/
util.go
99 lines (83 loc) · 2.15 KB
/
util.go
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package main
import (
"image"
"net/http"
"os"
"strconv"
_ "image/jpeg"
_ "image/png"
"github.com/faiface/beep"
"github.com/faiface/beep/mp3"
"github.com/faiface/pixel"
)
// makeSpriteMap makes slice of sprites from a spritesheet
func makeSpriteMap(spritesheet pixel.Picture, frameWidth, frameHeight float64) []pixel.Rect {
var itemFrames []pixel.Rect
for x := spritesheet.Bounds().Min.X; x < spritesheet.Bounds().Max.X; x += frameWidth {
for y := spritesheet.Bounds().Min.Y; y < spritesheet.Bounds().Max.Y; y += frameHeight {
itemFrames = append(itemFrames, pixel.R(x, y, x+frameWidth, y+frameHeight))
}
}
return itemFrames
}
// loadPicture Loads picture data from path
func loadPicture(path string) (pixel.Picture, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
return nil, err
}
return pixel.PictureDataFromImage(img), nil
}
// loadPicture Loads picture data from path
func loadPictureURL(url string) (pixel.Picture, error) {
resp, err := http.Get(url)
if err != nil {
return nil, err
}
defer resp.Body.Close()
img, _, err := image.Decode(resp.Body)
if err != nil {
return nil, err
}
return pixel.PictureDataFromImage(img), nil
}
// Load the sound in buffer and returns the SoundSeeker and format
// How to use:
// format, coinSound = loadMP3Sound("assets/coin.mp3")
// speaker.Init(format.SampleRate, format.SampleRate.N(time.Second/10))
// speaker.Play(tickSound)
// tickSound.Seek(0)
func loadMP3Sound(filePath string) (beep.Format, beep.StreamSeeker) {
f, err := os.Open(filePath)
panicIfError(err)
streamer, format, err := mp3.Decode(f)
panicIfError(err)
buffer := beep.NewBuffer(format)
buffer.Append(streamer)
streamer.Close()
return format, buffer.Streamer(0, buffer.Len())
}
func getEnvStr(key, defaultVal string) string {
if v, ok := os.LookupEnv(key); ok {
return v
}
return defaultVal
}
func getEnvInt(key string, defaultVal int) int {
if v, ok := os.LookupEnv(key); ok {
i, err := strconv.Atoi(v)
panicIfError(err)
return i
}
return defaultVal
}
func panicIfError(err error) {
if err != nil {
panic(err)
}
}