module ChunkyPNG::Canvas::Operations

def crop!(x, y, crop_width, crop_height)

Raises:
  • (ChunkyPNG::OutOfBounds) - when the crop dimensions plus the given

Returns:
  • (ChunkyPNG::Canvas) - Returns itself, but cropped.

Parameters:
  • crop_height (Integer) -- The height of the image to be cropped.
  • crop_width (Integer) -- The width of the image to be cropped.
  • y (Integer) -- The y-coordinate of the top left corner of the image
  • x (Integer) -- The x-coordinate of the top left corner of the image 
def crop!(x, y, crop_width, crop_height)
  if crop_width + x > width
    raise ChunkyPNG::OutOfBounds, 'Original image width is too small!'
  end
  if crop_height + y > height
    raise ChunkyPNG::OutOfBounds, 'Original image height is too small!'
  end
  new_pixels = []
  for cy in 0...crop_height do
    new_pixels += pixels.slice((cy + y) * width + x, crop_width)
  end
  replace_canvas!(crop_width, crop_height, new_pixels)
end