func kartaPNGHandler(c *context, r *http.Request, w http.ResponseWriter) error {
if r.Method != "GET" {
return errors.New("no such handler")
}
seed := getInt(r, "s", 3, 0, math.MaxUint32)
width := getInt(r, "w", 512, 10, 5120)
height := getInt(r, "h", 512, 10, 5120)
count := getInt(r, "c", 2048, 3, 10000)
iterations := getInt(r, "i", 1, 0, 16)
// Seed the random number generator
rand.Seed(int64(seed))
// Create a new karta
k := karta.New(width, height, count, iterations)
if k.Generate() == nil {
w.Header().Add("Content-Type", "image/png")
err := png.Encode(w, k.Image)
if err != nil {
return err
}
c.logf("Served PNG count=%v width=%v height=%v iterations=%v seed=%v",
count, width, height, iterations, seed)
} else {
return errors.New("could not generate image")
}
return nil
}
func kartaImageProvider(name string, width, height int) image.Image {
if width == 0 {
width = 512
}
if height == 0 {
height = 512
}
count := 512
iterations := 1
// Create a new karta
k := karta.New(width, height, count, iterations)
if k.Generate() == nil {
return k.Image
}
return image.NewRGBA(image.Rect(0, 0, width, height))
}