git.sesse.net Git - kdenlive/blob - src/beziercurve/beziersplinewidget.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 "beziersplinewidget.h"
  20
  21 #include <QPainter>
  22 #include <QMouseEvent>
  23
  24 #include <KDebug>
  25
  26 BezierSplineWidget::BezierSplineWidget(QWidget* parent) :
  27         QWidget(parent),
  28         m_mode(ModeNormal),
  29         m_currentPointIndex(-1)
  30 {
  31     setMouseTracking(true);
  32     setAutoFillBackground(false);
  33     setAttribute(Qt::WA_OpaquePaintEvent);
  34     setMinimumSize(150, 150);
  35     setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  36 }
  37
  38 CubicBezierSpline BezierSplineWidget::spline()
  39 {
  40     return m_spline;
  41 }
  42
  43 void BezierSplineWidget::setSpline(const CubicBezierSpline& spline)
  44 {
  45     // TODO: cleanup
  46     m_spline.fromString(spline.toString());
  47 }
  48
  49 void BezierSplineWidget::paintEvent(QPaintEvent* event)
  50 {
  51     Q_UNUSED(event);
  52
  53     QPainter p(this);
  54
  55     p.fillRect(rect(), palette().background());
  56
  57     int    wWidth = width() - 1;
  58     int    wHeight = height() - 1;
  59
  60     /*
  61      * Spline
  62      */
  63     double prevY = wHeight - m_spline.value(0.) * wHeight;
  64     double prevX = 0.;
  65     double curY;
  66     double normalizedX = -1;
  67     int x;
  68
  69     p.setPen(QPen(Qt::black, 1, Qt::SolidLine));
  70     for (x = 0 ; x < wWidth ; ++x) {
  71         normalizedX = x / (double)wWidth;
  72         curY = wHeight - m_spline.value(normalizedX, true) * wHeight;
  73
  74         /*
  75          * Keep in mind that QLineF rounds doubles
  76          * to ints mathematically, not just rounds down
  77          * like in C
  78          */
  79         p.drawLine(QLineF(prevX, prevY,
  80                           x, curY));
  81         prevX = x;
  82         prevY = curY;
  83     }
  84     p.drawLine(QLineF(prevX, prevY ,
  85                       x, wHeight - m_spline.value(1.0, true) * wHeight));
  86
  87     /*
  88      * Points + Handles
  89      */
  90     p.setPen(QPen(Qt::red, 1, Qt::SolidLine));
  91     BPoint point;
  92     QPolygon handle(4);
  93     handle.setPoints(4,
  94                      1,  -2,
  95                      4,  1,
  96                      1,  4,
  97                      -2, 1);
  98     for (int i = 0; i < m_spline.points().count(); ++i) {
  99         point = m_spline.points().at(i);
 100         if (i == m_currentPointIndex)
 101             p.setBrush(QBrush(QColor(Qt::red), Qt::SolidPattern));
 102
 103         p.drawConvexPolygon(handle.translated(point.h1.x() * wWidth, wHeight - point.h1.y() * wHeight));
 104         p.drawEllipse(QRectF(point.p.x() * wWidth - 3,
 105                             wHeight - 3 - point.p.y() * wHeight, 6, 6));
 106         p.drawConvexPolygon(handle.translated(point.h2.x() * wWidth, wHeight - point.h2.y() * wHeight));
 107
 108         if ( i == m_currentPointIndex)
 109             p.setBrush(QBrush(Qt::NoBrush));
 110     }
 111 }
 112
 113 void BezierSplineWidget::resizeEvent(QResizeEvent* event)
 114 {
 115     m_spline.setPrecision(width());
 116     QWidget::resizeEvent(event);
 117 }
 118
 119 void BezierSplineWidget::mousePressEvent(QMouseEvent* event)
 120 {
 121     double x = event->pos().x() / (double)(width() - 1);
 122     double y = 1.0 - event->pos().y() / (double)(height() - 1);
 123
 124     point_types selectedPoint;
 125     int closest_point_index = nearestPointInRange(QPointF(x, y), width(), height(), &selectedPoint);
 126
 127     /*if (event->button() == Qt::RightButton && closest_point_index > 0 && closest_point_index < d->m_curve.points().count() - 1) {
 128         d->m_curve.removePoint(closest_point_index);
 129         setCursor(Qt::ArrowCursor);
 130         d->setState(ST_NORMAL);
 131         if (closest_point_index < d->m_grab_point_index)
 132             --d->m_grab_point_index;
 133         d->setCurveModified();
 134         return;
 135     } else*/ if (event->button() != Qt::LeftButton) return;
 136
 137     if (closest_point_index < 0) {
 138         BPoint po;
 139         po.p = QPointF(x, y);
 140         po.h1 = QPointF(x-0.05, y-0.05);
 141         po.h2 = QPointF(x+0.05, y+0.05);
 142         m_currentPointIndex = m_spline.addPoint(po);
 143         m_currentPointType = PTypeP;
 144         if (m_currentPointIndex == -1) // x already in use
 145             return;
 146         /*if (!d->jumpOverExistingPoints(newPoint, -1)) return;*/
 147     } else {
 148         m_currentPointIndex = closest_point_index;
 149         m_currentPointType = selectedPoint;
 150     }
 151
 152     BPoint point = m_spline.points()[m_currentPointIndex];
 153     QPointF p;
 154     switch (m_currentPointType) {
 155     case PTypeH1:
 156         p = point.h1;
 157         break;
 158     case PTypeP:
 159         p = point.p;
 160         break;
 161     case PTypeH2:
 162         p = point.h2;
 163     }
 164
 165     m_grabOriginalX = p.x();
 166     m_grabOriginalY = p.y();
 167     m_grabOffsetX = p.x() - x;
 168     m_grabOffsetY = p.y() - y;
 169
 170     switch (m_currentPointType) {
 171         case PTypeH1:
 172             point.h1 = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 173             break;
 174         case PTypeP:
 175             point.p = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 176             break;
 177         case PTypeH2:
 178             point.h2 = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 179     }
 180     m_spline.setPoint(m_currentPointIndex, point);
 181
 182     //d->m_draggedAwayPointIndex = -1;
 183
 184     m_mode = ModeDrag;
 185
 186     update();
 187 }
 188
 189 void BezierSplineWidget::mouseReleaseEvent(QMouseEvent* event)
 190 {
 191     if (event->button() != Qt::LeftButton)
 192         return;
 193
 194     setCursor(Qt::ArrowCursor);
 195     m_mode = ModeNormal;
 196
 197     emit modified();
 198 }
 199
 200 void BezierSplineWidget::mouseMoveEvent(QMouseEvent* event)
 201 {
 202     double x = event->pos().x() / (double)(width() - 1);
 203     double y = 1.0 - event->pos().y() / (double)(height() - 1);
 204
 205     if (m_mode == ModeNormal) { // If no point is selected set the the cursor shape if on top
 206         point_types type;
 207         int nearestPointIndex = nearestPointInRange(QPointF(x, y), width(), height(), &type);
 208
 209         if (nearestPointIndex < 0)
 210             setCursor(Qt::ArrowCursor);
 211         else
 212             setCursor(Qt::CrossCursor);
 213     } else { // Else, drag the selected point
 214         /*bool crossedHoriz = event->pos().x() - width() > MOUSE_AWAY_THRES ||
 215         event->pos().x() < -MOUSE_AWAY_THRES;
 216         bool crossedVert =  event->pos().y() - height() > MOUSE_AWAY_THRES ||
 217         event->pos().y() < -MOUSE_AWAY_THRES;
 218
 219         bool removePoint = (crossedHoriz || crossedVert);
 220
 221         if (!removePoint && d->m_draggedAwayPointIndex >= 0) {
 222             // point is no longer dragged away so reinsert it
 223             QPointF newPoint(d->m_draggedAwayPoint);
 224             d->m_grab_point_index = d->m_curve.addPoint(newPoint);
 225             d->m_draggedAwayPointIndex = -1;
 226         }
 227
 228         if (removePoint &&
 229             (d->m_draggedAwayPointIndex >= 0))
 230             return;
 231         */
 232
 233         setCursor(Qt::CrossCursor);
 234
 235         x += m_grabOffsetX;
 236         y += m_grabOffsetY;
 237
 238         double leftX, rightX;
 239         BPoint point = m_spline.points()[m_currentPointIndex];
 240         switch (m_currentPointType) {
 241         case PTypeH1:
 242             rightX = point.p.x();
 243             if (m_currentPointIndex == 0)
 244                 leftX = -1000;
 245             else
 246                 leftX = m_spline.points()[m_currentPointIndex - 1].p.x();
 247             x = qBound(leftX, x, rightX);
 248             point.h1 = QPointF(x, y);
 249             break;
 250         case PTypeP:
 251             if (m_currentPointIndex == 0) {
 252                 leftX = 0.0;
 253                 rightX = 0.0;
 254                 /*if (d->m_curve.points().count() > 1)
 255                  *           rightX = d->m_curve.points()[d->m_grab_point_index + 1].x() - POINT_AREA;
 256                  *       else
 257                  *           rightX = 1.0;*/
 258             } else if (m_currentPointIndex == m_spline.points().count() - 1) {
 259                 leftX = 1.0;//m_spline.points()[m_currentPointIndex - 1].p.x();
 260                 rightX = 1.0;
 261             } else {
 262                 //// the 1E-4 addition so we can grab the dot later.
 263                 leftX = m_spline.points()[m_currentPointIndex - 1].p.x();// + POINT_AREA;
 264                 rightX = m_spline.points()[m_currentPointIndex + 1].p.x();// - POINT_AREA;
 265             }
 266             x = qBound(leftX, x, rightX);
 267             y = qBound(0., y, 1.);
 268             point.p = QPointF(x, y);
 269             break;
 270         case PTypeH2:
 271             leftX = point.p.x();
 272             if (m_currentPointIndex == m_spline.points().count() - 1)
 273                 rightX = 1001;
 274             else
 275                 rightX = m_spline.points()[m_currentPointIndex + 1].p.x();
 276             x = qBound(leftX, x, rightX);
 277             point.h2 = QPointF(x, y);
 278         };
 279
 280         m_spline.setPoint(m_currentPointIndex, point);
 281
 282         /*if (removePoint && d->m_curve.points().count() > 2) {
 283             d->m_draggedAwayPoint = d->m_curve.points()[d->m_grab_point_index];
 284             d->m_draggedAwayPointIndex = d->m_grab_point_index;
 285             d->m_curve.removePoint(d->m_grab_point_index);
 286             d->m_grab_point_index = bounds(d->m_grab_point_index, 0, d->m_curve.points().count() - 1);
 287         }
 288
 289         d->setCurveModified();*/
 290         update();
 291     }
 292 }
 293
 294 void BezierSplineWidget::leaveEvent(QEvent* event)
 295 {
 296     QWidget::leaveEvent(event);
 297 }
 298
 299 int BezierSplineWidget::nearestPointInRange(QPointF p, int wWidth, int wHeight, BezierSplineWidget::point_types* sel)
 300 {
 301     double nearestDistanceSquared = 1000;
 302     point_types selectedPoint;
 303     int nearestIndex = -1;
 304     int i = 0;
 305
 306     double distanceSquared;
 307     foreach(const BPoint & point, m_spline.points()) {
 308         distanceSquared = pow(point.h1.x() - p.x(), 2) + pow(point.h1.y() - p.y(), 2);
 309         if (distanceSquared < nearestDistanceSquared) {
 310             nearestIndex = i;
 311             nearestDistanceSquared = distanceSquared;
 312             selectedPoint = PTypeH1;
 313         }
 314         distanceSquared = pow(point.p.x() - p.x(), 2) + pow(point.p.y() - p.y(), 2);
 315         if (distanceSquared < nearestDistanceSquared) {
 316             nearestIndex = i;
 317             nearestDistanceSquared = distanceSquared;
 318             selectedPoint = PTypeP;
 319         }
 320         distanceSquared = pow(point.h2.x() - p.x(), 2) + pow(point.h2.y() - p.y(), 2);
 321         if (distanceSquared < nearestDistanceSquared) {
 322             nearestIndex = i;
 323             nearestDistanceSquared = distanceSquared;
 324             selectedPoint = PTypeH2;
 325         }
 326         ++i;
 327     }
 328
 329     if (nearestIndex >= 0) {
 330         BPoint point = m_spline.points()[nearestIndex];
 331         QPointF p2;
 332         switch (selectedPoint) {
 333         case PTypeH1:
 334             p2 = point.h1;
 335             break;
 336         case PTypeP:
 337             p2 = point.p;
 338             break;
 339         case PTypeH2:
 340             p2 = point.h2;
 341         }
 342         if (qAbs(p.x() - p2.x()) * (wWidth - 1) < 5 && qAbs(p.y() - p2.y()) * (wHeight - 1) < 5) {
 343             *sel = selectedPoint;
 344             return nearestIndex;
 345         }
 346     }
 347
 348     return -1;
 349 }
 350
 351 #include "beziersplinewidget.moc"