bytev-charts/lib/plugin/three.js/examples/js/loaders/MD2Loader.js

基于echarts和JavaScript及ES6封装的一个可以直接调用的图表组件库，内置主题设计，简单快捷，且支持用户自定义配置； npm 安装方式: npm install bytev-charts 若启动提示还需额外install插件,则运行 npm install @babel/runtime-corejs2 即可;

import "core-js/modules/es.array-buffer.slice.js";
import "core-js/modules/es.data-view.js";
import "core-js/modules/es.object.to-string.js";
import "core-js/modules/es.function.name.js";
import _Object$assign from "@babel/runtime-corejs2/core-js/object/assign";
import _Object$create from "@babel/runtime-corejs2/core-js/object/create";
console.warn("THREE.MD2Loader: As part of the transition to ES6 Modules, the files in 'examples/js' were deprecated in May 2020 (r117) and will be deleted in December 2020 (r124). You can find more information about developing using ES6 Modules in https://threejs.org/docs/#manual/en/introduction/Installation.");

THREE.MD2Loader = function (manager) {
  THREE.Loader.call(this, manager);
};

THREE.MD2Loader.prototype = _Object$assign(_Object$create(THREE.Loader.prototype), {
  constructor: THREE.MD2Loader,
  load: function load(url, onLoad, onProgress, onError) {
    var scope = this;
    var loader = new THREE.FileLoader(scope.manager);
    loader.setPath(scope.path);
    loader.setResponseType('arraybuffer');
    loader.setRequestHeader(scope.requestHeader);
    loader.load(url, function (buffer) {
      try {
        onLoad(scope.parse(buffer));
      } catch (e) {
        if (onError) {
          onError(e);
        } else {
          console.error(e);
        }

        scope.manager.itemError(url);
      }
    }, onProgress, onError);
  },
  parse: function () {
    var normalData = [[-0.525731, 0.000000, 0.850651], [-0.442863, 0.238856, 0.864188], [-0.295242, 0.000000, 0.955423], [-0.309017, 0.500000, 0.809017], [-0.162460, 0.262866, 0.951056], [0.000000, 0.000000, 1.000000], [0.000000, 0.850651, 0.525731], [-0.147621, 0.716567, 0.681718], [0.147621, 0.716567, 0.681718], [0.000000, 0.525731, 0.850651], [0.309017, 0.500000, 0.809017], [0.525731, 0.000000, 0.850651], [0.295242, 0.000000, 0.955423], [0.442863, 0.238856, 0.864188], [0.162460, 0.262866, 0.951056], [-0.681718, 0.147621, 0.716567], [-0.809017, 0.309017, 0.500000], [-0.587785, 0.425325, 0.688191], [-0.850651, 0.525731, 0.000000], [-0.864188, 0.442863, 0.238856], [-0.716567, 0.681718, 0.147621], [-0.688191, 0.587785, 0.425325], [-0.500000, 0.809017, 0.309017], [-0.238856, 0.864188, 0.442863], [-0.425325, 0.688191, 0.587785], [-0.716567, 0.681718, -0.147621], [-0.500000, 0.809017, -0.309017], [-0.525731, 0.850651, 0.000000], [0.000000, 0.850651, -0.525731], [-0.238856, 0.864188, -0.442863], [0.000000, 0.955423, -0.295242], [-0.262866, 0.951056, -0.162460], [0.000000, 1.000000, 0.000000], [0.000000, 0.955423, 0.295242], [-0.262866, 0.951056, 0.162460], [0.238856, 0.864188, 0.442863], [0.262866, 0.951056, 0.162460], [0.500000, 0.809017, 0.309017], [0.238856, 0.864188, -0.442863], [0.262866, 0.951056, -0.162460], [0.500000, 0.809017, -0.309017], [0.850651, 0.525731, 0.000000], [0.716567, 0.681718, 0.147621], [0.716567, 0.681718, -0.147621], [0.525731, 0.850651, 0.000000], [0.425325, 0.688191, 0.587785], [0.864188, 0.442863, 0.238856], [0.688191, 0.587785, 0.425325], [0.809017, 0.309017, 0.500000], [0.681718, 0.147621, 0.716567], [0.587785, 0.425325, 0.688191], [0.955423, 0.295242, 0.000000], [1.000000, 0.000000, 0.000000], [0.951056, 0.162460, 0.262866], [0.850651, -0.525731, 0.000000], [0.955423, -0.295242, 0.000000], [0.864188, -0.442863, 0.238856], [0.951056, -0.162460, 0.262866], [0.809017, -0.309017, 0.500000], [0.681718, -0.147621, 0.716567], [0.850651, 0.000000, 0.525731], [0.864188, 0.442863, -0.238856], [0.809017, 0.309017, -0.500000], [0.951056, 0.162460, -0.262866], [0.525731, 0.000000, -0.850651], [0.681718, 0.147621, -0.716567], [0.681718, -0.147621, -0.716567], [0.850651, 0.000000, -0.525731], [0.809017, -0.309017, -0.500000], [0.864188, -0.442863, -0.238856], [0.951056, -0.162460, -0.262866], [0.147621, 0.716567, -0.681718], [0.309017, 0.500000, -0.809017], [0.425325, 0.688191, -0.587785], [0.442863, 0.238856, -0.864188], [0.587785, 0.425325, -0.688191], [0.688191, 0.587785, -0.425325], [-0.147621, 0.716567, -0.681718], [-0.309017, 0.500000, -0.809017], [0.000000, 0.525731, -0.850651], [-0.525731, 0.000000, -0.850651], [-0.442863, 0.238856, -0.864188], [-0.295242, 0.000000, -0.955423], [-0.162460, 0.262866, -0.951056], [0.000000, 0.000000, -1.000000], [0.295242, 0.000000, -0.955423], [0.162460, 0.262866, -0.951056], [-0.442863, -0.238856, -0.864188], [-0.309017, -0.500000, -0.809017], [-0.162460, -0.262866, -0.951056], [0.000000, -0.850651, -0.525731], [-0.147621, -0.716567, -0.681718], [0.147621, -0.716567, -0.681718], [0.000000, -0.525731, -0.850651], [0.309017, -0.500000, -0.809017], [0.442863, -0.238856, -0.864188], [0.162460, -0.262866, -0.951056], [0.238856, -0.864188, -0.442863], [0.500000, -0.809017, -0.309017], [0.425325, -0.688191, -0.587785], [0.716567, -0.681718, -0.147621], [0.688191, -0.587785, -0.425325], [0.587785, -0.425325, -0.688191], [0.000000, -0.955423, -0.295242], [0.000000, -1.000000, 0.000000], [0.262866, -0.951056, -0.162460], [0.000000, -0.850651, 0.525731], [0.000000, -0.955423, 0.295242], [0.238856, -0.864188, 0.442863], [0.262866, -0.951056, 0.162460], [0.500000, -0.809017, 0.309017], [0.716567, -0.681718, 0.147621], [0.525731, -0.850651, 0.000000], [-0.238856, -0.864188, -0.442863], [-0.500000, -0.809017, -0.309017], [-0.262866, -0.951056, -0.162460], [-0.850651, -0.525731, 0.000000], [-0.716567, -0.681718, -0.147621], [-0.716567, -0.681718, 0.147621], [-0.525731, -0.850651, 0.000000], [-0.500000, -0.809017, 0.309017], [-0.238856, -0.864188, 0.442863], [-0.262866, -0.951056, 0.162460], [-0.864188, -0.442863, 0.238856], [-0.809017, -0.309017, 0.500000], [-0.688191, -0.587785, 0.425325], [-0.681718, -0.147621, 0.716567], [-0.442863, -0.238856, 0.864188], [-0.587785, -0.425325, 0.688191], [-0.309017, -0.500000, 0.809017], [-0.147621, -0.716567, 0.681718], [-0.425325, -0.688191, 0.587785], [-0.162460, -0.262866, 0.951056], [0.442863, -0.238856, 0.864188], [0.162460, -0.262866, 0.951056], [0.309017, -0.500000, 0.809017], [0.147621, -0.716567, 0.681718], [0.000000, -0.525731, 0.850651], [0.425325, -0.688191, 0.587785], [0.587785, -0.425325, 0.688191], [0.688191, -0.587785, 0.425325], [-0.955423, 0.295242, 0.000000], [-0.951056, 0.162460, 0.262866], [-1.000000, 0.000000, 0.000000], [-0.850651, 0.000000, 0.525731], [-0.955423, -0.295242, 0.000000], [-0.951056, -0.162460, 0.262866], [-0.864188, 0.442863, -0.238856], [-0.951056, 0.162460, -0.262866], [-0.809017, 0.309017, -0.500000], [-0.864188, -0.442863, -0.238856], [-0.951056, -0.162460, -0.262866], [-0.809017, -0.309017, -0.500000], [-0.681718, 0.147621, -0.716567], [-0.681718, -0.147621, -0.716567], [-0.850651, 0.000000, -0.525731], [-0.688191, 0.587785, -0.425325], [-0.587785, 0.425325, -0.688191], [-0.425325, 0.688191, -0.587785], [-0.425325, -0.688191, -0.587785], [-0.587785, -0.425325, -0.688191], [-0.688191, -0.587785, -0.425325]];
    return function (buffer) {
      var data = new DataView(buffer); // http://tfc.duke.free.fr/coding/md2-specs-en.html

      var header = {};
      var headerNames = ['ident', 'version', 'skinwidth', 'skinheight', 'framesize', 'num_skins', 'num_vertices', 'num_st', 'num_tris', 'num_glcmds', 'num_frames', 'offset_skins', 'offset_st', 'offset_tris', 'offset_frames', 'offset_glcmds', 'offset_end'];

      for (var i = 0; i < headerNames.length; i++) {
        header[headerNames[i]] = data.getInt32(i * 4, true);
      }

      if (header.ident !== 844121161 || header.version !== 8) {
        console.error('Not a valid MD2 file');
        return;
      }

      if (header.offset_end !== data.byteLength) {
        console.error('Corrupted MD2 file');
        return;
      } //


      var geometry = new THREE.BufferGeometry(); // uvs

      var uvsTemp = [];
      var offset = header.offset_st;

      for (var i = 0, l = header.num_st; i < l; i++) {
        var u = data.getInt16(offset + 0, true);
        var v = data.getInt16(offset + 2, true);
        uvsTemp.push(u / header.skinwidth, 1 - v / header.skinheight);
        offset += 4;
      } // triangles


      offset = header.offset_tris;
      var vertexIndices = [];
      var uvIndices = [];

      for (var i = 0, l = header.num_tris; i < l; i++) {
        vertexIndices.push(data.getUint16(offset + 0, true), data.getUint16(offset + 2, true), data.getUint16(offset + 4, true));
        uvIndices.push(data.getUint16(offset + 6, true), data.getUint16(offset + 8, true), data.getUint16(offset + 10, true));
        offset += 12;
      } // frames


      var translation = new THREE.Vector3();
      var scale = new THREE.Vector3();
      var string = [];
      var frames = [];
      offset = header.offset_frames;

      for (var i = 0, l = header.num_frames; i < l; i++) {
        scale.set(data.getFloat32(offset + 0, true), data.getFloat32(offset + 4, true), data.getFloat32(offset + 8, true));
        translation.set(data.getFloat32(offset + 12, true), data.getFloat32(offset + 16, true), data.getFloat32(offset + 20, true));
        offset += 24;

        for (var j = 0; j < 16; j++) {
          var character = data.getUint8(offset + j, true);
          if (character === 0) break;
          string[j] = character;
        }

        var frame = {
          name: String.fromCharCode.apply(null, string),
          vertices: [],
          normals: []
        };
        offset += 16;

        for (var j = 0; j < header.num_vertices; j++) {
          var x = data.getUint8(offset++, true);
          var y = data.getUint8(offset++, true);
          var z = data.getUint8(offset++, true);
          var n = normalData[data.getUint8(offset++, true)];
          x = x * scale.x + translation.x;
          y = y * scale.y + translation.y;
          z = z * scale.z + translation.z;
          frame.vertices.push(x, z, y); // convert to Y-up

          frame.normals.push(n[0], n[2], n[1]); // convert to Y-up
        }

        frames.push(frame);
      } // static


      var positions = [];
      var normals = [];
      var uvs = [];
      var verticesTemp = frames[0].vertices;
      var normalsTemp = frames[0].normals;

      for (var i = 0, l = vertexIndices.length; i < l; i++) {
        var vertexIndex = vertexIndices[i];
        var stride = vertexIndex * 3; //

        var x = verticesTemp[stride];
        var y = verticesTemp[stride + 1];
        var z = verticesTemp[stride + 2];
        positions.push(x, y, z); //

        var nx = normalsTemp[stride];
        var ny = normalsTemp[stride + 1];
        var nz = normalsTemp[stride + 2];
        normals.push(nx, ny, nz); //

        var uvIndex = uvIndices[i];
        stride = uvIndex * 2;
        var u = uvsTemp[stride];
        var v = uvsTemp[stride + 1];
        uvs.push(u, v);
      }

      geometry.setAttribute('position', new THREE.Float32BufferAttribute(positions, 3));
      geometry.setAttribute('normal', new THREE.Float32BufferAttribute(normals, 3));
      geometry.setAttribute('uv', new THREE.Float32BufferAttribute(uvs, 2)); // animation

      var morphPositions = [];
      var morphNormals = [];

      for (var i = 0, l = frames.length; i < l; i++) {
        var frame = frames[i];
        var attributeName = frame.name;

        if (frame.vertices.length > 0) {
          var positions = [];

          for (var j = 0, jl = vertexIndices.length; j < jl; j++) {
            var vertexIndex = vertexIndices[j];
            var stride = vertexIndex * 3;
            var x = frame.vertices[stride];
            var y = frame.vertices[stride + 1];
            var z = frame.vertices[stride + 2];
            positions.push(x, y, z);
          }

          var positionAttribute = new THREE.Float32BufferAttribute(positions, 3);
          positionAttribute.name = attributeName;
          morphPositions.push(positionAttribute);
        }

        if (frame.normals.length > 0) {
          var normals = [];

          for (var j = 0, jl = vertexIndices.length; j < jl; j++) {
            var vertexIndex = vertexIndices[j];
            var stride = vertexIndex * 3;
            var nx = frame.normals[stride];
            var ny = frame.normals[stride + 1];
            var nz = frame.normals[stride + 2];
            normals.push(nx, ny, nz);
          }

          var normalAttribute = new THREE.Float32BufferAttribute(normals, 3);
          normalAttribute.name = attributeName;
          morphNormals.push(normalAttribute);
        }
      }

      geometry.morphAttributes.position = morphPositions;
      geometry.morphAttributes.normal = morphNormals;
      geometry.morphTargetsRelative = false;
      geometry.animations = THREE.AnimationClip.CreateClipsFromMorphTargetSequences(frames, 10);
      return geometry;
    };
  }()
});