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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 (
"image/color"
"log"
"math"
"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"
)
// ExampleScatter_bubbles draws some scatter points.
// Each point is plotted with a different radius size depending on
// external criteria.
func ExampleScatter_bubbles() {
rnd := rand.New(rand.NewSource(1))
// randomTriples returns some random but correlated x, y, z triples
randomTriples := func(n int) plotter.XYZs {
data := make(plotter.XYZs, n)
for i := range data {
if i == 0 {
data[i].X = rnd.Float64()
} else {
data[i].X = data[i-1].X + 2*rnd.Float64()
}
data[i].Y = data[i].X + 10*rnd.Float64()
data[i].Z = data[i].X
}
return data
}
n := 10
scatterData := randomTriples(n)
// Calculate the range of Z values.
minZ, maxZ := math.Inf(1), math.Inf(-1)
for _, xyz := range scatterData {
if xyz.Z > maxZ {
maxZ = xyz.Z
}
if xyz.Z < minZ {
minZ = xyz.Z
}
}
p, err := plot.New()
if err != nil {
log.Panic(err)
}
p.Title.Text = "Bubbles"
p.X.Label.Text = "X"
p.Y.Label.Text = "Y"
sc, err := plotter.NewScatter(scatterData)
if err != nil {
log.Panic(err)
}
// Specify style for individual points.
sc.GlyphStyleFunc = func(i int) draw.GlyphStyle {
c := color.RGBA{R: 196, B: 128, A: 255}
var minRadius, maxRadius = vg.Points(1), vg.Points(20)
rng := maxRadius - minRadius
_, _, z := scatterData.XYZ(i)
d := (z - minZ) / (maxZ - minZ)
r := vg.Length(d)*rng + minRadius
return draw.GlyphStyle{Color: c, Radius: r, Shape: draw.CircleGlyph{}}
}
p.Add(sc)
err = p.Save(200, 200, "testdata/bubbles.png")
if err != nil {
log.Panic(err)
}
}
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