https://github.com/stumpycr/stumpy_core

Core components for working with images
https://github.com/stumpycr/stumpy_core

computer-graphics crystal image-processing

Last synced: about 2 months ago
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Core components for working with images

• Host: GitHub
• URL: https://github.com/stumpycr/stumpy_core
• Owner: stumpycr
• License: mit
• Created: 2016-09-19T21:44:39.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2023-12-04T18:24:45.000Z (about 1 year ago)
• Last Synced: 2023-12-04T19:46:08.389Z (about 1 year ago)
• Topics: computer-graphics, crystal, image-processing
• Language: Crystal
• Homepage:
• Size: 229 KB
• Stars: 30
• Watchers: 5
• Forks: 9
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# stumpy_core

[Documentation](https://docs.leonrische.me/stumpy_core/)

## Usage

This library is not very useful on its own

but there are a few other libraries

that allow creating a canvas from an image file

or saving one to an image file.

* 

* 

```crystal

require "stumpy_core"

include StumpyCore

rainbow = Canvas.new(256, 256)

(0...255).each do |x|

  (0...255).each do |y|

    # RGBA.from_rgb_n(values, bit_depth) is an internal helper method

    # that creates an RGBA object from a rgb triplet with a given bit depth

    color = RGBA.from_rgb_n(x, y, 255, 8)

    rainbow[x, y] = color

  end

end

# It is also possible to provide a background color,

# the default is transparent black `RGBA.new(0, 0, 0, 0)`

white = Canvas.new(256, 256, RGBA.from_hex("#ffffff"))

# If the colors for all pixels are already known when creating the canvas,

# the block syntax can be used to simplify the code:

rainbow2 = Canvas.new(256, 256) { |x, y| RGBA.from_rgb_n(x, y, 255, 8) }

checkerboard = Canvas.new(256, 256) do |x, y|

  if ((x / 32) + (y / 32)).odd?

    RGBA.from_hex("#ffffff")

  else

    RGBA.from_hex("#000000")

  end

end

spectrum  = Canvas.new(361, 101) { |x, y| RGBA.from_hsl(x, 100, y) }

spectrum2 = Canvas.new(361, 101) { |x, y| RGBA.from_hsba([x, 100, y], 1) }

```

![rainbow image](images/rainbow.png)

![checkerboard image](images/checkerboard.png)

![spectrum image](images/spectrum.png)

![spectrum2 image](images/hsv-spectrum.png)

## Contributors

Thanks goes to these wonderful people ([emoji key](https://github.com/kentcdodds/all-contributors#emoji-key)):

| [
Leon](https://github.com/l3kn)
[💻](https://github.com/l3kn/stumpy_core/commits?author=l3kn "Code") | [
Ian Rash](http://broken-kami.tumblr.com)
[💻](https://github.com/l3kn/stumpy_core/commits?author=redcodefinal "Code") | [
Sam](https://github.com/Demonstrandum)
[💻](https://github.com/l3kn/stumpy_core/commits?author=Demonstrandum "Code") | [
reiswindy](https://github.com/reiswindy)
[📖](https://github.com/l3kn/stumpy_core/commits?author=reiswindy "Documentation") |

| :---: | :---: | :---: | :---: |

This project follows the [all-contributors](https://github.com/kentcdodds/all-contributors) specification. Contributions of any kind welcome!