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Action:
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Undoes a move applied to a single element of an existing pattern.
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Filename:
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kern/kern_scm/pattern_scm.cxx
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Syntax:
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(pattern:undo-move-element pat coords)
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Arg Types:
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pat
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pattern
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coords
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pair
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Returns:
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pattern
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Description:
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Undoes all moves applied to the pattern element specified by
coords, restoring it to its original position within the pattern.
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pat specifies a pattern.
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coords identifies the element in the pattern.
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Example:
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; pattern:undo-move-element
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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 2 0 0))
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;; x-vec
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(define num_x 8)
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;; num_x
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(define y-vec (gvector 0 3 0))
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;; y-vec
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(define num_y 8)
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;; num_y
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(define pat (pattern:linear x-vec num_x y-vec num_y))
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;; pat
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; move one of the pattern elements
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(define disp (gvector 0.4 1.2 0.5))
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;; disp
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(define move (transform:translation disp))
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;; move
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(set! pat (pattern:move-element pat (list 3 2) move))
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;; #[pattern
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;; trans-vec:
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"DOMAIN(X*VEC(2,0,0)+X2*VEC
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;; (0,3,0),0,7,0,7)"
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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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;; [list]]
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; undo the move
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(set! pat (pattern:undo-move-element pat (list 3 2)))
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;; #[pattern
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;; trans-vec:
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"DOMAIN(X*VEC(2,0,0)+X2*VEC
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;; (0,3,0),0,7,0,7)"
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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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;; [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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