drone web interface

web/STLLoader.js

@@ -0,0 +1,386 @@
+/**
+ * @author aleeper / http://adamleeper.com/
+ * @author mrdoob / http://mrdoob.com/
+ * @author gero3 / https://github.com/gero3
+ *
+ * Description: A THREE loader for STL ASCII files, as created by Solidworks and other CAD programs.
+ *
+ * Supports both binary and ASCII encoded files, with automatic detection of type.
+ *
+ * Limitations:
+ * 	Binary decoding ignores header. There doesn't seem to be much of a use for it.
+ * 	There is perhaps some question as to how valid it is to always assume little-endian-ness.
+ * 	ASCII decoding assumes file is UTF-8. Seems to work for the examples...
+ *
+ * Usage:
+ * 	var loader = new THREE.STLLoader();
+ * 	loader.addEventListener( 'load', function ( event ) {
+ *
+ * 		var geometry = event.content;
+ * 		scene.add( new THREE.Mesh( geometry ) );
+ *
+ * 	} );
+ * 	loader.load( './models/stl/slotted_disk.stl' );
+ */
+
+
+THREE.STLLoader = function () {};
+
+THREE.STLLoader.prototype = {
+
+	constructor: THREE.STLLoader
+
+};
+
+THREE.STLLoader.prototype.load = function (url, callback) {
+
+	var scope = this;
+
+	var xhr = new XMLHttpRequest();
+
+	function onloaded( event ) {
+
+		if ( event.target.status === 200 || event.target.status === 0 ) {
+
+				var geometry = scope.parse( event.target.response || event.target.responseText );
+
+				scope.dispatchEvent( { type: 'load', content: geometry } );
+
+				if ( callback ) callback( geometry );
+
+		} else {
+
+			scope.dispatchEvent( { type: 'error', message: 'Couldn\'t load URL [' + url + ']',
+				response: event.target.responseText } );
+
+		}
+
+	}
+
+	xhr.addEventListener( 'load', onloaded, false );
+
+	xhr.addEventListener( 'progress', function ( event ) {
+
+		scope.dispatchEvent( { type: 'progress', loaded: event.loaded, total: event.total } );
+
+	}, false );
+
+	xhr.addEventListener( 'error', function () {
+
+		scope.dispatchEvent( { type: 'error', message: 'Couldn\'t load URL [' + url + ']' } );
+
+	}, false );
+
+	xhr.overrideMimeType('text/plain; charset=x-user-defined');
+	xhr.open( 'GET', url, true );
+	xhr.responseType = "arraybuffer";
+	xhr.send( null );
+
+};
+
+THREE.STLLoader.prototype.parse = function (data) {
+
+
+	var isBinary = function () {
+
+		var expect, face_size, n_faces, reader;
+		reader = new DataView( binData );
+		face_size = (32 / 8 * 3) + ((32 / 8 * 3) * 3) + (16 / 8);
+		n_faces = reader.getUint32(80,true);
+		expect = 80 + (32 / 8) + (n_faces * face_size);
+		return expect === reader.byteLength;
+
+	};
+
+	var binData = this.ensureBinary( data );
+
+	return isBinary()
+		? this.parseBinary( binData )
+		: this.parseASCII( this.ensureString( data ) );
+
+};
+
+THREE.STLLoader.prototype.parseBinary = function (data) {
+
+	var face, geometry, n_faces, reader, length, normal, i, dataOffset, faceLength, start, vertexstart;
+
+	reader = new DataView( data );
+	n_faces = reader.getUint32(80,true);
+	geometry = new THREE.Geometry();
+	dataOffset = 84;
+	faceLength = 12 * 4 + 2;
+
+	for (face = 0; face < n_faces; face++) {
+
+		start = dataOffset + face * faceLength;
+		normal = new THREE.Vector3(
+			reader.getFloat32(start,true),
+			reader.getFloat32(start + 4,true),
+			reader.getFloat32(start + 8,true)
+		);
+
+		for (i = 1; i <= 3; i++) {
+
+			vertexstart = start + i * 12;
+			geometry.vertices.push(
+				new THREE.Vector3(
+					reader.getFloat32(vertexstart,true),
+					reader.getFloat32(vertexstart +4,true),
+					reader.getFloat32(vertexstart + 8,true)
+				)
+			);
+
+		}
+
+		length = geometry.vertices.length;
+		geometry.faces.push(new THREE.Face3(length - 3, length - 2, length - 1, normal));
+
+	}
+
+	geometry.computeCentroids();
+	geometry.computeBoundingSphere();
+
+	return geometry;
+
+};
+
+THREE.STLLoader.prototype.parseASCII = function (data) {
+
+	var geometry, length, normal, patternFace, patternNormal, patternVertex, result, text;
+	geometry = new THREE.Geometry();
+	patternFace = /facet([\s\S]*?)endfacet/g;
+
+	while (((result = patternFace.exec(data)) != null)) {
+
+		text = result[0];
+		patternNormal = /normal[\s]+([\-+]?[0-9]+\.?[0-9]*([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+/g;
+
+		while (((result = patternNormal.exec(text)) != null)) {
+
+			normal = new THREE.Vector3(parseFloat(result[1]), parseFloat(result[3]), parseFloat(result[5]));
+
+		}
+
+		patternVertex = /vertex[\s]+([\-+]?[0-9]+\.?[0-9]*([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+/g;
+
+		while (((result = patternVertex.exec(text)) != null)) {
+
+			geometry.vertices.push(new THREE.Vector3(parseFloat(result[1]), parseFloat(result[3]), parseFloat(result[5])));
+
+		}
+
+		length = geometry.vertices.length;
+		geometry.faces.push(new THREE.Face3(length - 3, length - 2, length - 1, normal));
+
+	}
+
+	geometry.computeCentroids();
+	geometry.computeBoundingBox();
+	geometry.computeBoundingSphere();
+
+	return geometry;
+
+};
+
+THREE.STLLoader.prototype.ensureString = function (buf) {
+
+	if (typeof buf !== "string"){
+		var array_buffer = new Uint8Array(buf);
+		var str = '';
+		for(var i = 0; i < buf.byteLength; i++) {
+			str += String.fromCharCode(array_buffer[i]); // implicitly assumes little-endian
+		}
+		return str;
+	} else {
+		return buf;
+	}
+
+};
+
+THREE.STLLoader.prototype.ensureBinary = function (buf) {
+
+	if (typeof buf === "string"){
+		var array_buffer = new Uint8Array(buf.length);
+		for(var i = 0; i < buf.length; i++) {
+			array_buffer[i] = buf.charCodeAt(i) & 0xff; // implicitly assumes little-endian
+		}
+		return array_buffer.buffer || array_buffer;
+	} else {
+		return buf;
+	}
+
+};
+
+THREE.EventDispatcher.prototype.apply( THREE.STLLoader.prototype );
+
+if ( typeof DataView === 'undefined'){
+
+	DataView = function(buffer, byteOffset, byteLength){
+
+		this.buffer = buffer;
+		this.byteOffset = byteOffset || 0;
+		this.byteLength = byteLength || buffer.byteLength || buffer.length;
+		this._isString = typeof buffer === "string";
+
+	}
+
+	DataView.prototype = {
+
+		_getCharCodes:function(buffer,start,length){
+			start = start || 0;
+			length = length || buffer.length;
+			var end = start + length;
+			var codes = [];
+			for (var i = start; i < end; i++) {
+				codes.push(buffer.charCodeAt(i) & 0xff);
+			}
+			return codes;
+		},
+
+		_getBytes: function (length, byteOffset, littleEndian) {
+
+			var result;
+
+			// Handle the lack of endianness
+			if (littleEndian === undefined) {
+
+				littleEndian = this._littleEndian;
+
+			}
+
+			// Handle the lack of byteOffset
+			if (byteOffset === undefined) {
+
+				byteOffset = this.byteOffset;
+
+			} else {
+
+				byteOffset = this.byteOffset + byteOffset;
+
+			}
+
+			if (length === undefined) {
+
+				length = this.byteLength - byteOffset;
+
+			}
+
+			// Error Checking
+			if (typeof byteOffset !== 'number') {
+
+				throw new TypeError('DataView byteOffset is not a number');
+
+			}
+
+			if (length < 0 || byteOffset + length > this.byteLength) {
+
+				throw new Error('DataView length or (byteOffset+length) value is out of bounds');
+
+			}
+
+			if (this.isString){
+
+				result = this._getCharCodes(this.buffer, byteOffset, byteOffset + length);
+
+			} else {
+
+				result = this.buffer.slice(byteOffset, byteOffset + length);
+
+			}
+
+			if (!littleEndian && length > 1) {
+
+				if (!(result instanceof Array)) {
+
+					result = Array.prototype.slice.call(result);
+
+				}
+
+				result.reverse();
+			}
+
+			return result;
+
+		},
+
+		// Compatibility functions on a String Buffer
+
+		getFloat64: function (byteOffset, littleEndian) {
+
+			var b = this._getBytes(8, byteOffset, littleEndian),
+
+				sign = 1 - (2 * (b[7] >> 7)),
+				exponent = ((((b[7] << 1) & 0xff) << 3) | (b[6] >> 4)) - ((1 << 10) - 1),
+
+			// Binary operators such as | and << operate on 32 bit values, using + and Math.pow(2) instead
+				mantissa = ((b[6] & 0x0f) * Math.pow(2, 48)) + (b[5] * Math.pow(2, 40)) + (b[4] * Math.pow(2, 32)) +
+							(b[3] * Math.pow(2, 24)) + (b[2] * Math.pow(2, 16)) + (b[1] * Math.pow(2, 8)) + b[0];
+
+			if (exponent === 1024) {
+				if (mantissa !== 0) {
+					return NaN;
+				} else {
+					return sign * Infinity;
+				}
+			}
+
+			if (exponent === -1023) { // Denormalized
+				return sign * mantissa * Math.pow(2, -1022 - 52);
+			}
+
+			return sign * (1 + mantissa * Math.pow(2, -52)) * Math.pow(2, exponent);
+
+		},
+
+		getFloat32: function (byteOffset, littleEndian) {
+
+			var b = this._getBytes(4, byteOffset, littleEndian),
+
+				sign = 1 - (2 * (b[3] >> 7)),
+				exponent = (((b[3] << 1) & 0xff) | (b[2] >> 7)) - 127,
+				mantissa = ((b[2] & 0x7f) << 16) | (b[1] << 8) | b[0];
+
+			if (exponent === 128) {
+				if (mantissa !== 0) {
+					return NaN;
+				} else {
+					return sign * Infinity;
+				}
+			}
+
+			if (exponent === -127) { // Denormalized
+				return sign * mantissa * Math.pow(2, -126 - 23);
+			}
+
+			return sign * (1 + mantissa * Math.pow(2, -23)) * Math.pow(2, exponent);
+		},
+
+		getInt32: function (byteOffset, littleEndian) {
+			var b = this._getBytes(4, byteOffset, littleEndian);
+			return (b[3] << 24) | (b[2] << 16) | (b[1] << 8) | b[0];
+		},
+
+		getUint32: function (byteOffset, littleEndian) {
+			return this.getInt32(byteOffset, littleEndian) >>> 0;
+		},
+
+		getInt16: function (byteOffset, littleEndian) {
+			return (this.getUint16(byteOffset, littleEndian) << 16) >> 16;
+		},
+
+		getUint16: function (byteOffset, littleEndian) {
+			var b = this._getBytes(2, byteOffset, littleEndian);
+			return (b[1] << 8) | b[0];
+		},
+
+		getInt8: function (byteOffset) {
+			return (this.getUint8(byteOffset) << 24) >> 24;
+		},
+
+		getUint8: function (byteOffset) {
+			return this._getBytes(1, byteOffset)[0];
+		}
+
+	 };
+
+}