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Action:
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Creates a new pattern by applying a periodic keep filter to an existing pattern.
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Filename:
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kern/kern_scm/pattern_scm.cxx
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APIs:
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api_periodic_keep_pattern
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Syntax:
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(pattern:periodic-keep pat keep which-dim [merge=#t])
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Arg Types:
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pat
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pattern
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keep
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boolean
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which-dim
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integer
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merge
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boolean
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Returns:
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pattern
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Description:
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Applies a periodic keep filter to an existing pattern, merging with any existing filter or, optionally (with
merge=#f), replacing it.
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pat specifies a pattern.
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keep is the list of successive keep values, so that the size of the list is the periodicity of the filter.
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which-dim specifies the dimension within which the filter is applied.
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If
merge is specified as
#f, the existing pattern is replaced. The default value is
#t.
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Example:
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; pattern:periodic-keep
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; make a prism
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(define height 1)
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;; height
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(define maj_rad 1)
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;; maj_rad
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(define min_rad 0.5)
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;; min_rad
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(define num_sides 3)
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;; num_sides
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(define prism (solid:prism height
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maj_rad min_rad num_sides))
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;; prism
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; position the prism
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(define origin (position 1 2 3))
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;; origin
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(define transform (entity:transform prism
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(transform:axes
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origin (gvector 1 0 0) (gvector 0 1 0))))
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;; transform
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; make a pattern
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(define x-vec (gvector 4 0 0))
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;; x-vec
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(define num_x 6)
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;; num_x
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(define y-vec (gvector 0 2 0))
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;; y-vec
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(define num_y 12)
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;; num_y
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(define z-vec (gvector 0 0 3))
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;; z-vec
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(define num_z 4)
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;; num_z
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(define pat (pattern:linear x-vec num_x
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y-vec num_y z-vec num_z))
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;; pat
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; modify the pattern
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(define keep1 #t)
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;; keep1
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(define keep2 #t)
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;; keep2
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(define keep3 #f)
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;; keep3
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(define dim 1)
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;; dim
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(set! pat (pattern:periodic-keep pat
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(list keep1 keep2 keep3) dim))
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;; #[pattern
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;; trans-vec:
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"DOMAIN(X*VEC(4,0,0)+X2*VEC(0,2,0)
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;; +X3*VEC(0,0,3),0,5,0,11,0,3)"
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;; x-vec:
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"null_law"
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;; y-vec:
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"null_law"
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;; z-vec
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"null_law"
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;; scale:
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"null_law"
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;; keep:
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"null_law"
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;; no list]]
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; apply the pattern to the prism
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(define body (entity:pattern prism pat))
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;; body
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