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<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<title>Three.js - Lots of Objects - Multiple Datasets</title>
<style>
html, body {
height: 100%;
margin: 0;
color: white;
}
#c {
width: 100%;
height: 100%;
display: block;
}
#ui {
position: absolute;
left: 1em;
top: 1em;
}
#ui>div {
font-size: 20pt;
padding: 1em;
display: inline-block;
}
#ui>div.selected {
color: red;
}
@media (max-width: 700px) {
#ui>div {
display: block;
padding: .25em;
}
}
</style>
</head>
<body>
<canvas id="c"></canvas>
<div id="ui"></div>
</body>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../../build/three.module.js",
"three/addons/": "../../examples/jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
import {OrbitControls} from 'three/addons/controls/OrbitControls.js';
function main() {
const canvas = document.querySelector('#c');
const renderer = new THREE.WebGLRenderer({canvas});
const fov = 60;
const aspect = 2; // the canvas default
const near = 0.1;
const far = 10;
const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
camera.position.z = 2.5;
const controls = new OrbitControls(camera, canvas);
controls.enableDamping = true;
controls.enablePan = false;
controls.minDistance = 1.2;
controls.maxDistance = 4;
controls.update();
const scene = new THREE.Scene();
scene.background = new THREE.Color('black');
{
const loader = new THREE.TextureLoader();
const texture = loader.load('resources/images/world.jpg', render);
const geometry = new THREE.SphereGeometry(1, 64, 32);
const material = new THREE.MeshBasicMaterial({map: texture});
scene.add(new THREE.Mesh(geometry, material));
}
async function loadFile(url) {
const req = await fetch(url);
return req.text();
}
function parseData(text) {
const data = [];
const settings = {data};
let max;
let min;
// split into lines
text.split('\n').forEach((line) => {
// split the line by whitespace
const parts = line.trim().split(/\s+/);
if (parts.length === 2) {
// only 2 parts, must be a key/value pair
settings[parts[0]] = parseFloat(parts[1]);
} else if (parts.length > 2) {
// more than 2 parts, must be data
const values = parts.map((v) => {
const value = parseFloat(v);
if (value === settings.NODATA_value) {
return undefined;
}
max = Math.max(max === undefined ? value : max, value);
min = Math.min(min === undefined ? value : min, value);
return value;
});
data.push(values);
}
});
return Object.assign(settings, {min, max});
}
function addBoxes(file, hueRange) {
const {min, max, data} = file;
const range = max - min;
// these helpers will make it easy to position the boxes
// We can rotate the lon helper on its Y axis to the longitude
const lonHelper = new THREE.Object3D();
scene.add(lonHelper);
// We rotate the latHelper on its X axis to the latitude
const latHelper = new THREE.Object3D();
lonHelper.add(latHelper);
// The position helper moves the object to the edge of the sphere
const positionHelper = new THREE.Object3D();
positionHelper.position.z = 1;
latHelper.add(positionHelper);
// Used to move the center of the cube so it scales from the position Z axis
const originHelper = new THREE.Object3D();
originHelper.position.z = 0.5;
positionHelper.add(originHelper);
const color = new THREE.Color();
const lonFudge = Math.PI * .5;
const latFudge = Math.PI * -0.135;
const geometries = [];
data.forEach((row, latNdx) => {
row.forEach((value, lonNdx) => {
if (value === undefined) {
return;
}
const amount = (value - min) / range;
const boxWidth = 1;
const boxHeight = 1;
const boxDepth = 1;
const geometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);
// adjust the helpers to point to the latitude and longitude
lonHelper.rotation.y = THREE.MathUtils.degToRad(lonNdx + file.xllcorner) + lonFudge;
latHelper.rotation.x = THREE.MathUtils.degToRad(latNdx + file.yllcorner) + latFudge;
// use the world matrix of the origin helper to
// position this geometry
positionHelper.scale.set(0.005, 0.005, THREE.MathUtils.lerp(0.01, 0.5, amount));
originHelper.updateWorldMatrix(true, false);
geometry.applyMatrix4(originHelper.matrixWorld);
// compute a color
const hue = THREE.MathUtils.lerp(...hueRange, amount);
const saturation = 1;
const lightness = THREE.MathUtils.lerp(0.4, 1.0, amount);
color.setHSL(hue, saturation, lightness);
// get the colors as an array of values from 0 to 255
const rgb = color.toArray().map(v => v * 255);
// make an array to store colors for each vertex
const numVerts = geometry.getAttribute('position').count;
const itemSize = 3; // r, g, b
const colors = new Uint8Array(itemSize * numVerts);
// copy the color into the colors array for each vertex
colors.forEach((v, ndx) => {
colors[ndx] = rgb[ndx % 3];
});
const normalized = true;
const colorAttrib = new THREE.BufferAttribute(colors, itemSize, normalized);
geometry.setAttribute('color', colorAttrib);
geometries.push(geometry);
});
});
const mergedGeometry = BufferGeometryUtils.mergeBufferGeometries(
geometries, false);
const material = new THREE.MeshBasicMaterial({
vertexColors: true,
});
const mesh = new THREE.Mesh(mergedGeometry, material);
scene.add(mesh);
return mesh;
}
async function loadData(info) {
const text = await loadFile(info.url);
info.file = parseData(text);
}
async function loadAll() {
const fileInfos = [
{name: 'men', hueRange: [0.7, 0.3], url: 'resources/data/gpw/gpw_v4_basic_demographic_characteristics_rev10_a000_014mt_2010_cntm_1_deg.asc' },
{name: 'women', hueRange: [0.9, 1.1], url: 'resources/data/gpw/gpw_v4_basic_demographic_characteristics_rev10_a000_014ft_2010_cntm_1_deg.asc' },
];
await Promise.all(fileInfos.map(loadData));
function mapValues(data, fn) {
return data.map((row, rowNdx) => {
return row.map((value, colNdx) => {
return fn(value, rowNdx, colNdx);
});
});
}
function makeDiffFile(baseFile, otherFile, compareFn) {
let min;
let max;
const baseData = baseFile.data;
const otherData = otherFile.data;
const data = mapValues(baseData, (base, rowNdx, colNdx) => {
const other = otherData[rowNdx][colNdx];
if (base === undefined || other === undefined) {
return undefined;
}
const value = compareFn(base, other);
min = Math.min(min === undefined ? value : min, value);
max = Math.max(max === undefined ? value : max, value);
return value;
});
// make a copy of baseFile and replace min, max, and data
// with the new data
return {...baseFile, min, max, data};
}
// generate a new set of data
{
const menInfo = fileInfos[0];
const womenInfo = fileInfos[1];
const menFile = menInfo.file;
const womenFile = womenInfo.file;
function amountGreaterThan(a, b) {
return Math.max(a - b, 0);
}
fileInfos.push({
name: '>50%men',
hueRange: [0.6, 1.1],
file: makeDiffFile(menFile, womenFile, (men, women) => {
return amountGreaterThan(men, women);
}),
});
fileInfos.push({
name: '>50% women',
hueRange: [0.0, 0.4],
file: makeDiffFile(womenFile, menFile, (women, men) => {
return amountGreaterThan(women, men);
}),
});
}
// show the selected data, hide the rest
function showFileInfo(fileInfos, fileInfo) {
fileInfos.forEach((info) => {
const visible = fileInfo === info;
info.root.visible = visible;
info.elem.className = visible ? 'selected' : '';
});
requestRenderIfNotRequested();
}
const uiElem = document.querySelector('#ui');
fileInfos.forEach((info) => {
const boxes = addBoxes(info.file, info.hueRange);
info.root = boxes;
const div = document.createElement('div');
info.elem = div;
div.textContent = info.name;
uiElem.appendChild(div);
function show() {
showFileInfo(fileInfos, info);
}
div.addEventListener('mouseover', show);
div.addEventListener('touchstart', show);
});
// show the first set of data
showFileInfo(fileInfos, fileInfos[0]);
}
loadAll();
function resizeRendererToDisplaySize(renderer) {
const canvas = renderer.domElement;
const width = canvas.clientWidth;
const height = canvas.clientHeight;
const needResize = canvas.width !== width || canvas.height !== height;
if (needResize) {
renderer.setSize(width, height, false);
}
return needResize;
}
let renderRequested = false;
function render() {
renderRequested = undefined;
if (resizeRendererToDisplaySize(renderer)) {
const canvas = renderer.domElement;
camera.aspect = canvas.clientWidth / canvas.clientHeight;
camera.updateProjectionMatrix();
}
controls.update();
renderer.render(scene, camera);
}
render();
function requestRenderIfNotRequested() {
if (!renderRequested) {
renderRequested = true;
requestAnimationFrame(render);
}
}
controls.addEventListener('change', requestRenderIfNotRequested);
window.addEventListener('resize', requestRenderIfNotRequested);
}
main();
</script>
</html>