git.sesse.net Git - kdenlive/blob - src/kis_curve_widget.cpp

   1 /*
   2  *  Copyright (c) 2005 Casper Boemann <cbr@boemann.dk>
   3  *  Copyright (c) 2009 Dmitry Kazakov <dimula73@gmail.com>
   4  *
   5  *  This program 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  *  This program 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 this program; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20
  21 // C++ includes.
  22
  23 #include <cmath>
  24 #include <cstdlib>
  25
  26 // Qt includes.
  27
  28 #include <QPixmap>
  29 #include <QPainter>
  30 #include <QPoint>
  31 #include <QPen>
  32 #include <QEvent>
  33 #include <QRect>
  34 #include <QFont>
  35 #include <QFontMetrics>
  36 #include <QMouseEvent>
  37 #include <QKeyEvent>
  38 #include <QPaintEvent>
  39 #include <QList>
  40
  41 #include <QSpinBox>
  42
  43 // KDE includes.
  44
  45 #include <kcursor.h>
  46 #include <klocale.h>
  47
  48 // Local includes.
  49
  50 #include "kis_curve_widget.h"
  51
  52
  53 #define bounds(x,a,b) (x<a ? a : (x>b ? b :x))
  54 #define MOUSE_AWAY_THRES 15
  55 #define POINT_AREA       1E-4
  56 #define CURVE_AREA       1E-4
  57
  58 #include "kis_curve_widget_p.h"
  59
  60
  61 //static bool pointLessThan(const QPointF &a, const QPointF &b);
  62
  63
  64 KisCurveWidget::KisCurveWidget(QWidget *parent, Qt::WFlags f)
  65         : QWidget(parent, f), d(new KisCurveWidget::Private(this))
  66 {
  67     setObjectName("KisCurveWidget");
  68     d->m_grab_point_index = -1;
  69     d->m_readOnlyMode   = false;
  70     d->m_guideVisible   = false;
  71     d->m_pixmapDirty = true;
  72     d->m_pixmapCache = NULL;
  73     d->setState(ST_NORMAL);
  74
  75     d->m_intIn = NULL;
  76     d->m_intOut = NULL;
  77
  78     d->m_maxPoints = -1;
  79
  80     setMouseTracking(true);
  81     setAutoFillBackground(false);
  82     setAttribute(Qt::WA_OpaquePaintEvent);
  83     setMinimumSize(150, 150);
  84     setMaximumSize(350, 350);
  85
  86     d->setCurveModified();
  87
  88     setFocusPolicy(Qt::StrongFocus);
  89 }
  90
  91 KisCurveWidget::~KisCurveWidget()
  92 {
  93     if (d->m_pixmapCache)
  94         delete d->m_pixmapCache;
  95     delete d;
  96 }
  97
  98 void KisCurveWidget::setupInOutControls(QSpinBox *in, QSpinBox *out, int min, int max)
  99 {
 100     d->m_intIn = in;
 101     d->m_intOut = out;
 102
 103     if (!d->m_intIn || !d->m_intOut)
 104         return;
 105
 106     d->m_inOutMin = min;
 107     d->m_inOutMax = max;
 108
 109     d->m_intIn->setRange(d->m_inOutMin, d->m_inOutMax);
 110     d->m_intOut->setRange(d->m_inOutMin, d->m_inOutMax);
 111
 112
 113     connect(d->m_intIn, SIGNAL(valueChanged(int)), this, SLOT(inOutChanged(int)));
 114     connect(d->m_intOut, SIGNAL(valueChanged(int)), this, SLOT(inOutChanged(int)));
 115     d->syncIOControls();
 116
 117 }
 118 void KisCurveWidget::dropInOutControls()
 119 {
 120     if (!d->m_intIn || !d->m_intOut)
 121         return;
 122
 123     disconnect(d->m_intIn, SIGNAL(valueChanged(int)), this, SLOT(inOutChanged(int)));
 124     disconnect(d->m_intOut, SIGNAL(valueChanged(int)), this, SLOT(inOutChanged(int)));
 125
 126     d->m_intIn = d->m_intOut = NULL;
 127
 128 }
 129
 130 void KisCurveWidget::inOutChanged(int)
 131 {
 132     QPointF pt;
 133
 134     Q_ASSERT(d->m_grab_point_index >= 0);
 135
 136     pt.setX(d->io2sp(d->m_intIn->value()));
 137     pt.setY(d->io2sp(d->m_intOut->value()));
 138
 139     if (d->jumpOverExistingPoints(pt, d->m_grab_point_index)) {
 140         d->m_curve.setPoint(d->m_grab_point_index, pt);
 141         d->m_grab_point_index = d->m_curve.points().indexOf(pt);
 142     } else
 143         pt = d->m_curve.points()[d->m_grab_point_index];
 144
 145
 146     d->m_intIn->blockSignals(true);
 147     d->m_intOut->blockSignals(true);
 148
 149     d->m_intIn->setValue(d->sp2io(pt.x()));
 150     d->m_intOut->setValue(d->sp2io(pt.y()));
 151
 152     d->m_intIn->blockSignals(false);
 153     d->m_intOut->blockSignals(false);
 154
 155     d->setCurveModified();
 156 }
 157
 158
 159 void KisCurveWidget::reset(void)
 160 {
 161     d->m_grab_point_index = -1;
 162     d->m_guideVisible = false;
 163
 164     d->setCurveModified();
 165 }
 166
 167 void KisCurveWidget::setCurveGuide(const QColor & color)
 168 {
 169     d->m_guideVisible = true;
 170     d->m_colorGuide   = color;
 171 }
 172
 173 void KisCurveWidget::setPixmap(const QPixmap & pix)
 174 {
 175     d->m_pix = pix;
 176     d->m_pixmapDirty = true;
 177     d->setCurveRepaint();
 178 }
 179
 180 void KisCurveWidget::keyPressEvent(QKeyEvent *e)
 181 {
 182     if (e->key() == Qt::Key_Delete || e->key() == Qt::Key_Backspace) {
 183         if (d->m_grab_point_index > 0 && d->m_grab_point_index < d->m_curve.points().count() - 1) {
 184             //x() find closest point to get focus afterwards
 185             double grab_point_x = d->m_curve.points()[d->m_grab_point_index].x();
 186
 187             int left_of_grab_point_index = d->m_grab_point_index - 1;
 188             int right_of_grab_point_index = d->m_grab_point_index + 1;
 189             int new_grab_point_index;
 190
 191             if (fabs(d->m_curve.points()[left_of_grab_point_index].x() - grab_point_x) <
 192                     fabs(d->m_curve.points()[right_of_grab_point_index].x() - grab_point_x)) {
 193                 new_grab_point_index = left_of_grab_point_index;
 194             } else {
 195                 new_grab_point_index = d->m_grab_point_index;
 196             }
 197             d->m_curve.removePoint(d->m_grab_point_index);
 198             d->m_grab_point_index = new_grab_point_index;
 199             setCursor(Qt::ArrowCursor);
 200             d->setState(ST_NORMAL);
 201         }
 202         d->setCurveModified();
 203     } else if (e->key() == Qt::Key_Escape && d->state() != ST_NORMAL) {
 204         d->m_curve.setPoint(d->m_grab_point_index, QPointF(d->m_grabOriginalX, d->m_grabOriginalY));
 205         setCursor(Qt::ArrowCursor);
 206         d->setState(ST_NORMAL);
 207
 208         d->setCurveModified();
 209     } else if ((e->key() == Qt::Key_A || e->key() == Qt::Key_Insert) && d->state() == ST_NORMAL) {
 210         /* FIXME: Lets user choose the hotkeys */
 211         addPointInTheMiddle();
 212     } else
 213         QWidget::keyPressEvent(e);
 214 }
 215
 216 void KisCurveWidget::addPointInTheMiddle()
 217 {
 218     QPointF pt(0.5, d->m_curve.value(0.5));
 219
 220     if (!d->jumpOverExistingPoints(pt, -1))
 221         return;
 222
 223     d->m_grab_point_index = d->m_curve.addPoint(pt);
 224
 225     if (d->m_intIn)
 226         d->m_intIn->setFocus(Qt::TabFocusReason);
 227     d->setCurveModified();
 228 }
 229
 230 void KisCurveWidget::resizeEvent(QResizeEvent *e)
 231 {
 232     d->m_pixmapDirty = true;
 233     QWidget::resizeEvent(e);
 234 }
 235
 236 void KisCurveWidget::paintEvent(QPaintEvent *)
 237 {
 238     int    wWidth = width() - 1;
 239     int    wHeight = height() - 1;
 240
 241     QPainter p(this);
 242
 243     // Antialiasing is not a good idea here, because
 244     // the grid will drift one pixel to any side due to rounding of int
 245     // FIXME: let's user tell the last word (in config)
 246     //p.setRenderHint(QPainter::Antialiasing);
 247
 248
 249     //  draw background
 250     if (!d->m_pix.isNull()) {
 251         if (d->m_pixmapDirty || !d->m_pixmapCache) {
 252             if (d->m_pixmapCache)
 253                 delete d->m_pixmapCache;
 254             d->m_pixmapCache = new QPixmap(width(), height());
 255             QPainter cachePainter(d->m_pixmapCache);
 256
 257             cachePainter.scale(1.0*width() / d->m_pix.width(), 1.0*height() / d->m_pix.height());
 258             cachePainter.drawPixmap(0, 0, d->m_pix);
 259             d->m_pixmapDirty = false;
 260         }
 261         p.drawPixmap(0, 0, *d->m_pixmapCache);
 262     } else
 263         p.fillRect(rect(), palette().background());
 264
 265
 266     d->drawGrid(p, wWidth, wHeight);
 267
 268     /*KisConfig cfg;
 269     if (cfg.antialiasCurves())
 270         p.setRenderHint(QPainter::Antialiasing);*/
 271
 272     // Draw default line
 273     p.setPen(QPen(Qt::gray, 1, Qt::SolidLine));
 274     p.drawLine(QLineF(0, wHeight, wWidth, 0));
 275
 276     // Draw curve.
 277     double prevY = wHeight - d->m_curve.value(0.) * wHeight;
 278     double prevX = 0.;
 279     double curY;
 280     double normalizedX;
 281     int x;
 282
 283     p.setPen(QPen(Qt::black, 1, Qt::SolidLine));
 284     for (x = 0 ; x < wWidth ; x++) {
 285         normalizedX = double(x) / wWidth;
 286         curY = wHeight - d->m_curve.value(normalizedX) * wHeight;
 287
 288         /**
 289          * Keep in mind that QLineF rounds doubles
 290          * to ints mathematically, not just rounds down
 291          * like in C
 292          */
 293         p.drawLine(QLineF(prevX, prevY,
 294                           x, curY));
 295         prevX = x;
 296         prevY = curY;
 297     }
 298     p.drawLine(QLineF(prevX, prevY ,
 299                       x, wHeight - d->m_curve.value(1.0) * wHeight));
 300
 301     // Drawing curve handles.
 302     double curveX;
 303     double curveY;
 304     if (!d->m_readOnlyMode) {
 305         for (int i = 0; i < d->m_curve.points().count(); ++i) {
 306             curveX = d->m_curve.points().at(i).x();
 307             curveY = d->m_curve.points().at(i).y();
 308
 309             if (i == d->m_grab_point_index) {
 310                 p.setPen(QPen(Qt::red, 3, Qt::SolidLine));
 311                 p.drawEllipse(QRectF(curveX * wWidth - 2,
 312                                      wHeight - 2 - curveY * wHeight, 4, 4));
 313             } else {
 314                 p.setPen(QPen(Qt::red, 1, Qt::SolidLine));
 315                 p.drawEllipse(QRectF(curveX * wWidth - 3,
 316                                      wHeight - 3 - curveY * wHeight, 6, 6));
 317             }
 318         }
 319     }
 320 }
 321
 322 void KisCurveWidget::mousePressEvent(QMouseEvent * e)
 323 {
 324     if (d->m_readOnlyMode) return;
 325
 326     double x = e->pos().x() / (double)(width() - 1);
 327     double y = 1.0 - e->pos().y() / (double)(height() - 1);
 328
 329
 330
 331     int closest_point_index = d->nearestPointInRange(QPointF(x, y), width(), height());
 332
 333     if (e->button() == Qt::RightButton && closest_point_index > 0 && closest_point_index < d->m_curve.points().count() - 1) {
 334         d->m_curve.removePoint(closest_point_index);
 335         setCursor(Qt::ArrowCursor);
 336         d->setState(ST_NORMAL);
 337         if (closest_point_index < d->m_grab_point_index)
 338             --d->m_grab_point_index;
 339         d->setCurveModified();
 340         return;
 341     } else if (e->button() != Qt::LeftButton) return;
 342
 343     if (closest_point_index < 0) {
 344         if (d->m_maxPoints > 0 && d->m_curve.points().count() >= d->m_maxPoints)
 345             return;
 346         QPointF newPoint(x, y);
 347         if (!d->jumpOverExistingPoints(newPoint, -1))
 348             return;
 349         d->m_grab_point_index = d->m_curve.addPoint(newPoint);
 350     } else {
 351         d->m_grab_point_index = closest_point_index;
 352     }
 353
 354     d->m_grabOriginalX = d->m_curve.points()[d->m_grab_point_index].x();
 355     d->m_grabOriginalY = d->m_curve.points()[d->m_grab_point_index].y();
 356     d->m_grabOffsetX = d->m_curve.points()[d->m_grab_point_index].x() - x;
 357     d->m_grabOffsetY = d->m_curve.points()[d->m_grab_point_index].y() - y;
 358     d->m_curve.setPoint(d->m_grab_point_index, QPointF(x + d->m_grabOffsetX, y + d->m_grabOffsetY));
 359
 360     d->m_draggedAwayPointIndex = -1;
 361     d->setState(ST_DRAG);
 362
 363
 364     d->setCurveModified();
 365 }
 366
 367
 368 void KisCurveWidget::mouseReleaseEvent(QMouseEvent *e)
 369 {
 370     if (d->m_readOnlyMode) return;
 371
 372     if (e->button() != Qt::LeftButton)
 373         return;
 374
 375     setCursor(Qt::ArrowCursor);
 376     d->setState(ST_NORMAL);
 377
 378     d->setCurveModified();
 379 }
 380
 381
 382 void KisCurveWidget::mouseMoveEvent(QMouseEvent * e)
 383 {
 384     if (d->m_readOnlyMode) return;
 385
 386     double x = e->pos().x() / (double)(width() - 1);
 387     double y = 1.0 - e->pos().y() / (double)(height() - 1);
 388
 389     if (d->state() == ST_NORMAL) { // If no point is selected set the the cursor shape if on top
 390         int nearestPointIndex = d->nearestPointInRange(QPointF(x, y), width(), height());
 391
 392         if (nearestPointIndex < 0)
 393             setCursor(Qt::ArrowCursor);
 394         else
 395             setCursor(Qt::CrossCursor);
 396     } else { // Else, drag the selected point
 397         bool crossedHoriz = e->pos().x() - width() > MOUSE_AWAY_THRES ||
 398                             e->pos().x() < -MOUSE_AWAY_THRES;
 399         bool crossedVert =  e->pos().y() - height() > MOUSE_AWAY_THRES ||
 400                             e->pos().y() < -MOUSE_AWAY_THRES;
 401
 402         bool removePoint = (crossedHoriz || crossedVert);
 403
 404         if (!removePoint && d->m_draggedAwayPointIndex >= 0) {
 405             // point is no longer dragged away so reinsert it
 406             QPointF newPoint(d->m_draggedAwayPoint);
 407             d->m_grab_point_index = d->m_curve.addPoint(newPoint);
 408             d->m_draggedAwayPointIndex = -1;
 409         }
 410
 411         if (removePoint &&
 412                 (d->m_draggedAwayPointIndex >= 0))
 413             return;
 414
 415
 416         setCursor(Qt::CrossCursor);
 417
 418         x += d->m_grabOffsetX;
 419         y += d->m_grabOffsetY;
 420
 421         double leftX;
 422         double rightX;
 423         if (d->m_grab_point_index == 0) {
 424             leftX = 0.0;
 425             if (d->m_curve.points().count() > 1)
 426                 rightX = d->m_curve.points()[d->m_grab_point_index + 1].x() - POINT_AREA;
 427             else
 428                 rightX = 1.0;
 429         } else if (d->m_grab_point_index == d->m_curve.points().count() - 1) {
 430             leftX = d->m_curve.points()[d->m_grab_point_index - 1].x() + POINT_AREA;
 431             rightX = 1.0;
 432         } else {
 433             Q_ASSERT(d->m_grab_point_index > 0 && d->m_grab_point_index < d->m_curve.points().count() - 1);
 434
 435             // the 1E-4 addition so we can grab the dot later.
 436             leftX = d->m_curve.points()[d->m_grab_point_index - 1].x() + POINT_AREA;
 437             rightX = d->m_curve.points()[d->m_grab_point_index + 1].x() - POINT_AREA;
 438         }
 439
 440         x = bounds(x, leftX, rightX);
 441         y = bounds(y, 0., 1.);
 442
 443         d->m_curve.setPoint(d->m_grab_point_index, QPointF(x, y));
 444
 445         if (removePoint && d->m_curve.points().count() > 2) {
 446             d->m_draggedAwayPoint = d->m_curve.points()[d->m_grab_point_index];
 447             d->m_draggedAwayPointIndex = d->m_grab_point_index;
 448             d->m_curve.removePoint(d->m_grab_point_index);
 449             d->m_grab_point_index = bounds(d->m_grab_point_index, 0, d->m_curve.points().count() - 1);
 450         }
 451
 452         d->setCurveModified();
 453     }
 454 }
 455
 456 KisCubicCurve KisCurveWidget::curve()
 457 {
 458     return d->m_curve;
 459 }
 460
 461 void KisCurveWidget::setCurve(KisCubicCurve inlist)
 462 {
 463     d->m_curve = inlist;
 464     d->m_grab_point_index = qBound(0, d->m_grab_point_index, d->m_curve.points().count() - 1);
 465     d->setCurveModified();
 466 }
 467
 468 void KisCurveWidget::leaveEvent(QEvent *)
 469 {
 470 }
 471
 472 void KisCurveWidget::setMaxPoints(int max)
 473 {
 474     d->m_maxPoints = max;
 475 }
 476
 477 #include "kis_curve_widget.moc"