go-chart/_examples/twopoint/main.go

package main

import (
	"bytes"
	"log"
	"os"
	//"time"
	"github.com/wcharczuk/go-chart" //exposes "chart"
)

func main() {

	var b float64
	b = 1000

	ts1 := chart.ContinuousSeries{ //TimeSeries{
		Name: "Time Series",
		Style: chart.Style{
			Show: true,
		},

		//XValues: []time.Time{time.Unix(3*b,0),time.Unix(4*b,0),time.Unix(5*b,0),time.Unix(6*b,0),time.Unix(7*b,0),time.Unix(8*b,0),time.Unix(9*b,0),time.Unix(10*b,0)},
		XValues: []float64{10 * b, 20 * b, 30 * b, 40 * b, 50 * b, 60 * b, 70 * b, 80 * b},
		YValues: []float64{1.0, 2.0, 30.0, 4.0, 50.0, 6.0, 7.0, 88.0},
	}

	ts2 := chart.ContinuousSeries{ //TimeSeries{
		Style: chart.Style{
			Show:        true,
			StrokeColor: chart.GetDefaultColor(1),
		},

		XValues: []float64{10 * b, 20 * b, 30 * b, 40 * b, 50 * b, 60 * b, 70 * b, 80 * b},
		YValues: []float64{15.0, 52.0, 30.0, 42.0, 50.0, 26.0, 77.0, 38.0},
	}

	graph := chart.Chart{

		XAxis: chart.XAxis{
			Name:           "The XAxis",
			NameStyle:      chart.StyleShow(),
			Style:          chart.StyleShow(),
			ValueFormatter: chart.TimeMinuteValueFormatter, //TimeHourValueFormatter,
		},

		YAxis: chart.YAxis{
			Name:      "The YAxis",
			NameStyle: chart.StyleShow(),
			Style:     chart.StyleShow(),
		},

		Series: []chart.Series{
			ts1,
			ts2,
		},
	}

	buffer := bytes.NewBuffer([]byte{})
	err := graph.Render(chart.PNG, buffer)
	if err != nil {
		log.Fatal(err)
	}

	fo, err := os.Create("output.png")
	if err != nil {
		panic(err)
	}

	if _, err := fo.Write(buffer.Bytes()); err != nil {
		panic(err)
	}
}