javascript - Dygraph.js - 当 x 为日期时获取图表的中心点

Question

如何在实际缩放尺寸下获取dygraphs中的中心点/数据？

当x轴是整数时很容易，但是当x轴是Date类型(Unix时间戳)时怎么办？

Answer 1

docs for xAxisRange说:

Returns the currently-visible x-range. This can be affected by zooming, panning or a call to updateOptions. Returns a two-element array: [left, right]. If the Dygraph has dates on the x-axis, these will be millis since epoch.

所以你应该能够做类似的事情:

var range = g.xAxisRange();
var midPointMs = 0.5 * (range[0] + range[1]);
var midPointDate = new Date(midPointMs);