r - rmarkdown 中的传单热图 [英] r - leaflet heatmap in rmarkdown

问题描述

问题

您能否在 rmarkdown 文档中绘制

我有一个 这个在闪亮中工作的例子 使用tags$ 和 HTML().

rmarkdown 块

使用 Ramnath 在 R Markdown 中嵌入 rCharts 的示例 我可以接近在降价文档中创建它，但是当它运行时它显示地图，但不显示热量.

```{r heatMapMarkdown, results='asis', comment=NA, cache=F}## 参考# - http://bl.ocks.org/ramnathv/raw/8084330/- 在 R Markdown 中嵌入 rCharts图书馆(rCharts)数据 <- data.frame(经度 = c(-122.3809, -122.3269, -122.3342, -122.2984, -122.3044, -122.2754),纬度 = c(47.66796,47.63436,47.57665,47.71930,47.60616,47.55392),强度 = c(10,20,30,40,50,300))## 为热图创建 JSON## - 也可以使用 jsonlite::toJSONj <- paste0("[",dat[,"Latitude"], ",", dat[,"Longitude"], ",", dat[,"intensity"], "]", collapse=",")j <- paste0("[",j,"]")Leaf_map <- Leaflet$new()Leaf_map$setView(c(47.5982623,-122.3415519), zoom=10)Leaf_map$tileLayer(provider="Acetate.terrain")## 添加圆圈:# Leaf_map$marker(c(47.5982623, -122.3415519))Leaf_map$addAssets(jshead = c("http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js"))Leaf_map$setTemplate(afterScript = sprintf("<脚本>var addressPoints = %svar heat = L.heatLayer(addressPoints).addTo(map)", j))## 显示地图，但不显示热量...Leaf_map$print('iframesrc', include_assets=TRUE, cdn=TRUE)``

是否可以让热量"也显示在地图上?

解决方案

我想出了这个问题的答案 How to向 R Markdown 添加交互式可视化

首先，我为 部分创建了一个 html 文档，以将 src 包含到热图插件中，并保存它在与我的 .Rmd 文件相同的目录中，名称为 include_js_heatmap.html

<script src="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.js"></script><风格>#map { 宽度:800px;高度:600px；}body { font: 16px/1.4 "Helvetica Neue", Arial, sans-serif;}.ghbtns { 位置:相对；顶部:4px；左边距:5px；}{ 颜色:#0077ff;}</风格><script src = "http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js"></script>

然后我可以在 .Rmd 的标题中include this，并将生成热图的 html 直接写入文档正文中.

为了使热具有交互性，我可以在代码块中构造热点的 JSON，然后使用 r ... 将其包含在文档正文中符号

---标题:热图RMarkdown输出:html_document:自包含:假keep_md: 真包括:in_header: "include_js_heatmap.html"---```{r}数据 <- data.frame(经度 = c(-122.3809, -122.3269, -122.3342, -122.2984, -122.3044, -122.2754),纬度 = c(47.66796,47.63436,47.57665,47.71930,47.60616,47.55392),强度 = c(100,20,30,400,50,3))j <- paste0("[",dat[,"Latitude"], ",", dat[,"Longitude"], ",", dat[,"intensity"], "]", collapse=",")j <- paste0("[",j,"]")``<div id="地图"></div><script src="http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js"></script><脚本>var map = L.map('map').setView([47.5982623,-122.3415519], 12);vartiles = L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {归属:'&copy;<a href="http://osm.org/copyright">OpenStreetMap</a>贡献者，}).addTo(map);地址点 = `r j` ;var heat = L.heatLayer(addressPoints).addTo(map);

更新

<div ...> 方法将在 .Rmd 文件旁边创建一个目录，其中包含各种 .html、.js, .css 文件在其中.一旦创建完成，标准的 rCharts 代码将不再需要

html 代码:

## 创建传单地图Leaf_map <- Leaflet$new()Leaf_map$setView(c(47.5982623,-122.3415519), zoom=10)Leaf_map$tileLayer(provider="Acetate.terrain")## 添加热图插件Leaf_map$addAssets(jshead = c("http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js"))##热图层Leaf_map$setTemplate(afterScript = sprintf("<脚本>var addressPoints = %svar heat = L.heatLayer(addressPoints).addTo(map)", j))##输出地图叶图

更新 2

避免 include 的一个轻微变化是直接在 .Rmd 文档中使用所有相关的 html:

```{r baseMap, results='asis', echo=FALSE, comment=NA, cache=FALSE}图书馆(rCharts)数据 <- data.frame(经度 = c(-122.3809, -122.3269, -122.3342, -122.2984, -122.3044, -122.2754),纬度 = c(47.66796,47.63436,47.57665,47.71930,47.60616,47.55392),强度 = c(100,20,30,400,50,3))j <- paste0("[",dat[,"Latitude"], ",", dat[,"Longitude"], ",", dat[,"intensity"], "]", collapse=",")j <- paste0("[",j,"]")``<!-- 添加热图 html--><div id="热图"></div><link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.css"/><script src="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.js"></script><风格>#heatmap { 宽度:800px;高度:600px；}body { font: 16px/1.4 "Helvetica Neue", Arial, sans-serif;}.ghbtns { 位置:相对；顶部:4px；左边距:5px；}{ 颜色:#0077ff;}</风格><script src="http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js"></script><脚本>var heatmap = L.map('heatmap').setView([47.5982623,-122.3415519], 12);vartiles = L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {归属:'&copy;<a href="http://osm.org/copyright">OpenStreetMap</a>贡献者，}).addTo(热图);地址点 = `r j` ;var heat = L.heatLayer(addressPoints).addTo(heatmap);

Question

Can you plot a leaflet heatmap in an rmarkdown document?

Example working code

This code will generate a leaflet map with a heatmap when run directly from R

library(rCharts)

## data
dat <- data.frame(Longitude = c(-122.3809, -122.3269, -122.3342, -122.2984, -122.3044, -122.2754),
              Latitude = c(47.66796,47.63436,47.57665,47.71930,47.60616,47.55392),
              intensity = c(10,20,30,40,50,300))

## create JSON for heatmap
## - could also use jsonlite::toJSON
j <- paste0("[",dat[,"Latitude"], ",", dat[,"Longitude"], ",", dat[,"intensity"], "]", collapse=",")
j <- paste0("[",j,"]")

## create leaflet map
leaf_map <- Leaflet$new()
leaf_map$setView(c(47.5982623,-122.3415519), zoom=10)
leaf_map$tileLayer(provider="Acetate.terrain")

## add heatmap plugin
leaf_map$addAssets(jshead = c("http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js"))

## heatmap layer
leaf_map$setTemplate(afterScript = sprintf("
    <script> 
    var addressPoints = %s
    var heat = L.heatLayer(addressPoints).addTo(map)           
    </script>
    ", j
))

## output map
leaf_map

Output:

I have an example of this working in shiny too using tags$ and HTML().

rmarkdown chunk

Using Ramnath's example of embedding rCharts in R Markdown I can get close to creating this in a markdown document, but when this runs it displays the map, but not the heat.

```{r heatMapMarkdown, results='asis', comment=NA, cache=F}

## References
# - http://bl.ocks.org/ramnathv/raw/8084330/ - embedding rCharts in R Markdown

library(rCharts)

dat <- data.frame(Longitude = c(-122.3809, -122.3269, -122.3342, -122.2984, -122.3044, -122.2754),
              Latitude = c(47.66796,47.63436,47.57665,47.71930,47.60616,47.55392),
              intensity = c(10,20,30,40,50,300))


## create JSON for heatmap
## - could also use jsonlite::toJSON
j <- paste0("[",dat[,"Latitude"], ",", dat[,"Longitude"], ",", dat[,"intensity"], "]", collapse=",")
j <- paste0("[",j,"]")

leaf_map <- Leaflet$new()
leaf_map$setView(c(47.5982623,-122.3415519), zoom=10)
leaf_map$tileLayer(provider="Acetate.terrain")

## Add circle:
# leaf_map$marker(c(47.5982623, -122.3415519))

leaf_map$addAssets(jshead = c("http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js"))

leaf_map$setTemplate(afterScript = sprintf("
    <script> 
    var addressPoints = %s
    var heat = L.heatLayer(addressPoints).addTo(map)           
    </script>
    ", j
))

## shows the map, but not the heat...
leaf_map$print('iframesrc', include_assets=TRUE, cdn=TRUE)

```

Is it possible to get the 'heat' to display on the map too?

解决方案

I figured this out thanks to the answer to the question How to add an interactive visualisation to R Markdown

First, I create an html document for the <head> section to include a src to the heatmap plugin, and save it in the same directory as my .Rmd file with the name include_js_heatmap.html

<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.css" />
<script src="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.js"></script>
<style>
    #map { width: 800px; height: 600px; }
    body { font: 16px/1.4 "Helvetica Neue", Arial, sans-serif; }
    .ghbtns { position: relative; top: 4px; margin-left: 5px; }
    a { color: #0077ff; }
</style> 

<script src = "http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js"></script>

I can then include this in the header of the .Rmd, and write the html to generate the heatmap directly into the body of the document.

To make the heat interactive I can construct the JSON of heat points in a code chunk, then include it in the body of the document with the r ... notation

---
title: heatmapRMarkdown
output:
  html_document:
    self_contained: false
    keep_md: true
    includes:
      in_header: "include_js_heatmap.html"
---

```{r}
dat <- data.frame(Longitude = c(-122.3809, -122.3269, -122.3342, -122.2984, -122.3044, -122.2754),
                  Latitude = c(47.66796,47.63436,47.57665,47.71930,47.60616,47.55392),
                  intensity = c(100,20,30,400,50,3))

j <- paste0("[",dat[,"Latitude"], ",", dat[,"Longitude"], ",", dat[,"intensity"], "]", collapse=",")
j <- paste0("[",j,"]")

```

<div id="map"></div>

<script src="http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js"></script>

<script>
var map = L.map('map').setView([47.5982623,-122.3415519], 12);

var tiles = L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors',
}).addTo(map);

addressPoints = `r j` ;

var heat = L.heatLayer(addressPoints).addTo(map);
</script>

Update

The <div ...> method will create a directory alongside the .Rmd file with various .html, .js, .css files within it. Once this is created the standard rCharts code will work without the need for the <div...> html code any more:

## create leaflet map
leaf_map <- Leaflet$new()
leaf_map$setView(c(47.5982623,-122.3415519), zoom=10)
leaf_map$tileLayer(provider="Acetate.terrain")

## add heatmap plugin
leaf_map$addAssets(jshead = c("http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js"))

## heatmap layer
leaf_map$setTemplate(afterScript = sprintf("
    <script> 
    var addressPoints = %s
    var heat = L.heatLayer(addressPoints).addTo(map)           
    </script>
    ", j
))

## output map
leaf_map 

Update 2

A slight variation on this which avoids the include is to use the all the relevant html directly in the .Rmd document:

```{r baseMap, results='asis', echo=FALSE, comment=NA, cache=FALSE}
library(rCharts)
dat <- data.frame(Longitude = c(-122.3809, -122.3269, -122.3342, -122.2984, -122.3044, -122.2754),
                  Latitude = c(47.66796,47.63436,47.57665,47.71930,47.60616,47.55392),
                  intensity = c(100,20,30,400,50,3))

j <- paste0("[",dat[,"Latitude"], ",", dat[,"Longitude"], ",", dat[,"intensity"], "]", collapse=",")
j <- paste0("[",j,"]")

```

<!-- add heatmap html-->
<div id="heatmap"></div>
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.css" />
<script src="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.js"></script>
<style>
  #heatmap { width: 800px; height: 600px; }
  body { font: 16px/1.4 "Helvetica Neue", Arial, sans-serif; }
  .ghbtns { position: relative; top: 4px; margin-left: 5px; }
  a { color: #0077ff; }
</style> 
<script src="http://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js"></script>

<script>
  var heatmap = L.map('heatmap').setView([47.5982623,-122.3415519], 12);
  var tiles = L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors',
    }).addTo(heatmap);
  addressPoints = `r j` ;
  var heat = L.heatLayer(addressPoints).addTo(heatmap);
</script>

这篇关于r - rmarkdown 中的传单热图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！