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package main
import (
"flag"
"fmt"
"math/rand"
"os"
"time"
"github.com/ajstarks/svgo"
)
var (
width = 1200
height = 600
opacity = 0.5
size = 40
niter = 200
canvas = svg.New(os.Stdout)
)
func init() {
flag.IntVar(&size, "s", 40, "bubble size")
flag.IntVar(&niter, "n", 200, "number of iterations")
flag.Float64Var(&opacity, "o", 0.5, "opacity")
flag.Parse()
rand.Seed(int64(time.Now().Nanosecond()) % 1e9)
}
func background(v int) { canvas.Rect(0, 0, width, height, canvas.RGB(v, v, v)) }
func random(howsmall, howbig int) int {
if howsmall >= howbig {
return howsmall
}
return rand.Intn(howbig-howsmall) + howsmall
}
func main() {
var style string
canvas.Start(width, height)
canvas.Title("Bubble Trail")
background(200)
canvas.Gstyle(fmt.Sprintf("fill-opacity:%.2f;stroke:none", opacity))
for i := 0; i < niter; i++ {
x := random(0, width)
y := random(height/3, (height*2)/3)
r := random(0, 10000)
switch {
case r >= 0 && r <= 2500:
style = "fill:rgb(255,255,255)"
case r > 2500 && r <= 5000:
style = "fill:rgb(127,0,0)"
case r > 5000 && r <= 7500:
style = "fill:rgb(127,127,127)"
case r > 7500 && r <= 10000:
style = "fill:rgb(0,0,0)"
}
canvas.Circle(x, y, size, style)
}
canvas.Gend()
canvas.End()
}
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