odbtest/test/gonum/04-draw-dot.go

package main

import (
	"math/rand"

	"gonum.org/v1/plot"
	"gonum.org/v1/plot/plotter"
	"gonum.org/v1/plot/vg"
	"gonum.org/v1/plot/vg/draw"
)

func main() {
	points := plotter.XYs{}
	for i := 0; i < 10; i++ {
		points = append(points, plotter.XY{
			X: 100 * rand.Float64(),
			Y: 100 * rand.Float64(),
		})
	}

	scatter, err := plotter.NewScatter(points)
	if err != nil {
		panic(err)
	}
	scatter.Shape = draw.CircleGlyph{}

	plt := plot.New()
	
	plt.Y.Min, plt.X.Min, plt.Y.Max, plt.X.Max = 0, 0, 100, 100

	plt.Add(scatter)

	if err := plt.Save(5*vg.Inch, 5*vg.Inch, "04-draw-dot.png"); err != nil {
		panic(err)
	}
}