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Tree.js
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Tree.js
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import {extent, min, max} from "d3-array";
import {hierarchy, tree} from "d3-hierarchy";
import {scaleLinear} from "d3-scale";
import {assign, configPrep, constant, elem, merge} from "d3plus-common";
import {Circle, Path} from "d3plus-shape";
import {Viz} from "d3plus-viz";
import {default as nest} from "./nest.js";
/**
@class Tree
@extends Viz
@desc Uses d3's [tree layout](https://github.com/d3/d3-hierarchy#tree) to create a tidy tree chart based on an array of data.
*/
export default class Tree extends Viz {
/**
@memberof Tree
@desc Invoked when creating a new class instance, and sets any default parameters.
@private
*/
constructor() {
super();
this._orient = "vertical";
this._separation = (a, b) => a.parent === b.parent ? 1 : 2;
this._shape = constant("Circle");
this._shapeConfig = assign(this._shapeConfig, {
ariaLabel: (d, i) => this._treeData ? `${this._treeData[i].depth}. ${this._drawLabel(d, i)}.` : "",
labelConfig: {
fontColor: "#444"
},
Path: {
fill: "none",
stroke: "#ccc",
strokeWidth: 1
},
r: constant(5),
width: constant(10),
height: constant(10)
});
this._tree = tree();
}
/**
Extends the draw behavior of the abstract Viz class.
@private
*/
_draw(callback) {
super._draw(callback);
const height = this._orient === "vertical"
? this._height - this._margin.top - this._margin.bottom
: this._width - this._margin.left - this._margin.right,
left = this._orient === "vertical" ? "left" : "top",
that = this,
transform = `translate(${this._margin.left}, ${this._margin.top})`,
width = this._orient === "horizontal"
? this._height - this._margin.top - this._margin.bottom
: this._width - this._margin.left - this._margin.right;
const treeData = this._treeData = this._tree
.separation(this._separation)
.size([width, height])(
hierarchy({
key: "root",
values: nest(this._filteredData, this._groupBy.slice(0, this._drawDepth + 1))
}, d => d.key && d.values ? d.values : null).sort(this._sort)
)
.descendants()
.filter(d => d.depth <= this._groupBy.length && d.parent);
/**
Merges the values of a given nest branch.
@private
*/
function flattenBranchData(branch) {
return merge(branch.values.map(l => l.key && l.values ? flattenBranchData(l) : l), that._aggs);
}
treeData.forEach((d, i) => {
if (d.data.key && d.data.values) d.data = flattenBranchData(d.data);
d.__d3plus__ = true;
d.i = i;
});
let r = this._shapeConfig.r;
if (typeof r !== "function") r = constant(r);
const rBufferRoot = max(treeData, d => d.depth === 1 ? r(d.data, d.i) : 0);
const rBufferEnd = max(treeData, d => d.children ? 0 : r(d.data, d.i));
const yExtent = extent(treeData, d => d.y);
this._labelHeight = min([
this._orient === "vertical" ? 50 : 100,
(yExtent[1] - rBufferRoot - rBufferEnd) / (this._groupBy.length + 1)
]);
this._labelWidths = nest(treeData, d => d.depth)
.map(d => d.values.reduce((num, v, i) => {
const next = i < d.values.length - 1 ? d.values[i + 1].x : width + this._margin[left],
prev = i ? d.values[i - 1].x : this._margin[left];
return min([num, next - v.x, v.x - prev]);
}, width));
const yScale = scaleLinear()
.domain(yExtent)
.range([rBufferRoot + this._labelHeight, height - rBufferEnd - this._labelHeight]);
treeData.forEach(d => {
const val = yScale(d.y);
if (this._orient === "horizontal") {
d.y = d.x;
d.x = val;
}
else d.y = val;
});
const elemObject = {parent: this._select, enter: {transform}, update: {transform}};
this._shapes.push(new Path()
.data(treeData.filter(d => d.depth > 1))
.select(elem("g.d3plus-Tree-Links", elemObject).node())
.config(configPrep.bind(this)(this._shapeConfig, "shape", "Path"))
.config({
d: d => {
let r = this._shapeConfig.r;
if (typeof r === "function") r = r(d.data, d.i);
const px = d.parent.x - d.x + (this._orient === "vertical" ? 0 : r),
py = d.parent.y - d.y + (this._orient === "vertical" ? r : 0),
x = this._orient === "vertical" ? 0 : -r,
y = this._orient === "vertical" ? -r : 0;
return this._orient === "vertical"
? `M${x},${y}C${x},${(y + py) / 2} ${px},${(y + py) / 2} ${px},${py}`
: `M${x},${y}C${(x + px) / 2},${y} ${(x + px) / 2},${py} ${px},${py}`;
},
id: (d, i) => this._ids(d, i).join("-")
})
.render());
this._shapes.push(new Circle()
.data(treeData)
.select(elem("g.d3plus-Tree-Shapes", elemObject).node())
.config(configPrep.bind(this)(this._shapeConfig, "shape", "Circle"))
.config({
id: (d, i) => this._ids(d, i).join("-"),
label: (d, i) => {
if (this._label) return this._label(d.data, i);
const ids = this._ids(d, i).slice(0, d.depth);
return ids[ids.length - 1];
},
labelConfig: {
textAnchor: d => this._orient === "vertical" ? "middle"
: d.data.children && d.data.depth !== this._groupBy.length ? "end" : "start",
verticalAlign: d => this._orient === "vertical" ? d.data.depth === 1 ? "bottom" : "top" : "middle"
},
hitArea: (d, i, s) => {
const h = this._labelHeight,
w = this._labelWidths[d.depth - 1];
return {
width: this._orient === "vertical" ? w : s.r * 2 + w,
height: this._orient === "horizontal" ? h : s.r * 2 + h,
x: this._orient === "vertical" ? -w / 2 : d.children && d.depth !== this._groupBy.length ? -(s.r + w) : -s.r,
y: this._orient === "horizontal" ? -h / 2 : d.children && d.depth !== this._groupBy.length ? -(s.r + this._labelHeight) : -s.r
};
},
labelBounds: (d, i, s) => {
const h = this._labelHeight,
height = this._orient === "vertical" ? "height" : "width",
w = this._labelWidths[d.depth - 1],
width = this._orient === "vertical" ? "width" : "height",
x = this._orient === "vertical" ? "x" : "y",
y = this._orient === "vertical" ? "y" : "x";
return {
[width]: w,
[height]: h,
[x]: -w / 2,
[y]: d.children && d.depth !== this._groupBy.length ? -(s.r + h) : s.r
};
}
})
.render());
return this;
}
/**
@memberof Tree
@desc If *value* is specified, sets the orientation to the specified value. If *value* is not specified, returns the current orientation.
@param {String} [*value* = "vertical"] Accepts either "vertical" or "horizontal".
*/
orient(_) {
return arguments.length ? (this._orient = _, this) : this._orient;
}
/**
@memberof Tree
@desc If *value* is specified, sets the separation accessor to the specified function. If *value* is not specified, returns the current separation accessor.
From the [d3-hierarchy documentation](https://github.com/d3/d3-hierarchy#tree_separation):
> The separation accessor is used to separate neighboring nodes. The separation function is passed two nodes a and b, and must return the desired separation. The nodes are typically siblings, though the nodes may be more distantly related if the layout decides to place such nodes adjacent.
@param {Function} [*value*]
@example
function separation(a, b) {
return a.parent === b.parent ? 1 : 2;
}
*/
separation(_) {
return arguments.length ? (this._separation = _, this) : this._separation;
}
}