409 lines
12 KiB
JavaScript
409 lines
12 KiB
JavaScript
function fetchDataLength(path, callback) {
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let xhr = new XMLHttpRequest();
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xhr.open('HEAD', path, true);
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xhr.onreadystatechange = function() {
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if (xhr.readyState === 4) {
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if (xhr.status === 200) {
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callback(xhr.getResponseHeader('Content-Length'));
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}
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}
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};
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xhr.send();
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}
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function fetchData(path, start, end, callback) {
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let xhr = new XMLHttpRequest();
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xhr.open('GET', path, true);
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xhr.setRequestHeader('Range', 'bytes=' + start + "-" + (end - 1));
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xhr.onreadystatechange = function() {
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if (xhr.readyState === 4) {
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if (xhr.status === 206) {
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callback(xhr.responseText);
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}
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}
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};
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xhr.send();
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}
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function parseLine(line, number) {
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let element = {};
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let split = line.split('#')[0].split(/[ \t]+/);
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if (split.length === 0) {
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return;
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}
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switch (split[0]) {
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case "v":
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element.type = Element.AddVertex;
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element.value = new THREE.Vector3(
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parseFloat(split[1]),
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parseFloat(split[2]),
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parseFloat(split[3]),
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);
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return element;
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case "f":
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element.type = Element.AddFace;
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element.value = new THREE.Face3(
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parseInt(split[1], 10) - 1,
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parseInt(split[2], 10) - 1,
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parseInt(split[3], 10) - 1,
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);
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return element;
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case "fc":
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element.type = Element.SetFaceColor;
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element.id = parseInt(split[1], 10) - 1;
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element.value = new THREE.Color(
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parseFloat(split[2]),
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parseFloat(split[3]),
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parseFloat(split[4]),
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);
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return element;
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case "ts":
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element.type = Element.AddTriangleStrip;
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element.value = [];
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for (let i = 1; i < split.length - 2; i++) {
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element.value.push(new THREE.Face3(
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parseInt(split[i] , 10) - 1,
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i % 2 === 1 ? parseInt(split[i+1], 10) - 1 : parseInt(split[i+2], 10) - 1,
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i % 2 === 1 ? parseInt(split[i+2], 10) - 1 : parseInt(split[i+1], 10) - 1,
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));
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}
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return element;
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case "tf":
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element.type = Element.AddTriangleFan;
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element.value = [];
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for (let i = 1; i < split.length - 2; i++) {
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element.value.push(new THREE.Face3(
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parseInt(split[1] , 10) - 1,
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parseInt(split[i+1], 10) - 1,
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parseInt(split[i+2], 10) - 1,
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));
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}
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return element;
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case "ev":
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element.type = Element.EditVertex;
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element.id = parseInt(split[1], 10) - 1;
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element.value = new THREE.Vector3(
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parseFloat(split[2]),
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parseFloat(split[3]),
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parseFloat(split[4]),
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);
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return element;
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case "tv":
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element.type = Element.TranslateVertex;
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element.id = parseInt(split[1], 10) - 1;
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element.value = new THREE.Vector3(
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parseFloat(split[2]),
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parseFloat(split[3]),
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parseFloat(split[4]),
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);
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return element;
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case "pv":
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element.type = Element.PredictVertex;
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element.value = new THREE.Face3(
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parseInt(split[2], 10) - 1,
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parseInt(split[2], 10) - 1,
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parseInt(split[2], 10) - 1,
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);
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return element;
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case "efv":
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element.type = Element.EditFaceVertex;
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element.id = parseInt(split[1], 10) - 1;
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element.oldIndex = parseInt(split[2], 10) - 1;
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element.value = parseInt(split[3], 10) - 1;
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return element;
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case "ef":
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element.type = Element.EditFace;
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element.id = parseInt(split[1], 10) - 1;
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element.value = new THREE.Face3(
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parseInt(split[2], 10) - 1,
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parseInt(split[3], 10) - 1,
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parseInt(split[4], 10) - 1,
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);
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return element;
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case "df":
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element.type = Element.DeleteFace;
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element.id = parseInt(split[1], 10) - 1;
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return element;
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case "":
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case "#":
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return;
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default:
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return;
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// throw new Error(split[0] + " is not a defined macro in line " + number);
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}
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}
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const Element = {};
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Element.AddVertex = "AddVertex";
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Element.AddFace = "AddFace";
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Element.AddTriangleStrip = "AddTriangleStrip";
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Element.AddTriangleFan = "AddTriangleFan";
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Element.EditVertex = "EditVertex";
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Element.EditFace = "EditFace";
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Element.EditFaceVertex = "EditFaceVertex";
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Element.TranslateVertex = "TranslateVertex";
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Element.DeleteFace = "DeleteFace";
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Element.SetFaceColor = "SetFaceColor";
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Element.PredictVertex = "PredictVertex";
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class Loader {
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constructor(path, chunkSize = 1024, timeout = 20) {
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this.path = path;
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this.chunkSize = chunkSize;
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this.timeout = timeout;
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this.currentByte = 0;
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this.remainder = "";
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}
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start(callback) {
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fetchDataLength(this.path, (length) => {
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this.dataLength = length;
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this.next(callback);
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});
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}
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percentage() {
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return 100 * this.currentByte / this.dataLength;
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}
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next(callback) {
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this.downloadAndParseNextChunk((data) => {
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callback(data);
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setTimeout(() => {
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this.next(callback);
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}, this.timeout);
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});
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}
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downloadAndParseNextChunk(callback) {
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let upperBound = Math.min(this.currentByte + this.chunkSize, this.dataLength);
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if (upperBound <= this.currentByte) {
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return;
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}
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fetchData(this.path, this.currentByte, upperBound, (data) => {
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this.currentByte = upperBound;
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let elements = [];
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let split = data.split('\n');
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split[0] = this.remainder + split[0];
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this.remainder = split.pop();
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for (let i = 0; i < split.length; i++) {
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elements.push(parseLine(split[i], i));
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}
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callback(elements);
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});
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}
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}
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class Model extends THREE.Mesh {
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constructor(path) {
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let geometry = new THREE.Geometry();
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let materials = [
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new THREE.MeshLambertMaterial( { color: 0xffffff, side: THREE.DoubleSide } ),
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new THREE.MeshBasicMaterial( { transparent: true, opacity: 0 } )
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];
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materials[0].vertexColors = true;
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super(geometry, materials);
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this.frustumCulled = false;
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this.path = path;
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this.vertices = [];
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this.currentLine = 1;
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}
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throwError(message) {
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let e = new Error("In " + this.path + ":L" + this.currentLine + " " + message);
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e.type = "custom";
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throw e;
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}
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checkVertex(id) {
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if (this.geometry.vertices[id] === undefined) {
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this.throwError("EditVertex requires vertex " + (id + 1) + " but there is no such vertex");
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}
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}
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checkFaceId(id) {
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if (this.geometry.faces[id] === undefined) {
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this.throwError("EditFace requires face " + (id + 1) + " but there is no such face");
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}
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}
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checkFace(f) {
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let vertices = this.geometry.vertices;
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if (vertices[f.a] === undefined) {
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this.throwError("Face requires vertex " + (f.a + 1) + " but there is no such vertex");
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}
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if (vertices[f.b] === undefined) {
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this.throwError("Face requires vertex " + (f.b + 1) + " but there is no such vertex");
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}
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if (vertices[f.c] === undefined) {
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this.throwError("Face requires vertex " + (f.c + 1) + " but there is no such vertex");
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}
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}
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checkVertexPrediction(f) {
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let vertices = this.geometry.vertices;
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if (vertices[f.a] === undefined) {
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this.throwError("Vertex prediction requires vertex " + (f.a + 1) + " but there is no such vertex");
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}
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if (vertices[f.b] === undefined) {
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this.throwError("Vertex prediction requires vertex " + (f.b + 1) + " but there is no such vertex");
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}
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if (vertices[f.c] === undefined) {
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this.throwError("Vertex prediction requires vertex " + (f.c + 1) + " but there is no such vertex");
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}
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}
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manageElement(element) {
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let vertices = this.geometry.vertices;
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let f, normal;
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switch (element.type) {
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case Element.AddVertex:
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this.geometry.vertices.push(element.value);
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this.geometry.verticesNeedUpdate = true;
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break;
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case Element.EditVertex:
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this.checkVertex(element.id);
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this.geometry.vertices[element.id].copy(element.value);
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this.geometry.verticesNeedUpdate = true;
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break;
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case Element.TranslateVertex:
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this.checkVertex(element.id);
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this.geometry.vertices[element.id].add(element.value);
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this.geometry.verticesNeedUpdate = true;
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break;
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case Element.AddFace:
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f = element.value;
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this.checkFace(f);
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normal =
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vertices[f.b].clone().sub(vertices[f.a])
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.cross(vertices[f.c].clone().sub(vertices[f.a]));
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normal.normalize();
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f.normal = normal;
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f.materialIndex = 0;
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this.geometry.faces.push(f);
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this.geometry.elementsNeedUpdate = true;
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break;
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case Element.AddTriangleStrip:
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case Element.AddTriangleFan:
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for (let f of element.value) {
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this.checkFace(f);
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let normal =
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vertices[f.b].clone().sub(vertices[f.a])
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.cross(vertices[f.c].clone().sub(vertices[f.a]));
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normal.normalize();
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f.normal = normal;
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f.materialIndex = 0;
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this.geometry.faces.push(f);
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}
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this.geometry.elementsNeedUpdate = true;
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break;
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case Element.EditFace:
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f = element.value;
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this.checkFaceId(element.id);
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this.checkFace(f);
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normal =
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vertices[f.b].clone().sub(vertices[f.a])
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.cross(vertices[f.c].clone().sub(vertices[f.a]));
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normal.normalize();
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f.normal = normal;
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f.color = this.geometry.faces[element.id].color;
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this.geometry.faces[element.id] = f;
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this.geometry.elementsNeedUpdate = true;
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break;
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case Element.EditFaceVertex:
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this.checkFaceId(element.id);
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switch (element.oldIndex) {
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case 0: this.geometry.faces[element.id].a = element.value; break;
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case 1: this.geometry.faces[element.id].b = element.value; break;
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case 2: this.geometry.faces[element.id].c = element.value; break;
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default: this.throwError("Old vertex id in EditFaceVertex must be 1, 2 or 3, but was " + element.oldIndex + 1);
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}
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this.geometry.elementsNeedUpdate = true;
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break;
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case Element.DeleteFace:
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this.geometry.faces[element.id].materialIndex = 1;
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this.geometry.elementsNeedUpdate = true;
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break;
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case Element.SetFaceColor:
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this.geometry.faces[element.id].color.r = element.value.r;
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this.geometry.faces[element.id].color.g = element.value.g;
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this.geometry.faces[element.id].color.b = element.value.b;
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this.geometry.colorsNeedUpdate = true;
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break;
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case Element.PredictVertex:
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this.checkVertexPrediction(element.value);
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vertices.push(vertices[element.value.a].clone()
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.add(vertices[element.value.c])
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.sub(vertices[element.value.b]));
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this.geometry.verticesNeedUpdate = true;
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break;
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default:
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throw new Error("unknown element type: " + element.type);
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}
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this.currentLine++;
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}
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}
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