area.x0([x]) If x is specified, sets the x0 accessor to the specified function or number and returns this area generator. If x is not specified, returns the current x0 accessor, which defaults to: function x(d) { return d[0]; } When an area is generated, the x0 accessor will be invoked for each defined element in the input data array, being passed the element d, the index i, and the array data as three arguments. The default x0 accessor assumes that the input data are two-element arrays of

area.y1([y]) If y is specified, sets the y1 accessor to the specified function or number and returns this area generator. If y is not specified, returns the current y1 accessor, which defaults to: function y(d) { return d[1]; } A null accessor is also allowed, indicating that the previously-computed y0 value should be reused for the y1 value. When an area is generated, the y1 accessor will be invoked for each defined element in the input data array, being passed the element d, the index i,

d3.geoBounds(feature) Returns the spherical bounding box for the specified GeoJSON feature. The bounding box is represented by a two-dimensional array: [[left, bottom], [right, top]], where left is the minimum longitude, bottom is the minimum latitude, right is maximum longitude, and top is the maximum latitude. All coordinates are given in degrees. (Note that in projected planar coordinates, the minimum latitude is typically the maximum y-value, and the maximum latitude is typically the mini

d3.sum(array[, accessor]) Returns the sum of the given array of numbers. If the array is empty, returns 0. An optional accessor function may be specified, which is equivalent to calling array.map(accessor) before computing the sum. This method ignores undefined and NaN values; this is useful for ignoring missing data.

tree.size([size]) If size is specified, sets this tree layout’s size to the specified two-element array of numbers [width, height] and returns this tree layout. If size is not specified, returns the current layout size, which defaults to [1, 1]. A layout size of null indicates that a node size will be used instead. The coordinates x and y represent an arbitrary coordinate system; for example, to produce a radial layout, a size of [360, radius] corresponds to a breadth of 360° and a depth of

arc.innerRadius([radius]) If radius is specified, sets the inner radius to the specified function or number and returns this arc generator. If radius is not specified, returns the current inner radius accessor, which defaults to: function innerRadius(d) { return d.innerRadius; } Specifying the inner radius as a function is useful for constructing a stacked polar bar chart, often in conjunction with a sqrt scale. More commonly, a constant inner radius is used for a donut or pie chart. If th

d3.geoGinzburg8() d3.geoGinzburg8Raw The Ginzburg VIII projection.

dsv.formatRows(rows) Formats the specified array of array of string rows as delimiter-separated values, returning a string. This operation is the reverse of dsv.parseRows. Each row will be separated by a newline (\n), and each column within each row will be separated by the delimiter (such as a comma, ,). Values that contain either the delimiter, a double-quote (") or a newline will be escaped using double-quotes. To convert an array of objects to an array of arrays while explicitly specifyi

transition.ease([value]) Specifies the transition easing function for all selected elements. The value must be specified as a function. The easing function is invoked for each frame of the animation, being passed the normalized time t in the range [0, 1]; it must then return the eased time tʹ which is typically also in the range [0, 1]. A good easing function should return 0 if t = 0 and 1 if t = 1. If an easing function is not specified, it defaults to d3.easeCubic. If a value is not specif

d3.geoLaskowski() d3.geoLaskowskiRaw The Laskowski tri-optimal projection simultaneously minimizes distance, angular, and areal distortion.