d3.interpolateCubehelixDefault(t) Given a number t in the range [0,1], returns the corresponding color from Green’s default Cubehelix represented as an RGB string.

d3.geoLength(feature) Returns the great-arc length of the specified GeoJSON feature in radians. For polygons, returns the perimeter of the exterior ring plus that of any interior rings.

d3.tile() Constructs a layout for determining which 256x256 quadtree tiles to display in a rectangular viewport. var tile = d3.tile();

d3.symbolStar The pentagonal star (pentagram) symbol type.

d3.zip(arrays…) Returns an array of arrays, where the ith array contains the ith element from each of the argument arrays. The returned array is truncated in length to the shortest array in arrays. If arrays contains only a single array, the returned array contains one-element arrays. With no arguments, the returned array is empty. d3.zip([1, 2], [3, 4]); // returns [[1, 3], [2, 4]]

simulation.on(typenames, [listener]) If listener is specified, sets the event listener for the specified typenames and returns this simulation. If an event listener was already registered for the same type and name, the existing listener is removed before the new listener is added. If listener is null, removes the current event listeners for the specified typenames, if any. If listener is not specified, returns the first currently-assigned listener matching the specified typenames, if any. W

d3.easeBack(t) d3.easeBackInOut(t) Symmetric anticipatory easing; scales backIn for t in [0, 0.5] and backOut for t in [0.5, 1].

d3.geoEckert2() d3.geoEckert2Raw The Eckert II projection.

identity.reflectY([reflect]) If reflect is specified, sets whether or not the y-dimension is reflected (negated) in the output. If reflect is not specified, returns true if y-reflection is enabled, which defaults to false. This is especially useful for transforming from standard spatial reference systems, which treat positive y as pointing up, to display coordinate systems such as Canvas and SVG, which treat positive y as pointing down.

d3.geoGraticule() Constructs a feature generator for creating graticules: a uniform grid of meridians and parallels for showing projection distortion. The default graticule has meridians and parallels every 10° between ±80° latitude; for the polar regions, there are meridians every 90°.