Function normalizeDashArrayX

src/util/decal.ts:351–394

* Convert dash input into dashArray * * @param {DecalDashArrayX} dash dash input * @return {number[][]} normolized dash array

(dash: DecalDashArrayX)

 * @return {number[][]} normolized dash array
 */
function normalizeDashArrayX(dash: DecalDashArrayX): number[][] {
    if (!dash || (dash as number[]).length === 0) {
        return [[0, 0]];
    }
    if (isNumber(dash)) {
        const dashValue = Math.ceil(dash);
        return [[dashValue, dashValue]];
    }

    /**
     * [20, 5] should be normalized into [[20, 5]],
     * while [20, [5, 10]] should be normalized into [[20, 20], [5, 10]]
     */
    let isAllNumber = true;
    for (let i = 0; i < dash.length; ++i) {
        if (!isNumber(dash[i])) {
            isAllNumber = false;
            break;
        }
    }
    if (isAllNumber) {
        return normalizeDashArrayX([dash as number[]]);
    }

    const result: number[][] = [];
    for (let i = 0; i < dash.length; ++i) {
        if (isNumber(dash[i])) {
            const dashValue = Math.ceil(dash[i] as number);
            result.push([dashValue, dashValue]);
        }
        else {
            const dashValue = map(dash[i] as number[], n => Math.ceil(n));
            if (dashValue.length % 2 === 1) {
                // [4, 2, 1] means |----  -    -- |----  -    -- |
                // so normalize it to be [4, 2, 1, 4, 2, 1]
                result.push(dashValue.concat(dashValue));
            }
            else {
                result.push(dashValue);
            }
        }
    }
    return result;
}

/**
 * Convert dash input into dashArray