package main import ( "net/http" "github.com/wcharczuk/go-chart" "github.com/wcharczuk/go-chart/drawing" ) func drawChart(res http.ResponseWriter, req *http.Request) { /* In this example we set some custom colors for the series and the chart background and canvas. */ graph := chart.Chart{ Background: chart.Style{ FillColor: drawing.ColorBlue, }, Canvas: chart.Style{ FillColor: drawing.ColorFromHex("efefef"), }, Series: []chart.Series{ chart.ContinuousSeries{ Style: chart.Style{ Show: true, //note; if we set ANY other properties, we must set this to true. StrokeColor: drawing.ColorRed, // will supercede defaults FillColor: drawing.ColorRed.WithAlpha(64), // will supercede defaults }, XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0}, YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0}, }, }, } res.Header().Set("Content-Type", "image/png") graph.Render(chart.PNG, res) } func main() { http.HandleFunc("/", drawChart) http.ListenAndServe(":8080", nil) }