AFAIK, the qwt do not published wit the cmake support. It has only the qmake configuration.

Hi,

@WLOrion said in Introduction in Qwt:

I didn't know this behavior of the Qwt Classes.

This is nothing Qwt specific, it's part of the C++ basics.

As for tutorial, there's a nice online book that is in German but the author claims that online translator should give you a good enough result in your own language.

@BJUN

Hi and welcome to devnet forum

qwt is an extension of Qt as third party library. It maintains its own mailing list. Please check out there. This might be a faster way to get feedback on the issue.

ok, stupid me! I forgot to include Qwt in the *.pro file:

... CONFIG += qwt INCLUDEPATH +="/usr/include/qwt" LIBS += -L/usr/lib -lqwt

@mrjj
Thank you sir for helping me and direction. I am able to solve this issue by

setting the clipping area properly on graph. Use QWidget::update() instead of QWidget::repaint().

@Yash001
Hi, i wish i knew the answer
but im fairly sure canvas()->width(); just returns the actual widget size and
not the zoomed area as such.

Had a look in the help but didnt find the answer on how to get the extent on a zoomed canvas.

@DSpider great! please don't forget to mark your post as solved. Thanks.

@SGaist got it.

Perhaps some dll files are missing.

User something like LIBS += -F /path/to/where/qwt_framework_is -framework qwt

@SGaist It worked. Thank you so much.

@vassia

Thanks for reply and good to know that I could help.

Since the issue has been solved for you, please mark also your post as solved. This helps others to see that there might be a solution.

In order to mark as solved, go to the compobox named "Topic Tools" after your first post or after the last post in the thread and select "Mark as Solved".

https://postimg.org/image/cttygz5nd/

Edit: Fixed link to image -- @Wieland

Hi to all,
I succeded in extracting from the data contours as path. Anyone knows how to plot them using qt charts?

http://doc.qt.io/qt-5/qtcharts-areachart-example.html

I need to create area charts with empty areas inside.