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     // TODO: cleanup
  55     m_spline.fromString(spline.toString());
  56 }
  57
  58 BPoint BezierSplineEditor::getCurrentPoint()
  59 {
  60     if (m_currentPointIndex >= 0)
  61         return m_spline.points()[m_currentPointIndex];
  62     else
  63         return BPoint();
  64 }
  65
  66 void BezierSplineEditor::updateCurrentPoint(const BPoint& p)
  67 {
  68     if (m_currentPointIndex >= 0) {
  69         m_spline.setPoint(m_currentPointIndex, p);
  70         // during validation the point might have changed
  71         emit currentPoint(m_spline.points()[m_currentPointIndex]);
  72         update();
  73     }
  74 }
  75
  76 void BezierSplineEditor::setPixmap(const QPixmap& pixmap)
  77 {
  78     m_pixmap = pixmap;
  79     m_pixmapIsDirty = true;
  80     update();
  81 }
  82
  83 void BezierSplineEditor::slotZoomIn()
  84 {
  85     m_zoomLevel = qMax(m_zoomLevel-1, 0);
  86     m_pixmapIsDirty = true;
  87     update();
  88 }
  89
  90 void BezierSplineEditor::slotZoomOut()
  91 {
  92     m_zoomLevel = qMin(m_zoomLevel+1, 3);
  93     m_pixmapIsDirty = true;
  94     update();
  95 }
  96
  97 int BezierSplineEditor::gridLines()
  98 {
  99     return m_gridLines;
 100 }
 101
 102 void BezierSplineEditor::setGridLines(int lines)
 103 {
 104     m_gridLines = qBound(0, lines, 8);
 105     update();
 106 }
 107
 108 void BezierSplineEditor::paintEvent(QPaintEvent* event)
 109 {
 110     Q_UNUSED(event);
 111
 112     QPainter p(this);
 113
 114     int wWidth = width() - 1;
 115     int wHeight = height() - 1;
 116     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 117     wWidth -= 2 * offset;
 118     wHeight -= 2 * offset;
 119
 120     p.translate(offset, offset);
 121
 122     /*
 123      * Background
 124      */
 125     p.fillRect(rect().translated(-offset, -offset), palette().background());
 126     if (!m_pixmap.isNull()) {
 127         if (m_pixmapIsDirty || !m_pixmapCache) {
 128             if (m_pixmapCache)
 129                 delete m_pixmapCache;
 130             m_pixmapCache = new QPixmap(wWidth + 1, wHeight + 1);
 131             QPainter cachePainter(m_pixmapCache);
 132
 133             cachePainter.scale(1.0*(wWidth+1) / m_pixmap.width(), 1.0*(wHeight+1) / m_pixmap.height());
 134             cachePainter.drawPixmap(0, 0, m_pixmap);
 135             m_pixmapIsDirty = false;
 136         }
 137         p.drawPixmap(0, 0, *m_pixmapCache);
 138     }
 139
 140
 141     p.setPen(QPen(Qt::gray, 1, Qt::SolidLine));
 142
 143     /*
 144      * Borders
 145      */
 146     if (m_zoomLevel != 0) {
 147         p.drawRect(0, 0, wWidth, wHeight);
 148     }
 149
 150     /*
 151      * Grid
 152      */
 153     if (m_gridLines != 0) {
 154         double stepH = wWidth / (double)(m_gridLines + 1);
 155         double stepV = wHeight / (double)(m_gridLines + 1);
 156         for (int i = 1; i <= m_gridLines; ++i) {
 157             p.drawLine(QLineF(i * stepH, 0, i * stepH, wHeight));
 158             p.drawLine(QLineF(0, i * stepV, wWidth, i * stepV));
 159         }
 160     }
 161
 162     p.setRenderHint(QPainter::Antialiasing);
 163
 164     /*
 165      * Standard line
 166      */
 167     p.drawLine(QLineF(0, wHeight, wWidth, 0));
 168
 169     /*
 170      * Spline
 171      */
 172     double prevY = wHeight - m_spline.value(0.) * wHeight;
 173     double prevX = 0.;
 174     double curY;
 175     double normalizedX = -1;
 176     int x;
 177
 178     p.setPen(QPen(Qt::black, 1, Qt::SolidLine));
 179     for (x = 0 ; x < wWidth ; ++x) {
 180         normalizedX = x / (double)wWidth;
 181         curY = wHeight - m_spline.value(normalizedX, true) * wHeight;
 182
 183         /*
 184          * Keep in mind that QLineF rounds doubles
 185          * to ints mathematically, not just rounds down
 186          * like in C
 187          */
 188         p.drawLine(QLineF(prevX, prevY, x, curY));
 189         prevX = x;
 190         prevY = curY;
 191     }
 192     p.drawLine(QLineF(prevX, prevY ,
 193                       x, wHeight - m_spline.value(1.0, true) * wHeight));
 194
 195     /*
 196      * Points + Handles
 197      */
 198     int max = m_spline.points().count() - 1;
 199     p.setPen(QPen(Qt::red, 1, Qt::SolidLine));
 200     BPoint point;
 201     QPolygon handle(4);
 202     handle.setPoints(4,
 203                      1,  -2,
 204                      4,  1,
 205                      1,  4,
 206                      -2, 1);
 207     for (int i = 0; i <= max; ++i) {
 208         point = m_spline.points().at(i);
 209         if (i == m_currentPointIndex) {
 210             p.setBrush(QBrush(QColor(Qt::red), Qt::SolidPattern));
 211             if (i != 0)
 212                 p.drawLine(QLineF(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight, point.p.x() * wWidth, wHeight - point.p.y() * wHeight));
 213             if (i != max)
 214                 p.drawLine(QLineF(point.p.x() * wWidth, wHeight - point.p.y() * wHeight, point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight));
 215         }
 216
 217         p.drawEllipse(QRectF(point.p.x() * wWidth - 3,
 218                              wHeight - 3 - point.p.y() * wHeight, 6, 6));
 219         if (i != 0)
 220             p.drawConvexPolygon(handle.translated(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight));
 221         if (i != max)
 222             p.drawConvexPolygon(handle.translated(point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight));
 223
 224         if ( i == m_currentPointIndex)
 225             p.setBrush(QBrush(Qt::NoBrush));
 226     }
 227 }
 228
 229 void BezierSplineEditor::resizeEvent(QResizeEvent* event)
 230 {
 231     m_spline.setPrecision(width());
 232     m_pixmapIsDirty = true;
 233     QWidget::resizeEvent(event);
 234 }
 235
 236 void BezierSplineEditor::mousePressEvent(QMouseEvent* event)
 237 {
 238     int wWidth = width() - 1;
 239     int wHeight = height() - 1;
 240     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 241     wWidth -= 2 * offset;
 242     wHeight -= 2 * offset;
 243
 244     double x = (event->pos().x() - offset) / (double)(wWidth);
 245     double y = 1.0 - (event->pos().y() - offset) / (double)(wHeight);
 246
 247     point_types selectedPoint;
 248     int closestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &selectedPoint);
 249
 250     if (event->button() == Qt::RightButton && closestPointIndex > 0 && closestPointIndex < m_spline.points().count() - 1 && selectedPoint == PTypeP) {
 251         m_spline.removePoint(closestPointIndex);
 252         setCursor(Qt::ArrowCursor);
 253         m_mode = ModeNormal;
 254         if (closestPointIndex < m_currentPointIndex)
 255             --m_currentPointIndex;
 256         update();
 257         if (m_currentPointIndex >= 0)
 258             emit currentPoint(m_spline.points()[m_currentPointIndex]);
 259         else
 260             emit currentPoint(BPoint());
 261         emit modified();
 262         return;
 263     } else if (event->button() != Qt::LeftButton) {
 264         return;
 265     }
 266
 267     if (closestPointIndex < 0) {
 268         BPoint po;
 269         po.p = QPointF(x, y);
 270         po.h1 = QPointF(x-0.05, y-0.05);
 271         po.h2 = QPointF(x+0.05, y+0.05);
 272         m_currentPointIndex = m_spline.addPoint(po);
 273         m_currentPointType = PTypeP;
 274     } else {
 275         m_currentPointIndex = closestPointIndex;
 276         m_currentPointType = selectedPoint;
 277     }
 278
 279     BPoint point = m_spline.points()[m_currentPointIndex];
 280     QPointF p;
 281     switch (m_currentPointType) {
 282     case PTypeH1:
 283         p = point.h1;
 284         break;
 285     case PTypeP:
 286         p = point.p;
 287         break;
 288     case PTypeH2:
 289         p = point.h2;
 290     }
 291
 292     m_grabPOriginal = point;
 293     if (m_currentPointIndex > 0)
 294         m_grabPPrevious = m_spline.points()[m_currentPointIndex - 1];
 295     if (m_currentPointIndex < m_spline.points().count() - 1)
 296         m_grabPNext = m_spline.points()[m_currentPointIndex + 1];
 297     m_grabOffsetX = p.x() - x;
 298     m_grabOffsetY = p.y() - y;
 299
 300     switch (m_currentPointType) {
 301         case PTypeH1:
 302             point.h1 = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 303             break;
 304         case PTypeP:
 305             point.p = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 306             break;
 307         case PTypeH2:
 308             point.h2 = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 309     }
 310     m_spline.setPoint(m_currentPointIndex, point);
 311
 312     m_mode = ModeDrag;
 313
 314     emit currentPoint(point);
 315     update();
 316 }
 317
 318 void BezierSplineEditor::mouseReleaseEvent(QMouseEvent* event)
 319 {
 320     if (event->button() != Qt::LeftButton)
 321         return;
 322
 323     setCursor(Qt::ArrowCursor);
 324     m_mode = ModeNormal;
 325
 326     emit modified();
 327 }
 328
 329 void BezierSplineEditor::mouseMoveEvent(QMouseEvent* event)
 330 {
 331     int wWidth = width() - 1;
 332     int wHeight = height() - 1;
 333     int offset = 1/8. * m_zoomLevel * (wWidth > wHeight ? wWidth : wHeight);
 334     wWidth -= 2 * offset;
 335     wHeight -= 2 * offset;
 336
 337     double x = (event->pos().x() - offset) / (double)(wWidth);
 338     double y = 1.0 - (event->pos().y() - offset) / (double)(wHeight);
 339
 340     if (m_mode == ModeNormal) {
 341         // If no point is selected set the the cursor shape if on top
 342         point_types type;
 343         int nearestPointIndex = nearestPointInRange(QPointF(x, y), wWidth, wHeight, &type);
 344
 345         if (nearestPointIndex < 0)
 346             setCursor(Qt::ArrowCursor);
 347         else
 348             setCursor(Qt::CrossCursor);
 349     } else {
 350         // Else, drag the selected point
 351         setCursor(Qt::CrossCursor);
 352
 353         x += m_grabOffsetX;
 354         y += m_grabOffsetY;
 355
 356         double leftX = 0.;
 357         double rightX = 1.;
 358         BPoint point = m_spline.points()[m_currentPointIndex];
 359         switch (m_currentPointType) {
 360         case PTypeH1:
 361             rightX = point.p.x();
 362             if (m_currentPointIndex == 0)
 363                 leftX = -1000;
 364             else
 365                 leftX = m_spline.points()[m_currentPointIndex - 1].p.x();
 366
 367             x = qBound(leftX, x, rightX);
 368             point.h1 = QPointF(x, y);
 369             break;
 370
 371         case PTypeP:
 372             if (m_currentPointIndex == 0)
 373                 rightX = 0.0;
 374             else if (m_currentPointIndex == m_spline.points().count() - 1)
 375                 leftX = 1.0;
 376
 377             x = qBound(leftX, x, rightX);
 378             y = qBound(0., y, 1.);
 379
 380             // handles might have changed because we neared another point
 381             // try to restore
 382             point.h1 = m_grabPOriginal.h1;
 383             point.h2 = m_grabPOriginal.h2;
 384             // and then move them by same offset
 385             point.h1 += QPointF(x, y) - m_grabPOriginal.p;
 386             point.h2 += QPointF(x, y) - m_grabPOriginal.p;
 387
 388             point.p = QPointF(x, y);
 389             break;
 390
 391         case PTypeH2:
 392             leftX = point.p.x();
 393             if (m_currentPointIndex == m_spline.points().count() - 1)
 394                 rightX = 1001;
 395             else
 396                 rightX = m_spline.points()[m_currentPointIndex + 1].p.x();
 397
 398             x = qBound(leftX, x, rightX);
 399             point.h2 = QPointF(x, y);
 400         };
 401
 402         int index = m_currentPointIndex;
 403         m_currentPointIndex = m_spline.setPoint(m_currentPointIndex, point);
 404
 405         if (m_currentPointType == PTypeP) {
 406             // we might have changed the handles of other points
 407             // try to restore
 408             if (index == m_currentPointIndex) {
 409                 if (m_currentPointIndex > 0)
 410                     m_spline.setPoint(m_currentPointIndex - 1, m_grabPPrevious);
 411                 if (m_currentPointIndex < m_spline.points().count() -1)
 412                     m_spline.setPoint(m_currentPointIndex + 1, m_grabPNext);
 413             } else {
 414                 if (m_currentPointIndex < index) {
 415                     m_spline.setPoint(index, m_grabPPrevious);
 416                     m_grabPNext = m_grabPPrevious;
 417                     if (m_currentPointIndex > 0)
 418                         m_grabPPrevious = m_spline.points()[m_currentPointIndex - 1];
 419                 } else {
 420                     m_spline.setPoint(index, m_grabPNext);
 421                     m_grabPPrevious = m_grabPNext;
 422                     if (m_currentPointIndex < m_spline.points().count() - 1)
 423                         m_grabPNext = m_spline.points()[m_currentPointIndex + 1];
 424                 }
 425             }
 426         }
 427
 428         emit currentPoint(point);
 429         update();
 430     }
 431 }
 432
 433 void BezierSplineEditor::leaveEvent(QEvent* event)
 434 {
 435     QWidget::leaveEvent(event);
 436 }
 437
 438 int BezierSplineEditor::nearestPointInRange(QPointF p, int wWidth, int wHeight, BezierSplineEditor::point_types* sel)
 439 {
 440     double nearestDistanceSquared = 1000;
 441     point_types selectedPoint;
 442     int nearestIndex = -1;
 443     int i = 0;
 444
 445     double distanceSquared;
 446     // find out distance using the Pythagorean theorem
 447     foreach(const BPoint & point, m_spline.points()) {
 448         distanceSquared = pow(point.h1.x() - p.x(), 2) + pow(point.h1.y() - p.y(), 2);
 449         if (distanceSquared < nearestDistanceSquared) {
 450             nearestIndex = i;
 451             nearestDistanceSquared = distanceSquared;
 452             selectedPoint = PTypeH1;
 453         }
 454         distanceSquared = pow(point.p.x() - p.x(), 2) + pow(point.p.y() - p.y(), 2);
 455         if (distanceSquared < nearestDistanceSquared) {
 456             nearestIndex = i;
 457             nearestDistanceSquared = distanceSquared;
 458             selectedPoint = PTypeP;
 459         }
 460         distanceSquared = pow(point.h2.x() - p.x(), 2) + pow(point.h2.y() - p.y(), 2);
 461         if (distanceSquared < nearestDistanceSquared) {
 462             nearestIndex = i;
 463             nearestDistanceSquared = distanceSquared;
 464             selectedPoint = PTypeH2;
 465         }
 466         ++i;
 467     }
 468
 469     if (nearestIndex >= 0) {
 470         BPoint point = m_spline.points()[nearestIndex];
 471         QPointF p2;
 472         switch (selectedPoint) {
 473         case PTypeH1:
 474             p2 = point.h1;
 475             break;
 476         case PTypeP:
 477             p2 = point.p;
 478             break;
 479         case PTypeH2:
 480             p2 = point.h2;
 481         }
 482         if (qAbs(p.x() - p2.x()) * wWidth < 5 && qAbs(p.y() - p2.y()) * wHeight < 5) {
 483             *sel = selectedPoint;
 484             return nearestIndex;
 485         }
 486     }
 487
 488     return -1;
 489 }
 490
 491 #include "beziersplineeditor.moc"