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Viewing changes to src/github.com/ajstarks/svgo/randcomp/randcomp.go

  • Committer: Package Import Robot
  • Author(s): Curtis C. Hovey
  • Date: 2015-09-29 19:43:29 UTC
  • mfrom: (47.1.4 wily-proposed)
  • Revision ID: package-import@ubuntu.com-20150929194329-9y496tbic30hc7vp
Tags: 1.24.6-0ubuntu1~15.04.1
https://launchpad.net/bugs/1500916
https://launchpad.net/bugs/1497087
Backport of 1.24.6 from wily. (LP: #1500916, #1497087)

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