How to draw the graph in the center of the window and scale it reasonably by Qt5

I now have some coordinate pairs of broken lines, which need to be drawn with Qt, that is, to connect these coordinate points with line segments. Now that I can draw the broken line correctly, I try to move the graph to the center of the window with the following code: 

</span><br>:


 1.15109497070313E+02 2.73440704345703E+01
 1.15115196228027E+02 2.73563938140869E+01
 1.15112876892090E+02 2.73697128295898E+01
 1.15108222961426E+02 2.73687496185303E+01
 1.15081001281738E+02 2.73908023834229E+01
 1.15078292846680E+02 2.73949108123779E+01
 1.15073806762695E+02 2.74090080261230E+01
 1.15063293457031E+02 2.74221019744873E+01
 1.15059646606445E+02 2.74324569702148E+01


 so I think my problem now is how to move the graphics to the center of the window and zoom in properly to make the graphics show more clearly? I used to use MFC, in MFC through the coordinate transformation of windows and viewports, but I don"t know much about the principle, so coordinate transformation is real to me. How to solve this problem reasonably in Qt?
Qt5 cPP
Aug.12,2021

Previous: What format is this? Is it a picture or a file?

Next: Svg animateMotion dynamically added via js is invalid

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e45f59-590fd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e45f59-590fd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?