go-chart/_examples/stacked_bar/main.go

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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,
},
},
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Height: 512,
XAxis: chart.StyleShow(),
YAxis: chart.StyleShow(),
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Bars: []chart.StackedBar{
{
Name: "This is a very long string to test word break wrapping.",
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Values: []chart.Value{
{Value: 5, Label: "Blue"},
{Value: 5, Label: "Green"},
{Value: 4, Label: "Gray"},
{Value: 3, Label: "Orange"},
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{Value: 3, Label: "Test"},
{Value: 2, Label: "??"},
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{Value: 1, Label: "!!"},
},
},
{
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Name: "Test",
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Values: []chart.Value{
{Value: 10, Label: "Blue"},
{Value: 5, Label: "Green"},
{Value: 1, Label: "Gray"},
},
},
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{
Name: "Test 2",
Values: []chart.Value{
{Value: 10, Label: "Blue"},
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{Value: 6, Label: "Green"},
{Value: 4, Label: "Gray"},
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},
},
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},
}
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res.Header().Set("Content-Type", "image/png")
err := sbc.Render(chart.PNG, res)
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if err != nil {
fmt.Printf("Error rendering chart: %v\n", err)
}
}
func main() {
http.HandleFunc("/", drawChart)
log.Fatal(http.ListenAndServe(":8080", nil))
}