下面的代码能够实现MAC的Genie效果，大家有空可以试一下，但是不知道怎么能使窗口也像这样扭曲，不知道Qt里能不能扭曲窗口，或者点击最小化窗口时，立即缩小窗口，但是留一张窗口的截图在窗口原来的地方，在扭曲这个图片，这样估计也能看到窗口被扭曲的假象，不知道能不能实现，一筹莫展呐。
效果图：
1 苹果电脑上的
2 我的Demo
- C/C++ code
#include <QtGui>#include <math.h>#define SLIDE_WIDTH 400#define SLIDE_HEIGHT 300#define SLIDE_SPACING 25#define ITEM_WIDTH 300#define ITEM_HEIGHT 30class GenieItem: public QGraphicsRectItem{public: GenieItem(): QGraphicsRectItem(), shape(0) { } ~GenieItem() { delete [] shape; } void setPixmap(const QPixmap &pm) { sourceImage = pm.toImage().convertToFormat(QImage::Format_ARGB32_Premultiplied); } // frame goes from 0..255 void animate(int frame) { effectImage.fill(0); int sw = sourceImage.width(); int sh = sourceImage.height(); int fh = effectImage.height(); int dp = qMin(255, 2 * frame); int y1 = (fh * frame) >> 8; int y2 = ((fh - sh) * dp) >> 8; int yr = y2 - y1 + sh; if (yr <= 0) return; int dy = (sh << 8) / yr; const quint32 *bits = reinterpret_cast<quint32*>(sourceImage.bits()); int words = sourceImage.bytesPerLine() / 4; quint32 *dest = reinterpret_cast<quint32*>(effectImage.scanLine(y1)); int stride = effectImage.bytesPerLine() / 4; int *ptr = shape + y1 * 2; int dx = 0; for (int sy = 0; yr; --yr, sy += dy, dest += stride) { const quint32 *src = bits + (sy >> 8) * words; int x1 = (*ptr++ * dp) >> 8; int x2 = (*ptr++ * dp) >> 8; quint32 *q = dest + x1; int xr = x2 - x1 + sw;#if 0 // enable this block to optimize the division to be carried out // approximately for every 8 rows only // this gives less perfect scaling if (!dx || !(yr & 7))#endif if(xr != 0) dx = (sw << 8) / xr; for (int sx = 0; xr; --xr, sx += dx) *q++ = src[sx >> 8]; } update(); } // prepare the tables which define the genie shape void setup() { int hh = (int)(rect().height()); int ww = (int)(rect().width()); effectImage = QImage(ww, hh, QImage::Format_ARGB32_Premultiplied); delete [] shape; shape = new int[hh*2]; qreal y1 = 1 - 1 / (1 + exp(-3.0)); qreal y2 = 1 - 1 / (1 + exp(3.0)); for (int i = 0; i < rect().height(); i++) { qreal x = (qreal)i * 6 / rect().height() - 3; qreal y = 1 - 1 / (1 + exp(x)); qreal ya = (y - y1) / (y2 - y1); shape[i * 2] = (int)(ya * effectImage.width()); shape[i * 2 + 1] = (int)(ya * (effectImage.width() - sourceImage.width())); } } void paint(QPainter *painter, const QStyleOptionGraphicsItem* option, QWidget*) { Q_UNUSED(option); painter->drawImage(0, 0, effectImage); }private: QImage sourceImage; QImage effectImage; int *shape;};class GenieDemo : public QGraphicsView{ Q_OBJECTpublic: GenieDemo();public slots: void slideLeft(); void slideRight(); void trash();protected: void keyPressEvent(QKeyEvent*);private slots: void moveSlides(int); void updateGenieEffect(int); void finishGenie();private: QGraphicsScene m_scene; QList<QGraphicsPixmapItem*> m_items; QTimeLine m_slidingTimeLine; int m_index; QPushButton *m_trashButton; GenieItem *m_genieItem; QTimeLine m_genieTimeLine;};GenieDemo::GenieDemo(): QGraphicsView(), m_index(0){ setScene(&m_scene); m_items += m_scene.addPixmap(QPixmap(":/bad.jpg")); m_items += m_scene.addPixmap(QPixmap(":/bad.jpg")); m_items += m_scene.addPixmap(QPixmap(":/bad.jpg")); m_items += m_scene.addPixmap(QPixmap(":/bad.jpg")); m_items += m_scene.addPixmap(QPixmap(":/bad.jpg")); m_items += m_scene.addPixmap(QPixmap(":/bad.jpg")); m_items += m_scene.addPixmap(QPixmap(":/bad.jpg")); m_items += m_scene.addPixmap(QPixmap(":/benedikte.jpg")); m_items += m_scene.addPixmap(QPixmap(":/castle.jpg")); m_items += m_scene.addPixmap(QPixmap(":/cookies.jpg")); m_items += m_scene.addPixmap(QPixmap(":/laptops.jpg")); m_items += m_scene.addPixmap(QPixmap(":/plasma.jpg")); m_items += m_scene.addPixmap(QPixmap(":/screenie.jpg")); m_items += m_scene.addPixmap(QPixmap(":/tagliatelle.jpg")); m_items += m_scene.addPixmap(QPixmap(":/try.jpg")); m_items += m_scene.addPixmap(QPixmap(":/bad.jpg")); for (int i = 0; i < m_items.count(); ++i) m_items[i]->setZValue(0); connect(&m_slidingTimeLine, SIGNAL(frameChanged(int)), this, SLOT(moveSlides(int))); m_slidingTimeLine.setCurveShape(QTimeLine::EaseInOutCurve); m_slidingTimeLine.setDuration(150); m_trashButton = new QPushButton; m_trashButton->setText("Delete"); m_scene.addWidget(m_trashButton); connect(m_trashButton, SIGNAL(clicked()), this, SLOT(trash())); m_genieItem = new GenieItem; m_genieItem->setZValue(1); m_scene.addItem(m_genieItem); m_genieItem->setVisible(false); connect(&m_genieTimeLine, SIGNAL(frameChanged(int)), this, SLOT(updateGenieEffect(int))); connect(&m_genieTimeLine, SIGNAL(finished()), this, SLOT(finishGenie())); m_genieTimeLine.setFrameRange(0, 255); m_genieTimeLine.setCurveShape(QTimeLine::EaseOutCurve); m_genieTimeLine.setDuration(800); setFixedSize(SLIDE_WIDTH * 2, SLIDE_HEIGHT + 200); setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); moveSlides(0);}void GenieDemo::keyPressEvent(QKeyEvent *event){ if (event->key() == Qt::Key_Left) { slideLeft(); event->accept(); return; } if (event->key() == Qt::Key_Right) { slideRight(); event->accept(); return; } if (event->key() == Qt::Key_Delete) { trash(); event->accept(); return; }}static int offsetFor(int index){ return -index * (SLIDE_WIDTH + SLIDE_SPACING);}void GenieDemo::slideLeft(){ if (m_slidingTimeLine.state() != QTimeLine::NotRunning) return; if (m_genieTimeLine.state() != QTimeLine::NotRunning) return; if (m_index >= m_items.count() - 1) return; m_slidingTimeLine.setFrameRange(offsetFor(m_index), offsetFor(m_index + 1)); m_slidingTimeLine.start(); m_index++;}void GenieDemo::slideRight(){ if (m_slidingTimeLine.state() != QTimeLine::NotRunning) return; if (m_genieTimeLine.state() != QTimeLine::NotRunning) return; if (m_index <= 0) return; m_slidingTimeLine.setFrameRange(offsetFor(m_index), offsetFor(m_index - 1)); m_slidingTimeLine.start(); m_index--;}void GenieDemo::moveSlides(int x){ int xofs = (width() - SLIDE_WIDTH - 2 * SLIDE_SPACING) / 2; for (int i = 0; i < m_items.count(); i++) m_items[i]->setPos(xofs + x - offsetFor(i), 0); m_trashButton->move(SLIDE_WIDTH * 3 / 2, SLIDE_HEIGHT + 100); int cx = m_trashButton->x() + m_trashButton->width() / 2; m_genieItem->setRect(0, 0, cx - xofs, m_trashButton->y()); m_genieItem->setPos(xofs, 0);}void GenieDemo::trash(){ if (m_items.count() <= 1) return; if (m_slidingTimeLine.state() != QTimeLine::NotRunning) return; if (m_genieTimeLine.state() != QTimeLine::NotRunning) return; m_items[m_index]->setVisible(false); m_genieItem->setPixmap(m_items[m_index]->pixmap()); m_genieItem->setup(); m_genieItem->animate(0); m_genieItem->setVisible(true); m_genieTimeLine.start();}void GenieDemo::updateGenieEffect(int frame){ qDebug() << frame; m_genieItem->animate(frame);}void GenieDemo::finishGenie(){ delete m_items[m_index]; m_items.removeAt(m_index); m_index = qMin(m_index, m_items.count() - 1); moveSlides(offsetFor(m_index)); m_trashButton->setEnabled(m_items.count() > 1);}#include "genie.moc"int main(int argc, char *argv[]){ QApplication app(argc, argv); GenieDemo genie; genie.setWindowTitle("Image Viewer (with Genie Effect)"); genie.show(); return app.exec();}