QPainterPath判断点是否在路径内

QPainterPath判断给定点是否在路径内是通过contains方法进行判断，该例子中判断鼠标移动点位生效需要添加setMouseTracking(true)方法。以下为具体实现：

#include <QPainter>
#include <QMouseEvent>
#include <QDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    setMouseTracking(true);
}

Widget::~Widget()
{

}

static QPainterPath path;
static QString strShow="not init";
void Widget::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event);

    QPainter painter(this);
    painter.fillRect(this->rect(),QBrush(QColor(255,255,255)));
    painter.setRenderHint(QPainter::Antialiasing,true);//抗锯齿

    QRect rt(this->width()/2-100,this->height()/2-50,200,100);
    painter.fillRect(this->rect(),QBrush(QColor(0,0,0)));
    painter.fillRect(rt,QBrush(QColor(0,255,0,100),Qt::BrushStyle::Dense6Pattern));

    path = QPainterPath();
    path.addEllipse(this->rect());
    painter.setPen(QColor(255,0,0));
    painter.drawPath(path);

    painter.setFont(QFont("New Roman",30,30,false));
    painter.drawText(rt,Qt::AlignCenter,strShow);
}

void Widget::mouseMoveEvent(QMouseEvent *event)
{
    if(path.contains(event->pos()))
    {
        qDebug()<<"in";
        strShow = "in";
    }
    else
    {
        qDebug()<<"out";
        strShow = "out";
    }
    update();
}