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// lewitt: inspired by by Sol LeWitt's Wall Drawing 91:
//
// A six-inch (15 cm) grid covering the wall.
// Within each square, not straight lines from side to side, using
// red, yellow and blue pencils. Each square contains at least
// one line of each color.
//
// This version violates the original instructions in that straight lines
// as well as arcs are used
package main
import (
"flag"
"fmt"
"math/rand"
"os"
"time"
"github.com/ajstarks/svgo"
)
var canvas = svg.New(os.Stdout)
const tilestyle = `stroke-width:1; stroke:rgb(128,128,128); stroke-opacity:0.5; fill:white`
const penstyle = `stroke:rgb%s; fill:none; stroke-opacity:%.2f; stroke-width:%d`
var width = 720
var height = 720
var nlines = flag.Int("n", 20, "number of lines/square")
var nw = flag.Int("w", 3, "maximum pencil width")
var pencils = []string{"(250, 13, 44)", "(247, 212, 70)", "(52, 114, 245)"}
func background(v int) { canvas.Rect(0, 0, width, height, canvas.RGB(v, v, v)) }
func lewitt(x int, y int, gsize int, n int, w int) {
var x1, x2, y1, y2 int
var op float64
canvas.Rect(x, y, gsize, gsize, tilestyle)
for i := 0; i < n; i++ {
choice := rand.Intn(len(pencils))
op = float64(random(1, 10)) / 10.0
x1 = random(x, x+gsize)
y1 = random(y, y+gsize)
x2 = random(x, x+gsize)
y2 = random(y, y+gsize)
if random(0, 100) > 50 {
canvas.Line(x1, y1, x2, y2, fmt.Sprintf(penstyle, pencils[choice], op, random(1, w)))
} else {
canvas.Arc(x1, y1, gsize, gsize, 0, false, true, x2, y2, fmt.Sprintf(penstyle, pencils[choice], op, random(1, w)))
}
}
}
func random(howsmall, howbig int) int {
if howsmall >= howbig {
return howsmall
}
return rand.Intn(howbig-howsmall) + howsmall
}
func init() {
flag.Parse()
rand.Seed(int64(time.Now().Nanosecond()) % 1e9)
}
func main() {
canvas.Start(width, height)
canvas.Title("Sol Lewitt's Wall Drawing 91")
background(255)
gsize := 120
nc := width / gsize
nr := height / gsize
for cols := 0; cols < nc; cols++ {
for rows := 0; rows < nr; rows++ {
lewitt(cols*gsize, rows*gsize, gsize, *nlines, *nw)
}
}
canvas.End()
}
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