drawing antialiasing line still looks jagged on IPad mini

[iwatsu]

I'm drawing a line using the antialiasing flag. This works fine when running my app on MacOS and Windows but looks jagged when running on a tablet (Ipad mini or IPad 2). I'm using Qt 5.2.1

Any ideas?

if (GetShow())
{
		QColor penColor = mFocused ? mFocusedFillColor : mNotFocusedFillColor;
		penColor.setAlpha( mFocused ? mFocusedOpacity : mNotFocusedOpacity);
		QPen pen(penColor, 0, Qt::SolidLine);
		if (mOverrideDefualtLineStyle)
			pen.setStyle(mLineStyle);
 
		int lineWidth = mFocused ? mLineWidthFocused : mLineWidthNotFocused;
		pen.setWidth(lineWidth);
 
		pen.setCapStyle(Qt::RoundCap);
 
		painter->setPen(pen);
		painter->setRenderHint(QPainter::Antialiasing, true);
		painter->drawLine(mBoxPositionToDraw, mAnchorPositionToDraw);
}

if (GetShow())
{
		QColor penColor = mFocused ? mFocusedFillColor : mNotFocusedFillColor;
		penColor.setAlpha( mFocused ? mFocusedOpacity : mNotFocusedOpacity);
		QPen pen(penColor, 0, Qt::SolidLine);
		if (mOverrideDefualtLineStyle)
			pen.setStyle(mLineStyle);

		int lineWidth = mFocused ? mLineWidthFocused : mLineWidthNotFocused;
		pen.setWidth(lineWidth);

		pen.setCapStyle(Qt::RoundCap);

		painter->setPen(pen);
		painter->setRenderHint(QPainter::Antialiasing, true);
		painter->drawLine(mBoxPositionToDraw, mAnchorPositionToDraw);
}

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