photo mosaic blog 3

.go

// 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)
            if err == nil {
                db[name] = averageColor(img)
            } else {
                fmt.Println(":", err, name)
            }
        } else {
            fmt.Println("cannot open file", name, err)
        }
        file.Close()
    }
    fmt.Println("Finished populating tiles db.")
    return db
}