• cesium中添加热力图示例，引用heatmap.min.js后可调用。解决用heatmap绘出的canvas贴到cesium的rectangle上会有黑色背景的问题。
• 利用javaScript技术，根据json文件数据在地图上绘制热力图进行展示。
• 一、热力图效果图 二、核心代码 // 模拟热力图坐标范围及核心代码 loadCesiumHeatMapFun(){ let tmpXYList = [ new Cesium.Cartographic(111.2300232,39.5279085, 0), new Cesium.Cartographic(111....

## 二、核心代码

// 模拟热力图坐标范围及核心代码
let tmpXYList = [
new Cesium.Cartographic(111.2300232,39.5279085, 0),
new Cesium.Cartographic(111.2300178,39.5256063, 0),
new Cesium.Cartographic(111.198801,39.5256635, 0),
new Cesium.Cartographic(111.1988154,39.527964, 0),
]

//生成矩形
var bound = new Cesium.Rectangle.fromCartographicArray(tmpXYList)
// 随机生成矩形范围内的点坐标
let tPoints = turf.randomPoint(Number(this.xyList), {bbox: [bound.west, bound.south, bound.east, bound.north]})
var searchWithin = turf.polygon([[
[111.2300232,39.5279085],
[111.2300178,39.5256063],
[111.198801,39.5256635],
[111.1988154,39.527964],
[111.2300232,39.5279085]
]]);
// 返回多边形内的所有点
var ptsWithin = turf.pointsWithinPolygon(tPoints, searchWithin);

let tmpMarksList = []
let heatMax = 0
let heatPoints = []
tmpXYList.forEach( xy => {
this.sampleHeightsCoordinate([xy.longitude,xy.latitude],3,(posi) => {
tmpMarksList.push(posi)
})
})

// 对随机生成的点添加value值
ptsWithin.features.forEach(dl => {
var val = Math.floor(Math.random() * 100);
heatMax = Math.max(heatMax, val);
let coord = dl.geometry.coordinates
var point = {
x: coord[0],
y: coord[1],
value: val
};
heatPoints.push(point);
})

let temTime = setInterval(() => {
if(ptsWithin.features.length === heatPoints.length && tmpXYList.length === tmpMarksList.length){
heatMap1 ? '' : heatMap1 = window.CesiumHeatmap.create(cesiumHeatViewer,bound,tmpMarksList,{ // heatmap相应参数
maxOpacity: .6,
minOpacity: 0,
blur: .75,
'0.95':'red',
'0.85':'orange',
'0.75':'yellow',
'0.55':'blue',
'0.3':'green',
},
})
let valueMin = 0;
heatMap1.setWGS84Data(valueMin, heatMax, heatPoints);

clearInterval(temTime)
}
}, 120);
}

## 三、完整代码

<template>
<div id="CesiumHeatMapDiv" v-if="cesiumHeatMapIsShow">
<table style="text-align: right;">
<tr>
<td colspan="2" style="text-align: left">
<span style="font-size: 18px; font-weight: 600;">模拟热力图</span>
<div class="closeCesiumHeatMap" @click="handCloserCesiumHeatMap"></div>
</td>
</tr>
<tr>
<td colspan="2">
<div
style="height: 4px;background-color: rgba(29,164,220,0.6);margin: 4px;"
></div>
</td>
</tr>
<tr>
<td>坐标数量：</td>
<td>
<el-input-number
class="inputNumWidth"
v-model="xyList"
:max="99999"
:min="5000"
:step="5000"
@change="handlxlChange"
></el-input-number>
</td>
</tr>
<tr>
<td colspan="2">
<el-button size="mini" @click="clearCesiumHeatMap">清除</el-button>
</td>
</tr>
</table>
</div>
</template>
<script>
import * as turf from '@turf/turf'
import CesiumHeatmap from "../../../../../static/cesium-heatmap/CesiumHeatmap";

let cesiumHeatViewer = undefined
let heatMap1 = undefined
let timeInterval = undefined

export default {
name: "cesiumHeatMap",
data() {
return {
cesiumHeatMapIsShow: false,
isDrawCesiumHeatMap: false,
xyList: 5000,
};
},
methods: {
handlxlChange(){
},

/**
* @description: 组件调用入口方法
*/
openCesiumHeatMap(viewer) {
cesiumHeatViewer = viewer
this.cesiumHeatMapIsShow = true;
},

handCloserCesiumHeatMap() {
this.cesiumHeatMapIsShow = false;
cesiumHeatViewer = undefined
this.clearCesiumHeatMap()
},

this.clearCesiumHeatMap()
this.isDrawCesiumHeatMap = true

timeInterval = setInterval(() => {
}, 5000);
},

// 模拟代码
let tmpXYList = [
new Cesium.Cartographic(111.2300232,39.5279085, 0),
new Cesium.Cartographic(111.2300178,39.5256063, 0),
new Cesium.Cartographic(111.198801,39.5256635, 0),
new Cesium.Cartographic(111.1988154,39.527964, 0),
]

//生成矩形
var bound = new Cesium.Rectangle.fromCartographicArray(tmpXYList)
// 随机生成矩形范围内的点坐标
let tPoints = turf.randomPoint(Number(this.xyList), {bbox: [bound.west, bound.south, bound.east, bound.north]})
var searchWithin = turf.polygon([[
[111.2300232,39.5279085],
[111.2300178,39.5256063],
[111.198801,39.5256635],
[111.1988154,39.527964],
[111.2300232,39.5279085]
]]);
// 返回多边形内的所有点
var ptsWithin = turf.pointsWithinPolygon(tPoints, searchWithin);

let tmpMarksList = []
let heatMax = 0
let heatPoints = []
tmpXYList.forEach( xy => {
this.sampleHeightsCoordinate([xy.longitude,xy.latitude],3,(posi) => {
tmpMarksList.push(posi)
})
})

// 对随机生成的点添加value值
ptsWithin.features.forEach(dl => {
var val = Math.floor(Math.random() * 100);
heatMax = Math.max(heatMax, val);
let coord = dl.geometry.coordinates
var point = {
x: coord[0],
y: coord[1],
value: val
};
heatPoints.push(point);
})

let temTime = setInterval(() => {
if(ptsWithin.features.length === heatPoints.length && tmpXYList.length === tmpMarksList.length){
heatMap1 ? '' : heatMap1 = window.CesiumHeatmap.create(cesiumHeatViewer,bound,tmpMarksList,{ // heatmap相应参数
maxOpacity: .6,
minOpacity: 0,
blur: .75,
'0.95':'red',
'0.85':'orange',
'0.75':'yellow',
'0.55':'blue',
'0.3':'green',
},
})
let valueMin = 0;
heatMap1.setWGS84Data(valueMin, heatMax, heatPoints);

clearInterval(temTime)
}
}, 120);
},

clearCesiumHeatMap(){
this.isDrawCesiumHeatMap = false
if(heatMap1) {
heatMap1._layer ? heatMap1._cesium.entities.remove(heatMap1._layer) : ''
heatMap1._layer = undefined
}
clearInterval(timeInterval)
},

sampleHeightsCoordinate(coordinate, height,callback) {
const positions = [
Cesium.Cartographic.fromDegrees(coordinate[0], coordinate[1]),
]
cesiumHeatViewer.scene.sampleHeightMostDetailed(positions).then(function (clampedCartesians) {
const posi = Cesium.Cartesian3.fromDegrees(coordinate[0], coordinate[1], clampedCartesians[0].height + height)
callback(posi)
})
}
}
};
</script>

<style lang="scss" scoped>
.closeCesiumHeatMap {
text-decoration: none;
position: absolute;
top: 20px;
right: 10px;
z-index: 20;
}
.closeCesiumHeatMap:after {
// content: "✖";
content: "\e60b";
font-family: "iconfont";
font-size: 22px;
color: rgba($color: gray,$alpha: 0.8);
}

#CesiumHeatMapDiv {
color: rgba(29, 164, 220, 0.9);
background: rgba(34, 69, 91, 0.7);

.closeCesiumHeatMap {
top: 1vh;
right: 0.6vw;
cursor: pointer;
}

/deep/ .inputNumWidth {
width: 140px;
.el-input__inner {
height: 28px;
line-height: 28px;
background: #104c66bd;
color: #cef2ff;
font-size: 12px;
border: 0px;
}
.el-input-number__decrease,
.el-input-number__increase {
background: #104c66;
color: rgba(255, 255, 255, 0.8);
border-right: 0px;
border-left: 0px;
font-size: 14px;
top: 4px;
}
}

/deep/ .el-button {
background: rgba(18, 167, 204, 0.52);
color: #cef2ff;
border: 0px;
}
}

#CesiumHeatMapDiv td {
}
</style>

## 四、CesiumHeatmap 修改后源码下载

CesiumHeatmap 资源链接

展开全文
• 创建热力图要将引入heat.js 创建热力点heatpoints function createHeatMap() { const data = [ { longitude: 106.695302, latitude: 26.516131, count: 10 }, { longitude: 106.683302, latitude: 26.512131,...

创建热力图要将引入heat.js

创建热力点heatpoints

function createHeatMap() {
const data = [
{ longitude: 106.695302, latitude: 26.516131, count: 10 },
{ longitude: 106.683302, latitude: 26.512131, count: 50 },
{ longitude: 106.683502, latitude: 26.514131, count: 20 },
{ longitude: 106.688302, latitude: 26.512131, count: 10 }
]
var min = 0
var max = 0
const heatpoints = []
// for (var feature of data) {
if (feature.longitude && feature.latitude) {
max = Math.max(max, feature.count)
min = Math.min(min, feature.count)
heatpoints.push({
x: parseFloat(feature.longitude),
y: parseFloat(feature.latitude),
value: feature.count
})
}
// }
}

根据最大最小值创建热力图

debugger
// 创建一个矩形，包围要做热力的区域
const features = [
{ longitude: 106.6555543649391, latitude: 26.48334149757955 },
{ longitude: 106.68732179894454, latitude: 26.564155190537694 },
{ longitude: 106.72079820833973, latitude: 26.4917484358577 },
{ longitude: 106.72023263982003, latitude: 26.499988040091054 }
]
const points = []
const bpoint = []
for (const coord of features) {
points.push(coord.longitude, coord.latitude)
bpoint.push(new Cesium.Cartographic(coord.longitude, coord.latitude, 0))
}
// eslint-disable-next-line new-cap
// 根据数据计算范围
const bound = new Cesium.Rectangle.fromCartographicArray(bpoint)
// eslint-disable-next-line no-undef
const heatMap = CesiumHeatmap.create(
viewer,
bound,
{
// heatmap相应参数
backgroundColor: 'rgba(0,0,0,0)',
maxOpacity: 0.5,
minOpacity: 0,
blur: 0.85
}
)

heatMap.setWGS84Data(min, max, heatPoints)
const img = heatMap._heatmap._renderer.canvas
polygon: {
hierarchy: Cesium.Cartesian3.fromDegreesArray(points), // 多边形
material: new Cesium.ImageMaterialProperty({
image: img
})
}
})
heatmapPolygon.push(entity)
}

创建结果

展开全文
• Cesium 热力图代码
• Cesium热力图代码
• 原理：使用heatmap.js插件，先生成一个热力图，再在地图上创建一个盒子（如矩形），以纹理的形式把热力图填充到矩形中。 1、首先下载heatmap.js插件，自己随意写了一个热力图的方法，传入热力图所需参数max和data ...

原理：使用heatmap.js插件，先生成一个热力图，再在地图上创建一个盒子（如矩形），以纹理的形式把热力图填充到矩形中。

1、首先下载heatmap.js插件，自己随意写了一个热力图的方法，传入热力图所需参数max和data

// 创建热力图
function createHeatMap(max, data) {
// 创建元素
var heatDoc = document.createElement("div");
heatDoc.setAttribute("style", "width:1000px;height:1000px;margin: 0px;display: none;");
document.body.appendChild(heatDoc);
// 创建热力图对象
var heatmap = h337.create({
container: heatDoc,
maxOpacity: .5,
minOpacity: 0,
blur: .75,
'0.9':'red',
'0.8':'orange',
'0.7':'yellow',
'0.5':'blue',
'0.3':'green',
},
});
// 添加数据
heatmap.setData({
max: max,
data: data
});
return heatmap;
}

2、创建一个cesium视图对象

var viewer = new Cesium.Viewer("viewer");

3、在之前建的cesium视图中，创建一个矩形（也可是椭圆、正方形、多边形等），在矩形内以纹理的形式填充，自己随意封装了一个方法

// 创建正方形 绑定热力图
function createRectangle(viewer, coordinate, heatMap) {
name: 'Rotating rectangle with rotating texture coordinate',
show: true,
rectangle: {
coordinates: Cesium.Rectangle.fromDegrees(coordinate[0], coordinate[1], coordinate[2], coordinate[3]),
material: heatMap._renderer.canvas // 核心语句，填充热力图
}
});
}

4、随意生成多个点数据

// 生成len个随机数据
function getData(len) {
//构建一些随机数据点
var points = [];
var max = 0;
var width = 1000;
var height = 1000;
while (len--) {
var val = Math.floor(Math.random() * 1000);
max = Math.max(max, val);
var point = {
x: Math.floor(Math.random() * width),
y: Math.floor(Math.random() * height),
value: val
};
points.push(point);
}
return {max: max, data: points}
}

5、使用上述方法，则生成热力图

// 第一个热力图
var coordinate1 = [-109.0, 10.0, -80.0, 35.0];
var heatMap1 = createHeatMap(getData(1000).max, getData(1000).data);
creatRectangle(viewer, coordinate1, heatMap1);

// 第二个热力图
var coordinate2 = [-109.0, 30.0, -80.0, 41.0];
var heatMap2 = createHeatMap(getData(3000).max, getData(3000).data);
creatRectangle(viewer, coordinate2, heatMap2);

// 第三个热力图
var coordinate3 = [-109.0, 41.0, -80.0, 50.0];
var heatMap3 = createHeatMap(getData(5000).max, getData(5000).data);
creatRectangle(viewer, coordinate3, heatMap3);

6、效果如下，因为数据都是随意添加的，所以效果不好，但是可以体现出能在cesium中实现热力图

展开全文
• 1.效果 2.实现代码 <!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name=...

### 2.实现代码

<!DOCTYPE html>
<html>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
<title>Cesium 热力图</title>
<script src="Cesium/Cesium.js"></script>
<script src="lib/CesiumHeatmap.js"></script>
<script src="http://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<style>
html,
body,
#cesiumContainer {
width: 100%;
height: 100%;
margin: 0;
overflow: hidden;
}
.btnDiv{
position: absolute;
top: 0;
}
.btn{
height: 40px;
width: 100px;
}
</style>
<body>
<div id="cesiumContainer" class="fullSize"></div>
<div class="btnDiv">
<button class="btn" id="remove">删除</button>
</div>
<script>
var esri = new Cesium.ArcGisMapServerImageryProvider({
url: 'https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer',
enablePickFeatures: false
});
var _self = this
var viewer = new Cesium.Viewer('cesiumContainer', {
imageryProvider: esri,
contextOptions: {
webgl: {
alpha: true
}
},
selectionIndicator: false,
animation: false, //是否显示动画控件
baseLayerPicker: false, //是否显示图层选择控件
geocoder: false, //是否显示地名查找控件
timeline: false, //是否显示时间线控件
sceneModePicker: true, //是否显示投影方式控件
infoBox: false, //是否显示点击要素之后显示的信息
fullscreenButton: true
});

// 初始化一个矩形坐标
var bounds = {
west: -109.0,
south: 30.0,
east: -80.0,
north: 50.0
};
//初始化cesiumheatmap对象，传入相应的参数
this.heatMap = window.CesiumHeatmap.create(
viewer, // 视图层
bounds, // 矩形坐标
{ // heatmap相应参数
backgroundColor: "rgba(0,0,0,0)",
maxOpacity: .5,
minOpacity: 0,
blur: .75
}
);
// random example data 添加数据 最小值，最大值，数据集
let data = [{"x":147.1383442264,"y":-41.4360048372,"value":76},{"x":147.1384363011,"y":-41.4360298848,"value":63},{"x":147.138368102,"y":-41.4358360603,"value":1},{"x":147.1385627739,"y":-41.4358799123,"value":21},{"x":147.1385138501,"y":-41.4359327669,"value":28},{"x":147.1385031219,"y":-41.4359730105,"value":41},{"x":147.1384127393,"y":-41.435928255,"value":75},{"x":147.1384551136,"y":-41.4359450132,"value":3},{"x":147.1384927196,"y":-41.4359158649,"value":45},{"x":147.1384938639,"y":-41.4358498311,"value":45},{"x":147.1385183299,"y":-41.4360213794,"value":93},{"x":147.1384007925,"y":-41.4359860133,"value":46},{"x":147.1383604844,"y":-41.4358298672,"value":54},{"x":147.13851025,"y":-41.4359098303,"value":39},{"x":147.1383874733,"y":-41.4358511035,"value":34},{"x":147.1384981796,"y":-41.4359355403,"value":81},{"x":147.1384504107,"y":-41.4360332348,"value":39},{"x":147.1385582664,"y":-41.4359788335,"value":20},{"x":147.1383967364,"y":-41.4360581999,"value":35},{"x":147.1383839615,"y":-41.436016316,"value":47},{"x":147.1384082712,"y":-41.4358423338,"value":36},{"x":147.1385092651,"y":-41.4358577623,"value":69},{"x":147.138360356,"y":-41.436046789,"value":90},{"x":147.138471893,"y":-41.4359184292,"value":88},{"x":147.1385605689,"y":-41.4360271359,"value":81},{"x":147.1383585714,"y":-41.4359362476,"value":32},{"x":147.1384939114,"y":-41.4358844253,"value":67},{"x":147.138466724,"y":-41.436019121,"value":17},{"x":147.1385504355,"y":-41.4360614056,"value":49},{"x":147.1383883832,"y":-41.4358733544,"value":82},{"x":147.1385670669,"y":-41.4359650236,"value":25},{"x":147.1383416534,"y":-41.4359310876,"value":82},{"x":147.138525285,"y":-41.4359394661,"value":66},{"x":147.1385487719,"y":-41.4360137656,"value":73},{"x":147.1385496029,"y":-41.4359187277,"value":73},{"x":147.1383989222,"y":-41.4358556562,"value":61},{"x":147.1385499424,"y":-41.4359149305,"value":67},{"x":147.138404523,"y":-41.4359563326,"value":90},{"x":147.1383883675,"y":-41.4359794855,"value":78},{"x":147.1383967187,"y":-41.435891185,"value":15},{"x":147.1384610005,"y":-41.4359044797,"value":15},{"x":147.1384688489,"y":-41.4360396127,"value":91},{"x":147.1384431875,"y":-41.4360684409,"value":8},{"x":147.1385411067,"y":-41.4360645847,"value":42},{"x":147.1385237178,"y":-41.4358843181,"value":31},{"x":147.1384406464,"y":-41.4360003831,"value":51},{"x":147.1384679169,"y":-41.4359950456,"value":96},{"x":147.1384194314,"y":-41.4358419739,"value":22},{"x":147.1385049792,"y":-41.4359574813,"value":44},{"x":147.1384097378,"y":-41.4358598672,"value":82},{"x":147.1384993219,"y":-41.4360352975,"value":84},{"x":147.1383640499,"y":-41.4359839518,"value":81}];

let valueMin = 0;
let valueMax = 100;

// heatMap.setWGS84Data(valueMin, valueMax, data);
var a, b;
// 动态数据 [{x: -97.6433525165054, y: 45.61443064377248, value: 11.409122369106317}]

function getData(length) {
var data = [];
for (var i = 0; i < length; i++) {
var x = Math.random() * (-109 + 80) - 80;
var y = Math.random() * (50 - 30) + 30;
var value = Math.random() * 100;
data.push({
x: x,
y: y,
value: value
});
a = x;
b = y;
}
return data;
}
//添加场景切换
viewer.camera.setView({
destination: Cesium.Cartesian3.fromDegrees(90.43,147.13,10000000)
});

//获取动态数据
this.heatMap.setWGS84Data(valueMin, valueMax, getData(300));
}

$("#add").on("click",function(){ addHeatMap() })$("#remove").on("click",function(){
viewer.entities.remove(_self.heatMap._layer);
})
</script>
</body>
</html>

### 3.CesiumHeatmap.js

/*
*  CesiumHeatmap.js v0.1 | Cesium Heatmap Library
*
*  Works with heatmap.js v2.0.0: http://www.patrick-wied.at/static/heatmapjs/
*/
(function (window) {
'use strict';

function define_CesiumHeatmap() {
var CesiumHeatmap = {
defaults: {
useEntitiesIfAvailable: true, //whether to use entities if a Viewer is supplied or always use an ImageryProvider
minCanvasSize: 700,           // minimum size (in pixels) for the heatmap canvas
maxCanvasSize: 2000,          // maximum size (in pixels) for the heatmap canvas
radiusFactor: 60,             // data point size factor used if no radius is given (the greater of height and width divided by this number yields the used radius)
spacingFactor: 1.5,           // extra space around the borders (point radius multiplied by this number yields the spacing)
maxOpacity: 0.8,              // the maximum opacity used if not given in the heatmap options object
minOpacity: 0.1,              // the minimum opacity used if not given in the heatmap options object
blur: 0.85,                   // the blur used if not given in the heatmap options object
gradient: {                   // the gradient used if not given in the heatmap options object
'.3': 'blue',
'.65': 'yellow',
'.8': 'orange',
'.95': 'red'
},
}
};

/*  Create a CesiumHeatmap instance
*
*  cesium:  the CesiumWidget or Viewer instance
*  bb:      the WGS84 bounding box like {north, east, south, west}
*  options: a heatmap.js options object (see http://www.patrick-wied.at/static/heatmapjs/docs.html#h337-create)
*/
CesiumHeatmap.create = function (cesium, bb, options) {
var instance = new CHInstance(cesium, bb, options);
return instance;
};

CesiumHeatmap._getContainer = function (width, height, id) {
var c = document.createElement("div");
if (id) {
c.setAttribute("id", id);
}
c.setAttribute("style", "width: " + width + "px; height: " + height + "px; margin: 0px; display: none;");
document.body.appendChild(c);
return c;
};

CesiumHeatmap._getImageryProvider = function (instance) {
//var n = (new Date()).getTime();
var d = instance._heatmap.getDataURL();
//console.log("Create data URL: " + ((new Date()).getTime() - n));

//var n = (new Date()).getTime();
var imgprov = new Cesium.SingleTileImageryProvider({
url: d,
rectangle: instance._rectangle
});
//console.log("Create imageryprovider: " + ((new Date()).getTime() - n));

imgprov._tilingScheme = new Cesium.WebMercatorTilingScheme({
rectangleSouthwestInMeters: new Cesium.Cartesian2(instance._mbounds.west, instance._mbounds.south),
rectangleNortheastInMeters: new Cesium.Cartesian2(instance._mbounds.east, instance._mbounds.north)
});

return imgprov;
};

CesiumHeatmap._getID = function (len) {
var text = "";
var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

for (var i = 0; i < ((len) ? len : 8); i++)
text += possible.charAt(Math.floor(Math.random() * possible.length));

return text;
};

var Cesium = window.Cesium;
var WMP = new Cesium.WebMercatorProjection();

/*  Convert a WGS84 location into a mercator location
*
*  p: the WGS84 location like {x: lon, y: lat}
*/
CesiumHeatmap.wgs84ToMercator = function (p) {
var mp = WMP.project(Cesium.Cartographic.fromDegrees(p.x, p.y));
return {
x: mp.x,
y: mp.y
};
};

/*  Convert a WGS84 bounding box into a mercator bounding box
*
*  bb: the WGS84 bounding box like {north, east, south, west}
*/
CesiumHeatmap.wgs84ToMercatorBB = function (bb) {
var sw = WMP.project(Cesium.Cartographic.fromDegrees(bb.west, bb.south));
var ne = WMP.project(Cesium.Cartographic.fromDegrees(bb.east, bb.north));
return {
north: ne.y,
east: ne.x,
south: sw.y,
west: sw.x
};
};

/*  Convert a mercator location into a WGS84 location
*
*  p: the mercator lcation like {x, y}
*/
CesiumHeatmap.mercatorToWgs84 = function (p) {
var wp = WMP.unproject(new Cesium.Cartesian3(p.x, p.y));
return {
x: wp.longitude,
y: wp.latitude
};
};

/*  Convert a mercator bounding box into a WGS84 bounding box
*
*  bb: the mercator bounding box like {north, east, south, west}
*/
CesiumHeatmap.mercatorToWgs84BB = function (bb) {
var sw = WMP.unproject(new Cesium.Cartesian3(bb.west, bb.south));
var ne = WMP.unproject(new Cesium.Cartesian3(bb.east, bb.north));
return {
};
};

*
*  d: the degrees to be converted to radians
*/
var r = d * (Math.PI / 180.0);
return r;
};

*
*  r: the radians to be converted to degrees
*/
var d = r / (Math.PI / 180.0);
return d;
};

return CesiumHeatmap;
}

if (typeof(CesiumHeatmap) === 'undefined') {
window.CesiumHeatmap = define_CesiumHeatmap(window.Cesium);
} else {
}
})(window);

/*  Initiate a CesiumHeatmap instance
*
*  c:  CesiumWidget instance
*  bb: a WGS84 bounding box like {north, east, south, west}
*  o:  a heatmap.js options object (see http://www.patrick-wied.at/static/heatmapjs/docs.html#h337-create)
*/
function CHInstance(c, bb, o) {
if (!bb) {
return null;
}
if (!o) {
o = {};
}

this._cesium = c;
this._options = o;
this._id = CesiumHeatmap._getID();

this._options.maxOpacity = ((this._options.maxOpacity) ? this._options.maxOpacity : CesiumHeatmap.defaults.maxOpacity);
this._options.minOpacity = ((this._options.minOpacity) ? this._options.minOpacity : CesiumHeatmap.defaults.minOpacity);
this._options.blur = ((this._options.blur) ? this._options.blur : CesiumHeatmap.defaults.blur);

this._mbounds = CesiumHeatmap.wgs84ToMercatorBB(bb);
this._setWidthAndHeight(this._mbounds);

this._xoffset = this._mbounds.west;
this._yoffset = this._mbounds.south;

this.width = Math.round(this.width + this._spacing * 2);
this.height = Math.round(this.height + this._spacing * 2);

this._mbounds.west -= this._spacing * this._factor;
this._mbounds.east += this._spacing * this._factor;
this._mbounds.south -= this._spacing * this._factor;
this._mbounds.north += this._spacing * this._factor;

this.bounds = CesiumHeatmap.mercatorToWgs84BB(this._mbounds);

this._rectangle = Cesium.Rectangle.fromDegrees(this.bounds.west, this.bounds.south, this.bounds.east, this.bounds.north);
this._container = CesiumHeatmap._getContainer(this.width, this.height, this._id);
this._options.container = this._container;
this._heatmap = h337.create(this._options);
this._container.children[0].setAttribute("id", this._id + "-hm");
}

/*  Convert a WGS84 location to the corresponding heatmap location
*
*  p: a WGS84 location like {x:lon, y:lat}
*/
CHInstance.prototype.wgs84PointToHeatmapPoint = function (p) {
return this.mercatorPointToHeatmapPoint(CesiumHeatmap.wgs84ToMercator(p));
};

/*  Convert a mercator location to the corresponding heatmap location
*
*  p: a WGS84 location like {x: lon, y:lat}
*/
CHInstance.prototype.mercatorPointToHeatmapPoint = function (p) {
var pn = {};

pn.x = Math.round((p.x - this._xoffset) / this._factor + this._spacing);
pn.y = Math.round((p.y - this._yoffset) / this._factor + this._spacing);
pn.y = this.height - pn.y;

return pn;
};

CHInstance.prototype._setWidthAndHeight = function (mbb) {
this.width = ((mbb.east > 0 && mbb.west < 0) ? mbb.east + Math.abs(mbb.west) : Math.abs(mbb.east - mbb.west));
this.height = ((mbb.north > 0 && mbb.south < 0) ? mbb.north + Math.abs(mbb.south) : Math.abs(mbb.north - mbb.south));
this._factor = 1;

if (this.width > this.height && this.width > CesiumHeatmap.defaults.maxCanvasSize) {
this._factor = this.width / CesiumHeatmap.defaults.maxCanvasSize;

if (this.height / this._factor < CesiumHeatmap.defaults.minCanvasSize) {
this._factor = this.height / CesiumHeatmap.defaults.minCanvasSize;
}
} else if (this.height > this.width && this.height > CesiumHeatmap.defaults.maxCanvasSize) {
this._factor = this.height / CesiumHeatmap.defaults.maxCanvasSize;

if (this.width / this._factor < CesiumHeatmap.defaults.minCanvasSize) {
this._factor = this.width / CesiumHeatmap.defaults.minCanvasSize;
}
} else if (this.width < this.height && this.width < CesiumHeatmap.defaults.minCanvasSize) {
this._factor = this.width / CesiumHeatmap.defaults.minCanvasSize;

if (this.height / this._factor > CesiumHeatmap.defaults.maxCanvasSize) {
this._factor = this.height / CesiumHeatmap.defaults.maxCanvasSize;
}
} else if (this.height < this.width && this.height < CesiumHeatmap.defaults.minCanvasSize) {
this._factor = this.height / CesiumHeatmap.defaults.minCanvasSize;

if (this.width / this._factor > CesiumHeatmap.defaults.maxCanvasSize) {
this._factor = this.width / CesiumHeatmap.defaults.maxCanvasSize;
}
}

this.width = this.width / this._factor;
this.height = this.height / this._factor;
};

/*  Set an array of heatmap locations
*
*  min:  the minimum allowed value for the data values
*  max:  the maximum allowed value for the data values
*  data: an array of data points in heatmap coordinates and values like {x, y, value}
*/
CHInstance.prototype.setData = function (min, max, data) {
if (data && data.length > 0 && min !== null && min !== false && max !== null && max !== false) {
this._heatmap.setData({
min: min,
max: max,
data: data
});

this.updateLayer();
return true;
}

return false;
};

/*  Set an array of WGS84 locations
*
*  min:  the minimum allowed value for the data values
*  max:  the maximum allowed value for the data values
*  data: an array of data points in WGS84 coordinates and values like { x:lon, y:lat, value }
*/
CHInstance.prototype.setWGS84Data = function (min, max, data) {
if (data && data.length > 0 && min !== null && min !== false && max !== null && max !== false) {
var convdata = [];

for (var i = 0; i < data.length; i++) {
var gp = data[i];

var hp = this.wgs84PointToHeatmapPoint(gp);
if (gp.value || gp.value === 0) {
hp.value = gp.value;
}

convdata.push(hp);
}

return this.setData(min, max, convdata);
}

return false;
};

/*  Set whether or not the heatmap is shown on the map
*
*  s: true means the heatmap is shown, false means the heatmap is hidden
*/
CHInstance.prototype.show = function (s) {
if (this._layer) {
this._layer.show = s;
}
};

/*  Update/(re)draw the heatmap
*/
CHInstance.prototype.updateLayer = function () {

// only works with a Viewer instance since the cesiumWidget
// instance doesn't contain an entities property
if (CesiumHeatmap.defaults.useEntitiesIfAvailable && this._cesium.entities) {
if (this._layer) {
this._cesium.entities.remove(this._layer);
}

// Work around issue with material rendering in Cesium
// provided by https://github.com/criis
material = new Cesium.ImageMaterialProperty({
image: this._heatmap._renderer.canvas,
});
if (Cesium.VERSION >= "1.21") {
material.transparent = true;
} else if (Cesium.VERSION >= "1.16") {
material.alpha = 0.99;
}

show: true,
rectangle: {
coordinates: this._rectangle,
material: material
}
});
} else {
if (this._layer) {
this._cesium.scene.imageryLayers.remove(this._layer);
}

}
};

/*  DON'T TOUCH:
*
*  heatmap.js v2.0.0 | JavaScript Heatmap Library: http://www.patrick-wied.at/static/heatmapjs/
*
*
*  :: 2014-10-31 21:16
*/
(function (a, b, c) {
//	if (typeof module !== "undefined" && module.exports) {
//		module.exports = c()
//	} else if (typeof define === "function" && define.amd) {
//		define(c)
//	} else {
//		b[a] = c()
//	}
b[a] = c();
})("h337", this, function () {
var a = {
defaultRenderer: "canvas2d",
defaultGradient: {.25: "rgb(0,0,255)", .55: "rgb(0,255,0)", .85: "yellow", 1: "rgb(255,0,0)"},
defaultMaxOpacity: 1,
defaultMinOpacity: 0,
defaultBlur: .85,
defaultXField: "x",
defaultYField: "y",
defaultValueField: "value",
plugins: {}
};
var b = function h() {
var b = function d(a) {
this._coordinator = {};
this._data = [];
this._min = 0;
this._max = 1;
this._xField = a["xField"] || a.defaultXField;
this._yField = a["yField"] || a.defaultYField;
this._valueField = a["valueField"] || a.defaultValueField;
}
};
b.prototype = {
_organiseData: function (a, b) {
var d = a[this._xField];
var e = a[this._yField];
var g = this._data;
var h = this._max;
var i = this._min;
var j = a[this._valueField] || 1;
if (!g[d]) {
g[d] = [];
f[d] = []
}
if (!g[d][e]) {
g[d][e] = j;
f[d][e] = k
} else {
g[d][e] += j
}
if (g[d][e] > h) {
if (!b) {
this._max = g[d][e]
} else {
this.setDataMax(g[d][e])
}
return false
} else {
return {x: d, y: e, value: j, radius: k, min: i, max: h}
}
}, _unOrganizeData: function () {
var a = [];
var b = this._data;
for (var d in b) {
for (var e in b[d]) {
a.push({x: d, y: e, radius: c[d][e], value: b[d][e]})
}
}
return {min: this._min, max: this._max, data: a}
}, _onExtremaChange: function () {
this._coordinator.emit("extremachange", {min: this._min, max: this._max})
if (arguments[0].length > 0) {
var a = arguments[0];
var b = a.length;
while (b--) {
}
} else {
var c = this._organiseData(arguments[0], true);
if (c) {
this._coordinator.emit("renderpartial", {min: this._min, max: this._max, data: [c]})
}
}
return this
}, setData: function (a) {
var b = a.data;
var c = b.length;
this._data = [];
for (var d = 0; d < c; d++) {
this._organiseData(b[d], false)
}
this._max = a.max;
this._min = a.min || 0;
this._onExtremaChange();
this._coordinator.emit("renderall", this._getInternalData());
return this
}, removeData: function () {
}, setDataMax: function (a) {
this._max = a;
this._onExtremaChange();
this._coordinator.emit("renderall", this._getInternalData());
return this
}, setDataMin: function (a) {
this._min = a;
this._onExtremaChange();
this._coordinator.emit("renderall", this._getInternalData());
return this
}, setCoordinator: function (a) {
this._coordinator = a
}, _getInternalData: function () {
}, getData: function () {
return this._unOrganizeData()
}
};
return b
}();
var c = function i() {
var a = function (a) {
var c = document.createElement("canvas");
var d = c.getContext("2d");
c.width = 256;
c.height = 1;
var e = d.createLinearGradient(0, 0, 256, 1);
for (var f in b) {
}
d.fillStyle = e;
d.fillRect(0, 0, 256, 1);
return d.getImageData(0, 0, 256, 1).data
};
var b = function (a, b) {
var c = document.createElement("canvas");
var d = c.getContext("2d");
var e = a;
var f = a;
c.width = c.height = a * 2;
if (b == 1) {
d.beginPath();
d.arc(e, f, a, 0, 2 * Math.PI, false);
d.fillStyle = "rgba(0,0,0,1)";
d.fill()
} else {
d.fillStyle = g;
d.fillRect(0, 0, 2 * a, 2 * a)
}
return c
};
var c = function (a) {
var b = [];
var c = a.min;
var d = a.max;
var a = a.data;
var f = Object.keys(a);
var g = f.length;
while (g--) {
var h = f[g];
var i = Object.keys(a[h]);
var j = i.length;
while (j--) {
var k = i[j];
var l = a[h][k];
var m = e[h][k];
b.push({x: h, y: k, value: l, radius: m})
}
}
return {min: c, max: d, data: b}
};

function d(b) {
var c = b.container;
var d = this.shadowCanvas = document.createElement("canvas");
var e = this.canvas = b.canvas || document.createElement("canvas");
var f = this._renderBoundaries = [1e4, 1e4, 0, 0];
var g = getComputedStyle(b.container) || {};
e.className = "heatmap-canvas";
this._width = e.width = d.width = +g.width.replace(/px/, "");
this._height = e.height = d.height = +g.height.replace(/px/, "");
this.ctx = e.getContext("2d");
e.style.cssText = d.style.cssText = "position:absolute;left:0;top:0;";
c.style.position = "relative";
c.appendChild(e);
this._palette = a(b);
this._templates = {};
this._setStyles(b)
}

d.prototype = {
renderPartial: function (a) {
this._drawAlpha(a);
this._colorize()
}, renderAll: function (a) {
this._clear();
this._drawAlpha(c(a));
this._colorize()
this._palette = a(b)
}, updateConfig: function (a) {
}
this._setStyles(a)
}, setDimensions: function (a, b) {
this._width = a;
this._height = b;
}, _clear: function () {
this.ctx.clearRect(0, 0, this._width, this._height)
}, _setStyles: function (a) {
this._blur = a.blur == 0 ? 0 : a.blur || a.defaultBlur;
if (a.backgroundColor) {
this.canvas.style.backgroundColor = a.backgroundColor
}
this._opacity = (a.opacity || 0) * 255;
this._maxOpacity = (a.maxOpacity || a.defaultMaxOpacity) * 255;
this._minOpacity = (a.minOpacity || a.defaultMinOpacity) * 255;
}, _drawAlpha: function (a) {
var c = this._min = a.min;
var d = this._max = a.max;
var a = a.data || [];
var e = a.length;
var f = 1 - this._blur;
while (e--) {
var g = a[e];
var h = g.x;
var i = g.y;
var k = Math.min(g.value, d);
var l = h - j;
var m = i - j;
var o;
if (!this._templates[j]) {
this._templates[j] = o = b(j, f)
} else {
o = this._templates[j]
}
n.globalAlpha = (k - c) / (d - c);
n.drawImage(o, l, m);
if (l < this._renderBoundaries[0]) {
this._renderBoundaries[0] = l
}
if (m < this._renderBoundaries[1]) {
this._renderBoundaries[1] = m
}
if (l + 2 * j > this._renderBoundaries[2]) {
this._renderBoundaries[2] = l + 2 * j
}
if (m + 2 * j > this._renderBoundaries[3]) {
this._renderBoundaries[3] = m + 2 * j
}
}
}, _colorize: function () {
var a = this._renderBoundaries[0];
var b = this._renderBoundaries[1];
var c = this._renderBoundaries[2] - a;
var d = this._renderBoundaries[3] - b;
var e = this._width;
var f = this._height;
var g = this._opacity;
var h = this._maxOpacity;
var i = this._minOpacity;
if (a < 0) {
a = 0
}
if (b < 0) {
b = 0
}
if (a + c > e) {
c = e - a
}
if (b + d > f) {
d = f - b
}
var k = this.shadowCtx.getImageData(a, b, c, d);
var l = k.data;
var m = l.length;
var n = this._palette;
for (var o = 3; o < m; o += 4) {
var p = l[o];
var q = p * 4;
if (!q) {
continue
}
var r;
if (g > 0) {
r = g
} else {
if (p < h) {
if (p < i) {
r = i
} else {
r = p
}
} else {
r = h
}
}
l[o - 3] = n[q];
l[o - 2] = n[q + 1];
l[o - 1] = n[q + 2];
l[o] = j ? n[q + 3] : r
}
k.data = l;
this.ctx.putImageData(k, a, b);
this._renderBoundaries = [1e3, 1e3, 0, 0]
}, getValueAt: function (a) {
var b;
var d = c.getImageData(a.x, a.y, 1, 1);
var e = d.data[3];
var f = this._max;
var g = this._min;
b = Math.abs(f - g) * (e / 255) >> 0;
return b
}, getDataURL: function () {
return this.canvas.toDataURL()
}
};
return d
}();
var d = function j() {
var b = false;
if (a["defaultRenderer"] === "canvas2d") {
b = c
}
return b
}();
var e = {
merge: function () {
var a = {};
var b = arguments.length;
for (var c = 0; c < b; c++) {
var d = arguments[c];
for (var e in d) {
a[e] = d[e]
}
}
return a
}
};
var f = function k() {
var c = function h() {
function a() {
this.cStore = {}
}

a.prototype = {
on: function (a, b, c) {
var d = this.cStore;
if (!d[a]) {
d[a] = []
}
d[a].push(function (a) {
return b.call(c, a)
})
}, emit: function (a, b) {
var c = this.cStore;
if (c[a]) {
var d = c[a].length;
for (var e = 0; e < d; e++) {
var f = c[a][e];
f(b)
}
}
}
};
return a
}();
var f = function (a) {
var b = a._renderer;
var c = a._coordinator;
var d = a._store;
c.on("renderpartial", b.renderPartial, b);
c.on("renderall", b.renderAll, b);
c.on("extremachange", function (b) {
a._config.onExtremaChange && a._config.onExtremaChange({
min: b.min,
max: b.max,
})
});
d.setCoordinator(c)
};

function g() {
var g = this._config = e.merge(a, arguments[0] || {});
this._coordinator = new c;
if (g["plugin"]) {
var h = g["plugin"];
if (!a.plugins[h]) {
throw new Error("Plugin '" + h + "' not found. Maybe it was not registered.")
} else {
var i = a.plugins[h];
this._renderer = new i.renderer(g);
this._store = new i.store(g)
}
} else {
this._renderer = new d(g);
this._store = new b(g)
}
f(this)
}

g.prototype = {
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 (a) {
this._config = e.merge(this._config, a);
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 (a) {
if (this._store.getValueAt) {
return this._store.getValueAt(a)
} else if (this._renderer.getValueAt) {
return this._renderer.getValueAt(a)
} else {
return null
}
}
};
return g
}();
var g = {
create: function (a) {
return new f(a)
}, register: function (b, c) {
a.plugins[b] = c
}
};
return g
});

展开全文
• 引入CesiumHeatmap.js <!DOCTYPE html> <html lang="en"> ...script src="../Build/Cesium/Cesium.js"></script> <script src="CesiumHeatmap.js"></script> <style>
• ## Cesium热力图实现

万次阅读 2017-05-14 10:01:46
生成热力图的算法我是用的一个热力图插件 heatmap.js。 heatmap中热力图生成原理： heatmap中首先会根据输入的渐进色参数，在内部生成一个0-255色值的调色板。 var _getColorPalette = function...
• ## cesium热力图（cesiumheatmap.js）

千次阅读 热门讨论 2018-06-28 16:27:08
无意中看到有个大神写了一个cesiumheatmap.js，顾名思义，就是在cesium框架中实现热力图原理是创建矩形，用heatmap.js生成一个canvas，再将canvas贴到矩形中这位大神将热力图的canvas大小通过传入的矩形坐标生成，将...
• // init heatmap let heatMap = CesiumHeatmap.create( myViewer, // your cesium viewer bounds, // bounds for heatmap layer { // heatmap.js options go here // maxOpacity: 0.3 } ); // random example data ...
• Cesium模型热力图效果 效果 详情参见 Cesium实战项目
• ## Cesium系列：热力图

千次阅读 2020-01-14 09:05:15
Cesium上根据点，可以显示出热力图，在网上有开源的代码，具体的参考网址如下： https://github.com/danwild/CesiumHeatmap 使用方式如下： function testLoc(){ //设定热力图的四至范围 let bounds = { ...
• 对于热力图，在我们的GIS业务中经常用到，二维的leaflet、openlayers都有成熟的案例，对于Cesium，在进行热力图功能研发的时候发现前辈造好的轮子，由于刚处在Cesium学习阶段，对于我们初学者非常友好了，...
• ## Cesium-热力图实现

千次阅读 2020-04-14 23:27:55
cesium热力图,heatmap.js,cesium-heatmap
• vue+js:Heatmap 热力图实现，亲测可用，依赖Heatmap.js插件，下载后添加引用即可。
• ## cesium中实现热力图

千次阅读 2020-07-06 14:44:12
原理：使用heatmap.js插件，先生成一个热力图，再在地图上创建一个盒子（如矩形），以纹理的形式把热力图填充到矩形中。 1、首先下载heatmap.js插件，自己随意写了一个热力图的方法，传入热力图所需参数max和data...
• 效果 1.首先引入CesiumHeatmap.js，CesiumHeatmap.js,地址不要积分。 2.地图初始化 var viewer = new Cesium.Viewer("csiumContain", { homeButton: true,//是否显示Home按钮 animation: false,//是否显示动画...
• Cesium|xt3d热力图效果代码预览地址 效果 代码 <!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial...
• ## 在cesium中实现热力图

千次阅读 热门讨论 2018-06-14 16:42:32
刚开始接触cesium，说实话，对于像我这类的小白来说，要想快速上手，确实有一定的难度，但是站在巨人的... 1、首先下载heatmap.js插件，自己随意写了一个热力图的方法，传入热力图所需参数max和data// 创建热力图 f...
• 热力图中每一个点可以拥有的最大值(超出这个值则和这个值相等) 最小值(min) 热力图中每一个点可以拥有的最小值(低于这个值则忽略改点) 如何绘制 使用热力图插件 heatmap.js： heatmap中首先会根
• 本文介绍如何在Cesium中展示热力图。目前比较常用的热力图插件是heatmap.js，实现的原理是使用heatmap.js生成热力图后，再将图贴到Cesium的相应位置。 准备工作： 1. 首先下载heatmap.js插件，官网地址：...
• ## [cesium] 绘制热力图

千次阅读 2019-07-13 20:19:52
效果 代码 ... * @CesiumHeatmap CesiumHeatmap热力图 * @CesiumHeatmapGL CesiumHeatmapGL热力图 * @dataType wfs geojson * @version v1 */ var cesiumHeatMap = (function (){...
• geojson生成热力图cesium加载 转载至：http://blog.sina.com.cn/s/blog_15e866bbe0102yysr.html 先说原理：创建canvas，遍历json文件中的坐标生成热点，把生成的图片弄到canvas上。 上面那位博主的js文件已经做了...

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