summaryrefslogtreecommitdiffstats
path: root/src/widgets/graphicsview/qgraphicsitemanimation.cpp
blob: bb90337c5e7a10a2cb62a33cc900d348e87f3061 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

/*!
    \class QGraphicsItemAnimation
    \brief The QGraphicsItemAnimation class provides simple animation
    support for QGraphicsItem.
    \since 4.2
    \ingroup graphicsview-api
    \inmodule QtWidgets
    \deprecated

    The QGraphicsItemAnimation class animates a QGraphicsItem. You can
    schedule changes to the item's transformation matrix at
    specified steps. The QGraphicsItemAnimation class has a
    current step value. When this value changes the transformations
    scheduled at that step are performed. The current step of the
    animation is set with the \c setStep() function.

    QGraphicsItemAnimation will do a simple linear interpolation
    between the nearest adjacent scheduled changes to calculate the
    matrix. For instance, if you set the position of an item at values
    0.0 and 1.0, the animation will show the item moving in a straight
    line between these positions. The same is true for scaling and
    rotation.

    It is usual to use the class with a QTimeLine. The timeline's
    \l{QTimeLine::}{valueChanged()} signal is then connected to the
    \c setStep() slot. For example, you can set up an item for rotation
    by calling \c setRotationAt() for different step values.
    The animations timeline is set with the setTimeLine() function.

    An example animation with a timeline follows:

    \snippet timeline/main.cpp 0

    Note that steps lie between 0.0 and 1.0. It may be necessary to use
    \l{QTimeLine::}{setUpdateInterval()}. The default update interval
    is 40 ms. A scheduled transformation cannot be removed when set,
    so scheduling several transformations of the same kind (e.g.,
    rotations) at the same step is not recommended.

    \sa QTimeLine, {Graphics View Framework}
*/

#include "qgraphicsitemanimation.h"

#ifndef QT_NO_GRAPHICSVIEW

#include "qgraphicsitem.h"

#include <QtCore/qtimeline.h>
#include <QtCore/qpoint.h>
#include <QtCore/qpointer.h>
#include <QtCore/qpair.h>
#include <QtGui/qmatrix.h>

QT_BEGIN_NAMESPACE

class QGraphicsItemAnimationPrivate
{
public:
    inline QGraphicsItemAnimationPrivate()
        : q(0), timeLine(0), item(0), step(0)
    { }

    QGraphicsItemAnimation *q;

    QPointer<QTimeLine> timeLine;
    QGraphicsItem *item;

    QPointF startPos;
    QMatrix startMatrix;

    qreal step;

    struct Pair {
        Pair(qreal a, qreal b) : step(a), value(b) {}
        bool operator <(const Pair &other) const
        { return step < other.step; }
        bool operator==(const Pair &other) const
        { return step == other.step; }
        qreal step;
        qreal value;
    };
    QList<Pair> xPosition;
    QList<Pair> yPosition;
    QList<Pair> rotation;
    QList<Pair> verticalScale;
    QList<Pair> horizontalScale;
    QList<Pair> verticalShear;
    QList<Pair> horizontalShear;
    QList<Pair> xTranslation;
    QList<Pair> yTranslation;

    qreal linearValueForStep(qreal step, QList<Pair> *source, qreal defaultValue = 0);
    void insertUniquePair(qreal step, qreal value, QList<Pair> *binList, const char* method);
};

qreal QGraphicsItemAnimationPrivate::linearValueForStep(qreal step, QList<Pair> *source, qreal defaultValue)
{
    if (source->isEmpty())
        return defaultValue;
    step = qMin<qreal>(qMax<qreal>(step, 0), 1);

    if (step == 1)
        return source->last().value;

    qreal stepBefore = 0;
    qreal stepAfter = 1;
    qreal valueBefore = source->first().step == 0 ? source->first().value : defaultValue;
    qreal valueAfter = source->last().value;

    // Find the closest step and value before the given step.
    for (int i = 0; i < source->size() && step >= source->at(i).step; ++i) {
        stepBefore = source->at(i).step;
        valueBefore = source->at(i).value;
    }

    // Find the closest step and value after the given step.
    for (int j = source->size() - 1; j >= 0 && step < source->at(j).step; --j) {
        stepAfter = source->at(j).step;
        valueAfter = source->at(j).value;
    }

    // Do a simple linear interpolation.
    return valueBefore + (valueAfter - valueBefore) * ((step - stepBefore) / (stepAfter - stepBefore));
}

void QGraphicsItemAnimationPrivate::insertUniquePair(qreal step, qreal value, QList<Pair> *binList, const char* method)
{
    if (step < 0.0 || step > 1.0) {
        qWarning("QGraphicsItemAnimation::%s: invalid step = %f", method, step);
        return;
    }

    Pair pair(step, value);

    QList<Pair>::iterator result = qBinaryFind(binList->begin(), binList->end(), pair);
    if (result != binList->end())
        result->value = value;
    else {
        *binList << pair;
        qSort(binList->begin(), binList->end());
    }
}

/*!
  Constructs an animation object with the given \a parent.
*/
QGraphicsItemAnimation::QGraphicsItemAnimation(QObject *parent)
    : QObject(parent), d(new QGraphicsItemAnimationPrivate)
{
    d->q = this;
}

/*!
  Destroys the animation object.
*/
QGraphicsItemAnimation::~QGraphicsItemAnimation()
{
    delete d;
}

/*!
  Returns the item on which the animation object operates.

  \sa setItem()
*/
QGraphicsItem *QGraphicsItemAnimation::item() const
{
    return d->item;
}

/*!
  Sets the specified \a item to be used in the animation.

  \sa item()
*/
void QGraphicsItemAnimation::setItem(QGraphicsItem *item)
{
    d->item = item;
    d->startPos = d->item->pos();
}

/*!
  Returns the timeline object used to control the rate at which the animation
  occurs.

  \sa setTimeLine()
*/
QTimeLine *QGraphicsItemAnimation::timeLine() const
{
    return d->timeLine;
}

/*!
  Sets the timeline object used to control the rate of animation to the \a timeLine
  specified.

  \sa timeLine()
*/
void QGraphicsItemAnimation::setTimeLine(QTimeLine *timeLine)
{
    if (d->timeLine == timeLine)
        return;
    if (d->timeLine)
        delete d->timeLine;
    if (!timeLine)
        return;
    d->timeLine = timeLine;
    connect(timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(setStep(qreal)));
}

/*!
  Returns the position of the item at the given \a step value.

  \sa setPosAt()
*/
QPointF QGraphicsItemAnimation::posAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::posAt: invalid step = %f", step);

    return QPointF(d->linearValueForStep(step, &d->xPosition, d->startPos.x()),
                   d->linearValueForStep(step, &d->yPosition, d->startPos.y()));
}

/*!
  \fn void QGraphicsItemAnimation::setPosAt(qreal step, const QPointF &point)

  Sets the position of the item at the given \a step value to the \a point specified.

  \sa posAt()
*/
void QGraphicsItemAnimation::setPosAt(qreal step, const QPointF &pos)
{
    d->insertUniquePair(step, pos.x(), &d->xPosition, "setPosAt");
    d->insertUniquePair(step, pos.y(), &d->yPosition, "setPosAt");
}

/*!
  Returns all explicitly inserted positions.

  \sa posAt(), setPosAt()
*/
QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::posList() const
{
    QList<QPair<qreal, QPointF> > list;
    for (int i = 0; i < d->xPosition.size(); ++i)
        list << QPair<qreal, QPointF>(d->xPosition.at(i).step, QPointF(d->xPosition.at(i).value, d->yPosition.at(i).value));

    return list;
}

/*!
  Returns the matrix used to transform the item at the specified \a step value.
*/
QMatrix QGraphicsItemAnimation::matrixAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::matrixAt: invalid step = %f", step);

    QMatrix matrix;
    if (!d->rotation.isEmpty())
        matrix.rotate(rotationAt(step));
    if (!d->verticalScale.isEmpty())
        matrix.scale(horizontalScaleAt(step), verticalScaleAt(step));
    if (!d->verticalShear.isEmpty())
        matrix.shear(horizontalShearAt(step), verticalShearAt(step));
    if (!d->xTranslation.isEmpty())
        matrix.translate(xTranslationAt(step), yTranslationAt(step));
    return matrix;
}

/*!
  Returns the angle at which the item is rotated at the specified \a step value.

  \sa setRotationAt()
*/
qreal QGraphicsItemAnimation::rotationAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::rotationAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->rotation);
}

/*!
  Sets the rotation of the item at the given \a step value to the \a angle specified.

  \sa rotationAt()
*/
void QGraphicsItemAnimation::setRotationAt(qreal step, qreal angle)
{
    d->insertUniquePair(step, angle, &d->rotation, "setRotationAt");
}

/*!
  Returns all explicitly inserted rotations.

  \sa rotationAt(), setRotationAt()
*/
QList<QPair<qreal, qreal> > QGraphicsItemAnimation::rotationList() const
{
    QList<QPair<qreal, qreal> > list;
    for (int i = 0; i < d->rotation.size(); ++i)
        list << QPair<qreal, qreal>(d->rotation.at(i).step, d->rotation.at(i).value);

    return list;
}

/*!
  Returns the horizontal translation of the item at the specified \a step value.

  \sa setTranslationAt()
*/
qreal QGraphicsItemAnimation::xTranslationAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::xTranslationAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->xTranslation);
}

/*!
  Returns the vertical translation of the item at the specified \a step value.

  \sa setTranslationAt()
*/
qreal QGraphicsItemAnimation::yTranslationAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::yTranslationAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->yTranslation);
}

/*!
  Sets the translation of the item at the given \a step value using the horizontal
  and vertical coordinates specified by \a dx and \a dy.

  \sa xTranslationAt(), yTranslationAt()
*/
void QGraphicsItemAnimation::setTranslationAt(qreal step, qreal dx, qreal dy)
{
    d->insertUniquePair(step, dx, &d->xTranslation, "setTranslationAt");
    d->insertUniquePair(step, dy, &d->yTranslation, "setTranslationAt");
}

/*!
  Returns all explicitly inserted translations.

  \sa xTranslationAt(), yTranslationAt(), setTranslationAt()
*/
QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::translationList() const
{
    QList<QPair<qreal, QPointF> > list;
    for (int i = 0; i < d->xTranslation.size(); ++i)
        list << QPair<qreal, QPointF>(d->xTranslation.at(i).step, QPointF(d->xTranslation.at(i).value, d->yTranslation.at(i).value));

    return list;
}

/*!
  Returns the vertical scale for the item at the specified \a step value.

  \sa setScaleAt()
*/
qreal QGraphicsItemAnimation::verticalScaleAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::verticalScaleAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->verticalScale, 1);
}

/*!
  Returns the horizontal scale for the item at the specified \a step value.

  \sa setScaleAt()
*/
qreal QGraphicsItemAnimation::horizontalScaleAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::horizontalScaleAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->horizontalScale, 1);
}

/*!
  Sets the scale of the item at the given \a step value using the horizontal and
  vertical scale factors specified by \a sx and \a sy.

  \sa verticalScaleAt(), horizontalScaleAt()
*/
void QGraphicsItemAnimation::setScaleAt(qreal step, qreal sx, qreal sy)
{
    d->insertUniquePair(step, sx, &d->horizontalScale, "setScaleAt");
    d->insertUniquePair(step, sy, &d->verticalScale, "setScaleAt");
}

/*!
  Returns all explicitly inserted scales.

  \sa verticalScaleAt(), horizontalScaleAt(), setScaleAt()
*/
QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::scaleList() const
{
    QList<QPair<qreal, QPointF> > list;
    for (int i = 0; i < d->horizontalScale.size(); ++i)
        list << QPair<qreal, QPointF>(d->horizontalScale.at(i).step, QPointF(d->horizontalScale.at(i).value, d->verticalScale.at(i).value));

    return list;
}

/*!
  Returns the vertical shear for the item at the specified \a step value.

  \sa setShearAt()
*/
qreal QGraphicsItemAnimation::verticalShearAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::verticalShearAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->verticalShear, 0);
}

/*!
  Returns the horizontal shear for the item at the specified \a step value.

  \sa setShearAt()
*/
qreal QGraphicsItemAnimation::horizontalShearAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::horizontalShearAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->horizontalShear, 0);
}

/*!
  Sets the shear of the item at the given \a step value using the horizontal and
  vertical shear factors specified by \a sh and \a sv.

  \sa verticalShearAt(), horizontalShearAt()
*/
void QGraphicsItemAnimation::setShearAt(qreal step, qreal sh, qreal sv)
{
    d->insertUniquePair(step, sh, &d->horizontalShear, "setShearAt");
    d->insertUniquePair(step, sv, &d->verticalShear, "setShearAt");
}

/*!
  Returns all explicitly inserted shears.

  \sa verticalShearAt(), horizontalShearAt(), setShearAt()
*/
QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::shearList() const
{
    QList<QPair<qreal, QPointF> > list;
    for (int i = 0; i < d->horizontalShear.size(); ++i)
        list << QPair<qreal, QPointF>(d->horizontalShear.at(i).step, QPointF(d->horizontalShear.at(i).value, d->verticalShear.at(i).value));

    return list;
}

/*!
  Clears the scheduled transformations used for the animation, but
  retains the item and timeline.
*/
void QGraphicsItemAnimation::clear()
{
    d->xPosition.clear();
    d->yPosition.clear();
    d->rotation.clear();
    d->verticalScale.clear();
    d->horizontalScale.clear();
    d->verticalShear.clear();
    d->horizontalShear.clear();
    d->xTranslation.clear();
    d->yTranslation.clear();
}

/*!
  \fn void QGraphicsItemAnimation::setStep(qreal step)

  Sets the current \a step value for the animation, causing the
  transformations scheduled at this step to be performed.
*/
void QGraphicsItemAnimation::setStep(qreal x)
{
    if (x < 0.0 || x > 1.0) {
        qWarning("QGraphicsItemAnimation::setStep: invalid step = %f", x);
        return;
    }

    beforeAnimationStep(x);

    d->step = x;
    if (d->item) {
        if (!d->xPosition.isEmpty() || !d->yPosition.isEmpty())
            d->item->setPos(posAt(x));
        if (!d->rotation.isEmpty()
            || !d->verticalScale.isEmpty()
            || !d->horizontalScale.isEmpty()
            || !d->verticalShear.isEmpty()
            || !d->horizontalShear.isEmpty()
            || !d->xTranslation.isEmpty()
            || !d->yTranslation.isEmpty()) {
            d->item->setMatrix(d->startMatrix * matrixAt(x));
        }
    }

    afterAnimationStep(x);
}

/*!
    Resets the item to its starting position and transformation.

    \obsolete

    You can call setStep(0) instead.
*/
void QGraphicsItemAnimation::reset()
{
    if (!d->item)
        return;
    d->startPos = d->item->pos();
    d->startMatrix = d->item->matrix();
}

/*!
  \fn void QGraphicsItemAnimation::beforeAnimationStep(qreal step)

  This method is meant to be overridden by subclassed that needs to
  execute additional code before a new step takes place. The
  animation \a step is provided for use in cases where the action
  depends on its value.
*/
void QGraphicsItemAnimation::beforeAnimationStep(qreal step)
{
    Q_UNUSED(step);
}

/*!
  \fn void QGraphicsItemAnimation::afterAnimationStep(qreal step)

  This method is meant to be overridden in subclasses that need to
  execute additional code after a new step has taken place. The
  animation \a step is provided for use in cases where the action
  depends on its value.
*/
void QGraphicsItemAnimation::afterAnimationStep(qreal step)
{
    Q_UNUSED(step);
}

QT_END_NAMESPACE

#endif // QT_NO_GRAPHICSVIEW