package main import ( "bytes" "log" "time" "github.com/wcharczuk/go-chart" "github.com/wcharczuk/go-web" ) func main() { app := web.New() app.SetName("Chart Test Server") app.SetLogger(web.NewStandardOutputLogger()) app.GET("/", func(rc *web.RequestContext) web.ControllerResult { rc.Response.Header().Set("Content-Type", "image/png") now := time.Now() c := chart.Chart{ Title: "A Test Chart", TitleStyle: chart.Style{ Show: true, }, Width: 640, Height: 480, Axes: chart.Style{ Show: true, StrokeWidth: 1.0, }, YRange: chart.Range{ Min: 0.0, Max: 7.0, }, FinalValueLabel: chart.Style{ Show: true, }, Series: []chart.Series{ chart.TimeSeries{ Name: "a", XValues: []time.Time{now.AddDate(0, 0, -4), now.AddDate(0, 0, -3), now.AddDate(0, 0, -2), now.AddDate(0, 0, -1)}, YValues: []float64{2.5, 5.0, 2.0, 3.0}, }, chart.TimeSeries{ Name: "b", XValues: []time.Time{now.AddDate(0, 0, -4), now.AddDate(0, 0, -3), now.AddDate(0, 0, -2), now.AddDate(0, 0, -1)}, YValues: []float64{6.0, 5.0, 4.0, 1.0}, }, }, } buffer := bytes.NewBuffer([]byte{}) err := c.Render(chart.PNG, buffer) if err != nil { return rc.API().InternalError(err) } return rc.Raw(buffer.Bytes()) }) log.Fatal(app.Start()) }