#include <QtGui/QApplication>
#include "lblfont.h"
#include<QWidget>
#include<QFormLayout>
#include<QPainter>
#include<QFont>
#include<QFontMetrics>
#include<QString>
#include<QLabel>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget *win=new QWidget();
    QFormLayout *lay=new QFormLayout();
    QFont f("Helvetica",6);
    QFontMetrics fm(f);
    int pixelsWide = fm.width("What's the width of this text?");
    int pixelsHigh = fm.height();
    QString str;
    QString str2;
    str=str.number(pixelsWide);
    str2=str2.number(pixelsHigh);
    QLabel *lbl=new QLabel();
    QLabel *lbl1=new QLabel();
    QLabel *lbl2=new QLabel("Text width in Pixels:");
    QLabel *lbl3=new QLabel("Text height in Pixels:");
    lbl->setText(str);
    lbl1->setText(str2);
    lay->addRow(lbl2,lbl);
    lay->addRow(lbl3,lbl1);
    win->setLayout(lay);
    win->show();
    return a.exec();
}

void QMyWidget::paintEvent(QPaintEvent*)
    {
    QPainter painter(this);
 
    // Create font
    QFont f("Helvetica",6);
    // Set current font
    painter.setFont(f);
    // Set font color
    painter.setPen(Qt::white);
    // Get QFontMetrics reference
    QFontMetrics fm = painter.fontMetrics();
 
    QString text = "helloworld";
 
    // Calculate text center position into the screen using QFontMetrics class
    QPoint center = QPoint((widgetSize.width()-fm.width(text))/2,
                           fm.height());
 
    // QFontMetrics::width() gives calculated text width with current QFont in QPainter
    // QFontMetrics::height() gives text height
 
    painter.drawText(center,text);
    }