pub fn inner_corner_lattice(
quads: &[LinkedQuad],
coords: &HashMap<usize, QuadGrid>,
) -> Vec<((i32, i32), (f32, f32))>Expand description
Inner board corners with their lattice coordinates (unordered).
Inner corners are the lattice points referenced by two or more quads (the interior points where black squares meet); outer-boundary corners, touched by a single quad, are excluded. Linked corners are already snapped to a shared position, so all references to a lattice point coincide.