better patterns

README.md

@@ -41,7 +41,7 @@ New plans start with a random laying pattern. Click the numbered room, materials
 - Geometry follows measured vectors, checks final-wall length/direction, detects crossings and validates opening bounds and overlaps. A small accepted closure residual snaps only the final wall to the origin, with a visible warning. A mismatch can indicate measurement error or an irregular wall; lengths and corner angles alone cannot identify or reconstruct a bow. Remeasure and represent known changes of direction as additional segments.
 - Polygon offsets and clipping use `clipper-lib` at 0.001 mm internal precision. Displayed cut dimensions round up to the next 0.5 mm; angles display to 0.1°. New cutting blanks reserve that rounded length plus kerf so the displayed cuts fit their source board. Finished polygon coordinates retain their original precision. The supplied cut templates contain board-relative polygon vertices and edge lengths for angled and notched pieces.
 - Laminate is inset from every wall, including fireplace recesses. Interior rows retain full factory width. When the final row would be narrower than the minimum, the first and last rows share the width equally. A bounded search also compares other feasible edge-row arrangements, including row seams aligned with inward corners to avoid unnecessary notches and tapered tips.
-- Brick uses a half-board stagger. Random is deterministic and discourages staircase runs, near-equal successive steps and repeating joint alignments, including steps that wrap across a board length. Pattern preferences never invalidate a physically valid plan when tight offset limits force repetition. The offset is the nearest end-joint distance on the adjacent row's grid, not a distance from a wall. Half a board is the largest possible nearest-joint offset. Settings that cannot be met produce an error instead of a partial layout.
+- Brick uses a half-board stagger. Random is deterministic and discourages staircase runs, near-equal successive steps and repeating joint alignments, including steps that wrap across a board length. H-pattern avoidance checks joints two rows apart at the scale of a board width, so small misalignments still count as a visible repeat. Pattern preferences never invalidate a physically valid plan when tight offset limits force repetition. The offset is the nearest end-joint distance on the adjacent row's grid, not a distance from a wall. Half a board is the largest possible nearest-joint offset. Settings that cannot be met produce an error instead of a partial layout.
 - Minimum laminate sizes apply to each clipped piece's bounding length/width. Irregular shapes can still have narrow tips or necks; their exact templates are available in the cut popups. Product-specific click systems and assembly sequences are not simulated.
 - Offcut reuse preserves the needed left/right factory ends. Only full-width end remnants are available for reuse; ripped side strips and shaped scraps are conservatively waste. Crosscuts include kerf. The stock count is actual allocated boards, not an area-only estimate. Waste includes kerf and unused material, including still-usable stock remainders.
 - Skirting internal corners use coped joints. The blank keeps the wall-corner long point instead of subtracting the receiving board’s thickness; the cope preparation is half the measured turn. Earlier walls receive adjoining later walls, so installation order has no cycle. At square corners, a 4,000 mm wall keeps a 4,000 mm blank; with 18 mm skirting at both corners its exposed front length is 3,964 mm. Non-square receiving ends have a wall-fitting bevel. External corners use equal mitres. Minimum sizes check the exposed face and installed body after corner and door allowances. Preparation previews and dashed body edges guide marking; the actual moulding profile must be scribed and back-cut, since thickness alone does not define it. This follows [Gary Katz’s coping and long-point measurement guidance](https://www.finehomebuilding.com/pdf/021174063.pdf); the general-angle allowances are derived from intersecting wall faces.