package main import ( "image/color" "log" "net/http" "github.com/wcharczuk/go-chart" "github.com/wcharczuk/go-web" ) func chartHandler(rc *web.RequestContext) web.ControllerResult { format, err := rc.RouteParameter("format") if err != nil { format = "png" } if format == "png" { rc.Response.Header().Set("Content-Type", "image/png") } else { rc.Response.Header().Set("Content-Type", "image/svg+xml") } c := chart.Chart{ Title: "A Test Chart", TitleStyle: chart.Style{ Show: true, FontSize: 26.0, }, 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.ContinuousSeries{ Name: "a", XValues: []float64{1.0, 2.0, 3.0, 4.0}, YValues: []float64{2.5, 5.0, 2.0, 3.3}, Style: chart.Style{ FillColor: color.RGBA{R: 0, G: 116, B: 217, A: 255}, }, }, chart.ContinuousSeries{ Name: "b", XValues: []float64{3.0, 4.0, 5.0, 6.0}, YValues: []float64{6.0, 5.0, 4.0, 1.0}, }, }, } if format == "png" { err = c.Render(chart.PNG, rc.Response) } else { err = c.Render(chart.SVG, rc.Response) } if err != nil { return rc.API().InternalError(err) } rc.Response.WriteHeader(http.StatusOK) return nil } func main() { app := web.New() app.SetName("Chart Test Server") app.SetLogger(web.NewStandardOutputLogger()) app.GET("/", chartHandler) app.GET("/:format", chartHandler) log.Fatal(app.Start()) }