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// Copyright ©2017 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 palette_test
import (
"fmt"
"log"
"gonum.org/v1/plot"
"gonum.org/v1/plot/palette"
"gonum.org/v1/plot/palette/moreland"
"gonum.org/v1/plot/plotter"
)
// This example creates a color bar and a second color bar where the
// direction of the colors are reversed.
func ExampleReverse() {
p, err := plot.New()
if err != nil {
log.Panic(err)
}
l := &plotter.ColorBar{ColorMap: moreland.Kindlmann()}
l2 := &plotter.ColorBar{ColorMap: palette.Reverse(moreland.Kindlmann())}
l.ColorMap.SetMin(0.5)
l.ColorMap.SetMax(2.5)
l2.ColorMap.SetMin(2.5)
l2.ColorMap.SetMax(4.5)
p.Add(l, l2)
p.HideY()
p.X.Padding = 0
p.Title.Text = "A ColorMap and its Reverse"
if err = p.Save(300, 48, "testdata/reverse.png"); err != nil {
log.Panic(err)
}
}
// This example creates a color palette from a reversed ColorMap.
func ExampleReverse_palette() {
p, err := plot.New()
if err != nil {
log.Panic(err)
}
thumbs := plotter.PaletteThumbnailers(palette.Reverse(moreland.Kindlmann()).Palette(10))
for i, t := range thumbs {
p.Legend.Add(fmt.Sprint(i), t)
}
p.HideAxes()
p.X.Padding = 0
p.Y.Padding = 0
if err = p.Save(35, 120, "testdata/reverse_palette.png"); err != nil {
log.Panic(err)
}
}
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