Function Example_logScaleWithAutoRescale

plotter/logscale_example_test.go:48–74

Example_logScaleWithAutoRescale shows how to create a plot with a log-scale on the Y-axis. The Y-axis is instructed to automatically adapt its range according to the underlying Y-ticker.

()

// The Y-axis is instructed to automatically adapt its range according to
// the underlying Y-ticker.
func Example_logScaleWithAutoRescale() {
	p := plot.New()
	p.Title.Text = "My Plot"
	p.Y.Scale = plot.LogScale{}
	p.Y.Tick.Marker = plot.LogTicks{Prec: -1}
	p.Y.AutoRescale = true
	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)

	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/logscale_autorescale.png")
	if err != nil {
		log.Panic(err)
	}
}