125 lines
3.2 KiB
JavaScript
125 lines
3.2 KiB
JavaScript
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) {
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let element = {};
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let split = line.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 "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 "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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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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throw new Error(split[0] + " is not a defined macro");
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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.EditVertex = "EditVertex";
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Element.EditFace = "EditFace";
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Element.DeleteFace = "DeleteFace";
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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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this.downloadAndParseNextChunk((data) => {
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callback(data);
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setTimeout(() => {
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this.start(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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fetchData(this.path, this.currentByte, this.currentByte + this.chunkSize, (data) => {
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if (data.length === 0) {
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console.log("Loading finished");
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return;
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}
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this.currentByte += this.chunkSize;
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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 line of split) {
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elements.push(parseLine(line));
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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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