Basically, I am trying to modify this example, but such that, in addition to the red line indicating the actual pointer position, I want another vertical line, a month after the red line.
Using a custom date adder,
function dateAdder(date, days) {
let d = new Date(d3.timeFormat("%Y-%m-%d")(date));
d.setDate(d.getDate() + days);
return d;
}
and adding the line
Plot.ruleX(aapl, Plot.pointerX({x: d => dateAdder(d.Date, 30), py: "Close", stroke: "blue"})),
to the marks argument doesn’t work. Any tips or ideas?
Ah this works! Thanks…! I guess I didn’t fully understand the difference between x and px…
In any case, I redesigned the dashboard to use a date slider with a restricted time window to both scroll the plot and to specify the reference position of the pointer, the latter which I used to generate a ruleX and two other marks.