DTL FontMaster Manual1.1 PDF

dtl contourmaster: options
3.13 Straight sections
This function checks whether a Bezier section is nearly a straight line.
It can replace these section by a straight line if both control points are within
the specified channel tolerance.
3.14 Double points
This function is the classical check for double points. If the distance of two
neighboured anchor points is less than the tolerance specified, the second
point will be deleted.
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This bezier section is nearly straight.
The channel defined by the tolerance
is indicated with dashed lines. If both
control points are within this channel,
the Bezier curve will be changed to a
straight line.
After the point is deleted, the contour
looks like this: