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D3: Data-Driven Documents

This branch contains the prerelease of D3 4.0. This API is unstable and may change at any point prior to the release.

Installing

If you use NPM, npm install d3@next. Otherwise, download the latest release. The released bundle supports AMD, CommonJS, and vanilla environments. Create a custom build using Rollup or your preferred bundler. You can also load directly from d3js.org:

<script src="https://d3js.org/d3.v4.0.0-alpha.24.min.js"></script>

API Reference

Arrays (Statistics, Histograms, Search, Transformations)
Axes
Collections (Objects, Maps, Sets, Nests)
Colors
Delimiter-Separated Values
Dispatches
Easings
Interpolators
Number Formats
Paths
Polygons
Quadtrees
Queues
Random Numbers
Requests
Scales (Continuous, Sequential, Quantize, Ordinal, Categorical)
Selections (Selecting, Modifying, Data, Events, Control, Namespaces)
Shapes (Arcs, Pies, Lines, Areas, Curves, Symbols, Stacks)
Time Formats
Time Intervals
Timers
Transitions
Voronoi Diagrams

D3 uses semantic versioning. The current version is exposed as d3.version.

Arrays

Array manipulation, ordering, searching, summarizing, etc.

Statistics

Methods for computing basic summary statistics.

d3.min - compute the minimum value in an array.
d3.max - compute the maximum value in an array.
d3.extent - compute the minimum and maximum value in an array.
d3.sum - compute the sum of an array of numbers.
d3.mean - compute the arithmetic mean of an array of numbers.
d3.median - compute the median of an array of numbers (the 0.5-quantile).
d3.quantile - compute a quantile for a sorted array of numbers.
d3.variance - compute the variance of an array of numbers.
d3.deviation - compute the standard deviation of an array of numbers.

Histograms

Bin discrete samples into continuous, non-overlapping intervals.

d3.histogram - create a new histogram generator.
histogram - compute the histogram for the given array of samples.
histogram.value - specify a value accessor for each sample.
histogram.domain - specify the interval of observable values.
histogram.thresholds - specify how values are divided into bins.
d3.thresholdFreedmanDiaconis - the Freedman–Diaconis binning rule.
d3.thresholdScott - Scott’s normal reference binning rule.
d3.thresholdSturges - Sturges’ binning formula.

Search

Methods for searching arrays for a specific element.

d3.scan - linear search for an element using a comparator.
d3.bisect - binary search for a value in a sorted array.
d3.bisectRight - binary search for a value in a sorted array.
d3.bisectLeft - binary search for a value in a sorted array.
d3.bisector - bisect using an accessor or comparator.
bisector.left - bisectLeft, with the given comparator.
bisector.right - bisectRight, with the given comparator.
d3.ascending - compute the natural order of two values.
d3.descending - compute the natural order of two values.

Transformations

Methods for transforming arrays and for generating new arrays.

d3.merge - merge multiple arrays into one array.
d3.pairs - create an array of adjacent pairs of elements.
d3.permute - reorder an array of elements according to an array of indexes.
d3.shuffle - randomize the order of an array.
d3.ticks - generate representative values from a numeric interval.
d3.tickStep - generate representative values from a numeric interval.
d3.range - generate a range of numeric values.
d3.transpose - transpose an array of arrays.
d3.zip - transpose a variable number of arrays.

Axes

Human-readable reference marks for scales.

d3.axisTop - create a new top-oriented axis generator.
d3.axisRight - create a new right-oriented axis generator.
d3.axisBottom - create a new bottom-oriented axis generator.
d3.axisLeft - create a new left-oriented axis generator.
axis - generate an axis for the given selection.
axis.scale - set the scale.
axis.ticks - customize how ticks are generated and formatted.
axis.tickArguments - customize how ticks are generated and formatted.
axis.tickValues - set the tick values explicitly.
axis.tickFormat - set the tick format explicitly.
axis.tickSize - set the size of the ticks.
axis.tickSizeInner - set the size of inner ticks.
axis.tickSizeOuter - set the size of outer (extent) ticks.
axis.tickPadding - set the padding between ticks and labels.

Collections

Handy data structures for elements keyed by string.

Objects

Methods for converting associative arrays (objects) to arrays.

d3.keys - list the keys of an associative array.
d3.values - list the values of an associated array.
d3.entries - list the key-value entries of an associative array.

Maps

Like ES6 Map, but with string keys and a few other differences.

d3.map - create a new, empty map.
map.has - returns true if the map contains the given key.
map.get - get the value for the given key.
map.set - set the value for the given key.
map.remove - remove the entry for given key.
map.clear - remove all entries.
map.keys - get the array of keys.
map.values - get the array of values.
map.entries - get the array of entries (key-values objects).
map.each - call a function for each entry.
map.empty - returns false if the map has at least one entry.
map.size - compute the number of entries.

Sets

Like ES6 Set, but with string keys and a few other differences.

d3.set - create a new, empty set.
set.has - returns true if the set contains the given value.
set.add - add the given value.
set.remove - remove the given value.
set.clear - remove all values.
set.values - get the array of values.
set.each - call a function for each value.
set.empty - returns true if the set has at least one value.
set.size - compute the number of values.

Nests

Group data into arbitrary hierarchies.

d3.nest - create a new nest generator.
nest.key - add a level to the nest hierarchy.
nest.sortKeys - sort the current nest level by key.
nest.sortValues - sort the leaf nest level by value.
nest.rollup - specify a rollup function for leaf values.
nest.map - generate the nest, returning a map.
nest.object - generate the nest, returning an associative array.
nest.entries - generate the nest, returning an array of key-values tuples.

Colors

Color manipulation and color space conversion.

d3.color - parse the given CSS color specifier.
color.rgb - compute the RGB equivalent of this color.
color.brighter - create a brighter copy of this color.
color.darker - create a darker copy of this color.
color.displayable - returns true if the color is displayable on standard hardware.
color.toString - format the color as an RGB hexadecimal string.
d3.rgb - create a new RGB color.
d3.hsl - create a new HSL color.
d3.lab - create a new Lab color.
d3.hcl - create a new HCL color.
d3.cubehelix - create a new Cubehelix color.

Delimiter-Separated Values

Parse and format delimiter-separated values, most commonly CSV and TSV.

d3.dsvFormat - create a new parser and formatter for the given delimiter.
dsv.parse - parse the given string, returning an array of objects.
dsv.parseRows - parse the given string, returning an array of rows.
dsv.format - format the given array of objects.
dsv.formatRows - format the given array of rows.
d3.csvParse - parse the given CSV string, returning an array of objects.
d3.csvParseRows - parse the given CSV string, returning an array of rows.
d3.csvFormat - format the given array of objects as CSV.
d3.csvFormatRows - format the given array of rows as CSV.
d3.tsvParse - parse the given TSV string, returning an array of objects.
d3.tsvParseRows - parse the given TSV string, returning an array of rows.
d3.tsvFormat - format the given array of objects as TSV.
d3.tsvFormatRows - format the given array of rows as TSV.

Dispatches

Separate concerns using named callbacks.

d3.dispatch - create a custom event dispatcher.
dispatch.on - register or unregister an event listener.
dispatch.copy - create a copy of a dispatcher.
dispatch.call - dispatch an event to registered listeners.
dispatch.apply - dispatch an event to registered listeners.

Easings

Easing functions for smooth animation.

ease - ease the given normalized time.
d3.easeLinear - linear easing; the identity function.
d3.easePolyIn - polynomial easing; raises time to the given power.
d3.easePolyOut - reverse polynomial easing.
d3.easePolyInOut - symmetric polynomial easing.
poly.exponent - specify the polynomial exponent.
d3.easeQuad - an alias for easeQuadInOut.
d3.easeQuadIn - quadratic easing; squares time.
d3.easeQuadOut - reverse quadratic easing.
d3.easeQuadInOut - symmetric quadratic easing.
d3.easeCubic - an alias for easeCubicInOut.
d3.easeCubicIn - cubic easing; cubes time.
d3.easeCubicOut - reverse cubic easing.
d3.easeCubicInOut - symmetric cubic easing.
d3.easeSin - an alias for easeSinInOut.
d3.easeSinIn - sinusoidal easing.
d3.easeSinOut - reverse sinusoidal easing.
d3.easeSinInOut - symmetric sinusoidal easing.
d3.easeExp - an alias for easeExpInOut.
d3.easeExpIn - exponential easing.
d3.easeExpOut - reverse exponential easing.
d3.easeExpInOut - symmetric exponential easing.
d3.easeCircle - an alias for easeCircleInOut.
d3.easeCircleIn - circular easing.
d3.easeCircleOut - reverse circular easing.
d3.easeCircleInOut - symmetric circular easing.
d3.easeElastic - an alias for easeElasticOut.
d3.easeElasticIn - elastic easing, like a rubber band.
d3.easeElasticOut - reverse elastic easing.
d3.easeElasticInOut - symmetric elastic easing.
elastic.amplitude - specify the elastic amplitude.
elastic.period - specify the elastic period.
d3.easeBack - an alias for easeBackInOut.
d3.easeBackIn - anticipatory easing, like a dancer bending his knees before jumping.
d3.easeBackOut - reverse anticipatory easing.
d3.easeBackInOut - symmetric anticipatory easing.
back.overshoot - specify the amount of overshoot.
d3.easeBounce - an alias for easeBounceOut.
d3.easeBounceIn - bounce easing, like a rubber ball.
d3.easeBounceOut - reverse bounce easing.
d3.easeBounceInOut - symmetric bounce easing.

Interpolators

Interpolate numbers, colors, strings, arrays, objects, whatever!

d3.interpolate - interpolate arbitrary values.
d3.interpolateArray - interpolate arrays of arbitrary values.
d3.interpolateNumber - interpolate numbers.
d3.interpolateObject - interpolate arbitrary objects.
d3.interpolateRound - interpolate integers.
d3.interpolateString - interpolate strings with embedded numbers.
d3.interpolateTransformCss - interpolate 2D CSS transforms.
d3.interpolateTransformSvg - interpolate 2D SVG transforms.
d3.interpolateZoom - zoom and pan between two views.
d3.interpolateRgb - interpolate RGB colors.
d3.interpolateHsl - interpolate HSL colors.
d3.interpolateHslLong - interpolate HSL colors, the long way.
d3.interpolateLab - interpolate Lab colors.
d3.interpolateHcl - interpolate HCL colors.
d3.interpolateHclLong - interpolate HCL colors, the long way.
d3.interpolateCubehelix - interpolate Cubehelix colors.
d3.interpolateCubehelixLong - interpolate Cubehelix colors, the long way.
interpolate.gamma - apply gamma correction during interpolation.

Number Formats

Format numbers for human consumption.

d3.format - alias for enUs.format.
d3.formatPrefix - alias for enUs.formatPrefix.
d3.formatSpecifier - parse a number format specifier.
d3.formatLocale - define a custom locale.
locale.format - create a number format.
locale.formatPrefix - create a SI-prefix number format.
d3.formatCaEs - the Catalan (Spain) locale.
d3.formatCsCz - the Czech (Czech Republic) locale.
d3.formatDeCh - the German (Switzerland) locale.
d3.formatDeDe - the German (Germany) locale.
d3.formatEnCa - the English (Canada) locale.
d3.formatEnGb - the English (United Kingdom) locale.
d3.formatEnUs - the English (United States) locale.
d3.formatEsEs - the Spanish (Spain) locale.
d3.formatFiFi - the Finnish (Finland) locale.
d3.formatFrCa - the French (Canada) locale.
d3.formatFrFr - the French (France) locale.
d3.formatHeIl - the Hebrew (Israel) locale.
d3.formatHuHu - the Hungarian (Hungary) locale.
d3.formatItIt - the Italian (Italy) locale.
d3.formatJaJp - the Japanese (Japan) locale.
d3.formatKoKr - the Korean (South Korea) locale.
d3.formatMkMk - the Macedonian (Macedonia) locale.
d3.formatNlNl - the Dutch (Netherlands) locale.
d3.formatPlPl - the Polish (Poland) locale.
d3.formatPtBr - the Portuguese (Brazil) locale.
d3.formatRuRu - the Russian (Russia) locale.
d3.formatSvSe - the Swedish (Sweden) locale.
d3.formatZhCn - the Chinese (China) locale.
d3.precisionFixed - compute decimal precision for fixed-point notation.
d3.precisionPrefix - compute decimal precision for SI-prefix notation.
d3.precisionRound - compute significant digits for rounded notation.

Paths

Serialize Canvas path commands to SVG.

d3.path - create a new path serializer.
path.moveTo - move to the given point.
path.closePath - close the current subpath.
path.lineTo - draw a straight line segment.
path.quadraticCurveTo - draw a quadratic Bézier segment.
path.bezierCurveTo - draw a cubic Bézier segment.
path.arcTo - draw a circular arc segment.
path.arc - draw a circular arc segment.
path.rect - draw a rectangle.
path.toString - serialize to an SVG path data string.

Polygons

Geometric operations for two-dimensional polygons.

d3.polygonArea - compute the area of the given polygon.
d3.polygonCentroid - compute the centroid of the given polygon.
d3.polygonHull - compute the convex hull of the given points.
d3.polygonContains - test whether a point is inside a polygon.
d3.polygonLength - compute the length of the given polygon’s perimeter.

Quadtrees

Two-dimensional recursive spatial subdivision.

d3.quadtree - create a new quadtree generator.
quadtree - generate a quadtree for the specified points.
root.add - add a point to a quadtree.
root.find - quickly find the closest point in a quadtree.
root.visit - recursively visit all nodes in a quadtree.
quadtree.x - set the x accessor.
quadtree.y - set the y accessor.
quadtree.extent - set the observed extent of points.
quadtree.size - set the observed extent of points.

Queues

Evaluate asynchronous tasks with configurable concurrency.

d3.queue - manage the concurrent evaluation of asynchronous tasks.
queue.defer - register a task for evaluation.
queue.abort - abort any active tasks and cancel any pending ones.
queue.await - register a callback for when tasks complete.
queue.awaitAll - register a callback for when tasks complete.

Random Numbers

Generate random numbers from various distributions.

d3.randomUniform - from a uniform distribution.
d3.randomNormal - from a normal distribution.
d3.randomLogNormal - from a log-normal distribution.
d3.randomBates - from a Bates distribution.
d3.randomIrwinHall - from an Irwin–Hall distribution.
d3.randomExponential - from an exponential distribution.

Requests

A convenient alternative to asynchronous XMLHttpRequest.

d3.request - make an asynchronous request.
request.header - set a request header.
request.mimeType - set the MIME type.
request.timeout - set the timeout in milliseconds.
request.responseType - set the response type.
request.response - set the response function.
request.get - send a GET request.
request.post - send a POST request.
request.send - set the request.
request.abort - abort the request.
request.on - listen for a request event.
d3.csv - get a comma-separated values (CSV) file.
d3.html - get an HTML file.
d3.json - get a JSON file.
d3.text - get a plain text file.
d3.tsv - get a tab-separated values (TSV) file.
d3.xml - get an XML file.

Scales

Encodings that map abstract data to visual representation.

Continuous Scales

Map a continuous, quantitative domain to a continuous range.

continuous - compute the range value corresponding to a given domain value.
continuous.invert - compute the domain value corresponding to a given range value.
continuous.domain - set the input domain.
continuous.range - set the output range.
continuous.rangeRound - set the output range and enable rounding.
continuous.clamp - enable clamping to the domain or range.
continuous.interpolate - set the output interpolator.
continuous.ticks - compute representative values from the domain.
continuous.tickFormat - format ticks for human consumption.
continuous.nice - extend the domain to nice round numbers.
continuous.copy - create a copy of this scale.
d3.scaleLinear - create a quantitative linear scale.
d3.scalePow - create a quantitative power scale.
pow - compute the range value corresponding to a given domain value.
pow.invert - compute the domain value corresponding to a given range value.
pow.exponent - set the power exponent.
pow.domain - set the input domain.
pow.range - set the output range.
pow.rangeRound - set the output range and enable rounding.
pow.clamp - enable clamping to the domain or range.
pow.interpolate - set the output interpolator.
pow.ticks - compute representative values from the domain.
pow.tickFormat - format ticks for human consumption.
pow.nice - extend the domain to nice round numbers.
pow.copy - create a copy of this scale.
d3.scaleSqrt - create a quantitative power scale with exponent 0.5.
d3.scaleLog - create a quantitative logarithmic scale.
log - compute the range value corresponding to a given domain value.
log.invert - compute the domain value corresponding to a given range value.
log.base - set the logarithm base.
log.domain - set the input domain.
log.range - set the output range.
log.rangeRound - set the output range and enable rounding.
log.clamp - enable clamping to the domain or range.
log.interpolate - set the output interpolator.
log.ticks - compute representative values from the domain.
log.tickFormat - format ticks for human consumption.
log.nice - extend the domain to nice round numbers.
log.copy - create a copy of this scale.
d3.scaleIdentity - create a quantitative identity scale.
d3.scaleTime - create a linear scale for time.
time - compute the range value corresponding to a given domain value.
time.invert - compute the domain value corresponding to a given range value.
time.domain - set the input domain.
time.range - set the output range.
time.rangeRound - set the output range and enable rounding.
time.clamp - enable clamping to the domain or range.
time.interpolate - set the output interpolator.
time.ticks - compute representative values from the domain.
time.tickFormat - format ticks for human consumption.
time.nice - extend the domain to nice round times.
time.copy - create a copy of this scale.
d3.scaleUtc - create a linear scale for UTC.

Sequential Color Scales

Map a continuous, quantitative domain to a continuous, fixed color ramp.

d3.scaleViridis - a dark-to-light color scheme.
d3.scaleInferno - a dark-to-light color scheme.
d3.scaleMagma - a dark-to-light color scheme.
d3.scalePlasma - a dark-to-light color scheme.
d3.scaleWarm - a rotating-hue color scheme.
d3.scaleCool - a rotating-hue color scheme.
d3.scaleRainbow - a cyclical rotating-hue color scheme.
d3.scaleCubehelix - a dark-to-light, rotating-hue color scheme.

Quantize Scales

Map a continuous, quantitative domain to a discrete range.

d3.scaleQuantize - create a uniform quantizing linear scale.
quantize - compute the range value corresponding to a given domain value.
quantize.invertExtent - compute the domain values corresponding to a given range value.
quantize.domain - set the input domain.
quantize.range - set the output range.
quantize.nice - extend the domain to nice round numbers.
quantize.ticks - compute representative values from the domain.
quantize.tickFormat - format ticks for human consumption.
quantize.copy - create a copy of this scale.
d3.scaleQuantile - create a quantile quantizing linear scale.
quantile - compute the range value corresponding to a given domain value.
quantile.invertExtent - compute the domain values corresponding to a given range value.
quantile.domain - set the input domain.
quantile.range - set the output range.
quantile.quantiles - get the quantile thresholds.
quantile.copy - create a copy of this scale.
d3.scaleThreshold - create an arbitrary quantizing linear scale.
threshold - compute the range value corresponding to a given domain value.
threshold.invertExtent - compute the domain values corresponding to a given range value.
threshold.domain - set the input domain.
threshold.range - set the output range.
threshold.copy - create a copy of this scale.

Ordinal Scales

Map a discrete domain to a discrete range.

d3.scaleOrdinal - create an ordinal scale.
ordinal - compute the range value corresponding to a given domain value.
ordinal.domain - set the input domain.
ordinal.range - set the output range.
ordinal.unknown - set the output value for unknown inputs.
ordinal.copy - create a copy of this scale.
d3.scaleImplicit - a special unknown value for implicit domains.
d3.scaleBand - create an ordinal band scale.
band - compute the band start corresponding to a given domain value.
band.domain - set the input domain.
band.range - set the output range.
band.rangeRound - set the output range and enable rounding.
band.round - enable rounding.
band.paddingInner - set padding between bands.
band.paddingOuter - set padding outside the first and last bands.
band.padding - set padding outside and between bands.
band.align - set band alignment, if there is extra space.
band.bandwidth - get the width of each band.
band.step - get the distance between the starts of adjacent bands.
band.copy - create a copy of this scale.
d3.scalePoint - create an ordinal point scale.
point - compute the point corresponding to a given domain value.
point.domain - set the input domain.
point.range - set the output range.
point.rangeRound - set the output range and enable rounding.
point.round - enable rounding.
point.padding - set padding outside the first and last point.
point.align - set point alignment, if there is extra space.
point.bandwidth - returns zero.
point.step - get the distance between the starts of adjacent points.
point.copy - create a copy of this scale.

Categorical Color Scales

Map a discrete domain to a discrete, fixed categorical color range.

d3.scaleCategory10 - a categorical scheme with 10 colors.
d3.scaleCategory20 - a categorical scheme with 20 colors.
d3.scaleCategory20b - a categorical scheme with 20 colors.
d3.scaleCategory20c - a categorical scheme with 20 colors.

Selections

Transform the DOM by selecting elements and joining to data.

Selecting Elements

d3.selection - select the root document element.
d3.select - select an element from the document.
d3.selectAll - select multiple elements from the document.
selection.select - select a descendant element for each selected element.
selection.selectAll - select multiple descendants for each selected element.
selection.filter - filter elements based on data.
d3.matcher - test whether an element matches a selector.
d3.selector - select an element.
d3.selectorAll - select elements.
d3.window - get a node’s owner window.

Modifying Elements

selection.attr - get or set an attribute.
selection.classed - get, add or remove CSS classes.
selection.style - get or set a style property.
selection.property - get or set a (raw) property.
selection.text - get or set the text content.
selection.html - get or set the inner HTML.
selection.append - create, append and select new elements.
selection.remove - remove elements from the document.
selection.sort - sort elements in the document based on data.
selection.order - reorders elements in the document to match the selection.
selection.raise - reorders each element as the last child of its parent.
selection.lower - reorders each element as the first child of its parent.
d3.creator - create an element by name.

Joining Data

selection.data - join elements to data.
selection.enter - get the enter selection (data missing elements).
selection.exit - get the exit selection (elements missing data).
selection.datum - get or set element data (without joining).

Handling Events

selection.on - add or remove event listeners.
selection.dispatch - dispatch a custom event.
d3.event - the current user event, during interaction.
d3.mouse - get the mouse position relative to a given container.
d3.touch - get a touch position relative to a given container.
d3.touches - get the touch positions relative to a given container.

Control Flow

selection.each - call a function for each element.
selection.call - call a function with this selection.
selection.empty - returns true if this selection is empty.
selection.nodes - returns an array of all selected elements.
selection.node - returns the first (non-null) element.
selection.size - returns the count of elements.

Namespaces

d3.namespace - qualify a prefixed XML name, such as “xlink:href”.
d3.namespaces - the built-in XML namespaces.

Shapes

Graphical primitives for visualization.

Arcs

Circular or annular sectors, as in a pie or donut chart.

d3.arc - create a new arc generator.
arc - generate an arc for the given datum.
arc.centroid - compute an arc’s midpoint.
arc.innerRadius - set the inner radius.
arc.outerRadius - set the outer radius.
arc.cornerRadius - set the corner radius, for rounded corners.
arc.startAngle - set the start angle.
arc.endAngle - set the end angle.
arc.padAngle - set the angle between adjacent arcs, for padded arcs.
arc.padRadius - set the radius at which to linearize padding.
arc.context - set the rendering context.

Pies

Compute the necessary angles to represent a tabular dataset as a pie or donut chart.

d3.pie - create a new pie generator.
pie - compute the arc angles for the given dataset.
pie.value - set the value accessor.
pie.sort - set the sort order comparator.
pie.sortValues - set the sort order comparator.
pie.startAngle - set the overall start angle.
pie.endAngle - set the overall end angle.
pie.padAngle - set the pad angle between adjacent arcs.

Lines

A spline or polyline, as in a line chart.

d3.line - create a new line generator.
line - generate a line for the given dataset.
line.x - set the x accessor.
line.y - set the y accessor.
line.defined - set the defined accessor.
line.curve - set the curve interpolator.
line.context - set the rendering context.
d3.radialLine - create a new radial line generator.
radialLine - generate a line for the given dataset.
radialLine.angle - set the angle accessor.
radialLine.radius - set the radius accessor.
radialLine.defined - set the defined accessor.
radialLine.curve - set the curve interpolator.
radialLine.context - set the rendering context.

Areas

An area, defined by a bounding topline and baseline, as in an area chart.

d3.area - create a new area generator.
area - generate an area for the given dataset.
area.x - set the x0 and x1 accessors.
area.x0 - set the baseline x accessor.
area.x1 - set the topline x accessor.
area.y - set the y0 and y1 accessors.
area.y0 - set the baseline y accessor.
area.y1 - set the topline y accessor.
area.defined - set the defined accessor.
area.curve - set the curve interpolator.
area.context - set the rendering context.
d3.radialArea - create a new radial area generator.
radialArea - generate an area for the given dataset.
radialArea.angle - set the start and end angle accessors.
radialArea.startAngle - set the start angle accessor.
radialArea.endAngle - set the end angle accessor.
radialArea.radius - set the inner and outer radius accessors.
radialArea.innerRadius - set the inner radius accessor.
radialArea.outerRadius - set the outer radius accessor.
radialArea.defined - set the defined accessor.
radialArea.curve - set the curve interpolator.
radialArea.context - set the rendering context.

Curves

Interpolate between points to produce a continuous shape.

d3.curveBasis - a cubic basis spline, repeating the end points.
d3.curveBasisClosed - a closed cubic basis spline.
d3.curveBasisOpen - a cubic basis spline.
d3.curveBundle - a straightened cubic basis spline.
d3.curveCardinal - a cubic cardinal spline, with one-sided difference at each end.
d3.curveCardinalClosed - a closed cubic cardinal spline.
d3.curveCardinalOpen - a cubic cardinal spline.
d3.curveCatmullRom - a cubic Catmull–Rom spline, with one-sided difference at each end.
d3.curveCatmullRomClosed - a closed cubic Catmull–Rom spline.
d3.curveCatmullRomOpen - a cubic Catmull–Rom spline.
d3.curveLinear - a polyline.
d3.curveLinearClosed - a closed polyline.
d3.curveMonotoneX - a cubic spline that, given monotonicity in x, preserves it in y.
d3.curveMonotoneY - a cubic spline that, given monotonicity in y, preserves it in x.
d3.curveNatural - a natural cubic spline.
d3.curveStep - a piecewise constant function.
d3.curveStepAfter - a piecewise constant function.
d3.curveStepBefore - a piecewise constant function.
curve.areaStart - start a new area segment.
curve.areaEnd - end the current area segment.
curve.lineStart - start a new line segment.
curve.lineEnd - end the current line segment.
curve.point - add a point to the current line segment.