diff --git a/README.md b/README.md
index 4b5cfa3..7b68f2a 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ func handle(w http.ResponseWriter, r *http.Request) {
```
[documentation](https://godoc.org/github.com/steambap/captcha) |
-[example](example/main.go)
+[example](example/basic/main.go)
## sample image
diff --git a/captcha.go b/captcha.go
index a73fcc7..475d0cd 100644
--- a/captcha.go
+++ b/captcha.go
@@ -36,6 +36,9 @@ type Options struct {
// CurveNumber is the number of curves to draw on captcha image.
// It defaults to 2.
CurveNumber int
+ // FontDPI controls scale of font.
+ // The default is 92.0.
+ FontDPI float64
width int
height int
@@ -47,6 +50,7 @@ func newDefaultOption(width, height int) *Options {
CharPreset: charPreset,
TextLength: 4,
CurveNumber: 2,
+ FontDPI: 92.0,
width: width,
height: height,
}
@@ -184,7 +188,7 @@ func drawSineCurve(img *image.NRGBA, opts *Options) {
func drawText(text string, img *image.NRGBA, opts *Options) error {
ctx := freetype.NewContext()
- ctx.SetDPI(92.0)
+ ctx.SetDPI(opts.FontDPI)
ctx.SetClip(img.Bounds())
ctx.SetDst(img)
ctx.SetHinting(font.HintingFull)
diff --git a/example/index.html b/example/basic/index.html
similarity index 100%
rename from example/index.html
rename to example/basic/index.html
diff --git a/example/main.go b/example/basic/main.go
similarity index 100%
rename from example/main.go
rename to example/basic/main.go
diff --git a/example/load-font/index.html b/example/load-font/index.html
new file mode 100644
index 0000000..cd731d5
--- /dev/null
+++ b/example/load-font/index.html
@@ -0,0 +1,10 @@
+
+
+
+
+ Load Font
+
+
+ 
+
+
\ No newline at end of file
diff --git a/example/load-font/main.go b/example/load-font/main.go
new file mode 100644
index 0000000..40c1d8e
--- /dev/null
+++ b/example/load-font/main.go
@@ -0,0 +1,45 @@
+package main
+
+import (
+ "fmt"
+ "github.com/steambap/captcha"
+ "golang.org/x/image/font/gofont/goregular"
+ "html/template"
+ "net/http"
+)
+
+func main() {
+ err := captcha.LoadFont(goregular.TTF)
+ if err != nil {
+ panic(err)
+ }
+
+ http.HandleFunc("/", indexHandle)
+ http.HandleFunc("/captcha", captchaHandle)
+ fmt.Println("Server start at port 8080")
+ err = http.ListenAndServe(":8080", nil)
+ if err != nil {
+ panic(err)
+ }
+}
+
+func indexHandle(w http.ResponseWriter, _ *http.Request) {
+ doc, err := template.ParseFiles("index.html")
+ if err != nil {
+ fmt.Fprint(w, err.Error())
+ return
+ }
+ doc.Execute(w, nil)
+}
+
+func captchaHandle(w http.ResponseWriter, _ *http.Request) {
+ img, err := captcha.New(150, 50, func(options *captcha.Options) {
+ options.FontDPI = 72.0
+ })
+ if err != nil {
+ fmt.Fprint(w, nil)
+ fmt.Println(err.Error())
+ return
+ }
+ img.WriteTo(w)
+}
\ No newline at end of file