flag to output the avatar data as a json file

README.md

@@ -98,3 +98,7 @@ The left image was generated normally, the right image with disabled anti-aliasi
 ## Disable parallelization
 
 The drawing operation is parallelized by default to make use of multiple processor cores. You can disable this with the `-serial` switch.
+
+## Save avatar data to a JSON file
+
+To save all the data (colors, angles, sizes etc.) to a JSON file, pass `-dataout filename.json`.

main.go

@@ -4,22 +4,24 @@ import (
 	"bufio"
 	"crypto/md5"
 	"encoding/hex"
+	"encoding/json"
 	"flag"
 	"fmt"
-	"github.com/balpha/go-unicornify/unicornify"
 	"image"
 	"image/png"
 	"math/rand"
 	"os"
 	"strings"
 	"time"
+
+	"github.com/balpha/go-unicornify/unicornify"
 )
 
 func main() {
 	var mail, hash string
 	var random, free, zoomOut, nodouble, noshading, nograss, serial bool
 	var size int
-	var outfile string
+	var outfile, datafile string
 
 	flag.StringVar(&mail, "m", "", "the email address for which a unicorn avatar should be generated")
 	flag.StringVar(&hash, "h", "", "the hash for which a unicorn avatar should be generated")
@@ -32,6 +34,7 @@ func main() {
 	flag.BoolVar(&noshading, "noshading", false, "do not add shading, this will make unicorns look flatter")
 	flag.BoolVar(&nograss, "nograss", false, "do not add grass to the ground")
 	flag.BoolVar(&serial, "serial", false, "do not parallelize the drawing")
+	flag.StringVar(&datafile, "dataout", "", "if given, a JSON file of this name will be created with all the unicorn data")
 
 	flag.Parse()
 	inputs := 0
@@ -77,7 +80,7 @@ func main() {
 		fmt.Printf("\r%v%%    ", perc)
 	}
 
-	err, img := unicornify.MakeAvatar(hash, actualSize, !free, zoomOut, !noshading, !nograss && !free, !serial, yCallback)
+	err, img, allData := unicornify.MakeAvatar(hash, actualSize, !free, zoomOut, !noshading, !nograss && !free, !serial, yCallback)
 	fmt.Print("\r    \r")
 	if err != nil {
 		os.Stderr.WriteString("Not a valid hexadecimal number: " + hash + "\n")
@@ -102,6 +105,21 @@ func main() {
 		os.Stderr.WriteString("Error writing to output file\n")
 		os.Exit(1)
 	}
+
+	if datafile != "" {
+		json, err := json.MarshalIndent(allData, "", "  ")
+		if err != nil {
+			os.Stderr.WriteString("Error creating content for data file\n")
+			os.Stderr.WriteString(err.Error())
+
+			os.Exit(1)
+		}
+		err = os.WriteFile(datafile, json, 0o644)
+		if err != nil {
+			os.Stderr.WriteString("Error writing data file\n")
+			os.Exit(1)
+		}
+	}
 }
 
 func mail2hash(mail string) string {

unicornify/avatar.go

@@ -10,11 +10,21 @@ import (
 	pyrand "github.com/balpha/gopyrand"
 )
 
-func MakeAvatar(hash string, size int, withBackground bool, zoomOut bool, shading bool, grass bool, parallelize bool, yCallback func(int)) (error, *image.RGBA) {
+type AllData struct {
+	UnicornData    UnicornData
+	BackgroundData BackgroundData
+	GrassData      GrassData
+	Scale          float64
+	XAngle         float64
+	YAngle         float64
+	FocalLength    float64
+}
+
+func MakeAvatar(hash string, size int, withBackground bool, zoomOut bool, shading bool, grass bool, parallelize bool, yCallback func(int)) (error, *image.RGBA, AllData) {
 	rand := pyrand.NewRandom()
 	err := rand.SeedFromHexString(hash)
 	if err != nil {
-		return err, nil
+		return err, nil, AllData{}
 	}
 
 	data := UnicornData{}
@@ -36,6 +46,7 @@ func MakeAvatar(hash string, size int, withBackground bool, zoomOut bool, shadin
 	abs := rand.RandInt(10, 75)
 	yAngle := float64(90+sign*abs) * DEGREE
 	xAngle := float64(rand.RandInt(-20, 20)) * DEGREE
+	originalXAngle := xAngle
 
 	data.Randomize2(rand)
 	bgdata.Randomize2(rand)
@@ -170,5 +181,15 @@ func MakeAvatar(hash string, size int, withBackground bool, zoomOut bool, shadin
 		DrawTracer(tracer, wv, img, yCallback)
 	}
 
-	return nil, img
+	allData := AllData{
+		UnicornData:    data,
+		BackgroundData: bgdata,
+		GrassData:      grassdata,
+		Scale:          unicornScaleFactor,
+		XAngle:         originalXAngle,
+		YAngle:         yAngle,
+		FocalLength:    focalLength,
+	}
+
+	return nil, img, allData
 }

unicornify/unicorndata.go

@@ -41,7 +41,7 @@ type UnicornData struct {
 	BrowLength         float64
 	BrowMood           float64 // from -1 (angry) to 1 (astonished)
 
-	PoseKind      func(*Unicorn, float64)
+	PoseKind      func(*Unicorn, float64) `json:"-"`
 	PoseKindIndex int
 	PosePhase     float64