QFontMetrics test

README.md

Output

Qt 4.8.6 On Arch Linux:

"Ricty,10,-1,5,50,0,0,0,0,0" 
width of  'あ'  =  13 
width of  '南'  =  13

Qt 5.4.1 On Arch Linux:

"Ricty,10,-1,5,50,0,0,0,0,0"
width of  'あ'  =  13
width of  '南'  =  7

Qt 5.5 beta On Arch Linux:

"Ricty,10,-1,5,50,0,0,0,0,0"
width of  '00\u3042'  =  13
width of  '00\u5357'  =  7

main.cpp

#include <QApplication>
#include <QFont>
#include <QFontMetrics>
#include <QTextLayout>
#include <QDebug>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QFont f("Ricty",10,50);
    qDebug() << f.toString();
    QFontMetrics fm(f);
    QChar c1(12354);
    QChar c2(21335);
    qDebug() << "width of " << c1 << " = " << fm.width(c1);
    qDebug() << "width of " << c2 << " = " << fm.width(c2);

//    QTextLayout tl(QString(c2),f);
//    qDebug() << tl.boundingRect();

    return a.exec();
}

qfontmetricstest.pro

#-------------------------------------------------
#
# Project created by QtCreator 2015-05-23T21:29:42
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = qfontmetricstest
TEMPLATE = app


SOURCES += main.cpp