Qt：设置动画效果

我会带着你远行 2022-10-24 11:45 259阅读 0赞

#include <QGraphicsLineItem>
    #include <QGraphicsTextItem>
    #include <QGraphicsPixmapItem>
    #include <QGraphicsItemAnimation>  //动画
    #include <QTimeLine>
    
    Widget::Widget(QWidget *parent)
        : QWidget(parent)
    {
        QGraphicsLineItem *lineItem;
        QGraphicsTextItem *textItem;  //因为要设置属性，所以把它单独提出来
        QGraphicsPixmapItem *pixmapItem;
         _view = new QGraphicsView(this);
         _view->setBackgroundBrush(QBrush(Qt::gray));  //设置_view的背景色
         _view->setScene(_scene = new QGraphicsScene);
         _scene->addItem(lineItem = new QGraphicsLineItem(QLineF(0, 0, 100, 100)));
         _scene->addItem(textItem = new QGraphicsTextItem("hello world"));
         textItem->setPos(QPointF(100, 100));
         textItem->setFont(QFont("aaa", 50, 100, true));  //设置字体
         
         
         
         _scene->addItem(pixmapItem = new QGraphicsPixmapItem(QPixmap("../test1.bmp")));
         pixmapItem->setScale(0.2);
         pixmapItem->setFlag(QGraphicsItem::ItemIsMovable);
    
         QGraphicsItemAnimation *animation = new QGraphicsItemAnimation;
         animation->setItem(pixmapItem);
    
         QTimeLine *timeLine = new QTimeLine(3000);  //3ms动一次
         timeLine->setLoopCount(100);   //设置循环次数
         
         animation->setTimeLine(timeLine);  //怎么动
         animation->setTranslationAt(1, 200, 200);  //step, dx, dy
    
         timeLine->start();   //开始循环
    }

![189da84d0b1a32330a7fec20f4f2e710.png][]

void Widget::resizeEvent(QResizeEvent *)
    {
        _view->setGeometry(QRect(QPoint(0, 0), size())); //设置_view的大小为widget的大小
    }

[189da84d0b1a32330a7fec20f4f2e710.png]: /images/20221024/ab0f7449052f4228b1146f7638fe22af.png