Calculations

Calculations

• Arc walls as chords

  Writes each arc wall out as short chords so the room can be tested as a polygon.

  step = 2 × acos(max(0, 1 − 0.5 ÷ r)); n = ⌈|sweep| ÷ step⌉, between 4 and 400

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Free outline with slanted and arc walls

  Checks an outline of any angle with arc edges and returns its corners, arcs and overall width and depth.

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Wall frames, lengths and corner turns

  For each wall: its length, direction, the frame cabinets are placed in, its angle and the turn at each corner.

  chord = √(Δx² + Δy²); u = Δ ÷ chord; n = (−u_y, uₓ); angle = atan2(u_y, uₓ) × 180 ÷ π

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Point inside the room

  Tests whether a point is inside the outline; the boundary counts as inside.

  on edge when |cross| < 1e-4 × max(1, edge length); else even-odd count of edges crossed by a ray

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Cabinet footprint inside the room

  Decides whether a polygon lies inside the room.

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Distance from a point to a wall segment

  The shortest distance from a point to a segment.

  t = clamp((p − a)·(b − a) ÷ |b − a|², 0, 1); d = |p − (a + t (b − a))|

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Clearance from a footprint to the nearest wall

  The smallest distance between a footprint and any wall, 0 when they touch or cross.

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Door and window positions along a wall

  Clamps each opening's width, offset, height and sill to its wall and the room height.

  inch default = mm default × (1 ÷ 25.4); at ≤ chord − w

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Floor strip in front of an opening

  The four corners of the strip of floor in front of a door or window, in room coordinates.

  P(s, o) = origin + u × s + n × o

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Typed corner coordinates

  Reads x,y pairs typed by a person.

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Outline from edge lengths and turns

  Corners of a right-angled outline from the length of each edge and a left or right turn at each corner.

  pᵢ₊₁ = pᵢ + dir × lengthᵢ; dir turns by ±90°

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Outline from typed walls

  Corners and arcs of an outline from typed wall lengths, directions and arc radii.

  next = p + len × (cos θ, sin θ); arc chord = 2 r sin(|sweep| ÷ 2)

  Room outline, walls and openings addons/cabinetcraft/lib/room.js

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• Room outline from a host model, cleaned

  Drops repeated and in-line points from a room outline given by the host app and makes it counter-clockwise.

  drop b when |ab| < 1 or |(b − a) × (c − b)| < 1e-3 × max(1, |ab| × |bc|)

  Room outline, walls and openings addons/cabinetcraft/lib/fromroom.js

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• Host room moved to (0, 0) and rounded

  Shifts the host's outline so its lower-left corner is the origin and converts it to the job unit.

  mm job: round(v × 10) ÷ 10; inch job: round(v ÷ 25.4 × 16) ÷ 16

  Room outline, walls and openings addons/cabinetcraft/lib/fromroom.js

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• Host doors and windows onto the nearest wall

  Puts each door or window of the host model on the room wall nearest its middle, with its offset along that wall.

  s = (p − a)·u; off = |(p − a) × u|; at = clamp(s − w ÷ 2, 0, len − w)

  Room outline, walls and openings addons/cabinetcraft/lib/fromroom.js

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• Room point back in the host's axes

  Converts a point in the room's own axes to millimeters in the host model.

  X = ox + x × k, k = 25.4 for an inch job, else 1

  Room outline, walls and openings addons/cabinetcraft/lib/fromroom.js

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• Island frames

  The origin and axes of each island's front row and back row.

  u = (cos a, sin a), a = rot × π ÷ 180; back row origin = o + u × len

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• Layout tolerance and largest automatic filler

  The two limits the layout compares against.

  tol = 0.01; maxFiller = conv(75, unit)

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• End-face swing of a cabinet on a bay

  How far the end face of a straight cabinet on a curved bay swings toward the neighboring run.

  tilt = d × sin(atan2(w ÷ 2, √(r² − w² ÷ 4)))

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• Is a corner a right angle

  Decides whether a corner cabinet fits a room corner.

  square when |turn − 90| < 0.01 degrees

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• Where the later run stops at a corner

  How far short of a room corner a run stops so it clears the run on the other wall.

  stop = flat + tilt(A) + tilt(B) + flat² ÷ (2r); flat = other run's depth at 90°

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• Wedge filler triangle at an angled corner

  The three corners of the triangular void left where two runs meet at an angle that is not 90 degrees.

  tri = [corner, corner ± u × leg1, corner + n × depth]

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• Automatic filler width

  The width of the filler that closes the gap between the last cabinet and the end of the span.

  rest = end − start − used; filler = rest when tol < rest ≤ maxFiller

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• Position of each cell along its run

  The distance from the start of the wall to each cabinet, filler and end panel.

  xᵢ₊₁ = xᵢ + wᵢ; stored xᵢ rounded to 6 decimals

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• First cabinet on a curve moved clear of the previous run

  On a curved wall that starts at a room corner, how far the first cabinet is moved along so it does not overlap the previous run's last cabinet.

  bisection on [0, 600 mm], 40 halvings; clash when overlap > 1e-6

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• Straight countertop length and width

  The length and width of a countertop over a straight run of base cabinets.

  length = x₁ − x₀ + overhang at each open end; width = depth + front overhang + seat

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• Countertop on a curved wall

  The outline and area of a one-piece countertop that follows cabinets stepped along a curved wall.

  area = |Σ (xᵢ yᵢ₊₁ − xᵢ₊₁ yᵢ)| ÷ 2

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• Corner cabinet countertop

  The outline and area of the countertop over a corner cabinet.

  area = shoelace of the outline; length = width = √area

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• Extent of a cell along its wall

  The stretch of wall each cell covers, used to test it against doors and windows.

  curved wall: min and max of (corner − a)·u; straight: [x, x + w]

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• End panel height

  The height of an end panel beside a cabinet.

  height = cabinet height − kick height

  Cabinet run layout and countertops addons/cabinetcraft/lib/project.js

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• Wall frame to room coordinates

  Turns a distance along a wall and a distance out from it into a room point.

  p = o + u × s + n × o′

  Cabinet run layout and countertops addons/cabinetcraft/lib/footprint.js

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• Floor footprint of each cell

  The polygon each cabinet and end panel covers on the floor, its bounding box and its height range.

  Cabinet run layout and countertops addons/cabinetcraft/lib/footprint.js

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• How far two footprints overlap

  The penetration depth of two convex polygons, 0 when they are apart or only touch.

  for each edge normal n: overlap = min(a₁, b₁) − max(a₀, b₀) of the projections; result = smallest overlap

  Cabinet run layout and countertops addons/cabinetcraft/lib/footprint.js

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• Gap between two rectangles

  The distance between two axis-aligned rectangles.

  gap = √(dx² + dy²), dx and dy the clear distances on each axis, 0 when they overlap on it

  Cabinet run layout and countertops addons/cabinetcraft/lib/footprint.js

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• Gap between two sets of convex polygons

  The smallest distance between two footprints made of convex pieces, 0 when they touch or overlap.

  Cabinet run layout and countertops addons/cabinetcraft/lib/footprint.js

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• One cabinet in plan

  The cabinet seen from above in its own frame, with its fronts, number and width label.

  W = w × k; D = d × k; label = round(w × 100) ÷ 100

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/draw.js

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• Front view of a run

  Each cabinet's box, plinth and fronts along the run, x along the wall and y up from the floor.

  X = x × k; front at (X + f.x × k, base + f.y × k)

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/draw.js

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• Frame of a run from two wall points

  The origin, angle and length of a run picked by two points on a wall and a point in the room.

  len = √(Δx² + Δy²); left = (room − a) × u; ang = atan2(u_y, uₓ)

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/draw.js

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• Point in a run's frame

  The distance along a run and out from the wall of a point.

  s = Δx cos a + Δy sin a; off = −Δx sin a + Δy cos a

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/draw.js

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• Cabinet in section

  The side panel, bottom, top or rails, back, shelves, plinth, fronts and drawer boxes of a cabinet cut through its middle.

  shelf i of n: y = bottom + (top − bottom) × (i + 1) ÷ (n + 1) − t ÷ 2

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/draw.js

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• Drawing extent and SVG coordinates

  The size of a drawing and the coordinates written into its SVG.

  W = x₁ − x₀; H = y₁ − y₀; each coordinate written as round(v × 1e6) ÷ 1e6

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/drawings.js

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• Cabinets placed on the room plan

  The rectangle of each cabinet, filler and end panel in room coordinates.

  corner = toWorld(frame, s + x, o)

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/drawings.js

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• Room dimensions on the plan

  The overall width and depth dimensions of the room.

  label = fmtLen(W, unit)

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/drawings.js

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• Foreshortened width on a curved wall

  The drawn width of a cabinet that is turned on a curved wall, in the elevation.

  kₓ = max(0.05, (ext₁ − ext₀) ÷ w); drawn width = w × kₓ

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/drawings.js

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• Overall run length and height in the elevation

  The total length of a run and the height to the top of its tallest cabinet.

  length = b − a; top = max(elevation + height)

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/drawings.js

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• Section of one cabinet with dimensions

  The section view of one cabinet with its face frame, fronts, overall depth and height.

  depth shown = d + frame thickness + front thickness

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/drawings.js

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• Cabinet panels as boxes

  The carcass panels, back, shelves, plinth and fronts of a cabinet as boxes in its own frame.

  shelf i of n: z = bottom + (top − bottom) × (i + 1) ÷ (n + 1) − t ÷ 2

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/solid.js

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• Boxes placed in the drawing

  The faces of each box in drawing coordinates, for the 3D tab.

  X = x + lx cos r − ly sin r; Y = y + lx sin r + ly cos r; Z = (z + elev) × k

  Cabinet plan, elevation, section and 3D boxes addons/cabinetcraft/lib/solid.js

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• Numbers read from a G-code line

  Splits a line into its letter and number words.

  G-code dry run and hole check addons/cabinetcraft/lib/dryrun.js

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• Arc move length

  The length of a G2 or G3 move in the XY plane, with any Z change.

  r = |start − center|; sweep = a₁ − a₀ wrapped to the move's direction; len = √((r × |sweep|)² + Δz²)

  G-code dry run and hole check addons/cabinetcraft/lib/dryrun.js

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