Go使用绘图的库(go-chartsgo-echarts)

Posted 2022-10-05 Harris-H

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Go使用绘图的库(go-charts、go-echarts)

1.go-echarts

1.1 实例

直方图

引入依赖

require github.com/go-echarts/go-echarts/v2 v2.2.4

package main

import (
	"math/rand"
	"os"

	"github.com/go-echarts/go-echarts/v2/charts"
	"github.com/go-echarts/go-echarts/v2/opts"
)

// generate random data for bar chart
func generateBarItems() []opts.BarData 
	items := make([]opts.BarData, 0)
	for i := 0; i < 7; i++ 
		items = append(items, opts.BarDataValue: rand.Intn(300))
	
	return items


func main() 
	// create a new bar instance
	bar := charts.NewBar()
	// set some global options like Title/Legend/ToolTip or anything else
	bar.SetGlobalOptions(charts.WithTitleOpts(opts.Title
		Title:    "My first bar chart generated by go-echarts",
		Subtitle: "It's extremely easy to use, right?",
	))

	// Put data into instance
	bar.SetXAxis([]string"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun").
		AddSeries("Category A", generateBarItems()).
		AddSeries("Category B", generateBarItems())
	// Where the magic happens
	f, _ := os.Create("bar.html")
	bar.Render(f)

效果

当然也可以使用启动 http 服务将图表直接渲染出来

曲线图

package main

import (
	"math/rand"
	"net/http"

	"github.com/go-echarts/go-echarts/v2/charts"
	"github.com/go-echarts/go-echarts/v2/opts"
	"github.com/go-echarts/go-echarts/v2/types"
)

// generate random data for line chart
func generateLineItems() []opts.LineData 
	items := make([]opts.LineData, 0)
	for i := 0; i < 7; i++ 
		items = append(items, opts.LineDataValue: rand.Intn(300))
	
	return items


func httpserver(w http.ResponseWriter, _ *http.Request) 
	// create a new line instance
	line := charts.NewLine()
	// set some global options like Title/Legend/ToolTip or anything else
	line.SetGlobalOptions(
		charts.WithInitializationOpts(opts.InitializationTheme: types.ThemeWesteros),
		charts.WithTitleOpts(opts.Title
			Title:    "Line example in Westeros theme",
			Subtitle: "Line chart rendered by the http server this time",
		))

	// Put data into instance
	line.SetXAxis([]string"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun").
		AddSeries("Category A", generateLineItems()).
		AddSeries("Category B", generateLineItems()).
		SetSeriesOptions(charts.WithLineChartOpts(opts.LineChartSmooth: true))
	line.Render(w)


func main() 
	http.HandleFunc("/", httpserver)
	http.ListenAndServe(":8081", nil)

效果

其他

饼图

package go_chart

import (
	"math/rand"
	"os"
	"testing"

	"github.com/go-echarts/go-echarts/v2/charts"
	"github.com/go-echarts/go-echarts/v2/opts"
)

var (
	itemCntPie = 4
	seasons    = []string"Spring", "Summer", "Autumn ", "Winter"
)

func generatePieItems() []opts.PieData 
	items := make([]opts.PieData, 0)
	for i := 0; i < itemCntPie; i++ 
		items = append(items, opts.PieDataName: seasons[i], Value: rand.Intn(100))
	
	return items


func pieBase() *charts.Pie 
	pie := charts.NewPie()
	pie.SetGlobalOptions(
		charts.WithTitleOpts(opts.TitleTitle: "basic pie example"),
	)

	pie.AddSeries("pie", generatePieItems())
	return pie


func pieShowLabel() *charts.Pie 
	pie := charts.NewPie()
	pie.SetGlobalOptions(
		charts.WithTitleOpts(opts.TitleTitle: "label options"),
	)

	pie.AddSeries("pie", generatePieItems()).
		SetSeriesOptions(charts.WithLabelOpts(
			opts.Label
				Show:      true,
				Formatter: "b: c",
			),
		)
	return pie


func pieRadius() *charts.Pie 
	pie := charts.NewPie()
	pie.SetGlobalOptions(
		charts.WithTitleOpts(opts.TitleTitle: "Radius style"),
	)

	pie.AddSeries("pie", generatePieItems()).
		SetSeriesOptions(
			charts.WithLabelOpts(opts.Label
				Show:      true,
				Formatter: "b: c",
			),
			charts.WithPieChartOpts(opts.PieChart
				Radius: []string"40%", "75%",
			),
		)
	return pie


func pieRoseArea() *charts.Pie 
	pie := charts.NewPie()
	pie.SetGlobalOptions(
		charts.WithTitleOpts(opts.Title
			Title: "Rose(Area)",
		),
	)

	pie.AddSeries("pie", generatePieItems()).
		SetSeriesOptions(
			charts.WithLabelOpts(opts.Label
				Show:      true,
				Formatter: "b: c",
			),
			charts.WithPieChartOpts(opts.PieChart
				Radius:   []string"40%", "75%",
				RoseType: "area",
			),
		)
	return pie


func pieRoseRadius() *charts.Pie 
	pie := charts.NewPie()
	pie.SetGlobalOptions(
		charts.WithTitleOpts(opts.Title
			Title: "Rose(Radius)",
		),
	)

	pie.AddSeries("pie", generatePieItems()).
		SetSeriesOptions(
			charts.WithLabelOpts(opts.Label
				Show:      true,
				Formatter: "b: c",
			),
			charts.WithPieChartOpts(opts.PieChart
				Radius:   []string"30%", "75%",
				RoseType: "radius",
			),
		)
	return pie


func pieRoseAreaRadius() *charts.Pie 
	pie := charts.NewPie()
	pie.SetGlobalOptions(
		charts.WithTitleOpts(opts.Title
			Title: "Rose(Area/Radius)",
		),
	)

	pie.AddSeries("area", generatePieItems()).
		SetSeriesOptions(
			charts.WithPieChartOpts(opts.PieChart
				Radius:   []string"30%", "75%",
				RoseType: "area",
				Center:   []string"25%", "50%",
			),
		)

	pie.AddSeries("pie", generatePieItems()).
		SetSeriesOptions(
			charts.WithLabelOpts(opts.Label
				Show:      true,
				Formatter: "b: c",
			),
			charts.WithPieChartOpts(opts.PieChart
				Radius:   []string"30%", "75%",
				RoseType: "radius",
				Center:   []string"75%", "50%",
			),
		)
	return pie


func pieInPie() *charts.Pie 
	pie := charts.NewPie()
	pie.SetGlobalOptions(
		charts.WithTitleOpts(opts.Title
			Title: "pie in pie",
		),
	)

	pie.AddSeries("area", generatePieItems(),
		charts.WithLabelOpts(opts.Label
			Show:      true,
			Formatter: "b: c",
		),
		charts.WithPieChartOpts(opts.PieChart
			Radius:   []string"50%", "55%",
			RoseType: "area",
		),
	)

	pie.AddSeries("radius", generatePieItems(),
		charts.WithPieChartOpts(opts.PieChart
			Radius:   []string"0%", "45%",
			RoseType: "radius",
		),
	)
	return pie


type PieExamples struct

//func TestPie(t *testing.T) 
//	//(PieExamples)
//	page := components.NewPage()
//	page.AddCharts(
//		pieBase(),
//		pieShowLabel(),
//		pieRadius(),
//		pieRoseArea(),
//		pieRoseRadius(),
//		pieRoseAreaRadius(),
//		pieInPie(),
//	)
//	f, err := os.Create("examples/html/pie.html")
//	if err != nil 
//		panic(err)
//	
//	page.Render(io.MultiWriter(f))
//

func TestPie(t *testing.T) 
	// create a new bar instance
	pie := pieBase()
	// Where the magic happens
	f, _ := os.Create("pie.html")
	pie.Render(f)

2.go-charts

xValue := []string
yValue := [][]float64

// 处理结果
for _, value := range allRequest[0].Series[0].Values 
	tempY := []float64
	resultX := value[0].(string)
	xValue = append(xValue, resultX)
	number, _ := value[1].(json.Number)
	resultY, _ := number.Float64()
	tempY = append(tempY, resultY)


// 对 x 轴格式化 原：2022-07-29T09:24:10Z，新：09:24:10
formatXValue := []string
for _, x := range xValue 
	formatTime, err := time.Parse(time.RFC3339, x)
	if err != nil 

	
	formatX := formatTime.Local().Format("15:04:05")
	formatXValue = append(formatXValue, formatX)


f := false // 设置 x 轴的样式

// 字体文件需要自行下载
buff, err := ioutil.ReadFile("./TencentSans-W7.ttf")
if err != nil 
	panic(err)

err = charts.InstallFont("noto", buff)
if err != nil 
	panic(err)


// 渲染图表
p, err := charts.LineRender(
	yValue,
	charts.FontFamilyOptionFunc("noto"),
	charts.TitleTextOptionFunc("全部请求"),
	charts.XAxisDataOptionFunc(xValue),
	func(opt *charts.ChartOption) 
		opt.XAxis.BoundaryGap = &f
		opt.Padding = charts.BoxLeft: 20, Right: 50, Top: 20, Bottom: 20
	,
	charts.ThemeOptionFunc("grafana"),
	charts.WidthOptionFunc(1000),
)

3.参考文档

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