Thanks for your help.
After loading the MPR using volume and volumMapper, I referred to the demo and have implemented and displayed lines for circles, ellipses, and rectangles.
But when using its LineWidget component to measure straight lines, the lines still cannot be displayed, and I have no other way. It’s really difficult for me, a beginner, to adjust the thickness and color of the lines to match the circular, elliptical, and rectangular styles.
Are the usage methods of LineWidget and PaintWidget different?
What should I do? I’m very distressed!