Function normalizeDash

src/renderers/createReferenceLineRenderer.ts:116–147

(lineDash?: ReadonlyArray<number>)

};

const normalizeDash = (lineDash?: ReadonlyArray<number>): PackedDash => {
  if (!lineDash || lineDash.length === 0) {
    return { dashCount: 0, dashTotal: 0, values: new Array<number>(MAX_DASH_VALUES).fill(0) };
  }

  const cleaned: number[] = [];
  for (let i = 0; i < lineDash.length; i++) {
    const v = lineDash[i];
    if (typeof v === 'number' && Number.isFinite(v) && v > 0) cleaned.push(v);
  }

  if (cleaned.length === 0) {
    return { dashCount: 0, dashTotal: 0, values: new Array<number>(MAX_DASH_VALUES).fill(0) };
  }

  // CSS behavior: odd-length dash arrays are repeated to make even length.
  const normalized = cleaned.length % 2 === 1 ? cleaned.concat(cleaned) : cleaned;

  const dashCount = Math.min(MAX_DASH_VALUES, normalized.length);
  const values = new Array<number>(MAX_DASH_VALUES).fill(0);
  let dashTotal = 0;
  for (let i = 0; i < dashCount; i++) {
    values[i] = normalized[i];
    dashTotal += normalized[i];
  }

  if (!Number.isFinite(dashTotal) || dashTotal <= 0) {
    return { dashCount: 0, dashTotal: 0, values: new Array<number>(MAX_DASH_VALUES).fill(0) };
  }

  return { dashCount, dashTotal, values };
};

export function createReferenceLineRenderer(device: GPUDevice, options?: ReferenceLineRendererOptions): ReferenceLineRenderer {
  let disposed = false;