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package main
import (
"fmt"
"math/rand"
"os"
"strconv"
"time"
"github.com/ajstarks/svgo"
)
var canvas = svg.New(os.Stdout)
func main() {
width := 512
height := 256
var n int = 256
var rx, ry int
if len(os.Args) > 1 {
n, _ = strconv.Atoi(os.Args[1])
}
f, _ := os.Open("/dev/urandom")
x := make([]byte, n)
y := make([]byte, n)
f.Read(x)
f.Read(y)
f.Close()
rand.Seed(int64(time.Now().Nanosecond()) % 1e9)
canvas.Start(600, 400)
canvas.Title("Random Integer Comparison")
canvas.Desc("Comparison of Random integers: the random device & the Go rand package")
canvas.Rect(0, 0, width/2, height, "fill:white; stroke:gray")
canvas.Rect(width/2, 0, width/2, height, "fill:white; stroke:gray")
canvas.Desc("Left: Go rand package (red), Right: /dev/urandom")
canvas.Gstyle("stroke:none; fill-opacity:0.5")
for i := 0; i < n; i++ {
rx = rand.Intn(255)
ry = rand.Intn(255)
canvas.Circle(rx, ry, 5, canvas.RGB(127, 0, 0))
canvas.Circle(int(x[i])+255, int(y[i]), 5, "fill:black")
}
canvas.Gend()
canvas.Desc("Legends")
canvas.Gstyle("text-anchor:middle; font-size:18; font-family:Calibri")
canvas.Text(128, 280, "Go rand package", "")
canvas.Text(384, 280, "/dev/urandom")
canvas.Text(256, 280, fmt.Sprintf("n=%d", n), "font-size:12")
canvas.Gend()
canvas.End()
}
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