d3.randomUniform([min, ][max]) Returns a function for generating random numbers with a uniform distribution. The minimum allowed value of a returned number is min, and the maximum is max. If min is not specified, it defaults to 0; if max is not specified, it defaults to 1. For example: d3.randomUniform(6)(); // Returns a number greater than or equal to 0 and less than 6. d3.randomUniform(1, 5)(); // Returns a number greater than or equal to 1 and less than 5. Note that you can also use the bu

transition.attr(name, value) For each selected element, assigns the attribute tween for the attribute with the specified name to the specified target value. The starting value of the tween is the attribute’s value when the transition starts. The target value may be specified either as a constant or a function. If a function, it is immediately evaluated for each selected element, in order, being passed the current datum d and index i, with the this context as the current DOM element. If the t

diagram.links() Returns the Delaunay triangulation of the specified data array as an array of links, one for each edge in the mesh. Each link has the following attributes: source - the source node, an element in data. target - the target node, an element in data. Since the triangulation is computed as the dual of the Voronoi diagram, and the Voronoi diagram is clipped by the extent, a subset of the Delaunay links is returned.

quadtree.cover(x, y) Expands the quadtree to cover the specified point ⟨x,y⟩, and returns the quadtree. If the quadtree’s extent already covers the specified point, this method does nothing. If the quadtree has an extent, the extent is repeatedly doubled to cover the specified point, wrapping the root node as necessary; if the quadtree is empty, the extent is initialized to the extent [[⌊x⌋, ⌊y⌋], [⌈x⌉, ⌈y⌉]]. (Rounding is necessary such that if the extent is later doubled, the boundaries of

d3.axisTop(scale) Constructs a new top-oriented axis generator for the given scale, with empty tick arguments, a tick size of 6 and padding of 3. In this orientation, ticks are drawn above the horizontal domain path.

projection.rotate([angles]) If rotation is specified, sets the projection’s three-axis rotation to the specified angles, which must be a two- or three-element array of numbers [lambda, phi, gamma] specifying the rotation angles in degrees about each spherical axis. (These correspond to yaw, pitch and roll.) If the rotation angle gamma is omitted, it defaults to 0. See also d3.geoRotation. If rotation is not specified, returns the current rotation which defaults [0, 0, 0].

locale.formatPrefix(specifier, value) Equivalent to locale.format, except the returned function will convert values to the units of the appropriate SI prefix for the specified numeric reference value before formatting in fixed point notation. The following prefixes are supported: y - yocto, 10⁻²⁴ z - zepto, 10⁻²¹ a - atto, 10⁻¹⁸ f - femto, 10⁻¹⁵ p - pico, 10⁻¹² n - nano, 10⁻⁹ µ - micro, 10⁻⁶ m - milli, 10⁻³ ​ (none) - 10⁰ k - kilo, 10³ M - mega, 10⁶ G - giga, 10⁹ T - tera, 10¹²

d3.touches(container[, touches]) Returns the x and y coordinates of the touches associated with the current event relative to the specified container. The container may be an HTML or SVG container element, such as a G element or an SVG element. The coordinates are returned as an array of two-element arrays of numbers [[x1, y1], [x2, y2], …]. If touches is not specified, it defaults to the current event’s touches property.

d3.selectAll(selector) Selects all elements that match the specified selector string. The elements will be selected in document order (top-to-bottom). If no elements in the document match the selector, or if the selector is null or undefined, returns an empty selection. For example, to select all paragraphs: var paragraph = d3.selectAll("p"); If the selector is not a string, instead selects the specified array of nodes; this is useful if you already have a reference to nodes, such as this.chi

arc.cornerRadius([radius]) If radius is specified, sets the corner radius to the specified function or number and returns this arc generator. If radius is not specified, returns the current corner radius accessor, which defaults to: function cornerRadius() { return 0; } If the corner radius is greater than zero, the corners of the arc are rounded using circles of the given radius. For a circular sector, the two outer corners are rounded; for an annular sector, all four corners are rounded.