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

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