Cesium 热力图教程

热力图 · Heat Map · ▶ 在线运行案例

• 案例合集： 三维可视化功能案例（threehub.cn）
• 开源仓库github地址： https://github.com/z2586300277/three-cesium-examples
• 400个案例代码: 网盘链接

你将学到什么

• Cesium Viewer 初始化
• Cesium Entity 高层 API
• Cesium 影像图层
• Cesium 动态材质属性
• 热力图可视化

效果说明

热力或密度可视化，通常把数值映射到颜色/高度。入口在 setCesiumHeatmap。

核心概念

• Viewer 封装地球、相机、图层；可关闭 animation/timeline 等 UI 精简界面。
• Entity 加点线面、模型、标签；适合业务对象与交互。
• ImageryLayer 叠加 XYZ/WMTS/ArcGIS 等底图，imageryLayers.add/remove 管理。
• MaterialProperty 支持 CallbackProperty 时间动态材质。

实现步骤

• 初始化 Cesium.Viewer 与底图图层
• 添加 Entity / Primitive / DataSource 等业务对象
• 按需 camera.flyTo 定位视角

• 代码要点

  import {

  EllipsoidSurfaceAppearance,
  GeometryInstance,
  Material,
  Primitive,
  Rectangle,
  RectangleGeometry,
  SingleTileImageryProvider,
  ImageryLayer,
  ImageMaterialProperty,
  Entity
  } from "cesium";
  import * as Cesium from "cesium";

  / —————————————————-heatMap类———————————————– /
  var HeatmapConfig = {
  defaultRadius: 40,
  defaultRenderer: "canvas2d",
  defaultGradient: {
  0.25: "rgb(0,0,255)",
  0.55: "rgb(0,255,0)",
  0.85: "yellow",
  1.0: "rgb(255,0,0)",
  },
  defaultMaxOpacity: 1,
  defaultMinOpacity: 0,
  defaultBlur: 0.85,
  defaultXField: "x",
  defaultYField: "y",
  defaultValueField: "value",
  plugins: {},
  };
  var Store = (function StoreClosure() {
  var Store = function Store(config) {
  this._coordinator = {};
  this._data = [];
  this._radi = [];
  this._min = 0;
  this._max = 1;
  this._xField = config["xField"] || config.defaultXField;
  this._yField = config["yField"] || config.defaultYField;
  this._valueField = config["valueField"] || config.defaultValueField;

  if (config["radius"]) {
  this._cfgRadius = config["radius"];
  }
  };

  var defaultRadius = HeatmapConfig.defaultRadius;

  Store.prototype = {
  // when forceRender = false -> called from setData, omits renderall event
  _organiseData: function (dataPoint, forceRender) {
  var x = dataPoint[this._xField];
  var y = dataPoint[this._yField];
  var radi = this._radi;
  var store = this._data;
  var max = this._max;
  var min = this._min;
  var value = dataPoint[this._valueField] || 1;
  var radius = dataPoint.radius || this._cfgRadius || defaultRadius;

  if (!store[x]) {
  store[x] = [];
  radi[x] = [];
  }

  if (!store[x][y]) {
  store[x][y] = value;
  radi[x][y] = radius;
  } else {
  store[x][y] += value;
  }

  if (store[x][y] > max) {
  if (!forceRender) {
  this._max = store[x][y];
  } else {
  this.setDataMax(store[x][y]);
  }
  return false;
  } else {
  return {
  x: x,
  y: y,
  value: value,
  radius: radius,
  min: min,
  max: max,
  };
  }
  },
  _unOrganizeData: function () {
  var unorganizedData = [];
  var data = this._data;
  var radi = this._radi;

  for (var x in data) {
  for (var y in data[x]) {
  unorganizedData.push({
  x: x,
  y: y,
  radius: radi[x][y],
  value: data[x][y],
  });
  }
  }
  return {
  min: this._min,
  max: this._max,
  data: unorganizedData,
  };
  },
  _onExtremaChange: function () {
  this._coordinator.emit("extremachange", {
  min: this._min,
  max: this._max,
  });
  },
  addData: function () {
  if (arguments[0].length > 0) {
  var dataArr = arguments[0];
  var dataLen = dataArr.length;
  while (dataLen–) {
  this.addData.call(this, dataArr[dataLen]);
  }
  } else {
  // add to store
  var organisedEntry = this._organiseData(arguments[0], true);
  if (organisedEntry) {
  this._coordinator.emit("renderpartial", {
  min: this._min,
  max: this._max,
  data: [organisedEntry],
  });
  }
  }
  return this;
  },
  setData: function (data) {
  var dataPoints = data.data;
  var pointsLen = dataPoints.length;

  // reset data arrays
  this._data = [];
  this._radi = [];

  for (var i = 0; i < pointsLen; i++) {
  this._organiseData(dataPoints[i], false);
  }
  this._max = data.max;
  this._min = data.min || 0;

  this._onExtremaChange();
  this._coordinator.emit("renderall", this._getInternalData());
  return this;
  },
  removeData: function () {
  // TODO: implement
  },
  setDataMax: function (max) {
  this._max = max;
  this._onExtremaChange();
  this._coordinator.emit("renderall", this._getInternalData());
  return this;
  },
  setDataMin: function (min) {
  this._min = min;
  this._onExtremaChange();
  this._coordinator.emit("renderall", this._getInternalData());
  return this;
  },
  setCoordinator: function (coordinator) {
  this._coordinator = coordinator;
  },
  _getInternalData: function () {
  return {
  max: this._max,
  min: this._min,
  data: this._data,
  radi: this._radi,
  };
  },
  getData: function () {
  return this._unOrganizeData();
  } /*,

  TODO: rethink.

  getValueAt: function(point) {
  var value;
  var radius = 100;
  var x = point.x;
  var y = point.y;
  var data = this._data;

  if (data[x] && data[x][y]) {
  return data[x][y];
  } else {
  var values = [];
  // radial search for datapoints based on default radius
  for(var distance = 1; distance < radius; distance++) {
  var neighbors = distance * 2 +1;
  var startX = x – distance;
  var startY = y – distance;

  for(var i = 0; i < neighbors; i++) {
  for (var o = 0; o < neighbors; o++) {
  if ((i == 0 || i == neighbors-1) || (o == 0 || o == neighbors-1)) {
  if (data[startY+i] && data[startY+i][startX+o]) {
  values.push(data[startY+i][startX+o]);
  }
  } else {
  continue;
  }
  }
  }
  }
  if (values.length > 0) {
  return Math.max.apply(Math, values);
  }
  }
  return false;
  }*/,
  };

  return Store;
  })();

  var Canvas2dRenderer = (function Canvas2dRendererClosure() {
  var _getColorPalette = function (config) {
  var gradientConfig = config.gradient || config.defaultGradient;
  var paletteCanvas = document.createElement("canvas");
  var paletteCtx = paletteCanvas.getContext("2d");

  paletteCanvas.width = 256;
  paletteCanvas.height = 1;

  var gradient = paletteCtx.createLinearGradient(0, 0, 256, 1);
  for (var key in gradientConfig) {
  gradient.addColorStop(key, gradientConfig[key]);
  }

  paletteCtx.fillStyle = gradient;
  paletteCtx.fillRect(0, 0, 256, 1);

  return paletteCtx.getImageData(0, 0, 256, 1).data;
  };

  var _getPointTemplate = function (radius, blurFactor) {
  var tplCanvas = document.createElement("canvas");
  var tplCtx = tplCanvas.getContext("2d");
  var x = radius;
  var y = radius;
  tplCanvas.width = tplCanvas.height = radius * 2;

  if (blurFactor == 1) {
  tplCtx.beginPath();
  tplCtx.arc(x, y, radius, 0, 2 * Math.PI, false);
  tplCtx.fillStyle = "rgba(0,0,0,1)";
  tplCtx.fill();
  } else {
  var gradient = tplCtx.createRadialGradient(
  x,
  y,
  radius * blurFactor,
  x,
  y,
  radius
  );
  gradient.addColorStop(0, "rgba(0,0,0,1)");
  gradient.addColorStop(1, "rgba(0,0,0,0)");
  tplCtx.fillStyle = gradient;
  tplCtx.fillRect(0, 0, 2 radius, 2 radius);
  }

  return tplCanvas;
  };

  var _prepareData = function (data) {
  var renderData = [];
  var min = data.min;
  var max = data.max;
  var radi = data.radi;
  var data = data.data;

  var xValues = Object.keys(data);
  var xValuesLen = xValues.length;

  while (xValuesLen–) {
  var xValue = xValues[xValuesLen];
  var yValues = Object.keys(data[xValue]);
  var yValuesLen = yValues.length;
  while (yValuesLen–) {
  var yValue = yValues[yValuesLen];
  var value = data[xValue][yValue];
  var radius = radi[xValue][yValue];
  renderData.push({
  x: xValue,
  y: yValue,
  value: value,
  radius: radius,
  });
  }
  }

  return {
  min: min,
  max: max,
  data: renderData,
  };
  };

  function Canvas2dRenderer(config) {
  var container = config.container;
  var shadowCanvas = (this.shadowCanvas = document.createElement("canvas"));
  var canvas = (this.canvas =
  config.canvas || document.createElement("canvas"));
  var renderBoundaries = (this._renderBoundaries = [10000, 10000, 0, 0]);

  var computed = getComputedStyle(config.container) || {};

  canvas.className = "heatmap-canvas";

  this._width =
  canvas.width =
  shadowCanvas.width =
  +computed.width.replace(/px/, "");
  this._height =
  canvas.height =
  shadowCanvas.height =
  +computed.height.replace(/px/, "");

  this.shadowCtx = shadowCanvas.getContext("2d");
  this.ctx = canvas.getContext("2d");

  // @TODO:
  // conditional wrapper

  canvas.style.cssText = shadowCanvas.style.cssText =
  "position:absolute;left:0;top:0;";

  container.style.position = "relative";
  container.appendChild(canvas);

  this._palette = _getColorPalette(config);
  this._templates = {};

  this._setStyles(config);
  }

  Canvas2dRenderer.prototype = {
  renderPartial: function (data) {
  this._drawAlpha(data);
  this._colorize();
  },
  renderAll: function (data) {
  // reset render boundaries
  this._clear();
  this._drawAlpha(_prepareData(data));
  this._colorize();
  },
  _updateGradient: function (config) {
  this._palette = _getColorPalette(config);
  },
  updateConfig: function (config) {
  if (config["gradient"]) {
  this._updateGradient(config);
  }
  this._setStyles(config);
  },
  setDimensions: function (width, height) {
  this._width = width;
  this._height = height;
  this.canvas.width = this.shadowCanvas.width = width;
  this.canvas.height = this.shadowCanvas.height = height;
  },
  _clear: function () {
  this.shadowCtx.clearRect(0, 0, this._width, this._height);
  this.ctx.clearRect(0, 0, this._width, this._height);
  },
  _setStyles: function (config) {
  this._blur = config.blur == 0 ? 0 : config.blur || config.defaultBlur;

  if (config.backgroundColor) {
  this.canvas.style.backgroundColor = config.backgroundColor;
  }

  this._opacity = (config.opacity || 0) * 255;
  this._maxOpacity = (config.maxOpacity || config.defaultMaxOpacity) * 255;
  this._minOpacity = (config.minOpacity || config.defaultMinOpacity) * 255;
  this._useGradientOpacity = !!config.useGradientOpacity;
  },
  _drawAlpha: function (data) {
  var min = (this._min = data.min);
  var max = (this._max = data.max);
  var data = data.data || [];
  var dataLen = data.length;
  // on a point basis?
  var blur = 1 – this._blur;

  while (dataLen–) {
  var point = data[dataLen];

  var x = point.x;
  var y = point.y;
  var radius = point.radius;
  // if value is bigger than max
  // use max as value
  var value = Math.min(point.value, max);
  var rectX = x – radius;
  var rectY = y – radius;
  var shadowCtx = this.shadowCtx;

  var tpl;
  if (!this._templates[radius]) {
  this._templates[radius] = tpl = _getPointTemplate(radius, blur);
  } else {
  tpl = this._templates[radius];
  }
  // value from minimum / value range
  // => [0, 1]
  shadowCtx.globalAlpha = (value – min) / (max – min);

  shadowCtx.drawImage(tpl, rectX, rectY);

  // update renderBoundaries
  if (rectX < this._renderBoundaries[0]) {
  this._renderBoundaries[0] = rectX;
  }
  if (rectY < this._renderBoundaries[1]) {
  this._renderBoundaries[1] = rectY;
  }
  if (rectX + 2 * radius > this._renderBoundaries[2]) {
  this._renderBoundaries[2] = rectX + 2 * radius;
  }
  if (rectY + 2 * radius > this._renderBoundaries[3]) {
  this._renderBoundaries[3] = rectY + 2 * radius;
  }
  }
  },
  _colorize: function () {
  var x = this._renderBoundaries[0];
  var y = this._renderBoundaries[1];
  var width = this._renderBoundaries[2] – x;
  var height = this._renderBoundaries[3] – y;
  var maxWidth = this._width;
  var maxHeight = this._height;
  var opacity = this._opacity;
  var maxOpacity = this._maxOpacity;
  var minOpacity = this._minOpacity;
  var useGradientOpacity = this._useGradientOpacity;

  if (x < 0) {
  x = 0;
  }
  if (y < 0) {
  y = 0;
  }
  if (x + width > maxWidth) {
  width = maxWidth – x;
  }
  if (y + height > maxHeight) {
  height = maxHeight – y;
  }

  var img = this.shadowCtx.getImageData(x, y, width, height);
  var imgData = img.data;
  var len = imgData.length;
  var palette = this._palette;

  for (var i = 3; i < len; i += 4) {
  var alpha = imgData[i];
  var offset = alpha * 4;

  if (!offset) {
  continue;
  }

  var finalAlpha;
  if (opacity > 0) {
  finalAlpha = opacity;
  } else {
  if (alpha < maxOpacity) {
  if (alpha < minOpacity) {
  finalAlpha = minOpacity;
  } else {
  finalAlpha = alpha;
  }
  } else {
  finalAlpha = maxOpacity;
  }
  }

  imgData[i – 3] = palette[offset];
  imgData[i – 2] = palette[offset + 1];
  imgData[i – 1] = palette[offset + 2];
  imgData[i] = useGradientOpacity ? palette[offset + 3] : finalAlpha;
  }
  Object.defineProperty(img, "data", {
  value: imgData,
  writable: true,
  configurable: true,
  enumerable: true,
  });
  // img.data = imgData;
  this.ctx.putImageData(img, x, y);

  this._renderBoundaries = [1000, 1000, 0, 0];
  },
  getValueAt: function (point) {
  var value;
  var shadowCtx = this.shadowCtx;
  var img = shadowCtx.getImageData(point.x, point.y, 1, 1);
  var data = img.data[3];
  var max = this._max;
  var min = this._min;

  value = (Math.abs(max – min) * (data / 255)) >> 0;

  return value;
  },
  getDataURL: function () {
  return this.canvas.toDataURL();
  },
  };

  return Canvas2dRenderer;
  })();

  var Renderer = (function RendererClosure() {
  var rendererFn = false;

  if (HeatmapConfig["defaultRenderer"] === "canvas2d") {
  rendererFn = Canvas2dRenderer;
  }

  return rendererFn;
  })();

  var Util = {
  merge: function () {
  var merged = {};
  var argsLen = arguments.length;
  for (var i = 0; i < argsLen; i++) {
  var obj = arguments[i];
  for (var key in obj) {
  merged[key] = obj[key];
  }
  }
  return merged;
  },
  };
  // Heatmap Constructor
  var Heatmap = (function HeatmapClosure() {
  var Coordinator = (function CoordinatorClosure() {
  function Coordinator() {
  this.cStore = {};
  }

  Coordinator.prototype = {
  on: function (evtName, callback, scope) {
  var cStore = this.cStore;

  if (!cStore[evtName]) {
  cStore[evtName] = [];
  }
  cStore[evtName].push(function (data) {
  return callback.call(scope, data);
  });
  },
  emit: function (evtName, data) {
  var cStore = this.cStore;
  if (cStore[evtName]) {
  var len = cStore[evtName].length;
  for (var i = 0; i < len; i++) {
  var callback = cStore[evtName][i];
  callback(data);
  }
  }
  },
  };

  return Coordinator;
  })();

  var _connect = function (scope) {
  var renderer = scope._renderer;
  var coordinator = scope._coordinator;
  var store = scope._store;

  coordinator.on("renderpartial", renderer.renderPartial, renderer);
  coordinator.on("renderall", renderer.renderAll, renderer);
  coordinator.on("extremachange", function (data) {
  scope._config.onExtremaChange &&
  scope._config.onExtremaChange({
  min: data.min,
  max: data.max,
  gradient:
  scope._config["gradient"] || scope._config["defaultGradient"],
  });
  });
  store.setCoordinator(coordinator);
  };

  function Heatmap() {
  var config = (this._config = Util.merge(HeatmapConfig, arguments[0] || {}));
  this._coordinator = new Coordinator();
  if (config["plugin"]) {
  var pluginToLoad = config["plugin"];
  if (!HeatmapConfig.plugins[pluginToLoad]) {
  throw new Error(
  "Plugin '" +
  pluginToLoad +
  "' not found. Maybe it was not registered."
  );
  } else {
  var plugin = HeatmapConfig.plugins[pluginToLoad];
  // set plugin renderer and store
  this._renderer = new plugin.renderer(config);
  this._store = new plugin.store(config);
  }
  } else {
  this._renderer = new Renderer(config);
  this._store = new Store(config);
  }
  _connect(this);
  }

  // @TODO:
  // add API documentation
  Heatmap.prototype = {
  addData: function () {
  this._store.addData.apply(this._store, arguments);
  return this;
  },
  removeData: function () {
  this._store.removeData &&
  this._store.removeData.apply(this._store, arguments);
  return this;
  },
  setData: function () {
  this._store.setData.apply(this._store, arguments);
  return this;
  },
  setDataMax: function () {
  this._store.setDataMax.apply(this._store, arguments);
  return this;
  },
  setDataMin: function () {
  this._store.setDataMin.apply(this._store, arguments);
  return this;
  },
  configure: function (config) {
  this._config = Util.merge(this._config, config);
  this._renderer.updateConfig(this._config);
  this._coordinator.emit("renderall", this._store._getInternalData());
  return this;
  },
  repaint: function () {
  this._coordinator.emit("renderall", this._store._getInternalData());
  return this;
  },
  getData: function () {
  return this._store.getData();
  },
  getDataURL: function () {
  return this._renderer.getDataURL();
  },
  getValueAt: function (point) {
  if (this._store.getValueAt) {
  return this._store.getValueAt(point);
  } else if (this._renderer.getValueAt) {
  return this._renderer.getValueAt(point);
  } else {
  return null;
  }
  },
  };

  return Heatmap;
  })();

  var h337 = {
  create: function (config) {
  return new Heatmap(config);
  },
  register: function (pluginKey, plugin) {
  HeatmapConfig.plugins[pluginKey] = plugin;
  },
  };
  / —————————————————-heatMap类————————————————— /

  class setCesiumHeatmap {
  constructor(viewer, options) {
  this.viewer = viewer;
  this.initOptions = { …options };
  if (this.initOptions?.points) {
  const bounds = this.getBounds(this.initOptions.points);
  this.bounds = bounds;
  const { container, width, height } = this.createContainer(bounds);
  this.element = container;
  const datas = [];
  const values = [];
  for (let i in this.initOptions.points) {
  const point = this.initOptions.points[i];
  const x = ((point.x – bounds[0]) / (bounds[2] – bounds[0])) * width; //屏幕坐标x
  const y = ((bounds[3] – point.y) / (bounds[3] – bounds[1])) * height; //屏幕坐标y
  const dataPoint = {
  x: x,
  y: y,
  value: point.value,
  };
  if (typeof point.value === "number") values.push(point.value);
  datas.push(dataPoint);
  }

  //数据的最大值和最小值
  let _min = Math.min(…values),
  _max = Math.max(…values);
  if (this.initOptions?.heatmapDataOptions) {
  const { min, max } = this.initOptions.heatmapDataOptions;
  if (typeof min === "number") {
  _min = min;
  }
  if (typeof max === "number") {
  _max = max;
  }
  }
  this.heatmapDataOptions = { min: _min, max: _max };

  const data = {
  max: _max,
  min: _min,
  data: datas,
  };

  const defaultOptions = {
  maxOpacity: 0.9,
  // radius: minRadius,
  // minimum opacity. any value > 0 will produce
  // no transparent gradient transition
  minOpacity: 0.1,
  gradient: {
  // enter n keys between 0 and 1 here
  // for gradient color customization
  ".3": "blue",
  ".5": "green",
  ".7": "yellow",
  ".95": "red",
  },
  };
  const _options = this.initOptions.heatmapOptions
  ? { …defaultOptions, …this.initOptions.heatmapOptions }
  : defaultOptions;

  //初始化半径
  if (this.heatmapOptions?.radius) {
  this.initRadius = this.heatmapOptions.radius;
  }

  this.heatmapOptions = { …_options };
  const options = {
  …_options,
  container,
  };
  this.heatmap = h337.create(options);
  this.heatmap.setData(data);
  this.createLayer();

  if (!this.initOptions.noLisenerCamera) {
  this.addLisener();
  }

  if (this.initOptions.zoomToLayer && bounds) {
  this.viewer.camera.flyTo({
  destination: Rectangle.fromDegrees(…bounds),
  });
  }

  if (this.initOptions?.viewToLayer) {
  this.viewer.camera.setView({
  destination: Rectangle.fromDegrees(…bounds),
  });
  }
  }
  }

  /**

  • 设置数据的最大最小值
  • @param dataOption

  */
  updateHeatMapMaxMin(dataOption) {
  const { min, max } = dataOption;
  if (this.heatmap) {
  if (typeof min === "number") {
  this.heatmap.setDataMin(min);
  if (this.heatmapDataOptions) this.heatmapDataOptions.min = min;
  }
  if (typeof max === "number") {
  this.heatmap.setDataMax(max);
  if (this.heatmapDataOptions) this.heatmapDataOptions.max = max;
  }
  }
  this.updateLayer();
  }

  /**

  • 更新热度图配置
  • @param options

  */
  updateHeatmap(options) {
  const { heatmapOptions } = this;
  this.heatmap.configure({ …heatmapOptions, …options });
  this.updateLayer();
  }

  /**

  • 更新半径
  • @param radius

  */
  updateRadius(radius) {
  const { heatmapOptions } = this;
  const currentData = this.heatmap.getData();
  if (currentData?.data) {
  for (let i in currentData.data) {
  const data = currentData.data[i];
  data.radius = radius;
  }
  }
  this.heatmap.setData(currentData);
  this.heatmapOptions = { …heatmapOptions, …{ radius } };
  this.updateLayer();
  if (this.initOptions?.onRadiusChange) {
  this.initOptions.onRadiusChange(radius);
  }
  }

  /**

  • 移除

  */
  remove() {
  if (this.element) {
  document.body.removeChild(this.element);
  this.element = undefined;
  if (this.provider instanceof ImageryLayer) {
  if (this.provider) this.viewer.imageryLayers.remove(this.provider);
  this.createSingleTileImageryLayer();
  } else if (this.provider instanceof Primitive) {
  this.viewer.scene.primitives.remove(this.provider);
  } else if (this.provider instanceof Entity) {
  this.viewer.entities.remove(this.provider);
  }
  if (this.cameraMoveEnd) {
  this.viewer.camera.moveEnd.removeEventListener(this.cameraMoveEnd);
  this.cameraMoveEnd = undefined;
  }
  }
  }

  createLayer() {
  if (this.initOptions.renderType === "primitive") {
  this.createPrimitive();
  } else if (this.initOptions.renderType === "imagery") {
  this.createSingleTileImageryLayer();
  } else {
  this.createEntity();
  }
  }

  createPrimitive() {
  const url = this.heatmap.getDataURL();
  this.provider = this.viewer.scene.primitives.add(
  new Primitive({
  geometryInstances: new GeometryInstance({
  geometry: new RectangleGeometry({
  rectangle: Rectangle.fromDegrees(…this.bounds),
  vertexFormat: EllipsoidSurfaceAppearance.VERTEX_FORMAT,
  }),
  }),
  appearance: new EllipsoidSurfaceAppearance({
  aboveGround: false,
  }),
  show: true,
  })
  );
  if (this.provider) {
  this.provider.appearance.material = new Material({
  fabric: {
  type: "Image",
  uniforms: {
  image: url,
  },
  },
  });
  }
  }

  createSingleTileImageryLayer() {
  const url = this.heatmap.getDataURL();
  this.provider = this.viewer.imageryLayers.addImageryProvider(
  new SingleTileImageryProvider({
  url: url,
  rectangle: Rectangle.fromDegrees(…this.bounds),
  })
  );
  }

  getImageMaterialProperty() {
  const url = this.heatmap.getDataURL();
  const material = new ImageMaterialProperty({
  image: url,
  });
  return material;
  }

  createEntity() {
  this.provider = this.viewer.entities.add({
  show: true,
  rectangle: {
  coordinates: Rectangle.fromDegrees(…this.bounds),
  material: this.getImageMaterialProperty(),
  },
  });
  }

  updateLayer() {
  const src = this.heatmap.getDataURL();
  if (this.provider instanceof ImageryLayer) {
  if (this.provider) this.viewer.imageryLayers.remove(this.provider);
  this.createSingleTileImageryLayer();
  } else if (this.provider instanceof Primitive) {
  this.provider.appearance.material.uniforms.image = src;
  } else if (this.provider instanceof Entity) {
  if (this.provider.rectangle)
  this.provider.rectangle.material = this.getImageMaterialProperty();
  }
  }

  /**

  • 添加相机的监听

  */
  addLisener() {
  const maxRadius = 100;
  const min = 6375000;
  const max = 10000000;
  this.cameraMoveEnd = () => {
  if (this.heatmapOptions && this.heatmap && this.heatmapDataOptions) {
  const h = this.viewer.camera.getMagnitude();
  const distance = this?.initOptions?.cameraHeightDistance
  ? this.initOptions.cameraHeightDistance
  : 1000;
  if (Math.abs(h – this.lastCameraHeight) > distance) {
  this.lastCameraHeight = h;
  if (typeof min === "number" && typeof max === "number") {
  const radius = parseInt(
  (
  this.initRadius +
  ((maxRadius – this.initRadius) * (h – min)) / (max – min)
  ).toFixed(0)
  );
  if (radius) {
  this.updateRadius(radius);
  }
  }
  }
  }
  };
  this.viewer.camera.moveEnd.addEventListener(this.cameraMoveEnd);
  }

  /**

  • * @param points
  • @param expand
  • @returns

  */
  getBounds(points) {
  if (points) {
  let lonMin = 180;
  let lonMax = -180;
  let latMin = 90;
  let latMax = -180;
  points.forEach(function (point) {
  const { x: longitude, y: latitude } = point;
  lonMin = longitude < lonMin ? longitude : lonMin;
  latMin = latitude < latMin ? latitude : latMin;
  lonMax = longitude > lonMax ? longitude : lonMax;
  latMax = latitude > latMax ? latitude : latMax;
  });
  const xRange = lonMax – lonMin ? lonMax – lonMin : 1;
  const yRange = latMax – latMin ? latMax – latMin : 1;
  return [
  lonMin – xRange / 10,
  latMin – yRange / 10,
  lonMax + xRange / 10,
  latMax + yRange / 10,
  ];
  }
  return [0, 0, 0, 0];
  }

  createContainer(bounds) {
  const container = document.createElement("div");
  const width = 1000;
  const height = parseInt(
  ((1000 / (bounds[2] – bounds[0])) * (bounds[3] – bounds[1])).toFixed(0)
  );
  container.setAttribute(
  "style",
  width:${width}px;height:${height}px;display:none;
  );
  document.body.appendChild(container);
  return { container, width, height };
  }
  }

  const DOM = document.getElementById('box')

  const viewer = new Cesium.Viewer(DOM, {

  animation: false,//是否创建动画小器件，左下角仪表

  baseLayerPicker: false,//是否显示图层选择器，右上角图层选择按钮

  baseLayer: Cesium.ImageryLayer.fromProviderAsync(Cesium.ArcGisMapServerImageryProvider.fromUrl('https://server.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer')),

  fullscreenButton: false,//是否显示全屏按钮，右下角全屏选择按钮

  timeline: false,//是否显示时间轴

  infoBox: false,//是否显示信息框

  })

  viewer._cesiumWidget._creditContainer.style.display = "none"

  // 模拟数值
  const points = new Array(50).fill('').map(() => {

  return {

  x: 116.46 + Math.random() * 10,

  y: 39.92 + Math.random() * 10,

  value: Math.random()

  }

  })

  // 创建热力图
  new setCesiumHeatmap(viewer, {

  points,

  viewToLayer: true,

  heatmapDataOptions: { max: 1, min: 0 },

  heatmapOptions: {

  radius: 100,

  maxOpacity: 0.5,

  minOpacity: 0

  }

  })

  完整源码：GitHub

  小结

  • 本文提供 热力图 完整 Cesium.js 源码与在线 Demo，建议先运行案例再改 uniform/参数做二次实验
  • 更多 Cesium.js 实战案例见 three-cesium-examples 合集 与 GitHub 开源仓库