Function opacity_

docs/app/js/sanddance-app.js:131573–131585

(opacity, _)

    return f;
} // get image opacity function
function opacity_(opacity, _) {
    let f;
    if ((0, _vegaUtil.isFunction)(opacity)) {
        f = (obj)=>opacity(obj, _);
        f.dep = dependency(opacity);
    } else if (opacity) f = (0, _vegaUtil.constant)(opacity);
    else {
        // default to [0, max] opacity gradient
        f = (obj)=>obj.$value / obj.$max || 0;
        f.dep = true;
    }
    return f;
} // check if function depends on individual pixel data
function dependency(f) {
    if (!(0, _vegaUtil.isFunction)(f)) return false;
    const set3 = (0, _vegaUtil.toSet)((0, _vegaUtil.accessorFields)(f));