chunky_png.md

   1 ---
   2 title: Chunky PNG
   3 category: Ruby libraries
   4 layout: 2017/sheet
   5 ---
   6
   7 ### Loading
   8
   9 ```ruby
  10 image = ChunkyPNG::Image.from_file('file.png')
  11 ```
  12
  13 #### Alternate ways
  14
  15 ```ruby
  16 image = ChunkyPNG::Image.from_blob(File.read('file.png'))
  17 image = ChunkyPNG::Image.from_io(io)
  18 ```
  19
  20 Loads from `file.png`.
  21
  22 ### Saving
  23
  24 ```ruby
  25 image.save('filename.png')
  26 ```
  27
  28 #### Alternate ways
  29
  30 ```ruby
  31 File.open('newfile.png', 'wb') { |io| image.write(io) }
  32 binary_string = image.to_blob
  33 ```
  34
  35 Writes an image to `newfile.png`.
  36
  37 ### Drawing
  38
  39 ```ruby
  40 image[0, 0] = ChunkyPNG::Color.rgba(255, 0,0, 128)
  41 image.line(1, 1, 10, 1, ChunkyPNG::Color.from_hex('#aa007f'))
  42 ```
  43
  44 ### Canvas
  45
  46 ```ruby
  47 crop(x, y, w, h)
  48 ```
  49
  50 ### Transforms
  51
  52 ```ruby
  53 new_image = image.flip_horizontally.rotate_right
  54 ```