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)
}