func downloadImages(tag string, numImages int, inv *mosaic.ImageInventory) error {
api := instagram.NewClient()
fetcher := instagram.NewTagFetcher(api, tag)
if err := inv.Fetch(fetcher, numImages); err != nil {
return err
}
time.Sleep(1 * time.Second)
return nil
}
func generateMosaic(src image.Image, tag string, units int, solid bool, inv *mosaic.ImageInventory) (image.Image, error) {
var p *mosaic.ImagePalette
if solid {
p = mosaic.NewSolidPalette(palette.WebSafe)
log.Printf("Generating %dx%d solid mosaic with %d colors", units, units, p.NumColors())
} else {
p = mosaic.NewImagePalette(paletteSize)
if err := inv.PopulatePalette(p); err != nil {
return nil, err
}
if p.NumColors() == 0 {
return nil, fmt.Errorf("No images are available")
}
log.Printf("Generating %dx%d %s mosaic with %d colors and %d images\n", units, units, tag, p.NumColors(), p.NumImages())
}
sq := mosaic.ComposeSquare(src, units, unitSize, p)
return mosaic.Shrink(sq, outDownsample), nil
}