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artwork.go
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artwork.go
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package pix
import (
"fmt"
"image/png"
"log"
"os"
"path"
"runtime"
"strconv"
"strings"
)
func Generate(input string, width int, height int, whitePercent int, color int, random int, reverse bool, sweep bool, seed int64, compress int, seedsString string, generateVideo bool) {
seeds := generateSeeds(seedsString)
output := ""
compressionLevel := png.CompressionLevel(compress)
image := new(int)
*image = 100 - color
wd, err := os.Getwd()
if err != nil {
log.Fatalf("Could not get working directory: %v", err)
}
output = path.Join(wd, "output.png")
// Parse the output path into components in order to synthesize variation outputs
dir, file := path.Split(output)
ext := path.Ext(file)
name := "output"
img, err := LoadImage(input)
if err != nil {
log.Fatalf("failed to load image: %v", err)
}
w, h := width, height
// Configure parameter values to cartesian-product over. If the -sweep option
// was specified, use the presets; otherwise, use the user-provided or default values.
var imageSweep, randomSweep []int
var seedsSweep [][]int
var reverseSweep []bool
if sweep {
imageSweep = []int{10, 90}
randomSweep = []int{0, 10}
reverseSweep = []bool{true, false}
seedsSweep = [][]int{{w / 2, h / 2}, {0, h - 1}, {w / 2, 0, 0, h / 2, w / 2, h - 1, w - 1, h / 2}}
} else {
imageSweep = []int{*image}
randomSweep = []int{random}
reverseSweep = []bool{reverse}
seedsSweep = [][]int{seeds}
}
// Launch a number of parallel jobs equal to the number of CPUs, then wait for them to finish.
numJobs := len(imageSweep) * len(randomSweep) * len(reverseSweep) * len(seedsSweep)
jobs := make(chan Work, numJobs)
results := make(chan bool, numJobs)
numWorkers := runtime.NumCPU()
if numWorkers > numJobs {
numWorkers = numJobs
}
for id := 0; id <= numWorkers; id++ {
go worker(id, jobs, results)
}
// Sample colors from the image
colors := SampleColors(img, (100-whitePercent)*w*h/100)
// Generate variations
for _, image := range imageSweep {
for _, random := range randomSweep {
for _, reverse := range reverseSweep {
// sort once per unique set of sort parameters
sortedColors := make([]SampledColor, len(colors))
copy(sortedColors, colors)
sortOpts := SortOptions{
Image: float64(image),
Color: float64(100 - image),
Random: float64(random),
Reverse: reverse,
}
SortBySimilarity(sortedColors, sortOpts)
for _, seeds := range seedsSweep {
if len(seeds) == 0 {
seeds = []int{w / 2, h / 2}
}
opts := Options{
Width: w,
Height: h,
Seeds: seeds,
Sort: sortOpts,
RandomSeed: seed,
CompressionLevel: compressionLevel,
Video: generateVideo,
Output: path.Join(dir, name+ext),
}
status := fmt.Sprintf("generating image: colorsort: %v, random: %v, reverse: %v\n", sortOpts.Color, sortOpts.Random, sortOpts.Reverse)
jobs <- Work{sortedColors, opts, status}
}
}
}
}
close(jobs)
for n := 0; n < numJobs; n++ {
<-results
}
}
func generateSeeds(s string) []int {
var seeds []int
pieces := strings.Split(s, " ")
for _, piece := range pieces {
n, err := strconv.ParseInt(piece, 10, 16)
if err != nil {
return nil
}
seeds = append(seeds, int(n))
}
if len(seeds)%2 == 1 {
//fmt.Errorf("seeds must specify an even number of coordinates")
return nil
}
return seeds
}
type Work struct {
colors []SampledColor
opts Options
status string
}
func worker(id int, jobs <-chan Work, results chan<- bool) {
for j := range jobs {
colors, opts := j.colors, j.opts
fmt.Print(j.status)
err := Place(colors, opts)
if err != nil {
fmt.Printf("!!! error placing pixels: %v\n", err)
results <- false
} else {
results <- true
}
}
}