module ChunkyPNG::Canvas::Operations

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

Raises:

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

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 to be cropped.
x (Integer) -- The x-coordinate of the top left corner of the image to be cropped.

def crop!(x, y, crop_width, crop_height)
  
  raise ChunkyPNG::OutOfBounds, "Image width is too small!" if crop_width + x > width
  raise ChunkyPNG::OutOfBounds, "Image width is too small!" if crop_height + y > height
  
  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

Instance Methods