release下的exe文件流畅度要远好于debug下的exe文件。

 源码来源：基于Qt5模拟企业微信聊天界面(QWidget)_阿木大叔mu的博客-CSDN博客

 初看时，觉得很神奇，猫眼会随着鼠标移动。

看完源码后，感觉很精美。

 

 全是用painter画上去的，全是画pixmap。

关于画猫，画起来其实对我来说很困难。

他的源码如下：

先偏移（translate），再等比例缩放（scale）

之后就相当于在1920*1080大小的空间画图了。（因为图片是1920*1080像素的）

之后就是扣位置了。（我做不到这么细致）

通过改变参数m_fXRadio,m_fYRadio的大小改变眼睛的位置。

    painter->save();
    painter->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform | QPainter::TextAntialiasing, true);
    painter->translate(rectMain.left(), rectMain.top());
    painter->scale(rectMain.width() / 1920.0, rectMain.height() / 1080.0);

    QRect rcImgRain(0, 0, 1920, 1080);//彩虹
    QPixmap pRain = m_pixRain.scaled(rcImgRain.size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    painter->drawPixmap(rcImgRain, pRain);

    QRect rcImgEyeBg(730, 335, 283, 162);//眼背景(黄)
    QPixmap pImgEyeBg = m_pixCatEyeBg.scaled(rcImgEyeBg.size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    painter->drawPixmap(rcImgEyeBg, pImgEyeBg);

    //眼黑左
    QRect rcImgEyeBlackLeft(730 + 120 * m_fXRadio - 80 / 2, 335 + 120 * m_fYRadio - 82 /2, 80, 82);
    QPixmap pImgEyeBlack = m_pixCatEyeBlack.scaled(rcImgEyeBlackLeft.size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    painter->drawPixmap(rcImgEyeBlackLeft, pImgEyeBlack);
    //眼白左
    QRect rcImgEyeWriteLeft(rcImgEyeBlackLeft.left() + 16, rcImgEyeBlackLeft.top() + 16, 20, 20);
    QPixmap pImgEyeWriteLeft = m_pixCatEyeWhite.scaled(rcImgEyeWriteLeft.size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    painter->drawPixmap(rcImgEyeWriteLeft, pImgEyeWriteLeft);

    QRect rcImgEyeBlackRight(895 + 120 * m_fXRadio - 80 / 2, 387 + 120 * m_fYRadio - 82 /2, 80, 82);
    pImgEyeBlack = m_pixCatEyeBlack.scaled(rcImgEyeBlackRight.size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    painter->drawPixmap(rcImgEyeBlackRight, pImgEyeBlack);

    QRect rcImgEyeWriteRight(rcImgEyeBlackRight.left() + 16 , rcImgEyeBlackRight.top() + 16, 20, 20);
    QPixmap pImgEyeWriteRight = m_pixCatEyeWhite.scaled(rcImgEyeWriteRight.size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    painter->drawPixmap(rcImgEyeWriteRight, pImgEyeWriteRight);

    QRect rcImgCat(0, 0, 1920, 1080);
    QPixmap p = m_pixCat.scaled(rcImgCat.size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    painter->drawPixmap(rcImgCat, p);

    painter->restore();