private Action chooseBivariate(Field x, Field y) {
// Dates need line charts
if (x.isDate() && !y.isDate() && !y.preferCategorical()) return makeLineChart(x, y);
if (y.isDate() && !x.isDate() && !x.preferCategorical()) return makeLineChart(y, x);
// Heatmaps if either is categorical
if (x.preferCategorical() || y.preferCategorical())
return get("heatmap").apply(orderByCoarseness(x, y));
// Default to scatter
return get("scatter").apply(orderByCoarseness(x, y));
}
private boolean goodForWordle(Field f) {
if (!f.preferCategorical()) return false;
if (f.numericProperty("unique") > 100 || f.numericProperty("unique") < 7) return false;
// Too long names are not good
for (Object c : f.categories()) if (c.toString().length() > 20) return false;
return true;
}