.DO YOU NEED THINNING CUTOFF DATA FIRST: (Y/N): Y
["Yes" gives a summary of the minimum and maximum line
lengths and maximum interline angles for adjacent
line segments which occur in the contour file.
This data is useful for specifying the thinning
parameters.]
.DO YOU WANT TO OK EACH CONTOUR THINNING: (Y/N): N
["Yes" allows one to reject the thinning which is
performed on each contour. This is useful to avoid
over thinning a contour and altering its shape
excessively. A "No" answer will automatically
thin all of the contours based on the thinning
parameters and replace them in the contour file.]
.ENTER MAX LENGTH FOR NEW LINES: 0.1
[However, if deletion of a line segment results in a new
line segment longer than this limit the segment will not
be deleted.]
.ENTER MAX ANGLE BETWEEN RETAINED LINES (NEAR 180): 179
[Adjacent lines segments which have an angle between
them greater than this limit are merged into a
single line segment. E.g. all pairs of line segments
separated by angles greater than 179 will have the
beginning point of the second line segment deleted
so as to from a new longer line. However, thisdeletion
is subject to the restraint requested in the previous
question.]
.ENTER MIN. SIZE CONTOUR TO BE THINNED: 8
[Any contour shorter than this limit is not
thinned at all. E.g. contours less than eight
points long will not be thinned.]
The length of each contour before and after thinning is then listed. The contour is displayed if the user has asked to view them and the following question appears.
.0.K. TO STORE THIS THINNED CONTOUR? (Y/N): Y
[A "No" answer aborts thinning of this contour
and following question appears.]
.CHANGE THINNING PARAMETERS AND TRY AGAIN? (Y/N): Y
[Allows the user to alter the minimum and maximum
lengths and angle which have previously been input
and attempt to thin the contour again using these
new parameters.
NOTES