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Same-row belt feed into an uphill low end draws as two capped ends (t67)

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
44r0n7
2026-10-27 14:30:02 -04:00
co-authored by Claude Opus 5.5
parent 45538cc18e
commit 02e338a46f
7 changed files with 45 additions and 44 deletions
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src/render/slope-belts.js
+17 -15
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@@ -7,16 +7,26 @@ function slopeBeltConnections(bx, by, code, planned = null) {
const join = endJoin(bx, by, end, planned);
if (join < 0) continue;
const nb = join >> 1, next = planned && planned.get(nb);
const slope = isSlopeBelt(next ? next[0] : blockP[nb]) &&
((nb / BW) | 0) - by === beltGrade(code) * (nb % BW - bx);
const pcode = next ? next[0] : blockP[nb];
const slope = isSlopeBelt(pcode) && ((nb / BW) | 0) - by === beltGrade(code) * (nb % BW - bx);
// A same-row feed into a low end drops onto its face: drawn as two capped ends, still joined.
if (!slope && beltDrop(nb, by, beltGrade(code) * (end ? 1 : -1) > 0, pcode, join & 1)) continue;
joins |= (slope ? 4 : 1) << end;
if (!slope && beltGrade(code) * (end ? 1 : -1) > 0 &&
((nb / BW) | 0) === by) joins |= 128; // low-end feed drops from the same-row flat
}
return joins;
}
// Does a same-row join between a piece in row `by` and block nb meet a slope's low end?
function beltDrop(nb, by, ownLow, pcode, pend) {
return ((nb / BW) | 0) === by && (ownLow || beltGrade(pcode) * (pend ? 1 : -1) > 0);
}
function flatBeltCaps(b, planned = null) {
return 3 ^ pieceJoins(b % BW, (b / BW) | 0, planned);
const bx = b % BW, by = (b / BW) | 0;
let caps = 0;
for (let end = 0; end < 2; end++) {
const join = endJoin(bx, by, end, planned), nb = join >> 1, next = planned && planned.get(nb);
if (join < 0 || beltDrop(nb, by, false, next ? next[0] : blockP[nb], join & 1)) caps |= 1 << end;
}
return caps;
}
function prepareSlopeBelts(x0, y0, x1, y1) {
if (slopeBeltJoins.length !== NB) { slopeBeltJoins = new Uint8Array(NB); slopeBeltHalo = new Uint8Array(NB); beltCaps = new Uint8Array(NB); }
@@ -60,19 +70,11 @@ function slopeBeltShape(x, y, b, joins = slopeBeltJoins[b], code = blockP[b]) {
const origin = (ox + grade * oy) * Math.SQRT1_2;
slopeBeltSegment(x, y, ax, ay, bx, by, origin + (ax + grade * ay) * Math.SQRT1_2);
if (joins & 1) {
if ((joins & 128) && grade < 0) {
slopeBeltSegment(x, y, -2, 2, 0, 2, ox - 2);
slopeBeltSegment(x, y, 0, 2, 0, ay, ox);
slopeBeltSegment(x, y, 0, ay, ax, ay, ox);
} else slopeBeltSegment(x, y, -2, ay, ax, ay, ox - 2);
slopeBeltSegment(x, y, -2, ay, ax, ay, ox - 2);
slopeBeltCorner(x, y, ax, ay, ox + ax);
}
if (joins & 2) {
if ((joins & 128) && grade > 0) {
slopeBeltSegment(x, y, bx, by, 4, by, ox + bx);
slopeBeltSegment(x, y, 4, by, 4, 2, ox + 4);
slopeBeltSegment(x, y, 4, 2, 6, 2, ox + 4);
} else slopeBeltSegment(x, y, bx, by, 6, by, ox + bx);
slopeBeltSegment(x, y, bx, by, 6, by, ox + bx);
slopeBeltCorner(x, y, bx, by, ox + bx);
}
return slopeDistance;