Gets the coordinates of the current error point.
(tpm_cleanerrorget clean_id)
Returns a two-dimensional point or nil.
| clean_id | Model ID (real) returned by tpm_cleanalloc |
The error point is a misplaced node. For example, for a line undershoot, the end of the unattached line is the error point.
To specify the error to get, use tpm_cleanerrorcur.