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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title>CityJSON viewer</title>
<style>
body { margin: 0; }
canvas { width: 100%; height: 100% }
</style>
</head>
<body>
<link rel="stylesheet" href="./css/cityjson.css">
<div class="pageHead">
<div class="dropboxBox">
<form id="dropbox" class="my-form">
<p class="dbText">Drop your CityJSON file here!</p>
<input type="file" id="fileElem" onchange="handleFiles(this.files)">
</div>
<div class="switchBox">
<label class="switch">
<input type="checkbox" id="wireframeBox" onclick="wireframeFunc()"> <p class="dbText"> Display wireframe geometry </p>
<span class="slider round"></span>
</label>
</div>
</div>
<script src="js/three.min.js"></script>
<script src="js/OrbitControls.js"></script>
<script src="js/jquery-3.3.1.min.js"></script>
<script>
// Handle the dropped CityJSON file
function jsonGetter (url) {
"use strict"
// Create new geometry for the new mesh
var geom = new THREE.Geometry();
$.getJSON(url, function (json) {
// Remove old geometry from scene
while(scene.children.length > 0){
scene.remove(scene.children[0]);
};
// Add vertices to geometry
for (var i = 0; i < json.vertices.length; i++) {
geom.vertices.push( new THREE.Vector3 (
json.vertices[i][0],
json.vertices[i][1],
json.vertices[i][2]));
}
var objColors = {
"Building": 0xcc0000,
"BuildingPart": 0xcc0000,
"BuildingInstallation": 0xcc0000,
"Bridge": 0x999999,
"BridgePart": 0x999999,
"BridgeInstallation": 0x999999,
"BridgeConstructionElement": 0x999999,
"CityObjectGroup": 0xffffb3,
"CityFurniture": 0xcc0000,
"GenericCityObject": 0xcc0000,
"LandUse": 0xffffb3,
"PlantCover": 0x39ac39,
"Railway": 0x000000,
"Road": 0x999999,
"SolitaryVegetationObject": 0x39ac39,
"TINRelief": 0x39ac39,
"TransportSquare": 0x999999,
"Tunnel": 0x999999,
"TunnelPart": 0x999999,
"TunnelInstallation": 0x999999,
"WaterBody": 0x4da6ff
};
var faceCounter = 0;
// Add faces to geometry
for (var cityObj in json.CityObjects){
var coType = json.CityObjects[cityObj].type;
for (var geomNum = 0; geomNum < json.CityObjects[cityObj].geometry.length; geomNum++) {
if (json.CityObjects[cityObj].geometry[geomNum].type == ("MultiSurface" || "CompositeSurface")) {
for (var j = 0; j < json.CityObjects[cityObj].geometry[geomNum].boundaries.length; j++) {
geom.faces.push( new THREE.Face3(
json.CityObjects[cityObj].geometry[geomNum].boundaries[j][0][0],
json.CityObjects[cityObj].geometry[geomNum].boundaries[j][0][1],
json.CityObjects[cityObj].geometry[geomNum].boundaries[j][0][2]
));
var currentFace = geom.faces[ faceCounter ];
currentFace.color.setHex( objColors[coType] );
faceCounter += 1;
};
};
if (json.CityObjects[cityObj].geometry[geomNum].type == "Solid") {
for (var k = 0; k < json.CityObjects[cityObj].geometry[geomNum].boundaries[0].length; k++) {
geom.faces.push( new THREE.Face3(
json.CityObjects[cityObj].geometry[geomNum].boundaries[0][k][0][0],
json.CityObjects[cityObj].geometry[geomNum].boundaries[0][k][0][1],
json.CityObjects[cityObj].geometry[geomNum].boundaries[0][k][0][2]
));
var currentFace = geom.faces[ faceCounter ];
currentFace.color.setHex( objColors[coType] );
faceCounter += 1;
};
};
if (json.CityObjects[cityObj].geometry[geomNum].type == ("MultiSolid" || "CompositeSolid")) {
for (var l = 0; l < json.CityObjects[cityObj].geometry[geomNum].boundaries.length; l++) {
for (var m = 0; m < json.CityObjects[cityObj].geometry[geomNum].boundaries[l][0].length; m++) {
geom.faces.push( new THREE.Face3(
json.CityObjects[cityObj].geometry[geomNum].boundaries[l][0][m][0][0],
json.CityObjects[cityObj].geometry[geomNum].boundaries[l][0][m][0][1],
json.CityObjects[cityObj].geometry[geomNum].boundaries[l][0][m][0][2]
));
var currentFace = geom.faces[ faceCounter ];
currentFace.color.setHex( objColors[coType] );
faceCounter += 1;
};
};
};
};
};
// Material for mesh
var material = new THREE.MeshBasicMaterial( {
vertexColors: THREE.VertexColors,
flatShading: THREE.FlatShading,
polygonOffset: true,
polygonOffsetFactor: 1, // positive value pushes polygon further away
polygonOffsetUnits: 1
} );
// Add mesh to scene
var mymesh = new THREE.Mesh(geom, material);
mymesh.material.side = THREE.DoubleSide;
mymesh.geometry.normalize();
mymesh.name = "CJMesh"
scene.add(mymesh);
// Add wireframe if box is checked
if (document.getElementById("wireframeBox").checked == true){
wireframeFunc()
};
// Reposition camera
camera.position.set(0, 0, 2);
camera.lookAt(0, 0, 0);
// Render & orbit controls
var controls = new THREE.OrbitControls( camera, renderer.domElement );
controls.target.set(0, 0, 0);
controls.addEventListener( 'change', function() { renderer.render(scene, camera); } );
renderer.render(scene, camera);
});
};
// Wireframe checkbox function
function wireframeFunc() {
// Get the checkbox
var checkBox = document.getElementById("wireframeBox");
if (checkBox.checked == true){
// Add edges
var currentMesh = scene.getObjectByName( "CJMesh" );
var geo = new THREE.EdgesGeometry( currentMesh.geometry );
var mat = new THREE.LineBasicMaterial( { color: 0x000000, linewidth: .1, transparent: true, opacity: 0.2 } );
var wireframe = new THREE.LineSegments( geo, mat );
wireframe.name = "wireframe"
scene.add( wireframe );
renderer.render(scene, camera);
} else { // remove edges
scene.remove(scene.getObjectByName("wireframe"));
renderer.render(scene, camera);
};
};
// Dropbox functions
var dropbox;
dropbox = document.getElementById("dropbox");
dropbox.addEventListener("dragenter", dragenter, false);
dropbox.addEventListener("dragover", dragover, false);
dropbox.addEventListener("drop", drop, false);
['dragover'].forEach(eventName => {
dropbox.addEventListener(eventName, highlight, false)
})
;['dragleave', 'drop'].forEach(eventName => {
dropbox.addEventListener(eventName, unhighlight, false)
})
function highlight(e) {
dropbox.classList.add('highlight')
}
function unhighlight(e) {
dropbox.classList.remove('highlight')
}
function dragenter(e) {
e.stopPropagation();
e.preventDefault();
}
function dragover(e) {
e.stopPropagation();
e.preventDefault();
}
function drop(e) {
e.stopPropagation();
e.preventDefault();
var dt = e.dataTransfer;
var files = dt.files;
handleFiles(files);
}
function handleFiles(files) {
var jsonfile = files[0]
var objectURL = window.URL.createObjectURL(jsonfile);
jsonGetter(objectURL)
}
// Initiate scene, camera, renderer
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(
60, // Field of view
window.innerWidth/window.innerHeight, // Aspect ratio
0.1, // Near clipping pane
10000 // Far clipping pane
);
var renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setClearColor( 0xFFFFFF );
document.body.appendChild( renderer.domElement );
renderer.render(scene, camera);
</script>
</body>
</html>