go-chart/_examples/pie_chart/main.go

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