point.align([align]) If align is specified, sets the alignment to the specified value which must be in the range [0, 1]. If align is not specified, returns the current alignment which defaults to 0.5. The alignment determines how any leftover unused space in the range is distributed. A value of 0.5 indicates that the leftover space should be equally distributed before the first point and after the last point; i.e., the points should be centered within the range. A value of 0 or 1 may be used t

arc(arguments…) Generates an arc for the given arguments. The arguments are arbitrary; they are simply propagated to the arc generator’s accessor functions along with the this object. For example, with the default settings, an object with radii and angles is expected: var arc = d3.arc(); arc({ innerRadius: 0, outerRadius: 100, startAngle: 0, endAngle: Math.PI / 2 }); // "M0,-100A100,100,0,0,1,100,0L0,0Z" If the radii and angles are instead defined as constants, you can generate an a

d3.event The current event, if any. This is set during the invocation of an event listener, and is reset after the listener terminates. Use this to access standard event fields such as event.timeStamp and methods such as event.preventDefault. While you can use the native event.pageX and event.pageY, it is often more convenient to transform the event position to the local coordinate system of the container that received the event using d3.mouse, d3.touch or d3.touches. If you use Babel, Webpack

d3.geoTransverseMercator() d3.geoTransverseMercatorRaw The transverse spherical Mercator projection. Defines a default projection.clipExtent such that the world is projected to a square, clipped to approximately ±85° latitude.

locale.format(specifier) Returns a new formatter for the given string specifier. The specifier string may contain the following directives: %a - abbreviated weekday name.* %A - full weekday name.* %b - abbreviated month name.* %B - full month name.* %c - the locale’s date and time, such as %x, %X.* %d - zero-padded day of the month as a decimal number [01,31]. %e - space-padded day of the month as a decimal number [ 1,31]; equivalent to %_d. %H - hour (24-hour clock) as a decimal num

d3.geoProjection(project) Constructs a new projection from the specified raw projection, project. The project function takes the longitude and latitude of a given point in radians, often referred to as lambda (λ) and phi (φ), and returns a two-element array [x, y] representing its unit projection. The project function does not need to scale or translate the point, as these are applied automatically by projection.scale, projection.translate, and projection.center. Likewise, the project functio

transition.filter(filter) For each selected element, selects only the elements that match the specified filter, and returns a transition on the resulting selection. The filter may be specified either as a selector string or a function. If a function, it is 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. The new transition has the same id, name and timing as this transition; however, if a transition

transition.text(value) For each selected element, sets the text content to the specified target value when the transition starts. The 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. The function’s return value is then used to set each element’s text content. A null value will clear the content. To interpolat

d3.median(array[, accessor]) Returns the median of the given array of numbers using the R-7 method. If the array is empty, returns undefined. An optional accessor function may be specified, which is equivalent to calling array.map(accessor) before computing the median. This method ignores undefined and NaN values; this is useful for ignoring missing data.

selection.interrupt([name]) Interrupts the active transition of the specified name on the selected elements, and cancels any pending transitions with the specified name, if any. If a name is not specified, null is used. Interrupting a transition on an element has no effect on any transitions on any descendant elements. For example, an axis transition consists of multiple independent, synchronized transitions on the descendants of the axis G element (the tick lines, the tick labels, the domai