Circle construction

Selected lines from the native construction fixture. The caller binds the common reach to the radius, then selects the circle, partition or landmark reader.

let $origin = point(carrier(), 0);
let $outward = orthogonal($origin);
let $contour = crystal($outward);
let $offset_pattern = $outward -> (?reach -> $contour);
let $ray = crystal(orthogonal($origin -> $origin));
let $radial_start = point($ray, 0);
let $radial_end = point($ray, 1);
let $radius = $radial_start -> $radial_end;
let $start = point($contour, 0);
let $radial = group($origin -> $radial_start, $radius, $radial_end -> $start);
root bind(?reach, $radius);
let $end = point($contour, 1);
let $whole = $start -> $end;
let $closure = $end -> $start;
let $circle_pattern = group($offset_pattern, $radial, $whole, $closure);
let $fourths = carrier(subdivision(unit_of($contour), 4));
let $four = group($circle_pattern, span($fourths, 0, 4) -> $whole);
root group($four, point($fourths, 1));

Full authored fixture

In the earlier example, let $anchor = $origin -> $centre; created a relation from the original point to its supplied X/Y representation, then gave that relation a local name. It was neither an alias for the point nor a pre-existing circumference marker. That later example now calls it $centre_representation. This construction has one source point and needs no such coordinate representation.