Function createOrUpdatePatternFromDecal

src/util/decal.ts:51–306

(
    decalObject: InnerDecalObject | 'none',
    api: ExtensionAPI
)

 * @return {Pattern} pattern with generated image, null if no decal
 */
export function createOrUpdatePatternFromDecal(
    decalObject: InnerDecalObject | 'none',
    api: ExtensionAPI
): PatternObject {
    if (decalObject === 'none') {
        return null;
    }

    const dpr = api.getDevicePixelRatio();
    const zr = api.getZr();
    const isSVG = zr.painter.type === 'svg';

    if (decalObject.dirty) {
        decalMap.delete(decalObject);
    }

    const oldPattern = decalMap.get(decalObject);
    if (oldPattern) {
        return oldPattern;
    }

    const decalOpt = defaults(decalObject, {
        symbol: 'rect',
        symbolSize: 1,
        symbolKeepAspect: true,
        color: 'rgba(0, 0, 0, 0.2)',
        backgroundColor: null,
        dashArrayX: 5,
        dashArrayY: 5,
        rotation: 0,
        maxTileWidth: 512,
        maxTileHeight: 512
    } as DecalObject);
    if (decalOpt.backgroundColor === 'none') {
        decalOpt.backgroundColor = null;
    }

    const pattern: PatternObject = { repeat: 'repeat' } as PatternObject;
    setPatternnSource(pattern);
    pattern.rotation = decalOpt.rotation;
    pattern.scaleX = pattern.scaleY = isSVG ? 1 : 1 / dpr;

    decalMap.set(decalObject, pattern);

    decalObject.dirty = false;

    return pattern;

    function setPatternnSource(pattern: PatternObject) {
        const keys = [dpr];
        let isValidKey = true;
        for (let i = 0; i < decalKeys.length; ++i) {
            const value = (decalOpt as any)[decalKeys[i]];
            if (value != null
                && !isArray(value)
                && !isString(value)
                && !isNumber(value)
                && typeof value !== 'boolean'