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Shared drag placement; drags snap one block to join a diagonal (t67 phases 3-4)

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
44r0n7
2026-10-27 15:08:37 -04:00
co-authored by Claude Opus 5.5
parent c3f9387b24
commit 72efe85a1b
8 changed files with 97 additions and 20 deletions
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src/ui/selection.js
+11
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@@ -87,6 +87,17 @@ function pieceV(P) {
if (P.filter) return filterVariant(pieceCode(P), (GAME.pieceDir[P.id] || 0) << 7);
return GAME.pieceDir[P.id] || 0;
}
// One drag for the build tool and its preview: code, direction, variant, blocks, and the planned
// blocks the join rule sees. A line that joins one block up or down snaps there (joinSnap).
function dragPlan(P, a, b, shift) {
const code = pieceCode(P, b), dd = a ? dragDirFor(P, a, b) : -1, dir = dd >= 0 ? dd : (GAME.pieceDir[P.id] || 0);
const v = isWall(P.code) ? GAME.wallMat : P.filter ? filterVariant(code, dir << 7) : dir;
let cells = !a ? [[b.bx, b.by]] : shift && !lineOnly(code) ? blockRect(a.bx, a.by, b.bx, b.by)
: blockLine(a.bx, a.by, b.bx, b.by, isWall(code) || isSlopeBelt(code) || code === BP_SCREW);
const snap = lineOnly(code) ? joinSnap(code, v, cells) : 0;
if (snap) cells = cells.map(([x, y]) => [x, y + snap]);
return { code, dd, dir, v, cells, snap, planned: new Map(cells.map(([x, y]) => [y * BW + x, [code, v]])) };
}
function pieceExtra(P) { return P.filter ? { m: GAME.filterCfg.m.slice(), inv: GAME.filterCfg.inv } : undefined; }
function filterBlockAt(x, y) { if (x < 0 || y < 0 || x >= W || y >= H) return -1; const b = ((y / BS) | 0) * BW + ((x / BS) | 0); return isFilter(blockP[b]) ? b : -1; }
function chipCost(cost) { const ok = canAfford(cost, 1); return `<span class="chip ${ok ? 'ok' : 'bad'}">${esc(costText(cost, 1))}</span>`; }