一个关于时间线使用的qt代码

qt 时间线 对初学者很有帮助 /*************************************************************************** * Copyright (C) 2009 by shiroki@www.cuteqt.com* * shiroki@cuteqt.com * * * ***************************************************************************/ #include #include #include #include #include #include #include #include "mainwin.h" #define QUANTITY 20 MainWin::MainWin(QWidget*p, Qt::WFlags f) :QWidget(p), pixmap("./background.png") { setFixedSize(800,600); QTimeLine* tl = new QTimeLine(2000, this);//total time connect(tl, SIGNAL(frameChanged(int)), this, SLOT(changePixmap(int))); tl->setFrameRange(0,100);//max value tl->setCurveShape(QTimeLine::LinearCurve); tl->setUpdateInterval(100);//step tl->start(); } void MainWin::paintEvent(QPaintEvent*e) { QPainter painter(this); painter.setClipRect(e->rect()); painter.drawPixmap(e->rect(),pixmap, e->rect()); } void MainWin::changePixmap(int value) { static int oldx = 0; qWarning() << "change pixmap..." << value; QPainter p(&pixmap);//change pixmap int width = pixmap.width(); if( width > rect().width()) width = rect().width(); int height = pixmap.height(); if( height > rect().height()) height = rect().height(); int x = width * value / 100; QRect updaterect(oldx, 0, x-oldx + 1, height); qWarning() << value << x << oldx ; p.fillRect(updaterect, QColor(Qt::black)); //p.fillRect(updaterect, palette().color(QPalette::Base)); repaint(updaterect); oldx = x; }