Yin and yang: Difference between revisions

=={{header|Go}}==

There are some emerging third-party 2D graphics libraries for Go; meanwhile, here is an SVG solution using only standard libraries.

<lang go>package main

import (

"fmt"

"os"

"template"

)

var tmpl = `<?xml version="1.0"?>

<svg xmlns="http://www.w3.org/2000/svg"

xmlns:xlink="http://www.w3.org/1999/xlink">

<symbol id="yy" viewBox="0 0 200 200">

<circle stroke="black" stroke-width="2" fill="white"

cx="100" cy="100" r="99" />

<path fill="black"

d="M100 100 a49 49 0 0 0 0 -98

v-1 a99 99 0 0 1 0 198

v-1 a49 49 0 0 1 0 -98" />

<circle fill="black" cx="100" cy="51" r="17" />

<circle fill="white" cx="100" cy="149" r="17" />

</symbol>

{{range .}}<use xlink:href="#yy"

x="{{.X}}" y="{{.Y}}" width="{{.Sz}}" height="{{.Sz}}"/>

{{end}}</svg>

`

// structure specifies position and size to draw symbol

type xysz struct {

X, Y, Sz int

}

// example data to specify drawing the symbol twice,

// with different position and size.

var yys = []xysz{

{20, 20, 100},

{140, 30, 60},

}

func main() {

xt := template.New("")

template.Must(xt.Parse(tmpl))

f, err := os.Create("yy.svg")

if err != nil {

fmt.Println(err)

return

}

if err := xt.Execute(f, yys); err != nil {

fmt.Println(err)

}

f.Close()

}</lang>