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dot.js
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import {pathRound as path, symbolCircle} from "d3";
import {create} from "../context.js";
import {negative, positive} from "../defined.js";
import {Mark} from "../mark.js";
import {identity, maybeFrameAnchor, maybeNumberChannel, maybeTuple} from "../options.js";
import {
applyChannelStyles,
applyDirectStyles,
applyFrameAnchor,
applyIndirectStyles,
applyTransform
} from "../style.js";
import {maybeSymbolChannel} from "../symbol.js";
import {template} from "../template.js";
import {sort} from "../transforms/basic.js";
import {maybeIntervalMidX, maybeIntervalMidY} from "../transforms/interval.js";
const defaults = {
ariaLabel: "dot",
fill: "none",
stroke: "currentColor",
strokeWidth: 1.5
};
export function withDefaultSort(options) {
return options.sort === undefined && options.reverse === undefined ? sort({channel: "-r"}, options) : options;
}
export class Dot extends Mark {
constructor(data, options = {}) {
const {x, y, r, rotate, symbol = symbolCircle, frameAnchor} = options;
const [vrotate, crotate] = maybeNumberChannel(rotate, 0);
const [vsymbol, csymbol] = maybeSymbolChannel(symbol);
const [vr, cr] = maybeNumberChannel(r, vsymbol == null ? 3 : 4.5);
super(
data,
{
x: {value: x, scale: "x", optional: true},
y: {value: y, scale: "y", optional: true},
r: {value: vr, scale: "r", filter: positive, optional: true},
rotate: {value: vrotate, optional: true},
symbol: {value: vsymbol, scale: "auto", optional: true}
},
withDefaultSort(options),
defaults
);
this.r = cr;
this.rotate = crotate;
this.symbol = csymbol;
this.frameAnchor = maybeFrameAnchor(frameAnchor);
// Give a hint to the symbol scale; this allows the symbol scale to choose
// appropriate default symbols based on whether the dots are filled or
// stroked, and for the symbol legend to match the appearance of the dots.
const {channels} = this;
const {symbol: symbolChannel} = channels;
if (symbolChannel) {
const {fill: fillChannel, stroke: strokeChannel} = channels;
symbolChannel.hint = {
fill: fillChannel
? fillChannel.value === symbolChannel.value
? "color"
: "currentColor"
: this.fill ?? "currentColor",
stroke: strokeChannel
? strokeChannel.value === symbolChannel.value
? "color"
: "currentColor"
: this.stroke ?? "none"
};
}
}
render(index, scales, channels, dimensions, context) {
const {x, y} = scales;
const {x: X, y: Y, r: R, rotate: A, symbol: S} = channels;
const {r, rotate, symbol} = this;
const [cx, cy] = applyFrameAnchor(this, dimensions);
const circle = symbol === symbolCircle;
const size = R ? undefined : r * r * Math.PI;
if (negative(r)) index = [];
return create("svg:g", context)
.call(applyIndirectStyles, this, dimensions, context)
.call(applyTransform, this, {x: X && x, y: Y && y})
.call((g) =>
g
.selectAll()
.data(index)
.enter()
.append(circle ? "circle" : "path")
.call(applyDirectStyles, this)
.call(
circle
? (selection) => {
selection
.attr("cx", X ? (i) => X[i] : cx)
.attr("cy", Y ? (i) => Y[i] : cy)
.attr("r", R ? (i) => R[i] : r);
}
: (selection) => {
selection
.attr(
"transform",
template`translate(${X ? (i) => X[i] : cx},${Y ? (i) => Y[i] : cy})${
A ? (i) => ` rotate(${A[i]})` : rotate ? ` rotate(${rotate})` : ``
}`
)
.attr(
"d",
R && S
? (i) => {
const p = path();
S[i].draw(p, R[i] * R[i] * Math.PI);
return p;
}
: R
? (i) => {
const p = path();
symbol.draw(p, R[i] * R[i] * Math.PI);
return p;
}
: S
? (i) => {
const p = path();
S[i].draw(p, size);
return p;
}
: (() => {
const p = path();
symbol.draw(p, size);
return p;
})()
);
}
)
.call(applyChannelStyles, this, channels)
)
.node();
}
}
export function dot(data, {x, y, ...options} = {}) {
if (options.frameAnchor === undefined) [x, y] = maybeTuple(x, y);
return new Dot(data, {...options, x, y});
}
export function dotX(data, {x = identity, ...options} = {}) {
return new Dot(data, maybeIntervalMidY({...options, x}));
}
export function dotY(data, {y = identity, ...options} = {}) {
return new Dot(data, maybeIntervalMidX({...options, y}));
}
export function circle(data, options) {
return dot(data, {...options, symbol: "circle"});
}
export function hexagon(data, options) {
return dot(data, {...options, symbol: "hexagon"});
}