sausheong

Keybase proof

I hereby claim:

• I am sausheong on github.
• I am sausheong (https://keybase.io/sausheong) on keybase.
• I have a public key whose fingerprint is E86E 9A36 EF67 3777 3F86 88D3 3592 C89F 5903 A846

To claim this, I am signing this object:

sausheong

// find the average color of the picture
func averageColor(img image.Image) [3]float64 {
    bounds := img.Bounds()
    r, g, b := 0.0, 0.0, 0.0
    for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
        for x := bounds.Min.X; x < bounds.Max.X; x++ {
            r1, g1, b1, _ := img.At(x, y).RGBA()
            r, g, b = r+float64(r1), g+float64(g1), b+float64(b1)
        }
    }

sausheong

// resize an image to its new width
func resize(in image.Image, newWidth int) image.NRGBA {
    bounds := in.Bounds()
    width := bounds.Max.X - bounds.Min.X
    ratio := width / newWidth
    out := image.NewNRGBA(image.Rect(bounds.Min.X/ratio, bounds.Min.X/ratio, bounds.Max.X/ratio, bounds.Max.Y/ratio))
    for y, j := bounds.Min.Y, bounds.Min.Y; y < bounds.Max.Y; y, j = y+ratio, j+1 {
        for x, i := bounds.Min.X, bounds.Min.X; x < bounds.Max.X; x, i = x+ratio, i+1 {
            r, g, b, a := in.At(x, y).RGBA()
            out.SetNRGBA(i, j, color.NRGBA{uint8(r), uint8(g), uint8(b), uint8(a)})

sausheong

// populate a tiles database in memory
func tilesDB() map[string][3]float64 {
    fmt.Println("Start populating tiles db ...")
    db := make(map[string][3]float64)
    files, _ := ioutil.ReadDir("tiles")
    for _, f := range files {
        name := "tiles/" + f.Name()
        file, err := os.Open(name)
        if err == nil {
            img, _, err := image.Decode(file)

sausheong

// find the nearest matching image
func nearest(target [3]float64, db *map[string][3]float64) string {
    var filename string
    smallest := 1000000.0
    for k, v := range *db {
        dist := distance(target, v)
        if dist < smallest {
            filename, smallest = k, dist
        }
    }

sausheong

// find the Eucleadian distance between 2 points
func distance(p1 [3]float64, p2 [3]float64) float64 {
    return math.Sqrt(sq(p2[0]-p1[0]) + sq(p2[1]-p1[1]) + sq(p2[2]-p1[2]))
}
 
// find the square
func sq(n float64) float64 {
    return n * n
}

sausheong

var TILESDB map[string][3]float64
 
// clone the tile database each time we generate the photo mosaic
func cloneTilesDB() map[string][3]float64 {
    db := make(map[string][3]float64)
    for k, v := range TILESDB {
        db[k] = v
    }
    return db
}

sausheong

package main
 
import (
    "fmt"
    "html/template"
    "net/http"
    "bytes"
    "encoding/base64"
    "image"
    "image/draw"

sausheong

// get the content from the POSTed form
r.ParseMultipartForm(10485760) // max body in memory is 10MB
file, _, _ := r.FormFile("image")
defer file.Close()
tileSize, _ := strconv.Atoi(r.FormValue("tile_size"))

sausheong

// decode and get original image
original, _, _ := image.Decode(file)
bounds := original.Bounds()
// create a new image for the mosaic
newimage := image.NewNRGBA(image.Rect(bounds.Min.X, bounds.Min.X, bounds.Max.X, bounds.Max.Y))