資料可視化----ECharts—散點圖（五）
百度百科上散點圖的定義
散點圖是指在回歸分析中，資料點在直角坐標系平面上的分布圖，散點圖表示因變數隨自變數而變化的大致趨勢，據此可以選擇合適的函式對資料點進行擬合，
散點圖的特點
用兩組資料構成多個坐標點，考察坐標點的分布，判斷兩變數之間是否存在某種關聯或總結坐標點的分布模式，
散點圖將序列顯示為一組點，
值由點在圖表中的位置表示，
類別由圖表中的不同標記表示，
散點圖通常用于比較跨類別的聚合資料，
案例說明
我們本次實作一個小案例是我們用一組資料來證明身高和體重的關系，一般情況下身高和體重應當是正相關的，身高越高的人一般情況下，體重也就越大
PS：這里說的是通常情況下，我們不要拿個例來反駁哈
Echarts中如何實作散點圖
- ECharts最基本的代碼結構
引入js檔案，DOM容器，初始化物件，設定option
- x軸和y軸資料 二維陣列
[ [身高,體重],[身高,體重],[身高,體重],… ]
這里我們準備了五百組不同的資料
- 將type的值設定為scatter, x軸和y軸的type都是value
注意：這個配置是散點圖的關鍵
- 下面讓我們來一起實作一下
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<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="lib/echarts.min.js"></script>
</head>
<body>
<div style="width: 600px;height:400px"></div>
<script>
//1. ECharts最基本的代碼結構
//2. x軸和y軸資料 二維陣列 [ [身高,體重],... ]
//3. 將type的值設定為scatter, x軸和y軸的type都是value
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"height": 186, "weight": 84.8 }, { "gender": "male", "height": 167, "weight": 68.2 }, { "gender": "male", "height": 171.8, "weight": 66.1 }, { "gender": "male", "height": 182, "weight": 72 }, { "gender": "male", "height": 167, "weight": 64.6 }, { "gender": "male", "height": 177.8, "weight": 74.8 }, { "gender": "male", "height": 164.5, "weight": 70 }, { "gender": "male", "height": 192, "weight": 101.6 }, { "gender": "male", "height": 175.5, "weight": 63.2 }, { "gender": "male", "height": 171.2, "weight": 79.1 }, { "gender": "male", "height": 181.6, "weight": 78.9 }, { "gender": "male", "height": 167.4, "weight": 67.7 }, { "gender": "male", "height": 181.1, "weight": 66 }, { "gender": "male", "height": 177, "weight": 68.2 }, { "gender": "male", "height": 174.5, "weight": 63.9 }, { "gender": "male", "height": 177.5, "weight": 72 }, { "gender": "male", "height": 170.5, "weight": 56.8 }, { "gender": "male", "height": 182.4, "weight": 74.5 }, { "gender": "male", "height": 197.1, "weight": 90.9 }, { "gender": "male", "height": 180.1, "weight": 93 }, { "gender": "male", "height": 175.5, "weight": 80.9 }, { "gender": "male", "height": 180.6, "weight": 72.7 }, { "gender": "male", "height": 184.4, "weight": 68 }, { "gender": "male", "height": 175.5, "weight": 70.9 }, { "gender": "male", "height": 180.6, "weight": 72.5 }, { "gender": "male", "height": 177, "weight": 72.5 }, { "gender": "male", "height": 177.1, "weight": 83.4 }, { "gender": "male", "height": 181.6, "weight": 75.5 }, { "gender": "male", "height": 176.5, "weight": 73 }, { "gender": "male", "height": 175, "weight": 70.2 }, { "gender": "male", "height": 174, "weight": 73.4 }, { "gender": "male", "height": 165.1, "weight": 70.5 }, { "gender": "male", "height": 177, "weight": 68.9 }, { "gender": "male", "height": 192, "weight": 102.3 }, { "gender": "male", "height": 176.5, "weight": 68.4 }, { "gender": "male", "height": 169.4, "weight": 65.9 }, { "gender": "male", "height": 182.1, "weight": 75.7 }, { "gender": "male", "height": 179.8, "weight": 84.5 }, { "gender": "male", "height": 175.3, "weight": 87.7 }, { "gender": "male", "height": 184.9, "weight": 86.4 }, { "gender": "male", "height": 177.3, "weight": 73.2 }, { "gender": "male", "height": 167.4, "weight": 53.9 }, { "gender": "male", "height": 178.1, "weight": 72 }, { "gender": "male", "height": 168.9, "weight": 55.5 }, { "gender": "male", "height": 157.2, "weight": 58.4 }, { "gender": "male", "height": 180.3, "weight": 83.2 }, { "gender": "male", "height": 170.2, "weight": 72.7 }, { "gender": "male", "height": 177.8, "weight": 64.1 }, { "gender": "male", "height": 172.7, "weight": 72.3 }, { "gender": "male", "height": 165.1, "weight": 65 }, { "gender": "male", "height": 186.7, "weight": 86.4 }, { "gender": "male", "height": 165.1, "weight": 65 }, { "gender": "male", "height": 174, "weight": 88.6 }, { "gender": "male", "height": 175.3, "weight": 84.1 }, { "gender": "male", "height": 185.4, "weight": 66.8 }, { "gender": "male", "height": 177.8, "weight": 75.5 }, { "gender": "male", "height": 180.3, "weight": 93.2 }, { "gender": "male", "height": 180.3, "weight": 82.7 }, { "gender": "male", "height": 177.8, "weight": 58 }, { "gender": "male", "height": 177.8, "weight": 79.5 }, { "gender": "male", "height": 177.8, "weight": 78.6 }, { "gender": "male", "height": 177.8, "weight": 71.8 }, { "gender": "male", "height": 177.8, "weight": 116.4 }, { "gender": "male", "height": 163.8, "weight": 72.2 }, { "gender": "male", "height": 188, "weight": 83.6 }, { "gender": "male", "height": 198.1, "weight": 85.5 }, { "gender": "male", "height": 175.3, "weight": 90.9 }, { "gender": "male", "height": 166.4, "weight": 85.9 }, { "gender": "male", "height": 190.5, "weight": 89.1 }, { "gender": "male", "height": 166.4, "weight": 75 }, { "gender": "male", "height": 177.8, "weight": 77.7 }, { "gender": "male", "height": 179.7, "weight": 86.4 }, { "gender": "male", "height": 172.7, "weight": 90.9 }, { "gender": "male", "height": 190.5, "weight": 73.6 }, { "gender": "male", "height": 185.4, "weight": 76.4 }, { "gender": "male", "height": 168.9, "weight": 69.1 }, { "gender": "male", "height": 167.6, "weight": 84.5 }, { "gender": "male", "height": 175.3, "weight": 64.5 }, { "gender": "male", "height": 170.2, "weight": 69.1 }, { "gender": "male", "height": 190.5, "weight": 108.6 }, { "gender": "male", "height": 177.8, "weight": 86.4 }, { "gender": "male", "height": 190.5, "weight": 80.9 }, { "gender": "male", "height": 177.8, "weight": 87.7 }, { "gender": "male", "height": 184.2, "weight": 94.5 }, { "gender": "male", "height": 176.5, "weight": 80.2 }, { "gender": "male", "height": 177.8, "weight": 72 }, { "gender": "male", "height": 180.3, "weight": 71.4 }, { "gender": "male", "height": 171.4, "weight": 72.7 }, { "gender": "male", "height": 172.7, "weight": 84.1 }, { "gender": "male", "height": 172.7, "weight": 76.8 }, { "gender": "male", "height": 177.8, "weight": 63.6 }, { "gender": "male", "height": 177.8, "weight": 80.9 }, { "gender": "male", "height": 182.9, "weight": 80.9 }, { "gender": "male", "height": 170.2, "weight": 85.5 }, { "gender": "male", "height": 167.6, "weight": 68.6 }, { "gender": "male", "height": 175.3, "weight": 67.7 }, { "gender": "male", "height": 165.1, "weight": 66.4 }, { "gender": "male", "height": 185.4, "weight": 102.3 }, { "gender": "male", "height": 181.6, "weight": 70.5 }, { "gender": "male", "height": 172.7, "weight": 95.9 }, { "gender": "male", "height": 190.5, "weight": 84.1 }, { "gender": "male", "height": 179.1, "weight": 87.3 }, { "gender": "male", "height": 175.3, "weight": 71.8 }, { "gender": "male", "height": 170.2, "weight": 65.9 }, { "gender": "male", "height": 193, "weight": 95.9 }, { "gender": "male", "height": 171.4, "weight": 91.4 }, { "gender": "male", "height": 177.8, "weight": 81.8 }, { "gender": "male", "height": 177.8, "weight": 96.8 }, { "gender": "male", "height": 167.6, "weight": 69.1 }, { "gender": "male", "height": 167.6, "weight": 82.7 }, { "gender": "male", "height": 180.3, "weight": 75.5 }, { "gender": "male", "height": 182.9, "weight": 79.5 }, { "gender": "male", "height": 176.5, "weight": 73.6 }, { "gender": "male", "height": 186.7, "weight": 91.8 }, { "gender": "male", "height": 188, "weight": 84.1 }, { "gender": "male", "height": 188, "weight": 85.9 }, { "gender": "male", "height": 177.8, "weight": 81.8 }, { "gender": "male", "height": 174, "weight": 82.5 }, { "gender": "male", "height": 177.8, "weight": 80.5 }, { "gender": "male", "height": 171.4, "weight": 70 }, { "gender": "male", "height": 185.4, "weight": 81.8 }, { "gender": "male", "height": 185.4, "weight": 84.1 }, { "gender": "male", "height": 188, "weight": 90.5 }, { "gender": "male", "height": 188, "weight": 91.4 }, { "gender": "male", "height": 182.9, "weight": 89.1 }, { "gender": "male", "height": 176.5, "weight": 85 }, { "gender": "male", "height": 175.3, "weight": 69.1 }, { "gender": "male", "height": 175.3, "weight": 73.6 }, { "gender": "male", "height": 188, "weight": 80.5 }, { "gender": "male", "height": 188, "weight": 82.7 }, { "gender": "male", "height": 175.3, "weight": 86.4 }, { "gender": "male", "height": 170.5, "weight": 67.7 }, { "gender": "male", "height": 179.1, "weight": 92.7 }, { "gender": "male", "height": 177.8, "weight": 93.6 }, { "gender": "male", "height": 175.3, "weight": 70.9 }, { "gender": "male", "height": 182.9, "weight": 75 }, { "gender": "male", "height": 170.8, "weight": 93.2 }, { "gender": "male", "height": 188, "weight": 93.2 }, { "gender": "male", "height": 180.3, "weight": 77.7 }, { "gender": "male", "height": 177.8, "weight": 61.4 }, { "gender": "male", "height": 185.4, "weight": 94.1 }, { "gender": "male", "height": 168.9, "weight": 75 }, { "gender": "male", "height": 185.4, "weight": 83.6 }, { "gender": "male", "height": 180.3, "weight": 85.5 }, { "gender": "male", "height": 174, "weight": 73.9 }, { "gender": "male", "height": 167.6, "weight": 66.8 }, { "gender": "male", "height": 182.9, "weight": 87.3 }, { "gender": "male", "height": 160, "weight": 72.3 }, { "gender": "male", "height": 180.3, "weight": 88.6 }, { "gender": "male", "height": 167.6, "weight": 75.5 }, { "gender": "male", "height": 186.7, "weight": 101.4 }, { "gender": "male", "height": 175.3, "weight": 91.1 }, { "gender": "male", "height": 175.3, "weight": 67.3 }, { "gender": "male", "height": 175.9, "weight": 77.7 }, { "gender": "male", "height": 175.3, "weight": 81.8 }, { "gender": "male", "height": 179.1, "weight": 75.5 }, { "gender": "male", "height": 181.6, "weight": 84.5 }, { "gender": "male", "height": 177.8, "weight": 76.6 }, { "gender": "male", "height": 182.9, "weight": 85 }, { "gender": "male", "height": 177.8, "weight": 102.5 }, { "gender": "male", "height": 184.2, "weight": 77.3 }, { "gender": "male", "height": 179.1, "weight": 71.8 }, { "gender": "male", "height": 176.5, "weight": 87.9 }, { "gender": "male", "height": 188, "weight": 94.3 }, { "gender": "male", "height": 174, "weight": 70.9 }, { "gender": "male", "height": 167.6, "weight": 64.5 }, { "gender": "male", "height": 170.2, "weight": 77.3 }, { "gender": "male", "height": 167.6, "weight": 72.3 }, { "gender": "male", "height": 188, "weight": 87.3 }, { "gender": "male", "height": 174, "weight": 80 }, { "gender": "male", "height": 176.5, "weight": 82.3 }, { "gender": "male", "height": 180.3, "weight": 73.6 }, { "gender": "male", "height": 167.6, "weight": 74.1 }, { "gender": "male", "height": 188, "weight": 85.9 }, { "gender": "male", "height": 180.3, "weight": 73.2 }, { "gender": "male", "height": 167.6, "weight": 76.3 }, { "gender": "male", "height": 183, "weight": 65.9 }, { "gender": "male", "height": 183, "weight": 90.9 }, { "gender": "male", "height": 179.1, "weight": 89.1 }, { "gender": "male", "height": 170.2, "weight": 62.3 }, { "gender": "male", "height": 177.8, "weight": 82.7 }, { "gender": "male", "height": 179.1, "weight": 79.1 }, { "gender": "male", "height": 190.5, "weight": 98.2 }, { "gender": "male", "height": 177.8, "weight": 84.1 }, { "gender": "male", "height": 180.3, "weight": 83.2 }, { "gender": "male", "height": 180.3, "weight": 83.2 }]
var axisData = []
//這里的for回圈實作了對上面資料的深拷貝
for( var i=0;i<data.length;i++) {
var height = data[i].height
var weight = data[i].weight
var newArr = [height, weight]
axisData.push(newArr)
}
console.log(axisData)
var mCharts = echarts.init(document.querySelector("div"))
var option = {
xAxis: {
type: 'value',
scale: true
},
yAxis: {
type: 'value',
scale: true
},
series: [
{
type: 'scatter', // 指明圖表的型別為散點圖
data: axisData
}
]
}
mCharts.setOption(option)
</script>
</body>
</html>
這時候們就實作了一張基本的散點圖
散點圖的常見效果
- 散點的大小
這里我們用到了身體質量指數BMI
計算公式為：BMI=體重÷身高^2，（體重單位：千克；身高單位：米，）
另外我們把BMI=28作為分隔線，大于28就是肥胖，小于28的就是正常
symbolSize: function (arg) { // 控制散點的大小
// console.log(arg)
var height = arg[0] / 100
var weight = arg[1]
// bmi = 體重kg / (身高m*身高m) 大于28,就代表肥胖
var bmi = weight / (height * height)
if (bmi > 28) {
return 20
}
return 5
}
- 散點的樣式
itemStyle: { // 控制散點的樣式
color: function (arg) {
// console.log(arg)
var height = arg.data[0] / 100
var weight = arg.data[1]
// bmi = 體重kg / (身高m*身高m) 大于28,就代表肥胖
var bmi = weight / (height * height)
if (bmi > 28) {
return 'red'
}
return 'green'
}
}
- 漣漪影片效果
type: 'effectScatter', // 指明圖表為帶漣漪影片的散點圖
showEffectOn: 'emphasis', // 出現漣漪影片的時機 render emphasis
rippleEffect: {
scale: 10 // 漣漪影片時, 散點的縮放比例
}
完整代碼
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="lib/echarts.min.js"></script>
</head>
<body>
<div style="width: 600px;height:400px"></div>
<script>
//1. ECharts最基本的代碼結構
//2. x軸和y軸資料 二維陣列 [ [身高,體重],... ]
//3. 將type的值設定為scatter, x軸和y軸的type都是value
var data = [
// 這個資料我就不寫了
]
var axisData = []
for (var i = 0; i < data.length; i++) {
var height = data[i].height
var weight = data[i].weight
var newArr = [height, weight]
axisData.push(newArr)
}
console.log(axisData)
var mCharts = echarts.init(document.querySelector("div"))
var option = {
xAxis: {
type: 'value',
scale: true
},
yAxis: {
type: 'value',
scale: true
},
series: [
{
// type: 'scatter',
type: 'effectScatter', // 指明圖表為帶漣漪影片的散點圖
showEffectOn: 'emphasis', // 出現漣漪影片的時機 render emphasis
rippleEffect: {
scale: 10 // 漣漪影片時, 散點的縮放比例
},
data: axisData,
// symbolSize: 30
symbolSize: function (arg) { // 控制散點的大小
// console.log(arg)
var height = arg[0] / 100
var weight = arg[1]
// bmi = 體重kg / (身高m*身高m) 大于28,就代表肥胖
var bmi = weight / (height * height)
if (bmi > 28) {
return 20
}
return 5
},
itemStyle: { // 控制散點的樣式
color: function (arg) {
// console.log(arg)
var height = arg.data[0] / 100
var weight = arg.data[1]
// bmi = 體重kg / (身高m*身高m) 大于28,就代表肥胖
var bmi = weight / (height * height)
if (bmi > 28) {
return 'red'
}
return 'green'
}
}
}
]
}
mCharts.setOption(option)
</script>
</body>
</html>
最終效果
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標籤：其他