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