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