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     for (int i = 0; i < m_spline.points().count(); ++i) {
  90         point = m_spline.points().at(i);
  91         p.drawEllipse(QRectF(point.h1.x() * wWidth - 3,
  92                             wHeight - 3 - point.h1.y() * wHeight, 6, 6));
  93         p.drawEllipse(QRectF(point.p.x() * wWidth - 3,
  94                              wHeight - 3 - point.p.y() * wHeight, 6, 6));
  95         p.drawEllipse(QRectF(point.h2.x() * wWidth - 3,
  96                              wHeight - 3 - point.h2.y() * wHeight, 6, 6));
  97     }
  98 }
  99
 100 void BezierSplineWidget::resizeEvent(QResizeEvent* event)
 101 {
 102     m_spline.setPrecision(width());
 103     QWidget::resizeEvent(event);
 104 }
 105
 106 void BezierSplineWidget::mousePressEvent(QMouseEvent* event)
 107 {
 108     double x = event->pos().x() / (double)(width() - 1);
 109     double y = 1.0 - event->pos().y() / (double)(height() - 1);
 110
 111     point_types selectedPoint;
 112     int closest_point_index = nearestPointInRange(QPointF(x, y), width(), height(), &selectedPoint);
 113
 114     /*if (event->button() == Qt::RightButton && closest_point_index > 0 && closest_point_index < d->m_curve.points().count() - 1) {
 115         d->m_curve.removePoint(closest_point_index);
 116         setCursor(Qt::ArrowCursor);
 117         d->setState(ST_NORMAL);
 118         if (closest_point_index < d->m_grab_point_index)
 119             --d->m_grab_point_index;
 120         d->setCurveModified();
 121         return;
 122     } else*/ if (event->button() != Qt::LeftButton) return;
 123
 124     if (closest_point_index < 0) {
 125         BPoint po;
 126         po.p = QPointF(x, y);
 127         po.h1 = QPointF(x-0.05, y-0.05);
 128         po.h2 = QPointF(x+0.05, y+0.05);
 129         m_currentPointIndex = m_spline.addPoint(po);
 130         m_currentPointType = PTypeP;
 131         if (m_currentPointIndex == -1) // x already in use
 132             return;
 133         /*if (!d->jumpOverExistingPoints(newPoint, -1)) return;*/
 134     } else {
 135         m_currentPointIndex = closest_point_index;
 136         m_currentPointType = selectedPoint;
 137     }
 138
 139     BPoint point = m_spline.points()[m_currentPointIndex];
 140     QPointF p;
 141     switch (m_currentPointType) {
 142     case PTypeH1:
 143         p = point.h1;
 144         break;
 145     case PTypeP:
 146         p = point.p;
 147         break;
 148     case PTypeH2:
 149         p = point.h2;
 150     }
 151
 152     m_grabOriginalX = p.x();
 153     m_grabOriginalY = p.y();
 154     m_grabOffsetX = p.x() - x;
 155     m_grabOffsetY = p.y() - y;
 156
 157     switch (m_currentPointType) {
 158         case PTypeH1:
 159             point.h1 = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 160             break;
 161         case PTypeP:
 162             point.p = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 163             break;
 164         case PTypeH2:
 165             point.h2 = QPointF(x + m_grabOffsetX, y + m_grabOffsetY);
 166     }
 167     m_spline.setPoint(m_currentPointIndex, point);
 168
 169     //d->m_draggedAwayPointIndex = -1;
 170
 171     m_mode = ModeDrag;
 172
 173     update();
 174 }
 175
 176 void BezierSplineWidget::mouseReleaseEvent(QMouseEvent* event)
 177 {
 178     if (event->button() != Qt::LeftButton)
 179         return;
 180
 181     setCursor(Qt::ArrowCursor);
 182     m_mode = ModeNormal;
 183
 184     emit modified();
 185 }
 186
 187 void BezierSplineWidget::mouseMoveEvent(QMouseEvent* event)
 188 {
 189     double x = event->pos().x() / (double)(width() - 1);
 190     double y = 1.0 - event->pos().y() / (double)(height() - 1);
 191
 192     if (m_mode == ModeNormal) { // If no point is selected set the the cursor shape if on top
 193         point_types type;
 194         int nearestPointIndex = nearestPointInRange(QPointF(x, y), width(), height(), &type);
 195
 196         if (nearestPointIndex < 0)
 197             setCursor(Qt::ArrowCursor);
 198         else
 199             setCursor(Qt::CrossCursor);
 200     } else { // Else, drag the selected point
 201         /*bool crossedHoriz = event->pos().x() - width() > MOUSE_AWAY_THRES ||
 202         event->pos().x() < -MOUSE_AWAY_THRES;
 203         bool crossedVert =  event->pos().y() - height() > MOUSE_AWAY_THRES ||
 204         event->pos().y() < -MOUSE_AWAY_THRES;
 205
 206         bool removePoint = (crossedHoriz || crossedVert);
 207
 208         if (!removePoint && d->m_draggedAwayPointIndex >= 0) {
 209             // point is no longer dragged away so reinsert it
 210             QPointF newPoint(d->m_draggedAwayPoint);
 211             d->m_grab_point_index = d->m_curve.addPoint(newPoint);
 212             d->m_draggedAwayPointIndex = -1;
 213         }
 214
 215         if (removePoint &&
 216             (d->m_draggedAwayPointIndex >= 0))
 217             return;
 218         */
 219
 220         setCursor(Qt::CrossCursor);
 221
 222         x += m_grabOffsetX;
 223         y += m_grabOffsetY;
 224
 225         double leftX, rightX;
 226         BPoint point = m_spline.points()[m_currentPointIndex];
 227         switch (m_currentPointType) {
 228         case PTypeH1:
 229             rightX = point.p.x();
 230             if (m_currentPointIndex == 0)
 231                 leftX = -1000;
 232             else
 233                 leftX = m_spline.points()[m_currentPointIndex - 1].p.x();
 234             x = qBound(leftX, x, rightX);
 235             point.h1 = QPointF(x, y);
 236             break;
 237         case PTypeP:
 238             if (m_currentPointIndex == 0) {
 239                 leftX = 0.0;
 240                 rightX = 0.0;
 241                 /*if (d->m_curve.points().count() > 1)
 242                  *           rightX = d->m_curve.points()[d->m_grab_point_index + 1].x() - POINT_AREA;
 243                  *       else
 244                  *           rightX = 1.0;*/
 245             } else if (m_currentPointIndex == m_spline.points().count() - 1) {
 246                 leftX = 1.0;//m_spline.points()[m_currentPointIndex - 1].p.x();
 247                 rightX = 1.0;
 248             } else {
 249                 //// the 1E-4 addition so we can grab the dot later.
 250                 leftX = m_spline.points()[m_currentPointIndex - 1].p.x();// + POINT_AREA;
 251                 rightX = m_spline.points()[m_currentPointIndex + 1].p.x();// - POINT_AREA;
 252             }
 253             x = qBound(leftX, x, rightX);
 254             y = qBound(0., y, 1.);
 255             point.p = QPointF(x, y);
 256             break;
 257         case PTypeH2:
 258             leftX = point.p.x();
 259             if (m_currentPointIndex == m_spline.points().count() - 1)
 260                 rightX = 1001;
 261             else
 262                 rightX = m_spline.points()[m_currentPointIndex + 1].p.x();
 263             x = qBound(leftX, x, rightX);
 264             point.h2 = QPointF(x, y);
 265         };
 266
 267         m_spline.setPoint(m_currentPointIndex, point);
 268
 269         /*if (removePoint && d->m_curve.points().count() > 2) {
 270             d->m_draggedAwayPoint = d->m_curve.points()[d->m_grab_point_index];
 271             d->m_draggedAwayPointIndex = d->m_grab_point_index;
 272             d->m_curve.removePoint(d->m_grab_point_index);
 273             d->m_grab_point_index = bounds(d->m_grab_point_index, 0, d->m_curve.points().count() - 1);
 274         }
 275
 276         d->setCurveModified();*/
 277         update();
 278     }
 279 }
 280
 281 void BezierSplineWidget::leaveEvent(QEvent* event)
 282 {
 283     QWidget::leaveEvent(event);
 284 }
 285
 286 int BezierSplineWidget::nearestPointInRange(QPointF p, int wWidth, int wHeight, BezierSplineWidget::point_types* sel)
 287 {
 288     double nearestDistanceSquared = 1000;
 289     point_types selectedPoint;
 290     int nearestIndex = -1;
 291     int i = 0;
 292
 293     double distanceSquared;
 294     foreach(const BPoint & point, m_spline.points()) {
 295         distanceSquared = pow(point.h1.x() - p.x(), 2) + pow(point.h1.y() - p.y(), 2);
 296         if (distanceSquared < nearestDistanceSquared) {
 297             nearestIndex = i;
 298             nearestDistanceSquared = distanceSquared;
 299             selectedPoint = PTypeH1;
 300         }
 301         distanceSquared = pow(point.p.x() - p.x(), 2) + pow(point.p.y() - p.y(), 2);
 302         if (distanceSquared < nearestDistanceSquared) {
 303             nearestIndex = i;
 304             nearestDistanceSquared = distanceSquared;
 305             selectedPoint = PTypeP;
 306         }
 307         distanceSquared = pow(point.h2.x() - p.x(), 2) + pow(point.h2.y() - p.y(), 2);
 308         if (distanceSquared < nearestDistanceSquared) {
 309             nearestIndex = i;
 310             nearestDistanceSquared = distanceSquared;
 311             selectedPoint = PTypeH2;
 312         }
 313         ++i;
 314     }
 315
 316     if (nearestIndex >= 0) {
 317         BPoint point = m_spline.points()[nearestIndex];
 318         QPointF p2;
 319         switch (selectedPoint) {
 320         case PTypeH1:
 321             p2 = point.h1;
 322             break;
 323         case PTypeP:
 324             p2 = point.p;
 325             break;
 326         case PTypeH2:
 327             p2 = point.h2;
 328         }
 329         if (qAbs(p.x() - p2.x()) * (wWidth - 1) < 5 && qAbs(p.y() - p2.y()) * (wHeight - 1) < 5) {
 330             *sel = selectedPoint;
 331             return nearestIndex;
 332         }
 333     }
 334
 335     return -1;
 336 }
 337
 338 #include "beziersplinewidget.moc"