go-chart/_examples/stacked_bar/main.go

package main

import (
	"fmt"
	"log"
	"net/http"

	"github.com/wcharczuk/go-chart"
)

func drawChart(res http.ResponseWriter, req *http.Request) {
	sbc := chart.StackedBarChart{
		Title:      "Test Stacked Bar Chart",
		TitleStyle: chart.StyleShow(),
		Background: chart.Style{
			Padding: chart.Box{
				Top: 40,
			},
		},
		Height: 512,
		XAxis: chart.Style{
			Show: true,
		},
		YAxis: chart.Style{
			Show: true,
		},
		Bars: []chart.StackedBar{
			{
				Name: "This is a very long string to test word break wrapping.",
				Values: []chart.Value{
					{Value: 5, Label: "Blue"},
					{Value: 5, Label: "Green"},
					{Value: 4, Label: "Gray"},
					{Value: 3, Label: "Orange"},
					{Value: 3, Label: "Test"},
					{Value: 2, Label: "??"},
					{Value: 1, Label: "!!"},
				},
			},
			{
				Name: "Test",
				Values: []chart.Value{
					{Value: 10, Label: "Blue"},
					{Value: 5, Label: "Green"},
					{Value: 1, Label: "Gray"},
				},
			},
			{
				Name: "Test 2",
				Values: []chart.Value{
					{Value: 10, Label: "Blue"},
					{Value: 6, Label: "Green"},
					{Value: 4, Label: "Gray"},
				},
			},
		},
	}

	res.Header().Set("Content-Type", "image/png")
	err := sbc.Render(chart.PNG, res)
	if err != nil {
		fmt.Printf("Error rendering chart: %v\n", err)
	}
}

func main() {
	http.HandleFunc("/", drawChart)
	log.Fatal(http.ListenAndServe(":8080", nil))
}