Re: Porting from Qwt5 to Qwt6: QwtMetricsMap

[Uwe R. <Uwe...@ti...>]

On 9/4/19 9:43 AM, ams...@we... wrote:

> I am porting an old application from Qwt5 to Qwt6 and I don't know how 
> to port the followin code as in Qwt6, the class QwtMetricsMap has 
> disappeared:

QPainter offers a floating point based API since Qt4 and as Qwt6 does 
not support Qt3 anymore there is no reason for scaling coordinates 
manually according to the resolution of the paint device. Instead you 
can simply use QPainter::setWorldMatrix and friends.

Don't know the context of your code - but if it helps you can have a 
look at the implementation of QwtPlotRenderer::render. In 
QwtPlotRenderer::renderDocument you can see how QPdfWriter can be 
initialized to match a given physical size and resolution.

HTH,
Uwe