight));
 226         if (i != max)
 227             p.drawConvexPolygon(handle.translated(point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight));
 228
 229         if ( i == m_currentPointIndex)
 230             p.setBrush(QBrush(Qt::NoBrush));
 231     }
 232 }
 233
 234 void BezierSplineEditor::resizeEvent(QResizeEvent* event)
 235 {
 236     m_spline.setPrecision(width() > height() ? width() : height());
 237     m_pixmapIsDirty = true;
 238     QWidget::resizeEvent(event);
 239 }
 240
 241 void BezierSplineEditor::mousePressEvent(QMouseEvent* event)
 242 {
 243     int wWidth = width() - 1;
 244     int wHeight = height() - 1;
 245     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 246     wWidth -= 2 * offset;
 247     wHeight -= 2 * offset;
 248
 249     double x = (event->pos().x() - offset) / (double)(wWidth);
 250     double y = 1.0 - (event->pos().y() - offset) / (double)(wHeight);
 251
 252     point_types selectedPoint;
 253     int closestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &selectedPoint);
 254
 255     if (event->button() == Qt::RightButton && closestPointIndex > 0 && closestPointIndex < m_spline.points().count() - 1 && selectedPoint == PTypeP) {
 256         m_spline.removePoint(closestPointIndex);
 257         setCursor(Qt::ArrowCursor);
 258         m_mode = ModeNormal;
 259         if (closestPointIndex < m_currentPointIndex)
 260             --m_currentPointIndex;
 261         update();
 262         if (m_currentPointIndex >= 0)
 263             emit currentPoint(m_spline.points()[m_currentPointIndex]);
 264         else
 265             emit currentPoint(BPoint());
 266         emit modified();
 267         return;
 268     } else if (event->button() != Qt::LeftButton) {
 269         return;
 270     }
 271
 272     if (closestPointIndex < 0) {
 273         BPoint po;
 274         po.p = QPointF(x, y);
 275         po.h1 = QPointF(x-0.05, y-0.05);
 276         po.h2 = QPointF(x+0.05, y+0.05);
 277         m_currentPointIndex = m_spline.addPoint(po);
 278         m_currentPointType = PTypeP;
 279     } else {
 280         m_currentPointIndex = closestPointIndex;
 281         m_currentPointType = selectedPoint;
 282     }
 283
 284     BPoint point = m_spline.points()[m_currentPointIndex];
 285     QPointF p;
 286     switch (m_currentPointType) {
 287     case PTypeH1:
 288         p = point.h1;
 289         break;
 290     case PTypeP:
 291         p = point.p;
 292         break;
 293     case PTypeH2:
 294         p = point.h2;
 295     }
 296
 297     m_grabPOriginal = point;
 298     if (m_currentPointIndex > 0)
 299         m_grabPPrevious = m_spline.points()[m_currentPointIndex - 1];
 300     if (m_currentPointIndex < m_spline.points().count() - 1)
 301         m_grabPNext = m_spline.points()[m_currentPointIndex + 1];
 302     m_grabOffsetX = p.x() - x;
 303     m_grabOffsetY = p.y() - y;
 304
 305     switch (m_currentPointType) {
 306         case PTypeH1:
 307             point.h1 = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 308             break;
 309         case PTypeP:
 310             point.p = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 311             break;
 312         case PTypeH2:
 313             point.h2 = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 314     }
 315     m_spline.setPoint(m_currentPointIndex, point);
 316
 317     m_mode = ModeDrag;
 318
 319     emit currentPoint(point);
 320     update();
 321 }
 322
 323 void BezierSplineEditor::mouseReleaseEvent(QMouseEvent* event)
 324 {
 325     if (event->button() != Qt::LeftButton)
 326         return;
 327
 328     setCursor(Qt::ArrowCursor);
 329     m_mode = ModeNormal;
 330
 331     emit modified();
 332 }
 333
 334 void BezierSplineEditor::mouseMoveEvent(QMouseEvent* event)
 335 {
 336     int wWidth = width() - 1;
 337     int wHeight = height() - 1;
 338     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 339     wWidth -= 2 * offset;
 340     wHeight -= 2 * offset;
 341
 342     double x = (event->pos().x() - offset) / (double)(wWidth);
 343     double y = 1.0 - (event->pos().y() - offset) / (double)(wHeight);
 344
 345     if (m_mode == ModeNormal) {
 346         // If no point is selected set the the cursor shape if on top
 347         point_types type;
 348         int nearestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &type);
 349
 350         if (nearestPointIndex < 0)
 351             setCursor(Qt::ArrowCursor);
 352         else
 353             setCursor(Qt::CrossCursor);
 354     } else {
 355         // Else, drag the selected point
 356         setCursor(Qt::CrossCursor);
 357
 358         x += m_grabOffsetX;
 359         y += m_grabOffsetY;
 360
 361         double leftX = 0.;
 362         double rightX = 1.;
 363         BPoint point = m_spline.points()[m_currentPointIndex];
 364         switch (m_currentPointType) {
 365         case PTypeH1:
 366             rightX = point.p.x();
 367             if (m_currentPointIndex == 0)
 368                 leftX = -1000;
 369             else
 370                 leftX = m_spline.points()[m_currentPointIndex - 1].p.x();
 371
 372             x = qBound(leftX, x, rightX);
 373             point.h1 = QPointF(x, y);
 374             break;
 375
 376         case PTypeP:
 377             if (m_currentPointIndex == 0)
 378                 rightX = 0.0;
 379             else if (m_currentPointIndex == m_spline.points().count() - 1)
 380                 leftX = 1.0;
 381
 382             x = qBound(leftX, x, rightX);
 383             y = qBound(0., y, 1.);
 384
 385             // handles might have changed because we neared another point
 386             // try to restore
 387             point.h1 = m_grabPOriginal.h1;
 388             point.h2 = m_grabPOriginal.h2;
 389             // and then move them by same offset
 390             point.h1 += QPointF(x, y) - m_grabPOriginal.p;
 391             point.h2 += QPointF(x, y) - m_grabPOriginal.p;
 392
 393             point.p = QPointF(x, y);
 394             break;
 395
 396         case PTypeH2:
 397             leftX = point.p.x();
 398             if (m_currentPointIndex == m_spline.points().count() - 1)
 399                 rightX = 1001;
 400             else
 401                 rightX = m_spline.points()[m_currentPointIndex + 1].p.x();
 402
 403             x = qBound(leftX, x, rightX);
 404             point.h2 = QPointF(x, y);
 405         };
 406
 407         int index = m_currentPointIndex;
 408         m_currentPointIndex = m_spline.setPoint(m_currentPointIndex, point);
 409
 410         if (m_currentPointType == PTypeP) {
 411             // we might have changed the handles of other points
 412             // try to restore
 413             if (index == m_currentPointIndex) {
 414                 if (m_currentPointIndex > 0)
 415                     m_spline.setPoint(m_currentPointIndex - 1, m_grabPPrevious);
 416                 if (m_currentPointIndex < m_spline.points().count() -1)
 417                     m_spline.setPoint(m_currentPointIndex + 1, m_grabPNext);
 418             } else {
 419                 if (m_currentPointIndex < index) {
 420                     m_spline.setPoint(index, m_grabPPrevious);
 421                     m_grabPNext = m_grabPPrevious;
 422                     if (m_currentPointIndex > 0)
 423                         m_grabPPrevious = m_spline.points()[m_currentPointIndex - 1];
 424                 } else {
 425                     m_spline.setPoint(index, m_grabPNext);
 426                     m_grabPPrevious = m_grabPNext;
 427                     if (m_currentPointIndex < m_spline.points().count() - 1)
 428                         m_grabPNext = m_spline.points()[m_currentPointIndex + 1];
 429                 }
 430             }
 431         }
 432
 433         emit currentPoint(point);
 434         update();
 435     }
 436 }
 437
 438 void BezierSplineEditor::leaveEvent(QEvent* event)
 439 {
 440     QWidget::leaveEvent(event);
 441 }
 442
 443 int BezierSplineEditor::nearestPointInRange(QPointF p, int wWidth, int wHeight, BezierSplineEditor::point_types* sel)
 444 {
 445     double nearestDistanceSquared = 1000;
 446     point_types selectedPoint;
 447     int nearestIndex = -1;
 448     int i = 0;
 449
 450     double distanceSquared;
 451     // find out distance using the Pythagorean theorem
 452     foreach(const BPoint & point, m_spline.points()) {
 453         distanceSquared = pow(point.h1.x() - p.x(), 2) + pow(point.h1.y() - p.y(), 2);
 454         if (distanceSquared < nearestDistanceSquared) {
 455             nearestIndex = i;
 456             nearestDistanceSquared = distanceSquared;
 457             selectedPoint = PTypeH1;
 458         }
 459         distanceSquared = pow(point.p.x() - p.x(), 2) + pow(point.p.y() - p.y(), 2);
 460         if (distanceSquared < nearestDistanceSquared) {
 461             nearestIndex = i;
 462             nearestDistanceSquared = distanceSquared;
 463             selectedPoint = PTypeP;
 464         }
 465         distanceSquared = pow(point.h2.x() - p.x(), 2) + pow(point.h2.y() - p.y(), 2);
 466         if (distanceSquared < nearestDistanceSquared) {
 467             nearestIndex = i;
 468             nearestDistanceSquared = distanceSquared;
 469             selectedPoint = PTypeH2;
 470         }
 471         ++i;
 472     }
 473
 474     if (nearestIndex >= 0) {
 475         BPoint point = m_spline.points()[nearestIndex];
 476         QPointF p2;
 477         switch (selectedPoint) {
 478         case PTypeH1:
 479             p2 = point.h1;
 480             break;
 481         case PTypeP:
 482             p2 = point.p;
 483             break;
 484         case PTypeH2:
 485             p2 = point.h2;
 486         }
 487         if (qAbs(p.x() - p2.x()) * wWidth < 5 && qAbs(p.y() - p2.y()) * wHeight < 5) {
 488             *sel = selectedPoint;
 489             return nearestIndex;
 490         }
 491     }
 492
 493     return -1;
 494 }
 495
 496 #include "beziersplineeditor.moc"