classcaptcha302::CaptchaImpl

sys::Obj
  captcha302::CaptchaImpl : captcha302::CaptchaWriter

A (somewhat lame) captcha writer implementation It is quite configurable and draws a variable number of chars with variable scales It also draws some lines under and over the chars to make it a bit harder to read

bgColor: Color bgColor := Color.white
charLines: const static Int:Line[] charLines := ...
charScale: Range charScale := 4..6
charStroke: Range charStroke := 5..9
chars: virtual override Int[] chars := "ACDEFGHJKLNPRTXY346".chars
Avoiding characters that are look alike like i, l, 1, 0, o etc ..
codeLength: Range codeLength := 4..4
create: virtual override Image302 create(CaptchaCode code)
height: Int height := 100
make: new make(|This? f)
maxBgStrokeSize: Int maxBgStrokeSize := 4
maxFgStrokeSize: Int maxFgStrokeSize := 4
nbBgLines: Int nbBgLines := 10
nbFgLines: Int nbFgLines := 10
next: Int next()
options: virtual override Str:Obj options := ...
r: Random r := Random.makeSecure
randomCode: virtual override CaptchaCode randomCode()
randomColor: Color randomColor(Int alpha := 255)
uniqueColor: Color uniqueColor(Color[] curColors, Int alpha := 200)
get a random color that is not too much like another
width: Int width := 300