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_showAllHandles(true),
  31         m_pixmapCache(NULL),
  32         m_pixmapIsDirty(true),
  33         m_currentPointIndex(-1)
  34 {
  35     setMouseTracking(true);
  36     setAutoFillBackground(false);
  37     setAttribute(Qt::WA_OpaquePaintEvent);
  38     setMinimumSize(150, 150);
  39     setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  40 }
  41
  42 BezierSplineEditor::~BezierSplineEditor()
  43 {
  44     if (m_pixmapCache)
  45         delete m_pixmapCache;
  46 }
  47
  48 CubicBezierSpline BezierSplineEditor::spline()
  49 {
  50     return m_spline;
  51 }
  52
  53 void BezierSplineEditor::setSpline(const CubicBezierSpline& spline)
  54 {
  55     int precision = m_spline.getPrecision();
  56     m_spline = spline;
  57     m_spline.setPrecision(precision);
  58     m_currentPointIndex = -1;
  59     m_mode = ModeNormal;
  60     emit currentPoint(BPoint());
  61     emit modified();
  62     update();
  63 }
  64
  65 BPoint BezierSplineEditor::getCurrentPoint()
  66 {
  67     if (m_currentPointIndex >= 0)
  68         return m_spline.points()[m_currentPointIndex];
  69     else
  70         return BPoint();
  71 }
  72
  73 void BezierSplineEditor::updateCurrentPoint(const BPoint& p)
  74 {
  75     if (m_currentPointIndex >= 0) {
  76         m_spline.setPoint(m_currentPointIndex, p);
  77         // during validation the point might have changed
  78         emit currentPoint(m_spline.points()[m_currentPointIndex]);
  79         emit modified();
  80         update();
  81     }
  82 }
  83
  84 void BezierSplineEditor::setPixmap(const QPixmap& pixmap)
  85 {
  86     m_pixmap = pixmap;
  87     m_pixmapIsDirty = true;
  88     update();
  89 }
  90
  91 void BezierSplineEditor::slotZoomIn()
  92 {
  93     m_zoomLevel = qMax(m_zoomLevel-1, 0);
  94     m_pixmapIsDirty = true;
  95     update();
  96 }
  97
  98 void BezierSplineEditor::slotZoomOut()
  99 {
 100     m_zoomLevel = qMin(m_zoomLevel+1, 3);
 101     m_pixmapIsDirty = true;
 102     update();
 103 }
 104
 105 void BezierSplineEditor::setShowAllHandles(bool show)
 106 {
 107     m_showAllHandles = show;
 108     update();
 109 }
 110
 111 int BezierSplineEditor::gridLines()
 112 {
 113     return m_gridLines;
 114 }
 115
 116 void BezierSplineEditor::setGridLines(int lines)
 117 {
 118     m_gridLines = qBound(0, lines, 8);
 119     update();
 120 }
 121
 122 void BezierSplineEditor::paintEvent(QPaintEvent* event)
 123 {
 124     Q_UNUSED(event);
 125
 126     QPainter p(this);
 127
 128     int wWidth = width() - 1;
 129     int wHeight = height() - 1;
 130     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 131     wWidth -= 2 * offset;
 132     wHeight -= 2 * offset;
 133
 134     p.translate(offset, offset);
 135
 136     /*
 137      * Background
 138      */
 139     p.fillRect(rect().translated(-offset, -offset), palette().background());
 140     if (!m_pixmap.isNull()) {
 141         if (m_pixmapIsDirty || !m_pixmapCache) {
 142             if (m_pixmapCache)
 143                 delete m_pixmapCache;
 144             m_pixmapCache = new QPixmap(wWidth + 1, wHeight + 1);
 145             QPainter cachePainter(m_pixmapCache);
 146
 147             cachePainter.scale(1.0*(wWidth+1) / m_pixmap.width(), 1.0*(wHeight+1) / m_pixmap.height());
 148             cachePainter.drawPixmap(0, 0, m_pixmap);
 149             m_pixmapIsDirty = false;
 150         }
 151         p.drawPixmap(0, 0, *m_pixmapCache);
 152     }
 153
 154
 155     p.setPen(QPen(Qt::gray, 1, Qt::SolidLine));
 156
 157     /*
 158      * Borders
 159      */
 160     if (m_zoomLevel != 0) {
 161         p.drawRect(0, 0, wWidth, wHeight);
 162     }
 163
 164     /*
 165      * Grid
 166      */
 167     if (m_gridLines != 0) {
 168         double stepH = wWidth / (double)(m_gridLines + 1);
 169         double stepV = wHeight / (double)(m_gridLines + 1);
 170         for (int i = 1; i <= m_gridLines; ++i) {
 171             p.drawLine(QLineF(i * stepH, 0, i * stepH, wHeight));
 172             p.drawLine(QLineF(0, i * stepV, wWidth, i * stepV));
 173         }
 174     }
 175
 176     p.setRenderHint(QPainter::Antialiasing);
 177
 178     /*
 179      * Standard line
 180      */
 181     p.drawLine(QLineF(0, wHeight, wWidth, 0));
 182
 183     /*
 184      * Spline
 185      */
 186     double prevY = wHeight - m_spline.value(0.) * wHeight;
 187     double prevX = 0.;
 188     double curY;
 189     double normalizedX = -1;
 190     int x;
 191
 192     p.setPen(QPen(Qt::black, 1, Qt::SolidLine));
 193     for (x = 0 ; x < wWidth ; ++x) {
 194         normalizedX = x / (double)wWidth;
 195         curY = wHeight - m_spline.value(normalizedX, true) * wHeight;
 196
 197         /*
 198          * Keep in mind that QLineF rounds doubles
 199          * to ints mathematically, not just rounds down
 200          * like in C
 201          */
 202         p.drawLine(QLineF(prevX, prevY, x, curY));
 203         prevX = x;
 204         prevY = curY;
 205     }
 206     p.drawLine(QLineF(prevX, prevY ,
 207                       x, wHeight - m_spline.value(1.0, true) * wHeight));
 208
 209     /*
 210      * Points + Handles
 211      */
 212     int max = m_spline.points().count() - 1;
 213     p.setPen(QPen(Qt::red, 1, Qt::SolidLine));
 214     BPoint point;
 215
 216     QPolygonF handle = QPolygonF() << QPointF(0, -3) << QPointF(3, 0) << QPointF(0, 3) << QPointF(-3, 0);
 217 #if QT_VERSION < 0x040600
 218     QPolygonF tmp;
 219 #endif
 220
 221     for (int i = 0; i <= max; ++i) {
 222         point = m_spline.points().at(i);
 223         if (i == m_currentPointIndex) {
 224             // selected point: fill p and handles
 225             p.setBrush(QBrush(QColor(Qt::red), Qt::SolidPattern));
 226             // connect p and handles with lines
 227             if (i != 0)
 228                 p.drawLine(QLineF(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight, point.p.x() * wWidth, wHeight - point.p.y() * wHeight));
 229             if (i != max)
 230                 p.drawLine(QLineF(point.p.x() * wWidth, wHeight - point.p.y() * wHeight, point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight));
 231         }
 232
 233         p.drawEllipse(QRectF(point.p.x() * wWidth - 3,
 234                              wHeight - 3 - point.p.y() * wHeight, 6, 6));
 235         if (i != 0 && (i == m_currentPointIndex || m_showAllHandles)) {
 236 #if QT_VERSION >= 0x040600
 237             p.drawConvexPolygon(handle.translated(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight));
 238 #else
 239             tmp = handle;
 240             tmp.translate(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight);
 241             p.drawConvexPolygon(tmp);
 242 #endif
 243         }
 244         if (i != max && (i == m_currentPointIndex || m_showAllHandles)) {
 245 #if QT_VERSION >= 0x040600
 246             p.drawConvexPolygon(handle.translated(point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight));
 247 #else
 248             tmp = handle;
 249             tmp.translate(point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight);
 250             p.drawConvexPolygon(tmp);
 251 #endif
 252         }
 253
 254         if ( i == m_currentPointIndex)
 255             p.setBrush(QBrush(Qt::NoBrush));
 256     }
 257 }
 258
 259 void BezierSplineEditor::resizeEvent(QResizeEvent* event)
 260 {
 261     m_spline.setPrecision(width() > height() ? width() : height());
 262     m_pixmapIsDirty = true;
 263     QWidget::resizeEvent(event);
 264 }
 265
 266 void BezierSplineEditor::mousePressEvent(QMouseEvent* event)
 267 {
 268     int wWidth = width() - 1;
 269     int wHeight = height() - 1;
 270     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 271     wWidth -= 2 * offset;
 272     wHeight -= 2 * offset;
 273
 274     double x = (event->pos().x() - offset) / (double)(wWidth);
 275     double y = 1.0 - (event->pos().y() - offset) / (double)(wHeight);
 276
 277     point_types selectedPoint;
 278     int closestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &selectedPoint);
 279
 280     if (event->button() == Qt::RightButton && closestPointIndex > 0 && closestPointIndex < m_spline.points().count() - 1 && selectedPoint == PTypeP) {
 281         m_spline.removePoint(closestPointIndex);
 282         setCursor(Qt::ArrowCursor);
 283         m_mode = ModeNormal;
 284         if (closestPointIndex < m_currentPointIndex)
 285             --m_currentPointIndex;
 286         update();
 287         if (m_currentPointIndex >= 0)
 288             emit currentPoint(m_spline.points()[m_currentPointIndex]);
 289         else
 290             emit currentPoint(BPoint());
 291         emit modified();
 292         return;
 293     } else if (event->button() != Qt::LeftButton) {
 294         return;
 295     }
 296
 297     if (closestPointIndex < 0) {
 298         m_currentPointIndex = m_spline.addPoint(BPoint(QPointF(x-0.05, y-0.05),
 299                                                        QPointF(x, y),
 300                                                        QPointF(x+0.05, y+0.05)));
 301         m_currentPointType = PTypeP;
 302     } else {
 303         m_currentPointIndex = closestPointIndex;
 304         m_currentPointType = selectedPoint;
 305     }
 306
 307     BPoint point = m_spline.points()[m_currentPointIndex];
 308
 309     m_grabPOriginal = point;
 310     if (m_currentPointIndex > 0)
 311         m_grabPPrevious = m_spline.points()[m_currentPointIndex - 1];
 312     if (m_currentPointIndex < m_spline.points().count() - 1)
 313         m_grabPNext = m_spline.points()[m_currentPointIndex + 1];
 314     m_grabOffsetX = point[(int)m_currentPointType].x() - x;
 315     m_grabOffsetY = point[(int)m_currentPointType].y() - y;
 316
 317     point[(int)m_currentPointType] = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 318
 319     m_spline.setPoint(m_currentPointIndex, point);
 320
 321     m_mode = ModeDrag;
 322
 323     emit currentPoint(point);
 324     update();
 325 }
 326
 327 void BezierSplineEditor::mouseReleaseEvent(QMouseEvent* event)
 328 {
 329     if (event->button() != Qt::LeftButton)
 330         return;
 331
 332     setCursor(Qt::ArrowCursor);
 333     m_mode = ModeNormal;
 334
 335     emit modified();
 336 }
 337
 338 void BezierSplineEditor::mouseMoveEvent(QMouseEvent* event)
 339 {
 340     int wWidth = width() - 1;
 341     int wHeight = height() - 1;
 342     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 343     wWidth -= 2 * offset;
 344     wHeight -= 2 * offset;
 345
 346     double x = (event->pos().x() - offset) / (double)(wWidth);
 347     double y = 1.0 - (event->pos().y() - offset) / (double)(wHeight);
 348
 349     if (m_mode == ModeNormal) {
 350         // If no point is selected set the the cursor shape if on top
 351         point_types type;
 352         int nearestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &type);
 353
 354         if (nearestPointIndex < 0)
 355             setCursor(Qt::ArrowCursor);
 356         else
 357             setCursor(Qt::CrossCursor);
 358     } else {
 359         // Else, drag the selected point
 360         setCursor(Qt::CrossCursor);
 361
 362         x += m_grabOffsetX;
 363         y += m_grabOffsetY;
 364
 365         double leftX = 0.;
 366         double rightX = 1.;
 367         BPoint point = m_spline.points()[m_currentPointIndex];
 368         switch (m_currentPointType) {
 369         case PTypeH1:
 370             rightX = point.p.x();
 371             if (m_currentPointIndex == 0)
 372                 leftX = -4;
 373             else
 374                 leftX = m_spline.points()[m_currentPointIndex - 1].p.x();
 375
 376             x = qBound(leftX, x, rightX);
 377             point.setH1(QPointF(x, y));
 378             break;
 379
 380         case PTypeP:
 381             if (m_currentPointIndex == 0)
 382                 rightX = 0.0;
 383             else if (m_currentPointIndex == m_spline.points().count() - 1)
 384                 leftX = 1.0;
 385
 386             x = qBound(leftX, x, rightX);
 387             y = qBound(0., y, 1.);
 388
 389             // handles might have changed because we neared another point
 390             // try to restore
 391             point.h1 = m_grabPOriginal.h1;
 392             point.h2 = m_grabPOriginal.h2;
 393             // and move by same offset
 394             // (using update handle in point.setP won't work because the offset between new and old point is very small)
 395             point.h1 += QPointF(x, y) - m_grabPOriginal.p;
 396             point.h2 += QPointF(x, y) - m_grabPOriginal.p;
 397
 398             point.setP(QPointF(x, y), false);
 399             break;
 400
 401         case PTypeH2:
 402             leftX = point.p.x();
 403             if (m_currentPointIndex == m_spline.points().count() - 1)
 404                 rightX = 5;
 405             else
 406                 rightX = m_spline.points()[m_currentPointIndex + 1].p.x();
 407
 408             x = qBound(leftX, x, rightX);
 409             point.setH2(QPointF(x, y));
 410         };
 411
 412         int index = m_currentPointIndex;
 413         m_currentPointIndex = m_spline.setPoint(m_currentPointIndex, point);
 414
 415         if (m_currentPointType == PTypeP) {
 416             // we might have changed the handles of other points
 417             // try to restore
 418             if (index == m_currentPointIndex) {
 419                 if (m_currentPointIndex > 0)
 420                     m_spline.setPoint(m_currentPointIndex - 1, m_grabPPrevious);
 421                 if (m_currentPointIndex < m_spline.points().count() -1)
 422                     m_spline.setPoint(m_currentPointIndex + 1, m_grabPNext);
 423             } else {
 424                 if (m_currentPointIndex < index) {
 425                     m_spline.setPoint(index, m_grabPPrevious);
 426                     m_grabPNext = m_grabPPrevious;
 427                     if (m_currentPointIndex > 0)
 428                         m_grabPPrevious = m_spline.points()[m_currentPointIndex - 1];
 429                 } else {
 430                     m_spline.setPoint(index, m_grabPNext);
 431                     m_grabPPrevious = m_grabPNext;
 432                     if (m_currentPointIndex < m_spline.points().count() - 1)
 433                         m_grabPNext = m_spline.points()[m_currentPointIndex + 1];
 434                 }
 435             }
 436         }
 437
 438         emit currentPoint(point);
 439         update();
 440     }
 441 }
 442
 443 void BezierSplineEditor::leaveEvent(QEvent* event)
 444 {
 445     QWidget::leaveEvent(event);
 446 }
 447
 448 int BezierSplineEditor::nearestPointInRange(QPointF p, int wWidth, int wHeight, BezierSplineEditor::point_types* sel)
 449 {
 450     double nearestDistanceSquared = 1000;
 451     point_types selectedPoint;
 452     int nearestIndex = -1;
 453     int i = 0;
 454
 455     double distanceSquared;
 456     // find out distance using the Pythagorean theorem
 457     foreach(const BPoint & point, m_spline.points()) {
 458         for (int j = 0; j < 3; ++j) {
 459             distanceSquared = pow(point[j].x() - p.x(), 2) + pow(point[j].y() - p.y(), 2);
 460             if (distanceSquared < nearestDistanceSquared) {
 461                 nearestIndex = i;
 462                 nearestDistanceSquared = distanceSquared;
 463                 selectedPoint = (point_types)j;
 464             }
 465         }
 466         ++i;
 467     }
 468
 469     if (nearestIndex >= 0 && (nearestIndex == m_currentPointIndex || selectedPoint == PTypeP || m_showAllHandles)) {
 470         // a point was found and it is not a hidden handle
 471         BPoint point = m_spline.points()[nearestIndex];
 472         if (qAbs(p.x() - point[(int)selectedPoint].x()) * wWidth < 5 && qAbs(p.y() - point[(int)selectedPoint].y()) * wHeight < 5) {
 473             *sel = selectedPoint;
 474             return nearestIndex;
 475         }
 476     }
 477
 478     return -1;
 479 }
 480
 481 #include "beziersplineeditor.moc"