Dominant Palette Drawer

dominant.go

// Usage: dominant < in > out
package main

import (
	"github.com/hawx/img/utils"
	"github.com/hawx/rgoybiv"
	"image"
	"image/draw"
)

func main() {
	img, exif := utils.ReadStdin()

	palette := rgoybiv.GetPalette(img, nil)

	const (
		rowWidth  = 500
		rowHeight = 75
		rowMargin = 25
		rowCount  = 5
	)

	bounds := image.Rect(0, 0, rowWidth + 2 * rowMargin, rowHeight * rowCount + rowMargin * (rowCount + 1))

	row := image.Rect(rowMargin, rowMargin, rowMargin + rowWidth, rowMargin + rowHeight)

	diff := image.Pt(0, rowMargin + rowHeight)

	out := image.NewRGBA(bounds)
	draw.Draw(out, bounds, image.White, image.ZP, draw.Src)

	for i := 0; i < rowCount; i++ {
		draw.Draw(out, row, &image.Uniform{palette.Colors[i].Value}, image.ZP, draw.Src)
		row = row.Add(diff)
	}

	utils.WriteStdout(out, exif)
}