写在前面
本期小编给大家分享一颗热烈且浪漫的爱心，快来看看吧！
准备开始
在开始之前，我们需要先简单的了解一下这颗爱心的原理哦~
本期将用html实现这颗跳动的爱心，我们先从html开始吧！
HTML（HyperText Markup Language）是一种用于创建网页结构和内容的标记语言。它是Web开发中最基本的技术之一，用于描述和组织网页的内容。
HTML最初由Tim Berners-Lee于1991年创造，作为一种用于共享科学研究成果的标准化形式。HTML使用标记（tag）来定义文本的结构和语义，并将其呈现为具有超链接的富文本文档。通过使用标记、元素和属性，HTML可以定义文本的标题、段落、列表、表格和图像等内容。
HTML是一种使用尖括号包围的标签语言。标签通常由一个起始标签（opening tag）和一个结束标签（closing tag）组成，两个标签之间的内容表示要被标记的文本。起始标签和结束标签可以包含属性，用于进一步定义和修饰标记的行为和外观。
在HTML中，元素是由标签组成的，可以包含文本、其他元素或者二者的组合。最常见的HTML元素包括标题元素（如<h1>到<h6>）、段落元素（如<p>）、列表元素（如<ul>和<li>）和超链接元素（如<a>）。通过嵌套和组合这些元素，可以创建出复杂的网页结构。
HTML标记还可以使用属性来进一步定义和修饰元素。属性提供了关于元素的额外信息，如元素的尺寸、颜色或布局等。常见的HTML属性包括id（标识元素的唯一标识符），class（用于将元素分组或应用样式）和style（内联样式）等。
HTML是一种层次结构的语言，文档的整体结构由多个元素组成，可以组织成树状结构。通常使用<html>元素作为根元素，它包含<head>元素和<body>元素。<head>元素用于定义文档的元数据，如标题和链接，而<body>元素包含实际的内容。
HTML可以通过文本编辑器编写，并在Web浏览器中进行查看。一旦HTML文档完成，可以通过将其保存成.html文件并在浏览器中打开来实现呈现。浏览器将解析HTML代码并显示其内容，呈现为用户可见的网页。
虽然HTML本身具有一定的格式和样式，但它通常与CSS（Cascading Style Sheets）和JavaScript等技术一起使用，以实现更丰富和交互式的网页效果。CSS用于定义网页的样式和布局，而JavaScript用于添加交互性和动态效果。
总之，HTML是用于创建Web内容的基本技术之一，它定义了网页的结构和内容。通过使用标记、元素和属性，可以创建出具有超链接和富文本特性的网页。与CSS和JavaScript等技术结合使用，HTML可以实现更丰富和交互式的网页效果。
完整代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>跳动的爱心</title> </head> <body> <script src='./js/three.min.js'></script> <script src='./js/TrackballControls.js'></script> <script src='./js/simplex-noise.js'></script> <script src='./js/OBJLoader.js'></script> <script src='./js/gsap.min.js'></script> <script src="./js/script.js"></script> <script> (function () { const _face = new THREE.Triangle(); const _color = new THREE.Vector3(); class MeshSurfaceSampler { constructor(mesh) { let geometry = mesh.geometry; if (!geometry.isBufferGeometry || geometry.attributes.position.itemSize !== 3) { throw new Error('THREE.MeshSurfaceSampler: Requires BufferGeometry triangle mesh.'); } if (geometry.index) { console.warn('THREE.MeshSurfaceSampler: Converting geometry to non-indexed BufferGeometry.'); geometry = geometry.toNonIndexed(); } this.geometry = geometry; this.randomFunction = Math.random; this.positionAttribute = this.geometry.getAttribute('position'); this.colorAttribute = this.geometry.getAttribute('color'); this.weightAttribute = null; this.distribution = null; } setWeightAttribute(name) { this.weightAttribute = name ? this.geometry.getAttribute(name) : null; return this; } build() { const positionAttribute = this.positionAttribute; const weightAttribute = this.weightAttribute; const faceWeights = new Float32Array(positionAttribute.count / 3); for (let i = 0; i < positionAttribute.count; i += 3) { let faceWeight = 1; if (weightAttribute) { faceWeight = weightAttribute.getX(i) + weightAttribute.getX(i + 1) + weightAttribute.getX(i + 2); } _face.a.fromBufferAttribute(positionAttribute, i); _face.b.fromBufferAttribute(positionAttribute, i + 1); _face.c.fromBufferAttribute(positionAttribute, i + 2); faceWeight *= _face.getArea(); faceWeights[i / 3] = faceWeight; } this.distribution = new Float32Array(positionAttribute.count / 3); let cumulativeTotal = 0; for (let i = 0; i < faceWeights.length; i++) { cumulativeTotal += faceWeights[i]; this.distribution[i] = cumulativeTotal; } return this; } setRandomGenerator(randomFunction) { this.randomFunction = randomFunction; return this; } sample(targetPosition, targetNormal, targetColor) { const cumulativeTotal = this.distribution[this.distribution.length - 1]; const faceIndex = this.binarySearch(this.randomFunction() * cumulativeTotal); return this.sampleFace(faceIndex, targetPosition, targetNormal, targetColor); } binarySearch(x) { const dist = this.distribution; let start = 0; let end = dist.length - 1; let index = - 1; while (start <= end) { const mid = Math.ceil((start + end) / 2); if (mid === 0 || dist[mid - 1] <= x && dist[mid] > x) { index = mid; break; } else if (x < dist[mid]) { end = mid - 1; } else { start = mid + 1; } } return index; } sampleFace(faceIndex, targetPosition, targetNormal, targetColor) { let u = this.randomFunction(); let v = this.randomFunction(); if (u + v > 1) { u = 1 - u; v = 1 - v; } _face.a.fromBufferAttribute(this.positionAttribute, faceIndex * 3); _face.b.fromBufferAttribute(this.positionAttribute, faceIndex * 3 + 1); _face.c.fromBufferAttribute(this.positionAttribute, faceIndex * 3 + 2); targetPosition.set(0, 0, 0).addScaledVector(_face.a, u).addScaledVector(_face.b, v).addScaledVector(_face.c, 1 - (u + v)); if (targetNormal !== undefined) { _face.getNormal(targetNormal); } if (targetColor !== undefined && this.colorAttribute !== undefined) { _face.a.fromBufferAttribute(this.colorAttribute, faceIndex * 3); _face.b.fromBufferAttribute(this.colorAttribute, faceIndex * 3 + 1); _face.c.fromBufferAttribute(this.colorAttribute, faceIndex * 3 + 2); _color.set(0, 0, 0).addScaledVector(_face.a, u).addScaledVector(_face.b, v).addScaledVector(_face.c, 1 - (u + v)); targetColor.r = _color.x; targetColor.g = _color.y; targetColor.b = _color.z; } return this; } } THREE.MeshSurfaceSampler = MeshSurfaceSampler; })(); </script> <script> (function () { const _object_pattern = /^[og]\s*(.+)?/; // mtllib file_reference const _material_library_pattern = /^mtllib /; // usemtl material_name const _material_use_pattern = /^usemtl /; // usemap map_name const _map_use_pattern = /^usemap /; const _vA = new THREE.Vector3(); const _vB = new THREE.Vector3(); const _vC = new THREE.Vector3(); const _ab = new THREE.Vector3(); const _cb = new THREE.Vector3(); function ParserState() { const state = { objects: [], object: {}, vertices: [], normals: [], colors: [], uvs: [], materials: {}, materialLibraries: [], startObject: function (name, fromDeclaration) { if (this.object && this.object.fromDeclaration === false) { this.object.name = name; this.object.fromDeclaration = fromDeclaration !== false; return; } const previousMaterial = this.object && typeof this.object.currentMaterial === 'function' ? this.object.currentMaterial() : undefined; if (this.object && typeof this.object._finalize === 'function') { this.object._finalize(true); } this.object = { name: name || '', fromDeclaration: fromDeclaration !== false, geometry: { vertices: [], normals: [], colors: [], uvs: [], hasUVIndices: false }, materials: [], smooth: true, startMaterial: function (name, libraries) { const previous = this._finalize(false); if (previous && (previous.inherited || previous.groupCount <= 0)) { this.materials.splice(previous.index, 1); } const material = { index: this.materials.length, name: name || '', mtllib: Array.isArray(libraries) && libraries.length > 0 ? libraries[libraries.length - 1] : '', smooth: previous !== undefined ? previous.smooth : this.smooth, groupStart: previous !== undefined ? previous.groupEnd : 0, groupEnd: - 1, groupCount: - 1, inherited: false, clone: function (index) { const cloned = { index: typeof index === 'number' ? index : this.index, name: this.name, mtllib: this.mtllib, smooth: this.smooth, groupStart: 0, groupEnd: - 1, groupCount: - 1, inherited: false }; cloned.clone = this.clone.bind(cloned); return cloned; } }; this.materials.push(material); return material; }, currentMaterial: function () { if (this.materials.length > 0) { return this.materials[this.materials.length - 1]; } return undefined; }, _finalize: function (end) { const lastMultiMaterial = this.currentMaterial(); if (lastMultiMaterial && lastMultiMaterial.groupEnd === - 1) { lastMultiMaterial.groupEnd = this.geometry.vertices.length / 3; lastMultiMaterial.groupCount = lastMultiMaterial.groupEnd - lastMultiMaterial.groupStart; lastMultiMaterial.inherited = false; } if (end && this.materials.length > 1) { for (let mi = this.materials.length - 1; mi >= 0; mi--) { if (this.materials[mi].groupCount <= 0) { this.materials.splice(mi, 1); } } } if (end && this.materials.length === 0) { this.materials.push({ name: '', smooth: this.smooth }); } return lastMultiMaterial; } }; if (previousMaterial && previousMaterial.name && typeof previousMaterial.clone === 'function') { const declared = previousMaterial.clone(0); declared.inherited = true; this.object.materials.push(declared); } this.objects.push(this.object); }, finalize: function () { if (this.object && typeof this.object._finalize === 'function') { this.object._finalize(true); } }, parseVertexIndex: function (value, len) { const index = parseInt(value, 10); return (index >= 0 ? index - 1 : index + len / 3) * 3; }, parseNormalIndex: function (value, len) { const index = parseInt(value, 10); return (index >= 0 ? index - 1 : index + len / 3) * 3; }, parseUVIndex: function (value, len) { const index = parseInt(value, 10); return (index >= 0 ? index - 1 : index + len / 2) * 2; }, addVertex: function (a, b, c) { const src = this.vertices; const dst = this.object.geometry.vertices; dst.push(src[a + 0], src[a + 1], src[a + 2]); dst.push(src[b + 0], src[b + 1], src[b + 2]); dst.push(src[c + 0], src[c + 1], src[c + 2]); }, addVertexPoint: function (a) { const src = this.vertices; const dst = this.object.geometry.vertices; dst.push(src[a + 0], src[a + 1], src[a + 2]); }, addVertexLine: function (a) { const src = this.vertices; const dst = this.object.geometry.vertices; dst.push(src[a + 0], src[a + 1], src[a + 2]); }, addNormal: function (a, b, c) { const src = this.normals; const dst = this.object.geometry.normals; dst.push(src[a + 0], src[a + 1], src[a + 2]); dst.push(src[b + 0], src[b + 1], src[b + 2]); dst.push(src[c + 0], src[c + 1], src[c + 2]); }, addFaceNormal: function (a, b, c) { const src = this.vertices; const dst = this.object.geometry.normals; _vA.fromArray(src, a); _vB.fromArray(src, b); _vC.fromArray(src, c); _cb.subVectors(_vC, _vB); _ab.subVectors(_vA, _vB); _cb.cross(_ab); _cb.normalize(); dst.push(_cb.x, _cb.y, _cb.z); dst.push(_cb.x, _cb.y, _cb.z); dst.push(_cb.x, _cb.y, _cb.z); }, addColor: function (a, b, c) { const src = this.colors; const dst = this.object.geometry.colors; if (src[a] !== undefined) dst.push(src[a + 0], src[a + 1], src[a + 2]); if (src[b] !== undefined) dst.push(src[b + 0], src[b + 1], src[b + 2]); if (src[c] !== undefined) dst.push(src[c + 0], src[c + 1], src[c + 2]); }, addUV: function (a, b, c) { const src = this.uvs; const dst = this.object.geometry.uvs; dst.push(src[a + 0], src[a + 1]); dst.push(src[b + 0], src[b + 1]); dst.push(src[c + 0], src[c + 1]); }, addDefaultUV: function () { const dst = this.object.geometry.uvs; dst.push(0, 0); dst.push(0, 0); dst.push(0, 0); }, addUVLine: function (a) { const src = this.uvs; const dst = this.object.geometry.uvs; dst.push(src[a + 0], src[a + 1]); }, addFace: function (a, b, c, ua, ub, uc, na, nb, nc) { const vLen = this.vertices.length; let ia = this.parseVertexIndex(a, vLen); let ib = this.parseVertexIndex(b, vLen); let ic = this.parseVertexIndex(c, vLen); this.addVertex(ia, ib, ic); this.addColor(ia, ib, ic); if (na !== undefined && na !== '') { const nLen = this.normals.length; ia = this.parseNormalIndex(na, nLen); ib = this.parseNormalIndex(nb, nLen); ic = this.parseNormalIndex(nc, nLen); this.addNormal(ia, ib, ic); } else { this.addFaceNormal(ia, ib, ic); } if (ua !== undefined && ua !== '') { const uvLen = this.uvs.length; ia = this.parseUVIndex(ua, uvLen); ib = this.parseUVIndex(ub, uvLen); ic = this.parseUVIndex(uc, uvLen); this.addUV(ia, ib, ic); this.object.geometry.hasUVIndices = true; } else { this.addDefaultUV(); } }, addPointGeometry: function (vertices) { this.object.geometry.type = 'Points'; const vLen = this.vertices.length; for (let vi = 0, l = vertices.length; vi < l; vi++) { const index = this.parseVertexIndex(vertices[vi], vLen); this.addVertexPoint(index); this.addColor(index); } }, addLineGeometry: function (vertices, uvs) { this.object.geometry.type = 'Line'; const vLen = this.vertices.length; const uvLen = this.uvs.length; for (let vi = 0, l = vertices.length; vi < l; vi++) { this.addVertexLine(this.parseVertexIndex(vertices[vi], vLen)); } for (let uvi = 0, l = uvs.length; uvi < l; uvi++) { this.addUVLine(this.parseUVIndex(uvs[uvi], uvLen)); } } }; state.startObject('', false); return state; } class OBJLoader extends THREE.Loader { constructor(manager) { super(manager); this.materials = null; } load(url, onLoad, onProgress, onError) { const scope = this; const loader = new THREE.FileLoader(this.manager); loader.setPath(this.path); loader.setRequestHeader(this.requestHeader); loader.setWithCredentials(this.withCredentials); loader.load(url, function (text) { try { onLoad(scope.parse(text)); } catch (e) { if (onError) { onError(e); } else { console.error(e); } scope.manager.itemError(url); } }, onProgress, onError); } setMaterials(materials) { this.materials = materials; return this; } parse(text) { const state = new ParserState(); if (text.indexOf('\r\n') !== - 1) { text = text.replace(/\r\n/g, '\n'); } if (text.indexOf('\\\n') !== - 1) { text = text.replace(/\\\n/g, ''); } const lines = text.split('\n'); let line = '', lineFirstChar = ''; let lineLength = 0; let result = []; const trimLeft = typeof ''.trimLeft === 'function'; for (let i = 0, l = lines.length; i < l; i++) { line = lines[i]; line = trimLeft ? line.trimLeft() : line.trim(); lineLength = line.length; if (lineLength === 0) continue; lineFirstChar = line.charAt(0); if (lineFirstChar === '#') continue; if (lineFirstChar === 'v') { const data = line.split(/\s+/); switch (data[0]) { case 'v': state.vertices.push(parseFloat(data[1]), parseFloat(data[2]), parseFloat(data[3])); if (data.length >= 7) { state.colors.push(parseFloat(data[4]), parseFloat(data[5]), parseFloat(data[6])); } else { state.colors.push(undefined, undefined, undefined); } break; case 'vn': state.normals.push(parseFloat(data[1]), parseFloat(data[2]), parseFloat(data[3])); break; case 'vt': state.uvs.push(parseFloat(data[1]), parseFloat(data[2])); break; } } else if (lineFirstChar === 'f') { const lineData = line.substr(1).trim(); const vertexData = lineData.split(/\s+/); const faceVertices = []; for (let j = 0, jl = vertexData.length; j < jl; j++) { const vertex = vertexData[j]; if (vertex.length > 0) { const vertexParts = vertex.split('/'); faceVertices.push(vertexParts); } } const v1 = faceVertices[0]; for (let j = 1, jl = faceVertices.length - 1; j < jl; j++) { const v2 = faceVertices[j]; const v3 = faceVertices[j + 1]; state.addFace(v1[0], v2[0], v3[0], v1[1], v2[1], v3[1], v1[2], v2[2], v3[2]); } } else if (lineFirstChar === 'l') { const lineParts = line.substring(1).trim().split(' '); let lineVertices = []; const lineUVs = []; if (line.indexOf('/') === - 1) { lineVertices = lineParts; } else { for (let li = 0, llen = lineParts.length; li < llen; li++) { const parts = lineParts[li].split('/'); if (parts[0] !== '') lineVertices.push(parts[0]); if (parts[1] !== '') lineUVs.push(parts[1]); } } state.addLineGeometry(lineVertices, lineUVs); } else if (lineFirstChar === 'p') { const lineData = line.substr(1).trim(); const pointData = lineData.split(' '); state.addPointGeometry(pointData); } else if ((result = _object_pattern.exec(line)) !== null) { const name = (' ' + result[0].substr(1).trim()).substr(1); state.startObject(name); } else if (_material_use_pattern.test(line)) { state.object.startMaterial(line.substring(7).trim(), state.materialLibraries); } else if (_material_library_pattern.test(line)) { state.materialLibraries.push(line.substring(7).trim()); } else if (_map_use_pattern.test(line)) { console.warn('THREE.OBJLoader: Rendering identifier "usemap" not supported. Textures must be defined in MTL files.'); } else if (lineFirstChar === 's') { result = line.split(' '); if (result.length > 1) { const value = result[1].trim().toLowerCase(); state.object.smooth = value !== '0' && value !== 'off'; } else { state.object.smooth = true; } const material = state.object.currentMaterial(); if (material) material.smooth = state.object.smooth; } else { if (line === '\0') continue; console.warn('THREE.OBJLoader: Unexpected line: "' + line + '"'); } } state.finalize(); const container = new THREE.Group(); container.materialLibraries = [].concat(state.materialLibraries); const hasPrimitives = !(state.objects.length === 1 && state.objects[0].geometry.vertices.length === 0); if (hasPrimitives === true) { for (let i = 0, l = state.objects.length; i < l; i++) { const object = state.objects[i]; const geometry = object.geometry; const materials = object.materials; const isLine = geometry.type === 'Line'; const isPoints = geometry.type === 'Points'; let hasVertexColors = false; if (geometry.vertices.length === 0) continue; const buffergeometry = new THREE.BufferGeometry(); buffergeometry.setAttribute('position', new THREE.Float32BufferAttribute(geometry.vertices, 3)); if (geometry.normals.length > 0) { buffergeometry.setAttribute('normal', new THREE.Float32BufferAttribute(geometry.normals, 3)); } if (geometry.colors.length > 0) { hasVertexColors = true; buffergeometry.setAttribute('color', new THREE.Float32BufferAttribute(geometry.colors, 3)); } if (geometry.hasUVIndices === true) { buffergeometry.setAttribute('uv', new THREE.Float32BufferAttribute(geometry.uvs, 2)); } const createdMaterials = []; for (let mi = 0, miLen = materials.length; mi < miLen; mi++) { const sourceMaterial = materials[mi]; const materialHash = sourceMaterial.name + '_' + sourceMaterial.smooth + '_' + hasVertexColors; let material = state.materials[materialHash]; if (this.materials !== null) { material = this.materials.create(sourceMaterial.name); if (isLine && material && !(material instanceof THREE.LineBasicMaterial)) { const materialLine = new THREE.LineBasicMaterial(); THREE.Material.prototype.copy.call(materialLine, material); materialLine.color.copy(material.color); material = materialLine; } else if (isPoints && material && !(material instanceof THREE.PointsMaterial)) { const materialPoints = new THREE.PointsMaterial({ size: 10, sizeAttenuation: false }); THREE.Material.prototype.copy.call(materialPoints, material); materialPoints.color.copy(material.color); materialPoints.map = material.map; material = materialPoints; } } if (material === undefined) { if (isLine) { material = new THREE.LineBasicMaterial(); } else if (isPoints) { material = new THREE.PointsMaterial({ size: 1, sizeAttenuation: false }); } else { material = new THREE.MeshPhongMaterial(); } material.name = sourceMaterial.name; material.flatShading = sourceMaterial.smooth ? false : true; material.vertexColors = hasVertexColors; state.materials[materialHash] = material; } createdMaterials.push(material); } let mesh; if (createdMaterials.length > 1) { for (let mi = 0, miLen = materials.length; mi < miLen; mi++) { const sourceMaterial = materials[mi]; buffergeometry.addGroup(sourceMaterial.groupStart, sourceMaterial.groupCount, mi); } if (isLine) { mesh = new THREE.LineSegments(buffergeometry, createdMaterials); } else if (isPoints) { mesh = new THREE.Points(buffergeometry, createdMaterials); } else { mesh = new THREE.Mesh(buffergeometry, createdMaterials); } } else { if (isLine) { mesh = new THREE.LineSegments(buffergeometry, createdMaterials[0]); } else if (isPoints) { mesh = new THREE.Points(buffergeometry, createdMaterials[0]); } else { mesh = new THREE.Mesh(buffergeometry, createdMaterials[0]); } } mesh.name = object.name; container.add(mesh); } } else { if (state.vertices.length > 0) { const material = new THREE.PointsMaterial({ size: 1, sizeAttenuation: false }); const buffergeometry = new THREE.BufferGeometry(); buffergeometry.setAttribute('position', new THREE.Float32BufferAttribute(state.vertices, 3)); if (state.colors.length > 0 && state.colors[0] !== undefined) { buffergeometry.setAttribute('color', new THREE.Float32BufferAttribute(state.colors, 3)); material.vertexColors = true; } const points = new THREE.Points(buffergeometry, material); container.add(points); } } return container; } } THREE.OBJLoader = OBJLoader; })(); </script> </body> </html>
运行结果
写在后面
我是一只有趣的兔子，感谢你的喜欢！
