chart/heatMap.js

import * as d3 from "d3";
import dataTransform from "../dataTransform.js";
import component from "../component.js";
import { createScene } from "../base.js";
/**
 * Reusable 3D Heat Map
 *
 * @module
 *
 * @example
 * let chartHolder = d3.select("#chartholder");
 *
 * let myData = [...];
 *
 * let myChart = d3.x3d.chart.heatMap();
 *
 * chartHolder.datum(myData).call(myChart);
 *
 * @see https://datavizproject.com/data-type/heat-map/
 */
export default function() {
	/* Default Properties */
	let width = 500;
	let height = 500;
	let dimensions = { x: 40, y: 20, z: 40 };
	let colors = ["#1e253f", "#e33b30"];
	let classed = "d3X3dHeatMap";
	let labelPosition = "distal";
	let debug = false;
	/* Scales */
	let xScale;
	let yScale;
	let zScale;
	let colorScale;
	/* Components */
	const viewpoint = component.viewpoint();
	const axis = component.axisThreePlane();
	const bars = component.heatMap();
	const light = component.light();
	/**
	 * Initialise Data and Scales
	 *
	 * @private
	 * @param {Array} data - Chart data.
	 */
	const init = function(data) {
		const { rowKeys, columnKeys, valueMax } = dataTransform(data).summary();
		const valueExtent = [0, valueMax];
		const { x: dimensionX, y: dimensionY, z: dimensionZ } = dimensions;
		xScale = d3.scaleBand()
			.domain(columnKeys)
			.range([0, dimensionX])
			.paddingOuter(0.5)
			.paddingInner(0.1)
			.align(1);
		yScale = d3.scaleLinear()
			.domain(valueExtent)
			.range([0, dimensionY])
			.nice();
		zScale = d3.scaleBand()
			.domain(rowKeys.reverse())
			.range([0, dimensionZ])
			.paddingOuter(0.5)
			.paddingInner(0.1)
			.align(1);
		colorScale = d3.scaleLinear()
			.domain(valueExtent)
			.range(colors);
	};
	/**
	 * Constructor
	 *
	 * @constructor
	 * @alias heatMap
	 * @param {d3.selection} selection - The chart holder D3 selection.
	 */
	const my = function(selection) {
		const layers = ["axis", "bars"];
		const scene = createScene(selection, layers, classed, width, height, debug);
		selection.each((data) => {
			init(data);
			// Add Viewpoint
			viewpoint.centerOfRotation([dimensions.x / 2, dimensions.y / 2, dimensions.z / 2]);
			scene.call(viewpoint);
			// Add Axis
			axis.xScale(xScale)
				.yScale(yScale)
				.zScale(zScale)
				.labelPosition(labelPosition);
			scene.select(".axis")
				.call(axis);
			// Add Bars
			bars.xScale(xScale)
				.yScale(yScale)
				.zScale(zScale)
				.colors(colors);
			scene.select(".bars")
				.datum(data)
				.call(bars);
			// Add Light
			scene.call(light);
		});
	};
	/**
	 * Width Getter / Setter
	 *
	 * @param {number} _v - X3D canvas width in px.
	 * @returns {*}
	 */
	my.width = function(_v) {
		if (!arguments.length) return width;
		width = _v;
		return this;
	};
	/**
	 * Height Getter / Setter
	 *
	 * @param {number} _v - X3D canvas height in px.
	 * @returns {*}
	 */
	my.height = function(_v) {
		if (!arguments.length) return height;
		height = _v;
		return this;
	};
	/**
	 * Dimensions Getter / Setter
	 *
	 * @param {{x: number, y: number, z: number}} _v - 3D object dimensions.
	 * @returns {*}
	 */
	my.dimensions = function(_v) {
		if (!arguments.length) return dimensions;
		dimensions = _v;
		return this;
	};
	/**
	 * X Scale Getter / Setter
	 *
	 * @param {d3.scale} _v - D3 scale.
	 * @returns {*}
	 */
	my.xScale = function(_v) {
		if (!arguments.length) return xScale;
		xScale = _v;
		return my;
	};
	/**
	 * Y Scale Getter / Setter
	 *
	 * @param {d3.scale} _v - D3 scale.
	 * @returns {*}
	 */
	my.yScale = function(_v) {
		if (!arguments.length) return yScale;
		yScale = _v;
		return my;
	};
	/**
	 * Z Scale Getter / Setter
	 *
	 * @param {d3.scale} _v - D3 scale.
	 * @returns {*}
	 */
	my.zScale = function(_v) {
		if (!arguments.length) return zScale;
		zScale = _v;
		return my;
	};
	/**
	 * Color Scale Getter / Setter
	 *
	 * @param {d3.scale} _v - D3 color scale.
	 * @returns {*}
	 */
	my.colorScale = function(_v) {
		if (!arguments.length) return colorScale;
		colorScale = _v;
		return my;
	};
	/**
	 * Colors Getter / Setter
	 *
	 * @param {Array} _v - Array of colours used by color scale.
	 * @returns {*}
	 */
	my.colors = function(_v) {
		if (!arguments.length) return colors;
		colors = _v;
		return my;
	};
	/**
	 * Label Position Getter / Setter
	 *
	 * @param {string} _v - Position ("proximal" or "distal")
	 * @returns {*}
	 */
	my.labelPosition = function(_v) {
		if (!arguments.length) return labelPosition;
		labelPosition = _v;
		return my;
	};
	/**
	 * Debug Getter / Setter
	 *
	 * @param {boolean} _v - Show debug log and stats. True/False.
	 * @returns {*}
	 */
	my.debug = function(_v) {
		if (!arguments.length) return debug;
		debug = _v;
		return my;
	};
	return my;
}