When slicing a shape using two landmarks, or functions such as coo_up,
an open curve is obtained and the rank of points make wrong/artefactual results.
If the widest gap is > 5 * median of other gaps, then the couple of coordinates
forming this widest gap is used as starting and ending points. This switch helps
to deal with open curves. Examples are self-speaking.
Use force=TRUE to bypass this check
Arguments
- coo
matrixof(x; y)coordinates or any Coo object.- force
logicalwhether to use the widest gap, with no check, as the real gap
Value
a matrix of (x; y) coordinates or a Coo object.
See also
Other sliding functions:
coo_slidedirection(),
coo_slide()
Other coo_ utilities:
coo_aligncalliper(),
coo_alignminradius(),
coo_alignxax(),
coo_align(),
coo_baseline(),
coo_bookstein(),
coo_boundingbox(),
coo_calliper(),
coo_centdist(),
coo_center(),
coo_centpos(),
coo_close(),
coo_down(),
coo_dxy(),
coo_extract(),
coo_flipx(),
coo_force2close(),
coo_interpolate(),
coo_is_closed(),
coo_jitter(),
coo_left(),
coo_likely_clockwise(),
coo_nb(),
coo_perim(),
coo_range(),
coo_rev(),
coo_right(),
coo_rotatecenter(),
coo_rotate(),
coo_sample_prop(),
coo_samplerr(),
coo_sample(),
coo_scale(),
coo_shearx(),
coo_slice(),
coo_slidedirection(),
coo_slide(),
coo_smoothcurve(),
coo_smooth(),
coo_template(),
coo_trans(),
coo_trimbottom(),
coo_trimtop(),
coo_trim(),
coo_untiltx(),
coo_up(),
is_equallyspacedradii()
Examples
cat <- coo_center(shapes[4])
coo_plot(cat)
# we only retain the bottom of the cat
cat_down <- coo_down(cat, slidegap=FALSE)
# see? the segment on the x-axis coorespond to the widest gap.
coo_plot(cat_down)
# that's what we meant
coo_plot(coo_slidegap(cat_down))
