Hello, I'd like to rotate, scale, ... images by moving pixels using affine transformations. For example, the get a points x, y position after a translating it by m, n pixels, you can just add m resp n to x and y:
x' = x + m y' = y + n So the task is basically just to iterate over the images pixels. This was done by directly accessing the Pix-slice <https://golang.org/pkg/image/#Paletted>, but not every every in-memory image has this field. The current solution uses reflection and is extracting the Set function (and, as a nice side effect, a new image with the same type and resolution as the input image): func getSet(im image.Image) (func(int, int, color.Color), image.Image, error ) { set := func(x, y int, c color.Color) {} switch tmp := im.(type) { case *image.Alpha: im = image.NewAlpha(tmp.Rect) set = im.(*image.Alpha).Set ... default: return nil, nil, fmt.Errorf("%T has no function Set", im) } return set, im, nil } My favourited approach would be to use an interface which adds Set it to image.Image. This works, but I obviously can't just throw an image.Image in. type ImageSetter interface { image.Image Set(int, int, color.Color) } What would be a go-like solution for this task? -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
