The engraving counterpart of hachure_fill_multi(): instead of one uniform
hatch, it lays down a engrave_ladder() of hatch layers and keeps each layer
only where the field tone reaches that layer's threshold, so line density
(and cross-hatching) tracks the tone continuously across the region. Holes
are handled exactly as in hachure_fill_multi() (shared even-odd scan-line).
engrave_fill(
rings,
field,
ladder = NULL,
roughness = 0.5,
bowing = 0,
sample_step = NULL,
seed = NULL,
...
)A list of 2-column (x, y) stroke matrices (same structure as
hachure_fill_multi()), densest where the field is darkest.
A list of rings, each list(x, y) of vertex coordinates in
inch/data space (see hachure_fill_multi()).
A vectorised tone function function(x, y) returning a value in
[0, 1] per point (0 = lightest/paper, 1 = darkest/solid).
A hatch ladder from engrave_ladder(); if NULL, a default
ladder is built from ....
Sketch params applied to each surviving stroke. Defaults 0.5 and 0.
Tone-sampling step along each scan line (inches). NULL
(default) uses a fraction of the finest ladder pitch.
Integer seed.
Passed to engrave_ladder() when ladder is NULL.
Other sketch-core:
arrowhead(),
curve_fill(),
engrave_ladder(),
hachure_fill(),
hachure_fill_multi(),
leader_path(),
repel_layout(),
rough_arc(),
rough_bezier(),
rough_ellipse(),
roughen_polyline(),
sketch_arrowheads(),
sketch_fill(),
sketch_fill_multi(),
spray_scatter(),
stroke_profile(),
stroke_ribbon(),
treemap_layout(),
wash_bleed(),
watercolor_wash(),
watercolor_wash_multi()