export image functionality

go.mod

@@ -5,6 +5,7 @@ go 1.25.6
 require (
 	fyne.io/fyne/v2 v2.7.2
 	github.com/aquilax/go-perlin v1.1.0
+	github.com/chai2010/webp v1.4.0
 	github.com/disintegration/imaging v1.6.2
 	github.com/ojrac/opensimplex-go v1.0.2
 )
@@ -37,9 +38,9 @@ require (
 	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef // indirect
 	github.com/stretchr/testify v1.11.1 // indirect
 	github.com/yuin/goldmark v1.7.8 // indirect
-	golang.org/x/image v0.24.0 // indirect
+	golang.org/x/image v0.35.0 // indirect
 	golang.org/x/net v0.35.0 // indirect
 	golang.org/x/sys v0.30.0 // indirect
-	golang.org/x/text v0.22.0 // indirect
+	golang.org/x/text v0.33.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -6,6 +6,8 @@ github.com/BurntSushi/toml v1.5.0 h1:W5quZX/G/csjUnuI8SUYlsHs9M38FC7znL0lIO+DvMg
 github.com/BurntSushi/toml v1.5.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
 github.com/aquilax/go-perlin v1.1.0 h1:Gg+3jQ24wT4Y5GI7TCRLmYarzUG0k+n/JATFqOimb7s=
 github.com/aquilax/go-perlin v1.1.0/go.mod h1:z9Rl7EM4BZY0Ikp2fEN1I5mKSOJ26HQpk0O2TBdN2HE=
+github.com/chai2010/webp v1.4.0 h1:6DA2pkkRUPnbOHvvsmGI3He1hBKf/bkRlniAiSGuEko=
+github.com/chai2010/webp v1.4.0/go.mod h1:0XVwvZWdjjdxpUEIf7b9g9VkHFnInUSYujwqTLEuldU=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -72,15 +74,15 @@ github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD
 github.com/yuin/goldmark v1.7.8 h1:iERMLn0/QJeHFhxSt3p6PeN9mGnvIKSpG9YYorDMnic=
 github.com/yuin/goldmark v1.7.8/go.mod h1:uzxRWxtg69N339t3louHJ7+O03ezfj6PlliRlaOzY1E=
 golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
-golang.org/x/image v0.24.0 h1:AN7zRgVsbvmTfNyqIbbOraYL8mSwcKncEj8ofjgzcMQ=
+golang.org/x/image v0.35.0 h1:LKjiHdgMtO8z7Fh18nGY6KDcoEtVfsgLDPeLyguqb7I=
-golang.org/x/image v0.24.0/go.mod h1:4b/ITuLfqYq1hqZcjofwctIhi7sZh2WaCjvsBNjjya8=
+golang.org/x/image v0.35.0/go.mod h1:MwPLTVgvxSASsxdLzKrl8BRFuyqMyGhLwmC+TO1Sybk=
 golang.org/x/net v0.35.0 h1:T5GQRQb2y08kTAByq9L4/bz8cipCdA8FbRTXewonqY8=
 golang.org/x/net v0.35.0/go.mod h1:EglIi67kWsHKlRzzVMUD93VMSWGFOMSZgxFjparz1Qk=
 golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
 golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
+golang.org/x/text v0.33.0 h1:B3njUFyqtHDUI5jMn1YIr5B0IE2U0qck04r6d4KPAxE=
-golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY=
+golang.org/x/text v0.33.0/go.mod h1:LuMebE6+rBincTi9+xWTY8TztLzKHc/9C1uBCG27+q8=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

main.go

@@ -12,15 +12,21 @@ import (
 	"os"
 	"path/filepath"
 
+	"image/jpeg"
+	"strings"
+
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/app"
 	"fyne.io/fyne/v2/canvas"
 	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/dialog"
 	"fyne.io/fyne/v2/widget"
+
+	"github.com/chai2010/webp"
 )
 
 func main() {
-	a := app.New()
+	a := app.NewWithID("com.example.rpgcitymaker")
 	a.Settings().SetTheme(&CustomTheme{a.Settings().Theme()})
 	w := a.NewWindow("RPG City Maker")
 	w.Resize(fyne.NewSize(800, 600))
@@ -254,6 +260,9 @@ func main() {
 
 	var generateBtn *widget.Button
 	progressBar := NewTextOverlayProgressBar()
+	exportBtn := widget.NewButton("Export", func() {
+		showSaveDialog(w, canvasImg.Image, settings)
+	})
 
 	generateBtn = widget.NewButton("Generate", func() {
 		go func() {
@@ -437,6 +446,8 @@ func main() {
 		generateBtn,
 		errorLabel,
 		progressBar,
+		widget.NewSeparator(),
+		exportBtn,
 	))
 
 	tabs := container.NewAppTabs(
@@ -464,3 +475,86 @@ func main() {
 	w.SetContent(split)
 	w.ShowAndRun()
 }
+
+func showSaveDialog(win fyne.Window, img image.Image, settings *Settings) {
+	fileNameEntry := widget.NewEntry()
+	fileNameEntry.SetPlaceHolder("image")
+
+	formatSelect := widget.NewSelect([]string{"PNG", "JPG", "WEBP"}, nil)
+	formatSelect.SetSelected("PNG")
+
+	pathLabel := widget.NewLabel(settings.LastExportPath)
+
+	browseBtn := widget.NewButton("Browse", func() {
+		dialog.ShowFolderOpen(func(uri fyne.ListableURI, err error) {
+			if err != nil {
+				log.Println("Error opening folder dialog:", err)
+				return
+			}
+			if uri == nil {
+				return
+			}
+			settings.LastExportPath = uri.Path()
+			pathLabel.SetText(settings.LastExportPath)
+		}, win)
+	})
+
+	content := container.NewVBox(
+		widget.NewLabel("Save to:"),
+		container.NewBorder(nil, nil, nil, browseBtn, pathLabel),
+		widget.NewLabel("Filename:"),
+		fileNameEntry,
+		widget.NewLabel("Format:"),
+		formatSelect,
+	)
+
+	saveDialog := dialog.NewCustom("Export Image", "Cancel", content, win)
+
+	saveBtn := widget.NewButton("Save", func() {
+		fileName := fileNameEntry.Text
+		if fileName == "" {
+			return
+		}
+
+		filePath := filepath.Join(pathLabel.Text, fileName+"."+strings.ToLower(formatSelect.Selected))
+		settings.LastExportPath = filepath.Dir(filePath)
+
+		file, err := os.Create(filePath)
+		if err != nil {
+			log.Println("Error creating file:", err)
+			return
+		}
+		defer file.Close()
+
+		switch formatSelect.Selected {
+		case "PNG":
+			err = png.Encode(file, img)
+		case "JPG":
+			err = jpeg.Encode(file, img, nil)
+		case "WEBP":
+			err = webp.Encode(file, img, &webp.Options{Lossless: true})
+		}
+		if err != nil {
+			log.Println("Failed to encode image:", err)
+		}
+		saveDialog.Hide()
+	})
+	saveBtn.Disable()
+
+	fileNameEntry.OnChanged = func(text string) {
+		if text == "" {
+			saveBtn.Disable()
+		} else {
+			saveBtn.Enable()
+		}
+	}
+
+	saveDialog.SetButtons([]fyne.CanvasObject{
+		widget.NewButton("Cancel", func() {
+			saveDialog.Hide()
+		}),
+		saveBtn,
+	})
+
+	saveDialog.Show()
+}

settings.go

@@ -24,6 +24,7 @@ type Settings struct {
 	MinRiverWidth  float64 `json:"min_river_width"`
 	MaxRiverWidth  float64 `json:"max_river_width"`
 	RiverCurvyness float64 `json:"river_curvyness"`
+	LastExportPath string  `json:"last_export_path"`
 }
 
 func (s *Settings) Save() error {
@@ -58,6 +59,10 @@ func LoadSettings() (*Settings, error) {
 	file, err := os.Open(configFile)
 	if err != nil {
 		if os.IsNotExist(err) {
+			homeDir, err := os.UserHomeDir()
+			if err != nil {
+				homeDir = "."
+			}
 			return &Settings{
 				Detail:         1,
 				Roughness:      0,
@@ -75,6 +80,7 @@ func LoadSettings() (*Settings, error) {
 				MinRiverWidth:  1,
 				MaxRiverWidth:  5,
 				RiverCurvyness: 50,
+				LastExportPath: homeDir,
 			}, nil
 		}
 		return nil, err
@@ -86,5 +92,14 @@ func LoadSettings() (*Settings, error) {
 	if err := decoder.Decode(&settings); err != nil {
 		return nil, err
 	}
+
+	if settings.LastExportPath == "" {
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			homeDir = "."
+		}
+		settings.LastExportPath = homeDir
+	}
+
 	return &settings, nil
 }