how to draw points with qpainter?

[athulms]

void MainWindow::mousePressEvent(QMouseEvent *f)
{
    point=f->pos();
    y=1;
    update();
}
 
void MainWindow::paintEvent(QPaintEvent *e)
{
        QPainter painter(this);
        QPen linepen(Qt::red);
        linepen.setCapStyle(Qt::RoundCap);
        linepen.setWidth(30);
        painter.setRenderHint(QPainter::Antialiasing,true);
        painter.setPen(linepen);
        if(y==1)
        painter.drawPoint(point);
 
}

void MainWindow::mousePressEvent(QMouseEvent *f)
{
    point=f->pos();
    y=1;
    update();
}

void MainWindow::paintEvent(QPaintEvent *e)
{
        QPainter painter(this);
        QPen linepen(Qt::red);
        linepen.setCapStyle(Qt::RoundCap);
        linepen.setWidth(30);
        painter.setRenderHint(QPainter::Antialiasing,true);
        painter.setPen(linepen);
        if(y==1)
        painter.drawPoint(point);

}

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i have used the code. but draws only single point. when i click to draw a second point the first point will disappear. at a time only one point will appear..

[stampede]

Its because paintEvent clears the widget before painting, so everything previously painted is gone.
You should try using a QList of points to store every clicked point and paint all of them.