graticule.stepMajor([step]) If step is specified, sets the major step for this graticule. If step is not specified, returns the current major step, which defaults to ⟨90°, 360°⟩.

map.empty() Returns true if and only if this map has zero entries.

d3.symbolWye The Y-shape symbol type.

radialArea.context([context]) Equivalent to line.context.

d3.interpolateBasisClosed(values) Returns a uniform nonrational B-spline interpolator through the specified array of values, which must be numbers. The control points are implicitly repeated such that the resulting one-dimensional spline has cyclical C² continuity when repeated around t in [0,1]. See also d3.curveBasisClosed.

d3.geoGinzburg5() d3.geoGinzburg5Raw The Ginzburg V projection.

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")