package main import ( "fmt" "log" "net/http" "github.com/wcharczuk/go-chart" ) func drawChart(res http.ResponseWriter, req *http.Request) { pie := chart.PieChart{ Width: 512, Height: 512, Values: []chart.Value{ {Value: 5, Label: "Blue"}, {Value: 5, Label: "Green"}, {Value: 4, Label: "Gray"}, {Value: 4, Label: "Orange"}, {Value: 3, Label: "Deep Blue"}, {Value: 3, Label: "??"}, {Value: 1, Label: "!!"}, }, } res.Header().Set("Content-Type", "image/png") err := pie.Render(chart.PNG, res) if err != nil { fmt.Printf("Error rendering pie chart: %v\n", err) } } func drawChartRegression(res http.ResponseWriter, req *http.Request) { pie := chart.PieChart{ Width: 512, Height: 512, Values: []chart.Value{ {Value: 5, Label: "Blue"}, {Value: 2, Label: "Two"}, {Value: 1, Label: "One"}, }, } res.Header().Set("Content-Type", chart.ContentTypeSVG) err := pie.Render(chart.SVG, res) if err != nil { fmt.Printf("Error rendering pie chart: %v\n", err) } } func main() { http.HandleFunc("/", drawChart) http.HandleFunc("/reg", drawChartRegression) log.Fatal(http.ListenAndServe(":8080", nil)) }