Function layOutRectOneDimBasedOnUnit

src/coord/matrix/Matrix.ts:436–451

(
    outRect: RectLike, dimIdx: number, id: Point, span: Point, dims: MatrixDimPair
)

// Save to rect for rendering.
function layOutRectOneDimBasedOnUnit(
    outRect: RectLike, dimIdx: number, id: Point, span: Point, dims: MatrixDimPair
): void {
    outRect[WH[dimIdx]] = 0;
    const locator = id[XY[dimIdx]];
    const dim = locator < 0 ? dims[XY[1 - dimIdx]] : dims[XY[dimIdx]];
    const layoutUnit = dim.getUnitLayoutInfo(dimIdx, id[XY[dimIdx]]);
    outRect[XY[dimIdx]] = layoutUnit.xy;
    outRect[WH[dimIdx]] = layoutUnit.wh;

    if (span[XY[dimIdx]] > 1) {
        const layoutUnit2 = dim.getUnitLayoutInfo(dimIdx, id[XY[dimIdx]] + span[XY[dimIdx]] - 1);
        // Be careful the cumulative error - cell must be aligned.
        outRect[WH[dimIdx]] = layoutUnit2.xy + layoutUnit2.wh - layoutUnit.xy;
    }
}

/**
 * Return NaN if not defined or invalid.