Function sizeExpression

docs/tests/v2/es6/js/sanddance.js:136212–136217

(spec, scope, marks)

}

function sizeExpression(spec, scope, marks) {
  var size = (0, _util.deref)(getChannel('size', spec, marks)),
      strokeWidth = (0, _util.deref)(getChannel('strokeWidth', spec, marks)),
      fontSize = (0, _util.deref)(getFontSize(marks[1].encode, scope, _constants.GuideLabelStyle));
  return (0, _expression.default)(`max(ceil(sqrt(${size})+${strokeWidth}),${fontSize})`, scope);
}

function getChannel(name, spec, marks) {
  return spec[name] ? `scale("${spec[name]}",datum)` : (0, _guideUtil.getEncoding)(name, marks[0].encode);