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
 174 void KisCurveWidget::setPixmap(const QPixmap & pix)
 175 {
 176     d->m_pix = pix;
 177     d->m_pixmapDirty = true;
 178     d->setCurveRepaint();
 179 }
 180
 181 void KisCurveWidget::keyPressEvent(QKeyEvent *e)
 182 {
 183     if (e->key() == Qt::Key_Delete || e->key() == Qt::Key_Backspace) {
 184         if (d->m_grab_point_index > 0 && d->m_grab_point_index < d->m_curve.points().count() - 1) {
 185             //x() find closest point to get focus afterwards
 186             double grab_point_x = d->m_curve.points()[d->m_grab_point_index].x();
 187
 188             int left_of_grab_point_index = d->m_grab_point_index - 1;
 189             int right_of_grab_point_index = d->m_grab_point_index + 1;
 190             int new_grab_point_index;
 191
 192             if (fabs(d->m_curve.points()[left_of_grab_point_index].x() - grab_point_x) <
 193                     fabs(d->m_curve.points()[right_of_grab_point_index].x() - grab_point_x)) {
 194                 new_grab_point_index = left_of_grab_point_index;
 195             } else {
 196                 new_grab_point_index = d->m_grab_point_index;
 197             }
 198             d->m_curve.removePoint(d->m_grab_point_index);
 199             d->m_grab_point_index = new_grab_point_index;
 200             setCursor(Qt::ArrowCursor);
 201             d->setState(ST_NORMAL);
 202         }
 203         d->setCurveModified();
 204     } else if (e->key() == Qt::Key_Escape && d->state() != ST_NORMAL) {
 205         d->m_curve.setPoint(d->m_grab_point_index, QPointF(d->m_grabOriginalX, d->m_grabOriginalY) );
 206         setCursor(Qt::ArrowCursor);
 207         d->setState(ST_NORMAL);
 208
 209         d->setCurveModified();
 210     } else if ((e->key() == Qt::Key_A || e->key() == Qt::Key_Insert) && d->state() == ST_NORMAL) {
 211         /* FIXME: Lets user choose the hotkeys */
 212         addPointInTheMiddle();
 213     } else
 214         QWidget::keyPressEvent(e);
 215 }
 216
 217 void KisCurveWidget::addPointInTheMiddle()
 218 {
 219     QPointF pt(0.5, d->m_curve.value(0.5));
 220
 221     if (!d->jumpOverExistingPoints(pt, -1))
 222         return;
 223
 224     d->m_grab_point_index = d->m_curve.addPoint(pt);
 225
 226     if (d->m_intIn)
 227         d->m_intIn->setFocus(Qt::TabFocusReason);
 228     d->setCurveModified();
 229 }
 230
 231 void KisCurveWidget::resizeEvent(QResizeEvent *e)
 232 {
 233     d->m_pixmapDirty = true;
 234     QWidget::resizeEvent(e);
 235 }
 236
 237 void KisCurveWidget::paintEvent(QPaintEvent *)
 238 {
 239     int    wWidth = width() - 1;
 240     int    wHeight = height() - 1;
 241
 242     QPainter p(this);
 243
 244     // Antialiasing is not a good idea here, because
 245     // the grid will drift one pixel to any side due to rounding of int
 246     // FIXME: let's user tell the last word (in config)
 247     //p.setRenderHint(QPainter::Antialiasing);
 248
 249
 250     //  draw background
 251     if (!d->m_pix.isNull()) {
 252         if (d->m_pixmapDirty || !d->m_pixmapCache) {
 253             if (d->m_pixmapCache)
 254                 delete d->m_pixmapCache;
 255             d->m_pixmapCache = new QPixmap(width(), height());
 256             QPainter cachePainter(d->m_pixmapCache);
 257
 258             cachePainter.scale(1.0*width() / d->m_pix.width(), 1.0*height() / d->m_pix.height());
 259             cachePainter.drawPixmap(0, 0, d->m_pix);
 260             d->m_pixmapDirty = false;
 261         }
 262         p.drawPixmap(0, 0, *d->m_pixmapCache);
 263     } else
 264         p.fillRect(rect(), palette().background());
 265
 266
 267     d->drawGrid(p, wWidth, wHeight);
 268
 269     /*KisConfig cfg;
 270     if (cfg.antialiasCurves())
 271         p.setRenderHint(QPainter::Antialiasing);*/
 272
 273     // Draw curve.
 274     double prevY = wHeight - d->m_curve.value(0.) * wHeight;
 275     double prevX = 0.;
 276     double curY;
 277     double normalizedX;
 278     int x;
 279
 280     p.setPen(QPen(Qt::black, 1, Qt::SolidLine));
 281     for (x = 0 ; x < wWidth ; x++) {
 282         normalizedX = double(x) / wWidth;
 283         curY = wHeight - d->m_curve.value(normalizedX) * wHeight;
 284
 285         /**
 286          * Keep in mind that QLineF rounds doubles
 287          * to ints mathematically, not just rounds down
 288          * like in C
 289          */
 290         p.drawLine(QLineF(prevX, prevY,
 291                           x, curY));
 292         prevX = x;
 293         prevY = curY;
 294     }
 295     p.drawLine(QLineF(prevX, prevY ,
 296                       x, wHeight - d->m_curve.value(1.0) * wHeight));
 297
 298     // Drawing curve handles.
 299     double curveX;
 300     double curveY;
 301     if (!d->m_readOnlyMode) {
 302         for (int i = 0; i < d->m_curve.points().count(); ++i) {
 303             curveX = d->m_curve.points().at(i).x();
 304             curveY = d->m_curve.points().at(i).y();
 305
 306             if (i == d->m_grab_point_index) {
 307                 p.setPen(QPen(Qt::red, 3, Qt::SolidLine));
 308                 p.drawEllipse(QRectF(curveX * wWidth - 2,
 309                                      wHeight - 2 - curveY * wHeight, 4, 4));
 310             } else {
 311                 p.setPen(QPen(Qt::red, 1, Qt::SolidLine));
 312                 p.drawEllipse(QRectF(curveX * wWidth - 3,
 313                                      wHeight - 3 - curveY * wHeight, 6, 6));
 314             }
 315         }
 316     }
 317 }
 318
 319 void KisCurveWidget::mousePressEvent(QMouseEvent * e)
 320 {
 321     if (d->m_readOnlyMode) return;
 322
 323     double x = e->pos().x() / (double)(width() - 1);
 324     double y = 1.0 - e->pos().y() / (double)(height() - 1);
 325
 326
 327
 328     int closest_point_index = d->nearestPointInRange(QPointF(x, y), width(), height());
 329
 330     if (e->button() == Qt::RightButton && closest_point_index > 0 && closest_point_index < d->m_curve.points().count() - 1) {
 331         d->m_curve.removePoint(closest_point_index);
 332         setCursor(Qt::ArrowCursor);
 333         d->setState(ST_NORMAL);
 334         if (closest_point_index < d->m_grab_point_index)
 335             --d->m_grab_point_index;
 336         d->setCurveModified();
 337         return;
 338     } else if (e->button() != Qt::LeftButton) return;
 339
 340     if (closest_point_index < 0) {
 341         if (d->m_maxPoints > 0 && d->m_curve.points().count() >= d->m_maxPoints)
 342             return;
 343         QPointF newPoint(x, y);
 344         if (!d->jumpOverExistingPoints(newPoint, -1))
 345             return;
 346         d->m_grab_point_index = d->m_curve.addPoint(newPoint);
 347     } else {
 348         d->m_grab_point_index = closest_point_index;
 349     }
 350
 351     d->m_grabOriginalX = d->m_curve.points()[d->m_grab_point_index].x();
 352     d->m_grabOriginalY = d->m_curve.points()[d->m_grab_point_index].y();
 353     d->m_grabOffsetX = d->m_curve.points()[d->m_grab_point_index].x() - x;
 354     d->m_grabOffsetY = d->m_curve.points()[d->m_grab_point_index].y() - y;
 355     d->m_curve.setPoint(d->m_grab_point_index, QPointF(x + d->m_grabOffsetX, y + d->m_grabOffsetY));
 356
 357     d->m_draggedAwayPointIndex = -1;
 358     d->setState(ST_DRAG);
 359
 360
 361     d->setCurveModified();
 362 }
 363
 364
 365 void KisCurveWidget::mouseReleaseEvent(QMouseEvent *e)
 366 {
 367     if (d->m_readOnlyMode) return;
 368
 369     if (e->button() != Qt::LeftButton)
 370         return;
 371
 372     setCursor(Qt::ArrowCursor);
 373     d->setState(ST_NORMAL);
 374
 375     d->setCurveModified();
 376 }
 377
 378
 379 void KisCurveWidget::mouseMoveEvent(QMouseEvent * e)
 380 {
 381     if (d->m_readOnlyMode) return;
 382
 383     double x = e->pos().x() / (double)(width() - 1);
 384     double y = 1.0 - e->pos().y() / (double)(height() - 1);
 385
 386     if (d->state() == ST_NORMAL) { // If no point is selected set the the cursor shape if on top
 387         int nearestPointIndex = d->nearestPointInRange(QPointF(x, y), width(), height());
 388
 389         if (nearestPointIndex < 0)
 390             setCursor(Qt::ArrowCursor);
 391         else
 392             setCursor(Qt::CrossCursor);
 393     } else { // Else, drag the selected point
 394         bool crossedHoriz = e->pos().x() - width() > MOUSE_AWAY_THRES ||
 395                             e->pos().x() < -MOUSE_AWAY_THRES;
 396         bool crossedVert =  e->pos().y() - height() > MOUSE_AWAY_THRES ||
 397                             e->pos().y() < -MOUSE_AWAY_THRES;
 398
 399         bool removePoint = (crossedHoriz || crossedVert);
 400
 401         if (!removePoint && d->m_draggedAwayPointIndex >= 0) {
 402             // point is no longer dragged away so reinsert it
 403             QPointF newPoint(d->m_draggedAwayPoint);
 404             d->m_grab_point_index = d->m_curve.addPoint(newPoint);
 405             d->m_draggedAwayPointIndex = -1;
 406         }
 407
 408         if (removePoint &&
 409                 (d->m_draggedAwayPointIndex >= 0))
 410             return;
 411
 412
 413         setCursor(Qt::CrossCursor);
 414
 415         x += d->m_grabOffsetX;
 416         y += d->m_grabOffsetY;
 417
 418         double leftX;
 419         double rightX;
 420         if (d->m_grab_point_index == 0) {
 421             leftX = 0.0;
 422             if (d->m_curve.points().count() > 1)
 423                 rightX = d->m_curve.points()[d->m_grab_point_index + 1].x() - POINT_AREA;
 424             else
 425                 rightX = 1.0;
 426         } else if (d->m_grab_point_index == d->m_curve.points().count() - 1) {
 427             leftX = d->m_curve.points()[d->m_grab_point_index - 1].x() + POINT_AREA;
 428             rightX = 1.0;
 429         } else {
 430             Q_ASSERT(d->m_grab_point_index > 0 && d->m_grab_point_index < d->m_curve.points().count() - 1);
 431
 432             // the 1E-4 addition so we can grab the dot later.
 433             leftX = d->m_curve.points()[d->m_grab_point_index - 1].x() + POINT_AREA;
 434             rightX = d->m_curve.points()[d->m_grab_point_index + 1].x() - POINT_AREA;
 435         }
 436
 437         x = bounds(x, leftX, rightX);
 438         y = bounds(y, 0., 1.);
 439
 440         d->m_curve.setPoint(d->m_grab_point_index, QPointF(x, y));
 441
 442         if (removePoint && d->m_curve.points().count() > 2) {
 443             d->m_draggedAwayPoint = d->m_curve.points()[d->m_grab_point_index];
 444             d->m_draggedAwayPointIndex = d->m_grab_point_index;
 445             d->m_curve.removePoint(d->m_grab_point_index);
 446             d->m_grab_point_index = bounds(d->m_grab_point_index, 0, d->m_curve.points().count() - 1);
 447         }
 448
 449         d->setCurveModified();
 450     }
 451 }
 452
 453 KisCubicCurve KisCurveWidget::curve()
 454 {
 455     return d->m_curve;
 456 }
 457
 458 void KisCurveWidget::setCurve(KisCubicCurve inlist)
 459 {
 460     d->m_curve = inlist;
 461     d->m_grab_point_index = qBound(0, d->m_grab_point_index, d->m_curve.points().count() - 1);
 462     d->setCurveModified();
 463 }
 464
 465 void KisCurveWidget::leaveEvent(QEvent *)
 466 {
 467 }
 468
 469 void KisCurveWidget::setMaxPoints(int max)
 470 {
 471     d->m_maxPoints = max;
 472 }
 473
 474 #include "kis_curve_widget.moc"