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// Copyright ©2015 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 (
"log"
"golang.org/x/exp/rand"
"gonum.org/v1/plot"
"gonum.org/v1/plot/plotter"
"gonum.org/v1/plot/vg/draw"
)
// ExampleErrors draws points and error bars.
func ExampleErrors() {
rnd := rand.New(rand.NewSource(1))
randomError := func(n int) plotter.Errors {
err := make(plotter.Errors, n)
for i := range err {
err[i].Low = rnd.Float64()
err[i].High = rnd.Float64()
}
return err
}
// randomPoints returns some random x, y points
// with some interesting kind of trend.
randomPoints := func(n int) plotter.XYs {
pts := make(plotter.XYs, n)
for i := range pts {
if i == 0 {
pts[i].X = rnd.Float64()
} else {
pts[i].X = pts[i-1].X + rnd.Float64()
}
pts[i].Y = pts[i].X + 10*rnd.Float64()
}
return pts
}
type errPoints struct {
plotter.XYs
plotter.YErrors
plotter.XErrors
}
n := 15
data := errPoints{
XYs: randomPoints(n),
YErrors: plotter.YErrors(randomError(n)),
XErrors: plotter.XErrors(randomError(n)),
}
p, err := plot.New()
if err != nil {
log.Panic(err)
}
scatter, err := plotter.NewScatter(data)
if err != nil {
log.Panic(err)
}
scatter.Shape = draw.CrossGlyph{}
xerrs, err := plotter.NewXErrorBars(data)
if err != nil {
log.Panic(err)
}
yerrs, err := plotter.NewYErrorBars(data)
if err != nil {
log.Panic(err)
}
p.Add(scatter, xerrs, yerrs)
err = p.Save(200, 200, "testdata/errorBars.png")
if err != nil {
log.Panic(err)
}
}
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