108 lines
2.6 KiB
Markdown
108 lines
2.6 KiB
Markdown
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Cutter
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======
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A Go library to crop images.
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[](https://travis-ci.org/oliamb/cutter)
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[](https://godoc.org/github.com/oliamb/cutter)
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Cutter was initially developped to be able
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to crop image resized using github.com/nfnt/resize.
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Usage
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-----
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Read the doc on https://godoc.org/github.com/oliamb/cutter
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Import package with
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```go
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import "github.com/oliamb/cutter"
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```
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Package cutter provides a function to crop image.
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By default, the original image will be cropped at the
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given size from the top left corner.
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```go
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croppedImg, err := cutter.Crop(img, cutter.Config{
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Width: 250,
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Height: 500,
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})
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```
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Most of the time, the cropped image will share some memory
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with the original, so it should be used read only. You must
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ask explicitely for a copy if nedded.
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```go
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croppedImg, err := cutter.Crop(img, cutter.Config{
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Width: 250,
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Height: 500,
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Options: cutter.Copy,
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})
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```
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It is possible to specify the top left position:
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```go
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croppedImg, err := cutter.Crop(img, cutter.Config{
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Width: 250,
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Height: 500,
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Anchor: image.Point{100, 100},
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Mode: cutter.TopLeft, // optional, default value
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})
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```
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The Anchor property can represents the center of the cropped image
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instead of the top left corner:
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```go
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croppedImg, err := cutter.Crop(img, cutter.Config{
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Width: 250,
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Height: 500,
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Mode: cutter.Centered,
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})
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```
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The default crop use the specified dimension, but it is possible
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to use Width and Heigth as a ratio instead. In this case,
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the resulting image will be as big as possible to fit the asked ratio
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from the anchor position.
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```go
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croppedImg, err := cutter.Crop(baseImage, cutter.Config{
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Width: 4,
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Height: 3,
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Mode: cutter.Centered,
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Options: cutter.Ratio&cutter.Copy, // Copy is useless here
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})
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```
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About resize
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------------
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This lib only manage crop and won't resize image, but it works great in combination with [github.com/nfnt/resize](https://github.com/nfnt/resize)
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Contributing
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------------
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I'd love to see your contributions to Cutter. If you'd like to hack on it:
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- fork the project,
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- hack on it,
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- ensure tests pass,
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- make a pull request
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If you plan to modify the API, let's disscuss it first.
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Licensing
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---------
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MIT License, Please see the file called LICENSE.
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Credits
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-------
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Test Picture: Gopher picture from Heidi Schuyt, http://www.flickr.com/photos/hschuyt/7674222278/,
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© copyright Creative Commons(http://creativecommons.org/licenses/by-nc-sa/2.0/)
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Thanks to Urturn(http://www.urturn.com) for the time allocated to develop the library.
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