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add: font DPI option 

update: examples
This commit is contained in:
Weilin Shi 2017-10-07 16:13:12 +08:00
parent 32fccd9c5c
commit b25acadd0a
6 changed files with 61 additions and 2 deletions
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2
README.md
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@ -33,7 +33,7 @@ func handle(w http.ResponseWriter, r *http.Request) {
``` ```
[documentation](https://godoc.org/github.com/steambap/captcha) | [documentation](https://godoc.org/github.com/steambap/captcha) |
[example](example/main.go) [example](example/basic/main.go)
## sample image ## sample image
![image](example/captcha.png) ![image](example/captcha.png)

6
captcha.go
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@ -36,6 +36,9 @@ type Options struct {
// CurveNumber is the number of curves to draw on captcha image. // CurveNumber is the number of curves to draw on captcha image.
// It defaults to 2. // It defaults to 2.
CurveNumber int CurveNumber int
// FontDPI controls scale of font.
// The default is 92.0.
FontDPI float64
width int width int
height int height int
@ -47,6 +50,7 @@ func newDefaultOption(width, height int) *Options {
CharPreset: charPreset, CharPreset: charPreset,
TextLength: 4, TextLength: 4,
CurveNumber: 2, CurveNumber: 2,
FontDPI: 92.0,
width: width, width: width,
height: height, height: height,
} }
@ -184,7 +188,7 @@ func drawSineCurve(img *image.NRGBA, opts *Options) {
func drawText(text string, img *image.NRGBA, opts *Options) error { func drawText(text string, img *image.NRGBA, opts *Options) error {
ctx := freetype.NewContext() ctx := freetype.NewContext()
ctx.SetDPI(92.0) ctx.SetDPI(opts.FontDPI)
ctx.SetClip(img.Bounds()) ctx.SetClip(img.Bounds())
ctx.SetDst(img) ctx.SetDst(img)
ctx.SetHinting(font.HintingFull) ctx.SetHinting(font.HintingFull)

0
example/index.html → example/basic/index.html
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0
example/main.go → example/basic/main.go
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10
example/load-font/index.html Normal file
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@ -0,0 +1,10 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Load Font</title>
</head>
<body>
<img src="/captcha" alt="captcha">
</body>
</html>

45
example/load-font/main.go Normal file
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@ -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)
}