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