From cc94370fd1aa334e6511aaf6ccdc0c5e727367f3 Mon Sep 17 00:00:00 2001
From: Ben Burwell <ben@benburwell.com>
Date: Tue, 27 Aug 2019 20:31:01 -0400
Subject: rotate

---
 main.go | 48 +++++++++++++++++++++++++++++++++---------------
 1 file changed, 33 insertions(+), 15 deletions(-)

diff --git a/main.go b/main.go
index 28a859d..e2bd74b 100644
--- a/main.go
+++ b/main.go
@@ -16,24 +16,21 @@ import (
 var usernamePattern = regexp.MustCompile("[a-zA-Z][a-zA-Z0-9]+")
 
 func main() {
-	username := flag.String("username", "", "username to encode as image")
+	username := flag.String("username", "", "username to encode as image (must contain only letters a-zA-Z0-9 and start with a letter)")
 	flag.Parse()
 	if strings.TrimSpace(*username) == "" {
-		fmt.Println("no username")
+		flag.Usage()
 		return
 	}
+
 	if !usernamePattern.MatchString(*username) {
-		fmt.Println("no match")
+		flag.Usage()
 		return
 	}
 
 	seed := hash(*username)
-	err, img := generateImage(seed)
-	if err != nil {
-		fmt.Printf("%v\n", err)
-		return
-	}
-	err, str := encodeImage(img)
+	img := repeat(generateImage(seed))
+	str, err := encodeImage(img)
 	if err != nil {
 		fmt.Printf("%v\n", err)
 		return
@@ -45,7 +42,7 @@ func hash(username string) [32]byte {
 	return sha256.Sum256([]byte(username))
 }
 
-func generateImage(hash [32]byte) (error, image.Image) {
+func generateImage(hash [32]byte) image.Image {
 	img := image.NewNRGBA(image.Rect(0, 0, 5, 5))
 	colorA := color.NRGBA{
 		R: hash[0],
@@ -62,7 +59,7 @@ func generateImage(hash [32]byte) (error, image.Image) {
 	offset := 6
 	for x := 0; x < 5; x++ {
 		for y := 0; y < 5; y++ {
-			on := hash[offset]&0xf0 > 0
+			on := hash[offset] > 127
 			color := colorA
 			if on {
 				color = colorB
@@ -71,13 +68,34 @@ func generateImage(hash [32]byte) (error, image.Image) {
 			offset++
 		}
 	}
-	return nil, img
+	return img
 }
 
-func encodeImage(img image.Image) (error, string) {
+func encodeImage(img image.Image) (string, error) {
 	var b bytes.Buffer
 	if err := png.Encode(&b, img); err != nil {
-		return err, ""
+		return "", err
+	}
+	return base64.StdEncoding.EncodeToString(b.Bytes()), nil
+}
+
+func repeat(img image.Image) image.Image {
+	newImg := image.NewNRGBA(image.Rect(0, 0, 10, 10))
+	for x := 0; x < 5; x++ {
+		for y := 0; y < 5; y++ {
+			newImg.Set(x, y, img.At(x, y))
+			newImg.Set(9-x, y, img.At(x, y))
+			newImg.Set(x, 9-y, img.At(x, y))
+			newImg.Set(9-x, 9-y, img.At(x, y))
+		}
 	}
-	return nil, base64.StdEncoding.EncodeToString(b.Bytes())
+	return newImg
 }
+
+// func makeBigger(img image.Image) image.Image {
+// 	newImg := image.NewNRGBA(image.Rect(0, 0, 200, 200))
+// 	for x := 0; x < 10; x++ {
+// 		for y := 0; y < 10; y++ {
+// 		}
+// 	}
+// }
-- 
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