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sankey.go
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sankey.go
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package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"path"
"github.com/nj-apps/go-echarts/charts"
"github.com/gobuffalo/packr"
)
var sankeyNode = []charts.SankeyNode{
{Name: "category1"},
{Name: "category2"},
{Name: "category3"},
{Name: "category4"},
{Name: "category5"},
{Name: "category6"},
}
var sankeyLink = []charts.SankeyLink{
{Source: "category1", Target: "category2", Value: 10},
{Source: "category2", Target: "category3", Value: 15},
{Source: "category3", Target: "category4", Value: 20},
{Source: "category5", Target: "category6", Value: 25},
}
func sankeyBase() *charts.Sankey {
sankey := charts.NewSankey()
sankey.SetGlobalOptions(charts.TitleOpts{Title: "Sankey-示例图"})
sankey.Add("sankey", sankeyNode, sankeyLink, charts.LabelTextOpts{Show: true})
return sankey
}
func graphEnergy() *charts.Sankey {
sankey := charts.NewSankey()
sankey.SetGlobalOptions(charts.TitleOpts{Title: "Sankey-官方示例"})
box := packr.NewBox(path.Join(".", "fixtures"))
f, err := box.Find("energy.json")
if err != nil {
log.Fatal(err)
}
type Data struct {
Nodes []charts.SankeyNode
Links []charts.SankeyLink
}
var data Data
if err := json.Unmarshal(f, &data); err != nil {
fmt.Println(err)
}
sankey.Add("sankey", data.Nodes, data.Links,
charts.LineStyleOpts{Curveness: 0.5, Color: "source"},
charts.LabelTextOpts{Show: true},
)
return sankey
}
func sankeyHandler(w http.ResponseWriter, _ *http.Request) {
page := charts.NewPage(orderRouters("sankey")...)
page.Add(
sankeyBase(),
graphEnergy(),
)
f, err := os.Create(getRenderPath("sankey.html"))
if err != nil {
log.Println(err)
}
page.Render(w, f)
}