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// Copyright ©2018 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"
"math"
"gonum.org/v1/plot"
"gonum.org/v1/plot/plotter"
"gonum.org/v1/plot/vg"
)
func Example_invertedScale() {
// This example is nearly identical to the LogScale, other than
// both the X and Y axes are inverted. InvertedScale expects to act
// on another Normalizer - which should allow for more flexibility
p, err := plot.New()
if err != nil {
log.Fatal(err)
}
p.Title.Text = "Example of inverted axes"
p.Y.Scale = plot.InvertedScale{Normalizer: plot.LogScale{}}
p.X.Scale = plot.InvertedScale{Normalizer: plot.LinearScale{}}
p.Y.Tick.Marker = plot.LogTicks{}
p.X.Label.Text = "x"
p.Y.Label.Text = "f(x)"
f := plotter.NewFunction(math.Exp)
f.XMin = 0.2
f.XMax = 10
f.Color = color.RGBA{R: 255, A: 255}
p.Add(f, plotter.NewGrid())
p.Legend.Add("exp(x)", f)
// Neither .Min nor .Max for the X and Y axes are 'swapped'.
// The minimal value is retained in .Min, and the maximal
// value stays in .Max.
p.X.Min = f.XMin
p.X.Max = f.XMax
p.Y.Min = math.Exp(f.XMin)
p.Y.Max = math.Exp(f.XMax)
err = p.Save(10*vg.Centimeter, 10*vg.Centimeter, "testdata/invertedlogscale.png")
if err != nil {
log.Panic(err)
}
}
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