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// Copyright ©2016 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package plotter_test
import (
"image/color"
"log"
"time"
"golang.org/x/exp/rand"
"gonum.org/v1/plot"
"gonum.org/v1/plot/plotter"
"gonum.org/v1/plot/vg"
"gonum.org/v1/plot/vg/draw"
)
// Example_timeSeries draws a time series.
func Example_timeSeries() {
rnd := rand.New(rand.NewSource(1))
// xticks defines how we convert and display time.Time values.
xticks := plot.TimeTicks{Format: "2006-01-02\n15:04"}
// randomPoints returns some random x, y points
// with some interesting kind of trend.
randomPoints := func(n int) plotter.XYs {
const (
month = 1
day = 1
hour = 1
min = 1
sec = 1
nsec = 1
)
pts := make(plotter.XYs, n)
for i := range pts {
date := time.Date(2007+i, month, day, hour, min, sec, nsec, time.UTC).Unix()
pts[i].X = float64(date)
pts[i].Y = float64(pts[i].X+10*rnd.Float64()) * 1e-9
}
return pts
}
n := 10
data := randomPoints(n)
p, err := plot.New()
if err != nil {
log.Panic(err)
}
p.Title.Text = "Time Series"
p.X.Tick.Marker = xticks
p.Y.Label.Text = "Number of Gophers\n(Billions)"
p.Add(plotter.NewGrid())
line, points, err := plotter.NewLinePoints(data)
if err != nil {
log.Panic(err)
}
line.Color = color.RGBA{G: 255, A: 255}
points.Shape = draw.CircleGlyph{}
points.Color = color.RGBA{R: 255, A: 255}
p.Add(line, points)
err = p.Save(10*vg.Centimeter, 5*vg.Centimeter, "testdata/timeseries.png")
if err != nil {
log.Panic(err)
}
}
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