| 407 | } |
| 408 | |
| 409 | export function bucketStackedXKey( |
| 410 | xCenterPx: number, |
| 411 | categoryWidthPx: number, |
| 412 | xDomain: number, |
| 413 | categoryStep: number, |
| 414 | ): number { |
| 415 | // Match renderer intent: |
| 416 | // - Prefer bucketing in *range-space* to avoid float-equality issues in domain-x. |
| 417 | // - Requirement: Math.round(xCenterPx / categoryWidthPx) (grid-local). |
| 418 | if (Number.isFinite(categoryWidthPx) && categoryWidthPx > 0 && Number.isFinite(xCenterPx)) { |
| 419 | return Math.round(xCenterPx / categoryWidthPx); |
| 420 | } |
| 421 | if (Number.isFinite(categoryStep) && categoryStep > 0 && Number.isFinite(xDomain)) { |
| 422 | return Math.round(xDomain / categoryStep); |
| 423 | } |
| 424 | return Math.round(xDomain * 1e6); |
| 425 | } |
| 426 | |
| 427 | const lowerBoundTuple = ( |
| 428 | data: ReadonlyArray<TuplePoint>, |