VlChartMark class

One mark and the channels it reads.

Every setter answers the mark, so a mark is written as one sentence.

aggregate, bin, title and the rest apply to the channel most recently named — the cursor — which is what makes that sentence read in the order it is thought. on moves the cursor back to a channel already set.

A channel names a column. A constant goes through valueNumber or valueString, and the two are kept apart on purpose: .color("red") meaning a column called red and .color("#c00") meaning paint it red cannot both be true, and the version that guesses is the one that draws a chart nobody asked for.

See also VlChart.

VlDataset data = VlDataset.create();
data.row().str("region", "North").num("sales", 120.0);
VlChart chart = VlChart.create(data);
chart.bar().x("region").y("sales").aggregate("sum").title("Total sales");