Hello, Julien Finet, thank you for your response to this question.
The window.devicePixelRatio value is 1.25.
I implemented MPR using volume, volumMapper, GenericRenderWindow, and vtkInteractorStyleMPRSlice.
There is a renderer in GenericRenderWindow, but when I was using LineWidget for measurement, I recreated a renderer,
As with my code above, I’m not sure if this is the right thing to do. Currently, both the measurement line and value have been displayed, only the handle and mouse positions are not aligned.