Function addScales

docs/app/js/sanddance-app.js:3058–3061

(scope, ...scale)

    scope.marks.push(...marks);
}
function addScales(scope, ...scale) {
    if (!scope.scales) scope.scales = [];
    scope.scales.push(...scale.filter(Boolean));
}
function addSignals(scope, ...signal) {
    if (!scope.signals) scope.signals = [];
    scope.signals.push(...signal);