package main import ( "log" "net/http" "git.gutmet.org/go-chart.git" ) func drawChart(res http.ResponseWriter, req *http.Request) { graph := chart.Chart{ Series: []chart.Series{ chart.ContinuousSeries{ 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 drawChartWide(res http.ResponseWriter, req *http.Request) { graph := chart.Chart{ Width: 1920, //this overrides the default. Series: []chart.Series{ chart.ContinuousSeries{ XValues: []float64{1.0, 2.0, 3.0, 4.0}, YValues: []float64{1.0, 2.0, 3.0, 4.0}, }, }, } res.Header().Set("Content-Type", "image/png") graph.Render(chart.PNG, res) } func main() { http.HandleFunc("/", drawChart) http.HandleFunc("/wide", drawChartWide) log.Fatal(http.ListenAndServe(":8080", nil)) }