void  Widget::paintEvent(QPaintEvent *event)

{

    QPainterPath path;

    QPainter *painter=new QPainter(this);

    QColor color=QColor(Qt::blue);

    int w=200;

    int h=200;

    path.moveTo(-0.083695, 0.283849);

    path.cubicTo(-0.049581, 0.349613, -0.012720, 0.397969, 0.026886, 0.428917);

    path.cubicTo(0.066493, 0.459865, 0.111593, 0.477595, 0.162186, 0.482108);

    path.lineTo(0.162186, 0.500000);

    path.cubicTo(0.115929, 0.498066, 0.066565, 0.487669, 0.014094, 0.468810);

    path.cubicTo(-0.038378, 0.449952, -0.088103, 0.423839, -0.135082, 0.390474);

    path.cubicTo(-0.182061, 0.357108, -0.222608, 0.321567, -0.256722, 0.283849);

    path.cubicTo(-0.304712, 0.262250, -0.342874, 0.239362, -0.371206, 0.215184);

    path.cubicTo(-0.411969, 0.179078, -0.443625, 0.134671, -0.466175, 0.081963);

    path.cubicTo(-0.488725, 0.029255, -0.500000, -0.033043, -0.500000, -0.104932);

    path.cubicTo(-0.500000, -0.218407, -0.467042, -0.312621, -0.401127, -0.387573);

    path.cubicTo(-0.335212, -0.462524, -0.255421, -0.500000, -0.161752, -0.500000);

    path.cubicTo(-0.072998, -0.500000, 0.003903, -0.462444, 0.068951, -0.387331);

    path.cubicTo(0.133998, -0.312218, 0.166522, -0.217440, 0.166522, -0.102998);

    path.cubicTo(0.166522, -0.010155, 0.143394, 0.071325, 0.097138, 0.141441);

    path.cubicTo(0.050882, 0.211557, -0.009396, 0.259026, -0.083695, 0.283849);

    path.moveTo(-0.167823, -0.456963);

    path.cubicTo(-0.228823, -0.456963, -0.277826, -0.432624, -0.314831, -0.383946);

    path.cubicTo(-0.361665, -0.323340, -0.385082, -0.230335, -0.385082, -0.104932);

    path.cubicTo(-0.385082, 0.017569, -0.361376, 0.112025, -0.313964, 0.178433);

    path.cubicTo(-0.277248, 0.229368, -0.228534, 0.254836, -0.167823, 0.254836);

    path.cubicTo(-0.105088, 0.254836, -0.054496, 0.229368, -0.016045, 0.178433);

    path.cubicTo(0.029055, 0.117827, 0.051605, 0.028691, 0.051605, -0.088975);

    path.cubicTo(0.051605, -0.179562, 0.039318, -0.255803, 0.014744, -0.317698);

    path.cubicTo(-0.004337, -0.365409, -0.029705, -0.400548, -0.061362, -0.423114);

    path.cubicTo(-0.093018, -0.445680, -0.128505, -0.456963, -0.167823, -0.456963);

    path.moveTo(0.379011, -0.404739);

    path.lineTo(0.379011, -0.236460);

    path.lineTo(0.486123, -0.236460);

    path.lineTo(0.486123, -0.197292);

    path.lineTo(0.379011, -0.197292);

    path.lineTo(0.379011, 0.134913);

    path.cubicTo(0.379011, 0.168117, 0.383276, 0.190442, 0.391804, 0.201886);

    path.cubicTo(0.400332, 0.213330, 0.411246, 0.219052, 0.424545, 0.219052);

    path.cubicTo(0.435531, 0.219052, 0.446227, 0.215264, 0.456635, 0.207689);

    path.cubicTo(0.467042, 0.200113, 0.474993, 0.188910, 0.480486, 0.174081);

    path.lineTo(0.500000, 0.174081);

    path.cubicTo(0.488436, 0.210509, 0.471957, 0.237911, 0.450564, 0.256286);

    path.cubicTo(0.429170, 0.274662, 0.407054, 0.283849, 0.384215, 0.283849);

    path.cubicTo(0.368893, 0.283849, 0.353859, 0.279094, 0.339115, 0.269584);

    path.cubicTo(0.324371, 0.260074, 0.313530, 0.246534, 0.306592, 0.228965);

    path.cubicTo(0.299653, 0.211396, 0.296184, 0.184075, 0.296184, 0.147002);

    path.lineTo(0.296184, -0.197292);

    path.lineTo(0.223330, -0.197292);

    path.lineTo(0.223330, -0.215667);

    path.cubicTo(0.241833, -0.224049, 0.260697, -0.237992, 0.279922, -0.257495);

    path.cubicTo(0.299147, -0.276999, 0.316276, -0.300129, 0.331310, -0.326886);

    path.cubicTo(0.338826, -0.341070, 0.349523, -0.367021, 0.363400, -0.404739);

    path.lineTo(0.379011, -0.404739);

    path.moveTo(-0.535993, 0.275629);

    painter->translate(rect().right() / 2,rect().bottom() / 2);    窗体的中间绘制

    double scale = qMin(w, h)*8/10.0 ;                             放大系数

    painter->scale(scale, scale);

    painter->setRenderHint(QPainter::Antialiasing);

    painter->save();

    painter->translate(.1, .05);                       添加阴影 颜色为绿色

    painter->fillPath(path, QColor(0, 255, 0, 63));

    painter->restore();

    painter->setBrush(color);

    painter->setPen(QPen(Qt::black, 0.02, Qt::SolidLine, Qt::FlatCap, Qt::RoundJoin));

    painter->drawPath(path);