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