go-chart/examples/pie_chart/main.go

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2016-07-28 11:34:44 +02:00
package main
import (
"fmt"
"log"
"net/http"
"github.com/wcharczuk/go-chart"
)
func drawChart(res http.ResponseWriter, req *http.Request) {
pie := chart.PieChart{
Canvas: chart.Style{
FillColor: chart.ColorLightGray,
},
Values: []chart.PieChartValue{
{Value: 0.3, Label: "Blue"},
{Value: 0.2, Label: "Green"},
{Value: 0.2, Label: "Gray"},
{Value: 0.1, Label: "Orange"},
{Value: 0.1, Label: "??"},
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{Value: 0.1, Label: "!!"},
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},
}
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 main() {
http.HandleFunc("/", drawChart)
log.Fatal(http.ListenAndServe(":8080", nil))
}