Function pointToDataOnlyHeaderFillOut

src/coord/matrix/Matrix.ts:576–600

(
    ctx: CtxPointToData,
    partialOut: (OrdinalNumber | MatrixXYLocator)[],
    dimIdx: number,
    dims: MatrixDimPair,
)

// Assume partialOut has been set to NaN outside.
// This method may fill out[0] and out[1] in one call.
function pointToDataOnlyHeaderFillOut(
    ctx: CtxPointToData,
    partialOut: (OrdinalNumber | MatrixXYLocator)[],
    dimIdx: number,
    dims: MatrixDimPair,
): void {
    const otherDimIdx = 1 - dimIdx;

    if (ctx[XY[dimIdx]] === CtxPointToDataAreaType.outside) {
        return;
    }
    for (dims[XY[dimIdx]].resetCellIterator(_ptdDimCellIt); _ptdDimCellIt.next();) {
        const cell = _ptdDimCellIt.item;
        if (isCoordInRect(ctx.point[dimIdx], cell.rect, dimIdx)
            && isCoordInRect(ctx.point[otherDimIdx], cell.rect, otherDimIdx)
        ) {
            // non-leaves are also allowed to be located.
            // If the point is in x or y dimension cell area, should check both x and y coord to
            // determine a cell; in this way a non-leaf cell can be determined.
            partialOut[dimIdx] = cell.ordinal;
            partialOut[otherDimIdx] = cell.id[XY[otherDimIdx]];
            return;
        }
    }
}

// Assume partialOut has been set to NaN outside.
// This method may fill out[0] and out[1] in one call.