point.step() Returns the distance between the starts of adjacent points.

d3.chord() Constructs a new chord layout with the default settings.

map.get(key) Returns the value for the specified key string. If the map does not have an entry for the specified key, returns undefined.

d3.active(node[, name]) Returns the active transition on the specified node with the specified name, if any. If no name is specified, null is used. Returns null if there is no such active transition on the specified node. This method is useful for creating chained transitions. For example, to initiate disco mode: d3.selectAll("circle").transition() .delay(function(d, i) { return i * 50; }) .on("start", function repeat() { d3.active(this) .style("fill", "red")

d3.timeTuesdays(start, stop[, step]) d3.utcTuesdays(start, stop[, step]) Aliases for timeTuesday.range and utcTuesday.range.

point.bandwidth() Returns zero.

d3.timeDay d3.utcDay Days (e.g., February 7, 2012 at 12:00 AM); typically 24 hours. Days in local time may range from 23 to 25 hours due to daylight saving.

catmullRom.alpha(alpha) Returns a cubic Catmull–Rom curve with the specified alpha in the range [0, 1]. If alpha is zero, produces a uniform spline, equivalent to curveCardinal with a tension of zero; if alpha is one, produces a chordal spline; if alpha is 0.5, produces a centripetal spline. Centripetal splines are recommended to avoid self-intersections and overshoot. For example: var line = d3.line().curve(d3.curveCatmullRom.alpha(0.5));

d3.polygonLength(polygon) <> Returns the length of the perimeter of the specified polygon.

selection.text([value]) If a value is specified, sets the text content to the specified value on all selected elements, replacing any existing child elements. If the value is a constant, then all elements are given the same text content; otherwise, if the value is a function, then the function is evaluated for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with this as the current DOM element. The function’s return v