1) Under Windows, drawing a string horizontally or vertically, takes the
same amount of time.
But antialiasing is better done horizontally, Vertically it does not look
as good.
2) Under OSX, drawing a string horizontally or vertically, takes the same
amount of time,
using the native graphic engine. Antialiasing is equally well horizontally
and vertically.
But using the raster engine, drawing vertically is 15 times slower than
using the native graphic engine.
Antialiasing is equally well horizontally and vertically.
Using the raster engine (on the Mac), is a global startup option.
Is there the possibility to switch back to the native engine for a
particular window or paint device?
Thanks
void TMainWindow::paintEvent(QPaintEvent*)
{
QTime time;
time.start();
QRect r = rect();
QPainter painter(this);
painter.fillRect(r, QBrush(Qt::white));
QFont font = QApplication::font("QMenu");
painter.setFont(QFont(font.family(), 20));
painter.setBackgroundMode(Qt::OpaqueMode);
painter.rotate(90);
painter.translate(0, -r.width());
for (int i = 0; i < 1; i++)
{
painter.drawText(100, 100, "EXAMPLE");
}
QString s = QString::number(time.elapsed());
s += " ms";
painter.drawText(20, 60, s);
}
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