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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
/**
* Color the boxes in the treemap
*/
const TYPES = [ "objects", "other", "strings", "scripts" ];
// The factors determine how much the hue shifts
const TYPE_FACTOR = TYPES.length * 3;
const DEPTH_FACTOR = -10;
const H = 0.5;
const S = 0.6;
const L = 0.9;
/**
* Recursively find the index of the coarse type of a node
*
* @param {Object} node
* d3 treemap
* @return {Integer}
* index
*/
function findCoarseTypeIndex(node) {
let index = TYPES.indexOf(node.name);
if (node.parent) {
return index === -1 ? findCoarseTypeIndex(node.parent) : index;
}
return TYPES.indexOf("other");
}
/**
* Decide a color value for depth to be used in the HSL computation
*
* @param {Object} node
* @return {Number}
*/
function depthColorFactor(node) {
return Math.min(1, node.depth / DEPTH_FACTOR);
}
/**
* Decide a color value for type to be used in the HSL computation
*
* @param {Object} node
* @return {Number}
*/
function typeColorFactor(node) {
return findCoarseTypeIndex(node) / TYPE_FACTOR;
}
/**
* Color a node
*
* @param {Object} node
* @return {Array} HSL values ranged 0-1
*/
module.exports = function colorCoarseType(node) {
let h = Math.min(1, H + typeColorFactor(node));
let s = Math.min(1, S);
let l = Math.min(1, L + depthColorFactor(node));
return [h, s, l];
};
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