QT学习笔记-24.使用QTimeLine

一个简单的代码如下:

#include <QtGui/QApplication>

#include <QtGui>

#include <math.h>

int main(int argc, char *argv[])

{

 QApplication a(argc, argv);

 QGraphicsItem *ball = new QGraphicsEllipseItem(0,0,20,40);

 QTimeLine *timer = new QTimeLine(15000);

 timer->setFrameRange(0,100);

 QGraphicsItemAnimation *animation = new QGraphicsItemAnimation;

 animation->setItem(ball);

 animation->setTimeLine(timer);

 for(int i = 0; i < 600; ++i)

 animation->setPosAt(i / 600.0, QPointF(i, i));

 QGraphicsScene *scene = new QGraphicsScene();

 scene->setBackgroundBrush(QBrush(Qt::blue));

 scene->setSceneRect(0,0,250,250);

 scene->addItem(ball);

 QGraphicsView *view = new QGraphicsView(scene);

 view->setBackgroundBrush(QBrush(Qt::red));

 view->show();

 timer->start();

 return a.exec();

}

另外一个例子如下:

#ifndef TIMELINE_H
#define TIMELINE_H
#include <QtGui/QWidget>
#include <QVBoxLayout>
#include <QTimeLine>
#include <QProgressBar>
#include <QPushButton>

class timeline : public QWidget
{
    Q_OBJECT
public:
    timeline(QWidget *parent = 0);
    ~timeline();
private:
    QPushButton *pushButton;
    QTimeLine *timeLine;
    QProgressBar *progressBar;
    QVBoxLayout *layout;
};

#endif // TIMELINE_H

#include "timeline.h"

timeline::timeline(QWidget *parent):QWidget(parent)
{
    layout= new QVBoxLayout(this);
    progressBar = new QProgressBar(this);
    progressBar->setRange(0, 100);

    // Construct a 5-second timeline with a frame range of 0 - 100
    timeLine = new QTimeLine(5000, this);
    timeLine->setFrameRange(0, 100);
    connect(timeLine, SIGNAL(frameChanged(int)), progressBar, SLOT(setValue(int)));

    // Clicking the push button will start the progress bar animation
    pushButton = new QPushButton(tr("Start animation"), this);
    connect(pushButton, SIGNAL(clicked()), timeLine, SLOT(start()));
    layout->addWidget(progressBar);
    layout->addWidget(pushButton);
    setLayout(layout);
}

timeline::~timeline()
{
   // No need to delete any QObject that got proper parent pointer.
}

简单的说 QTimeLine就是一个带有线程的对象，通过设置持续时间和帧数来控制动画

FROM: http://www.cppblog.com/gaimor/archive/2011/09/07/155302.html