convert

Documentation

Overview

Package convert can convert a image to ascii string or matrix

Index

• Variables
• func OpenImageFile(imageFilename string) (image.Image, error)
• type Converter
• type ImageConverter
  • func NewImageConverter() *ImageConverter
  • func (converter *ImageConverter) Image2ASCIIMatrix(image image.Image, imageConvertOptions *Options) []string
  • func (converter *ImageConverter) Image2ASCIIString(image image.Image, options *Options) string
  • func (converter *ImageConverter) Image2CharPixelMatrix(image image.Image, imageConvertOptions *Options) [][]ascii.CharPixel
  • func (converter *ImageConverter) ImageFile2ASCIIMatrix(imageFilename string, option *Options) []string
  • func (converter *ImageConverter) ImageFile2ASCIIString(imageFilename string, option *Options) string
  • func (converter *ImageConverter) ImageFile2CharPixelMatrix(imageFilename string, imageConvertOptions *Options) [][]ascii.CharPixel
• type ImageResizeHandler
  • func (handler *ImageResizeHandler) CalcFitSize(width, height, toBeFitWidth, toBeFitHeight float64) (fitWidth, fitHeight int)
  • func (handler *ImageResizeHandler) CalcFitSizeRatio(width, height, imageWidth, imageHeight float64) (ratio float64)
  • func (handler *ImageResizeHandler) CalcProportionalFittingScreenSize(image image.Image) (newWidth, newHeight int, err error)
  • func (handler *ImageResizeHandler) ScaleHeightByRatio(height float64, ratio float64) int
  • func (handler *ImageResizeHandler) ScaleImage(image image.Image, options *Options) (newImage image.Image)
  • func (handler *ImageResizeHandler) ScaleWidthByRatio(width float64, ratio float64) int
• type Options
• type ResizeHandler
  • func NewResizeHandler() ResizeHandler

Examples

• ImageConverter.ImageFile2ASCIIString
• ImageResizeHandler.ScaleImage

Variables

var DefaultOptions = Options{
	Ratio:           1,
	FixedWidth:      -1,
	FixedHeight:     -1,
	FitScreen:       true,
	Colored:         true,
	Reversed:        false,
	StretchedScreen: false,
}

DefaultOptions for convert image

Functions

func OpenImageFile

func OpenImageFile(imageFilename string) (image.Image, error)

OpenImageFile open a image and return a image object

Types

type Converter

type Converter interface {
	Image2ASCIIMatrix(image image.Image, imageConvertOptions *Options) []string
	Image2ASCIIString(image image.Image, options *Options) string
	ImageFile2ASCIIMatrix(imageFilename string, option *Options) []string
	ImageFile2ASCIIString(imageFilename string, option *Options) string
	Image2PixelASCIIMatrix(image image.Image, imageConvertOptions *Options) [][]ascii.CharPixel
	ImageFile2PixelASCIIMatrix(image image.Image, imageConvertOptions *Options) [][]ascii.CharPixel
}

Converter define the convert image basic operations

type ImageConverter

type ImageConverter struct {
	// contains filtered or unexported fields
}

ImageConverter implement the Convert interface, and responsible to image conversion

func NewImageConverter

func NewImageConverter() *ImageConverter

NewImageConverter create a new image converter

func (*ImageConverter) Image2ASCIIMatrix

func (converter *ImageConverter) Image2ASCIIMatrix(image image.Image, imageConvertOptions *Options) []string

Image2ASCIIMatrix converts a image to ASCII matrix

func (*ImageConverter) Image2ASCIIString

func (converter *ImageConverter) Image2ASCIIString(image image.Image, options *Options) string

Image2ASCIIString converts a image to ascii matrix, and the join the matrix to a string

func (*ImageConverter) Image2CharPixelMatrix

func (converter *ImageConverter) Image2CharPixelMatrix(image image.Image, imageConvertOptions *Options) [][]ascii.CharPixel

Image2CharPixelMatrix convert a image to a pixel ascii matrix

func (*ImageConverter) ImageFile2ASCIIMatrix

func (converter *ImageConverter) ImageFile2ASCIIMatrix(imageFilename string, option *Options) []string

ImageFile2ASCIIMatrix converts a image file to ascii matrix

func (*ImageConverter) ImageFile2ASCIIString

func (converter *ImageConverter) ImageFile2ASCIIString(imageFilename string, option *Options) string

ImageFile2ASCIIString converts a image file to ascii string

Example

ExampleImage2ASCIIMatrix is example

converter := NewImageConverter()
imageFilename := "testdata/3x3_white.png"
convertOptions := DefaultOptions
convertOptions.FitScreen = false
convertOptions.Colored = false
asciiString := converter.ImageFile2ASCIIString(imageFilename, &convertOptions)
fmt.Println(asciiString)
/* Output:
@@@
@@@
@@@
*/

Output:

@@@
@@@
@@@

func (*ImageConverter) ImageFile2CharPixelMatrix

func (converter *ImageConverter) ImageFile2CharPixelMatrix(imageFilename string, imageConvertOptions *Options) [][]ascii.CharPixel

ImageFile2CharPixelMatrix convert a image to a pixel ascii matrix

type ImageResizeHandler

type ImageResizeHandler struct {
	// contains filtered or unexported fields
}

ImageResizeHandler implement the ResizeHandler interface and responsible for image resizing

func (*ImageResizeHandler) CalcFitSize

func (handler *ImageResizeHandler) CalcFitSize(width, height, toBeFitWidth, toBeFitHeight float64) (fitWidth, fitHeight int)

CalcFitSize through the given length and width , Calculation is able to match the length and width of the specified size, and is proportional scaling.

func (*ImageResizeHandler) CalcFitSizeRatio

func (handler *ImageResizeHandler) CalcFitSizeRatio(width, height, imageWidth, imageHeight float64) (ratio float64)

CalcFitSizeRatio through the given length and width, the computation can match the optimal scaling ratio of the length and width. In other words, it is able to give a given size rectangle to contain pictures Either match the width first, then scale the length equally, or match the length first, then scale the height equally. More detail please check the example

func (*ImageResizeHandler) CalcProportionalFittingScreenSize

func (handler *ImageResizeHandler) CalcProportionalFittingScreenSize(image image.Image) (newWidth, newHeight int, err error)

CalcProportionalFittingScreenSize proportional scale the image so that the terminal can just show the picture.

func (*ImageResizeHandler) ScaleHeightByRatio

func (handler *ImageResizeHandler) ScaleHeightByRatio(height float64, ratio float64) int

ScaleHeightByRatio scaled the height by ratio

func (*ImageResizeHandler) ScaleImage

func (handler *ImageResizeHandler) ScaleImage(image image.Image, options *Options) (newImage image.Image)

ScaleImage resize the convert to expected size base on the convert options

Example

ExampleScaleImage is scale image example

handler := NewResizeHandler()
imageFilePath := "testdata/cat_2000x1500.jpg"
img, err := OpenImageFile(imageFilePath)
if err != nil {
	log.Fatal("open image file " + imageFilePath + " failed")
}

options := DefaultOptions
options.Colored = false
options.FixedWidth = 200
options.FixedHeight = 100

scaledImage := handler.ScaleImage(img, &options)
sz := scaledImage.Bounds()
fmt.Print(sz.Max.X, sz.Max.Y)

Output:

200 100

func (*ImageResizeHandler) ScaleWidthByRatio

func (handler *ImageResizeHandler) ScaleWidthByRatio(width float64, ratio float64) int

ScaleWidthByRatio scaled the width by ratio

type Options

type Options struct {
	Ratio           float64
	FixedWidth      int
	FixedHeight     int
	FitScreen       bool // only work on terminal
	StretchedScreen bool // only work on terminal
	Colored         bool // only work on terminal
	Reversed        bool
}

Options to convert the image to ASCII

type ResizeHandler

type ResizeHandler interface {
	ScaleImage(image image.Image, options *Options) (newImage image.Image)
}

ResizeHandler define the operation to resize a image

func NewResizeHandler

func NewResizeHandler() ResizeHandler

NewResizeHandler create a new resize handler