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 currentPoint(BPoint());
  60     emit modified();
  61     update();
  62 }
  63
  64 BPoint BezierSplineEditor::getCurrentPoint()
  65 {
  66     if (m_currentPointIndex >= 0)
  67         return m_spline.points()[m_currentPointIndex];
  68     else
  69         return BPoint();
  70 }
  71
  72 void BezierSplineEditor::updateCurrentPoint(const BPoint& p)
  73 {
  74     if (m_currentPointIndex >= 0) {
  75         m_spline.setPoint(m_currentPointIndex, p);
  76         // during validation the point might have changed
  77         emit currentPoint(m_spline.points()[m_currentPointIndex]);
  78         emit modified();
  79         update();
  80     }
  81 }
  82
  83 void BezierSplineEditor::setPixmap(const QPixmap& pixmap)
  84 {
  85     m_pixmap = pixmap;
  86     m_pixmapIsDirty = true;
  87     update();
  88 }
  89
  90 void BezierSplineEditor::slotZoomIn()
  91 {
  92     m_zoomLevel = qMax(m_zoomLevel-1, 0);
  93     m_pixmapIsDirty = true;
  94     update();
  95 }
  96
  97 void BezierSplineEditor::slotZoomOut()
  98 {
  99     m_zoomLevel = qMin(m_zoomLevel+1, 3);
 100     m_pixmapIsDirty = true;
 101     update();
 102 }
 103
 104 int BezierSplineEditor::gridLines()
 105 {
 106     return m_gridLines;
 107 }
 108
 109 void BezierSplineEditor::setGridLines(int lines)
 110 {
 111     m_gridLines = qBound(0, lines, 8);
 112     update();
 113 }
 114
 115 void BezierSplineEditor::paintEvent(QPaintEvent* event)
 116 {
 117     Q_UNUSED(event);
 118
 119     QPainter p(this);
 120
 121     int wWidth = width() - 1;
 122     int wHeight = height() - 1;
 123     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 124     wWidth -= 2 * offset;
 125     wHeight -= 2 * offset;
 126
 127     p.translate(offset, offset);
 128
 129     /*
 130      * Background
 131      */
 132     p.fillRect(rect().translated(-offset, -offset), palette().background());
 133     if (!m_pixmap.isNull()) {
 134         if (m_pixmapIsDirty || !m_pixmapCache) {
 135             if (m_pixmapCache)
 136                 delete m_pixmapCache;
 137             m_pixmapCache = new QPixmap(wWidth + 1, wHeight + 1);
 138             QPainter cachePainter(m_pixmapCache);
 139
 140             cachePainter.scale(1.0*(wWidth+1) / m_pixmap.width(), 1.0*(wHeight+1) / m_pixmap.height());
 141             cachePainter.drawPixmap(0, 0, m_pixmap);
 142             m_pixmapIsDirty = false;
 143         }
 144         p.drawPixmap(0, 0, *m_pixmapCache);
 145     }
 146
 147
 148     p.setPen(QPen(Qt::gray, 1, Qt::SolidLine));
 149
 150     /*
 151      * Borders
 152      */
 153     if (m_zoomLevel != 0) {
 154         p.drawRect(0, 0, wWidth, wHeight);
 155     }
 156
 157     /*
 158      * Grid
 159      */
 160     if (m_gridLines != 0) {
 161         double stepH = wWidth / (double)(m_gridLines + 1);
 162         double stepV = wHeight / (double)(m_gridLines + 1);
 163         for (int i = 1; i <= m_gridLines; ++i) {
 164             p.drawLine(QLineF(i * stepH, 0, i * stepH, wHeight));
 165             p.drawLine(QLineF(0, i * stepV, wWidth, i * stepV));
 166         }
 167     }
 168
 169     p.setRenderHint(QPainter::Antialiasing);
 170
 171     /*
 172      * Standard line
 173      */
 174     p.drawLine(QLineF(0, wHeight, wWidth, 0));
 175
 176     /*
 177      * Spline
 178      */
 179     double prevY = wHeight - m_spline.value(0.) * wHeight;
 180     double prevX = 0.;
 181     double curY;
 182     double normalizedX = -1;
 183     int x;
 184
 185     p.setPen(QPen(Qt::black, 1, Qt::SolidLine));
 186     for (x = 0 ; x < wWidth ; ++x) {
 187         normalizedX = x / (double)wWidth;
 188         curY = wHeight - m_spline.value(normalizedX, true) * wHeight;
 189
 190         /*
 191          * Keep in mind that QLineF rounds doubles
 192          * to ints mathematically, not just rounds down
 193          * like in C
 194          */
 195         p.drawLine(QLineF(prevX, prevY, x, curY));
 196         prevX = x;
 197         prevY = curY;
 198     }
 199     p.drawLine(QLineF(prevX, prevY ,
 200                       x, wHeight - m_spline.value(1.0, true) * wHeight));
 201
 202     /*
 203      * Points + Handles
 204      */
 205     int max = m_spline.points().count() - 1;
 206     p.setPen(QPen(Qt::red, 1, Qt::SolidLine));
 207     BPoint point;
 208     QPolygon handle(4);
 209     handle.setPoints(4,
 210                      1,  -2,
 211                      4,  1,
 212                      1,  4,
 213                      -2, 1);
 214 #if QT_VERSION < 0x040600
 215     QPolygon tmp;
 216 #endif
 217     for (int i = 0; i <= max; ++i) {
 218         point = m_spline.points().at(i);
 219         if (i == m_currentPointIndex) {
 220             // selected point: fill p and handles
 221             p.setBrush(QBrush(QColor(Qt::red), Qt::SolidPattern));
 222             // connect p and handles with lines
 223             if (i != 0)
 224                 p.drawLine(QLineF(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight, point.p.x() * wWidth, wHeight - point.p.y() * wHeight));
 225             if (i != max)
 226                 p.drawLine(QLineF(point.p.x() * wWidth, wHeight - point.p.y() * wHeight, point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight));
 227         }
 228
 229         p.drawEllipse(QRectF(point.p.x() * wWidth - 3,
 230                              wHeight - 3 - point.p.y() * wHeight, 6, 6));
 231         if (i != 0) {
 232 #if QT_VERSION >= 0x040600
 233             p.drawConvexPolygon(handle.translated(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight));
 234 #else
 235             tmp = handle;
 236             tmp.translate(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight);
 237             p.drawConvexPolygon(tmp);
 238 #endif
 239         }
 240         if (i != max) {
 241 #if QT_VERSION >= 0x040600
 242             p.drawConvexPolygon(handle.translated(point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight));
 243 #else
 244             tmp = handle;
 245             tmp.translate(point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight);
 246             p.drawConvexPolygon(tmp);
 247 #endif
 248         }
 249
 250         if ( i == m_currentPointIndex)
 251             p.setBrush(QBrush(Qt::NoBrush));
 252     }
 253 }
 254
 255 void BezierSplineEditor::resizeEvent(QResizeEvent* event)
 256 {
 257     m_spline.setPrecision(width() > height() ? width() : height());
 258     m_pixmapIsDirty = true;
 259     QWidget::resizeEvent(event);
 260 }
 261
 262 void BezierSplineEditor::mousePressEvent(QMouseEvent* event)
 263 {
 264     int wWidth = width() - 1;
 265     int wHeight = height() - 1;
 266     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 267     wWidth -= 2 * offset;
 268     wHeight -= 2 * offset;
 269
 270     double x = (event->pos().x() - offset) / (double)(wWidth);
 271     double y = 1.0 - (event->pos().y() - offset) / (double)(wHeight);
 272
 273     point_types selectedPoint;
 274     int closestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &selectedPoint);
 275
 276     if (event->button() == Qt::RightButton && closestPointIndex > 0 && closestPointIndex < m_spline.points().count() - 1 && selectedPoint == PTypeP) {
 277         m_spline.removePoint(closestPointIndex);
 278         setCursor(Qt::ArrowCursor);
 279         m_mode = ModeNormal;
 280         if (closestPointIndex < m_currentPointIndex)
 281             --m_currentPointIndex;
 282         update();
 283         if (m_currentPointIndex >= 0)
 284             emit currentPoint(m_spline.points()[m_currentPointIndex]);
 285         else
 286             emit currentPoint(BPoint());
 287         emit modified();
 288         return;
 289     } else if (event->button() != Qt::LeftButton) {
 290         return;
 291     }
 292
 293     if (closestPointIndex < 0) {
 294         m_currentPointIndex = m_spline.addPoint(BPoint(QPointF(x-0.05, y-0.05),
 295                                                        QPointF(x, y),
 296                                                        QPointF(x+0.05, y+0.05)));
 297         m_currentPointType = PTypeP;
 298     } else {
 299         m_currentPointIndex = closestPointIndex;
 300         m_currentPointType = selectedPoint;
 301     }
 302
 303     BPoint point = m_spline.points()[m_currentPointIndex];
 304
 305     m_grabPOriginal = point;
 306     if (m_currentPointIndex > 0)
 307         m_grabPPrevious = m_spline.points()[m_currentPointIndex - 1];
 308     if (m_currentPointIndex < m_spline.points().count() - 1)
 309         m_grabPNext = m_spline.points()[m_currentPointIndex + 1];
 310     m_grabOffsetX = point[(int)m_currentPointType].x() - x;
 311     m_grabOffsetY = point[(int)m_currentPointType].y() - y;
 312
 313     point[(int)m_currentPointType] = 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 = -4;
 369             else
 370                 leftX = m_spline.points()[m_currentPointIndex - 1].p.x();
 371
 372             x = qBound(leftX, x, rightX);
 373             point.setH1(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 move by same offset
 390             // (using update handle in point.setP won't work because the offset between new and old point is very small)
 391             point.h1 += QPointF(x, y) - m_grabPOriginal.p;
 392             point.h2 += QPointF(x, y) - m_grabPOriginal.p;
 393
 394             point.setP(QPointF(x, y), false);
 395             break;
 396
 397         case PTypeH2:
 398             leftX = point.p.x();
 399             if (m_currentPointIndex == m_spline.points().count() - 1)
 400                 rightX = 5;
 401             else
 402                 rightX = m_spline.points()[m_currentPointIndex + 1].p.x();
 403
 404             x = qBound(leftX, x, rightX);
 405             point.setH2(QPointF(x, y));
 406         };
 407
 408         int index = m_currentPointIndex;
 409         m_currentPointIndex = m_spline.setPoint(m_currentPointIndex, point);
 410
 411         if (m_currentPointType == PTypeP) {
 412             // we might have changed the handles of other points
 413             // try to restore
 414             if (index == m_currentPointIndex) {
 415                 if (m_currentPointIndex > 0)
 416                     m_spline.setPoint(m_currentPointIndex - 1, m_grabPPrevious);
 417                 if (m_currentPointIndex < m_spline.points().count() -1)
 418                     m_spline.setPoint(m_currentPointIndex + 1, m_grabPNext);
 419             } else {
 420                 if (m_currentPointIndex < index) {
 421                     m_spline.setPoint(index, m_grabPPrevious);
 422                     m_grabPNext = m_grabPPrevious;
 423                     if (m_currentPointIndex > 0)
 424                         m_grabPPrevious = m_spline.points()[m_currentPointIndex - 1];
 425                 } else {
 426                     m_spline.setPoint(index, m_grabPNext);
 427                     m_grabPPrevious = m_grabPNext;
 428                     if (m_currentPointIndex < m_spline.points().count() - 1)
 429                         m_grabPNext = m_spline.points()[m_currentPointIndex + 1];
 430                 }
 431             }
 432         }
 433
 434         emit currentPoint(point);
 435         update();
 436     }
 437 }
 438
 439 void BezierSplineEditor::leaveEvent(QEvent* event)
 440 {
 441     QWidget::leaveEvent(event);
 442 }
 443
 444 int BezierSplineEditor::nearestPointInRange(QPointF p, int wWidth, int wHeight, BezierSplineEditor::point_types* sel)
 445 {
 446     double nearestDistanceSquared = 1000;
 447     point_types selectedPoint;
 448     int nearestIndex = -1;
 449     int i = 0;
 450
 451     double distanceSquared;
 452     // find out distance using the Pythagorean theorem
 453     foreach(const BPoint & point, m_spline.points()) {
 454         for (int j = 0; j < 3; ++j) {
 455             distanceSquared = pow(point[j].x() - p.x(), 2) + pow(point[j].y() - p.y(), 2);
 456             if (distanceSquared < nearestDistanceSquared) {
 457                 nearestIndex = i;
 458                 nearestDistanceSquared = distanceSquared;
 459                 selectedPoint = (point_types)j;
 460             }
 461         }
 462         ++i;
 463     }
 464
 465     if (nearestIndex >= 0) {
 466         BPoint point = m_spline.points()[nearestIndex];
 467         if (qAbs(p.x() - point[(int)selectedPoint].x()) * wWidth < 5 && qAbs(p.y() - point[(int)selectedPoint].y()) * wHeight < 5) {
 468             *sel = selectedPoint;
 469             return nearestIndex;
 470         }
 471     }
 472
 473     return -1;
 474 }
 475
 476 #include "beziersplineeditor.moc"