package main

import (
	"net/http"

	chart "github.com/wcharczuk/go-chart"
)

func drawChart(res http.ResponseWriter, req *http.Request) {

	/*
	   The below will draw the same chart as the `basic` example, except with both the x and y axes turned on.
	   In this case, both the x and y axis ticks are generated automatically, the x and y ranges are established automatically, the canvas "box" is adjusted to fit the space the axes occupy so as not to clip.
	*/

	graph := chart.Chart{
		XAxis: chart.XAxis{
			Name:      "The XAxis",
			NameStyle: chart.StyleShow(),
			Style:     chart.StyleShow(),
		},
		YAxis: chart.YAxis{
			Name:      "The YAxis",
			NameStyle: chart.StyleShow(),
			Style:     chart.StyleShow(),
		},
		Series: []chart.Series{
			chart.ContinuousSeries{
				Style: chart.Style{
					Show:        true,
					StrokeColor: chart.GetDefaultColor(0).WithAlpha(64),
					FillColor:   chart.GetDefaultColor(0).WithAlpha(64),
				},
				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)
}