How to delete points or lines on Canvas?

Hi, all,
Now i can draw curves by clicking several points on the canvas following some algothem.
If i don't like the curve, i intend to delete by remove some of the points i have choosed and  try new points again.
Does anybody know how i should do this? do i need to creat a new canvas group for each point so that i would use g_object_destroy (group) to remove the portion of curve?
is it the only way??
It's kind of urgent
Thanks in advance.

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