RingCaptcha

Nov 15, 2023

Changes in this version

+ const BrushOuterRadiusMax

+ const BrushOuterRadiusMin

+ const C1

+ const CaptchaImageMinHeight

+ const CaptchaImageMinWidth

+ const ColourComponentMaxValue

+ const ErrAnomaly

+ const ErrBrushRadiusRatio

+ const ErrCanvasIsTooSmall

+ const ErrDensityCoefficient

+ const ErrDimensions

+ const ErrFAbsentId

+ const ErrFDuplicateId

+ const ErrFFileExtensionMismatch

+ const ErrImageHeightIsNotSet

+ const ErrImageTTLIsNotSet

+ const ErrImageWidthIsNotSet

+ const ErrImagesFolderIsNotSet

+ const ErrImagesHaveDifferentDimensions

+ const FileExtPng

+ const ImageFileExt

+ const ImageFormat

+ const ImageMimeType

+ const KDMax

+ const KDMin

+ const KR

+ const MsgCaptchaManagerStart

+ const MsgCaptchaManagerStop

+ const MsgCleaningImagesFolder

+ const MsgDone

+ const QueryKeyId

+ const RUIDPrefix

+ const RingMaxCount

+ const RingMinCount

+ const RingMinRadius

+ var ColourBlack = BrushColour

+ var ColourBlue = BrushColour

+ var ColourCyan = BrushColour

+ var ColourGreen = BrushColour

+ var ColourMagenta = BrushColour

+ var ColourRed = BrushColour

+ var ColourWhite = BrushColour

+ var ColourYellow = BrushColour

+ func BlendAlphaOverlay(cB, cA float64) (cO float64)

+ func BlendChannelOverlay(cB, cA, aB, aA float64) (cO float64)

+ func BlendColourOverlay(cB, cA color.Color) (cO color.Color)

+ func BlendImages(iB *image.NRGBA, iA *image.NRGBA) (iO *image.NRGBA, err error)

+ func ConvertImageToNRGBA(in image.Image) (out *image.NRGBA)

+ func ConvertImageToRGBA(in image.Image) (out *image.RGBA)

+ func CreateCaptchaImage(w, h uint, useSample bool, blend bool) (canvas *image.NRGBA, ringCount uint, err error)

+ func DegreeToRadian(degree float64) (radian float64)

+ func DrawImageToCanvas(in *image.RGBA, canvas image.Rectangle) (out *image.NRGBA)

+ func DrawLineWithSimpleBrush(canvas *image.NRGBA, br *SimpleBrush, p1, p2 Point2D, blend bool)

+ func DrawRingWithSimpleBrush(canvas *image.NRGBA, br *SimpleBrush, center Point2D, radius float64, ...)

+ func FillCanvasWithColour(canvas *image.NRGBA, col color.Color)

+ func FillCanvasWithHGradient(canvas *image.NRGBA, cL, cR BrushColour) (err error)

+ func FillCanvasWithVGradient(canvas *image.NRGBA, cT, cB BrushColour) (err error)

+ func GetColorComponentsPM(c color.Color) (r, g, b, a float64)

+ func GetColorComponentsS(c color.Color) (r, g, b, a float64)

+ func GetImageFromFilePath(filePath string) (img image.Image, err error)

+ func MakeRGBA64(r, g, b, a float64) color.RGBA64

+ func MinInt(a, b int) (min int)

+ func MinUint(a, b uint) (min uint)

+ func RadianToDegree(radian float64) (degree float64)

+ func SaveImageAsPngFile(img image.Image, filePath string) (err error)

+ func UseSimpleBrush(canvas *image.NRGBA, brush *SimpleBrush, blend bool, u Point2D)

+ func UseSimpleBrushS(canvas *image.NRGBA, brush *SimpleBrush, blend bool, u Point2D)

+ func UseSolidBrush(canvas *image.NRGBA, brush *SolidBrush, u Point2D)

+ type BrushColour struct

+ A float64

+ B float64

+ G float64

+ R float64

+ func (bc BrushColour) PremultipliedToStraight() (out BrushColour)

+ func (bc BrushColour) RGBA() (r, g, b, a uint32)

+ func (bc BrushColour) StraightToPremultiplied() (out BrushColour)

+ type CaptchaManager struct

+ func NewCaptchaManager(storeImages bool, imagesFolder string, imageWidth uint, imageHeight uint, ...) (cm *CaptchaManager, err error)

+ func (cm *CaptchaManager) CheckCaptcha(req *CheckCaptchaRequest) (resp *CheckCaptchaResponse, err error)

+ func (cm *CaptchaManager) ClearJunk() (err error)

+ func (cm *CaptchaManager) CreateCaptcha() (resp *CreateCaptchaResponse, err error)

+ func (cm *CaptchaManager) GetListenDsn() (dsn string)

+ func (cm *CaptchaManager) Stop() (err error)

+ type CheckCaptchaRequest struct

+ TaskId string

+ Value uint

+ type CheckCaptchaResponse struct

+ IsSuccess bool

+ TaskId string

+ type CreateCaptchaResponse struct

+ ImageData []byte

+ ImageFormat string

+ IsImageDataReturned bool

+ TaskId string

+ type Distance = float64

+ func Distance2D(a, b Point2D) (s Distance)

+ type Point2D struct

+ X float64

+ Y float64

+ type Registry struct

+ func NewRegistry(storeImages bool, imagesFolder string, recordTTLSec uint) *Registry

+ func (r *Registry) AddRecord(id string, answer uint) (err error)

+ func (r *Registry) CheckCaptcha(id string, value uint) (ok bool, err error)

+ func (r *Registry) ClearJunk() (err error)

+ func (r *Registry) GetSize() (size int)

+ func (r *Registry) IsIdRegistered(id string) (isRegistered bool)

+ func (r *Registry) ReadFile(id string) (data []byte, err error)

+ type RegistryRecord struct

+ Answer uint

+ Id string

+ ToC time.Time

+ type SimpleBrush struct

+ Colour BrushColour

+ InnerRadius float64

+ OuterRadius float64

+ func (sb *SimpleBrush) GetSample() (sample *image.NRGBA)

+ type SolidBrush struct

+ Colour BrushColour

+ InnerRadius float64