gen_parallel_contour_xldgen_parallel_contour_xldGenParallelContourXldGenParallelContourXldgen_parallel_contour_xld (Operator)
Name
gen_parallel_contour_xldgen_parallel_contour_xldGenParallelContourXldGenParallelContourXldgen_parallel_contour_xld — Compute the parallel contour of an XLD contour.
Signature
Description
gen_parallel_contour_xldgen_parallel_contour_xldGenParallelContourXldGenParallelContourXldgen_parallel_contour_xld computes for each of the input
contours ContoursContoursContourscontourscontours a parallel contour with distance
DistanceDistanceDistancedistancedistance. The resulting contours are returned in
ParallelContoursParallelContoursParallelContoursparallelContoursparallel_contours. To calculate the parallel contour, the
normal vector of the input contour is needed in every contour point.
The parameter ModeModeModemodemode determines how these normal vectors are
computed. If ModeModeModemodemode = 'gradient'"gradient""gradient""gradient""gradient", it is assumed
that the input contours are edges, and the normal information is
obtained from the gradient direction of the edge (see
edges_sub_pixedges_sub_pixEdgesSubPixEdgesSubPixedges_sub_pix). For this, the attribute
'edge_direction'"edge_direction""edge_direction""edge_direction""edge_direction" must exist for the input contour
(see get_contour_attrib_xldget_contour_attrib_xldGetContourAttribXldGetContourAttribXldget_contour_attrib_xld).
If ModeModeModemodemode = 'contour_normal'"contour_normal""contour_normal""contour_normal""contour_normal", a possibly existing
normal information is used to determine the normals. For this, the
contour attribute 'angle'"angle""angle""angle""angle" must exist (see
lines_gausslines_gaussLinesGaussLinesGausslines_gauss or edges_sub_pixedges_sub_pixEdgesSubPixEdgesSubPixedges_sub_pix). Finally, if
ModeModeModemodemode = 'regression_normal'"regression_normal""regression_normal""regression_normal""regression_normal", the normal vectors are
determined from a local line fit to each contour point. Here, the
normal vectors are oriented such that they point to the right side
of the contour when the contour is traversed from start to end. In
contrast to the first two modes, this mode can be used for all XLD
contours, no matter how they were generated.
Execution Information
- Multithreading type: reentrant (runs in parallel with non-exclusive operators).
- Multithreading scope: global (may be called from any thread).
- Processed without parallelization.
Parameters
ContoursContoursContourscontourscontours (input_object) xld_cont-array → objectHXLDContHObjectHObjectHobject
Contours to be transformed.
ParallelContoursParallelContoursParallelContoursparallelContoursparallel_contours (output_object) xld_cont-array → objectHXLDContHObjectHObjectHobject *
Parallel contours.
ModeModeModemodemode (input_control) string → HTuplestrHTupleHtuple (string) (string) (HString) (char*)
Mode, with which the direction information is computed.
Default:
'regression_normal'
"regression_normal"
"regression_normal"
"regression_normal"
"regression_normal"
Suggested values:
'gradient'"gradient""gradient""gradient""gradient", 'contour_normal'"contour_normal""contour_normal""contour_normal""contour_normal", 'regression_normal'"regression_normal""regression_normal""regression_normal""regression_normal"
DistanceDistanceDistancedistancedistance (input_control) number → HTupleUnion[float, int]HTupleHtuple (real / integer) (double / int / long) (double / Hlong) (double / Hlong)
Distance of the parallel contour.
Default:
1
Suggested values:
0.2, 0.4, 0.6, 0.8, 1, 2, 3, 4, 5, 7, 10, 15, 20, 30, 40, 50
Possible Predecessors
gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldgen_contours_skeleton_xld,
lines_gausslines_gaussLinesGaussLinesGausslines_gauss,
lines_facetlines_facetLinesFacetLinesFacetlines_facet,
edges_sub_pixedges_sub_pixEdgesSubPixEdgesSubPixedges_sub_pix,
threshold_sub_pixthreshold_sub_pixThresholdSubPixThresholdSubPixthreshold_sub_pix
Possible Successors
gen_polygons_xldgen_polygons_xldGenPolygonsXldGenPolygonsXldgen_polygons_xld
See also
get_contour_xldget_contour_xldGetContourXldGetContourXldget_contour_xld
Module
Foundation