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RSpec.describe Magick::Image, "#chop" do
def build_gray_image
image = Magick::Image.new(3, 3)
pixels = [
[gray(1), gray(2), gray(3)],
[gray(4), gray(5), gray(6)],
[gray(7), gray(8), gray(9)]
]
image.import_pixels(0, 0, 3, 3, "RGB", pixels.flatten)
end
it "removes a cross from the middle of the image" do
image = build_gray_image
new_image = image.chop(1, 1, 1, 1)
expected_pixels = [
[gray(1), gray(3)],
[gray(7), gray(9)]
]
expect(new_image).to match_pixels(expected_pixels)
end
it "removes an L-shape from the bottom left of the image" do
image = build_gray_image
new_image = image.chop(0, 2, 1, 1)
expected_pixels = [
[gray(2), gray(3)],
[gray(5), gray(6)]
]
expect(new_image).to match_pixels(expected_pixels)
end
it "removes 1 column from the middle of the image" do
image = build_gray_image
new_image = image.chop(1, 1, 1, 0)
expected_pixels = [
[gray(1), gray(3)],
[gray(4), gray(6)],
[gray(7), gray(9)]
]
expect(new_image).to match_pixels(expected_pixels)
end
it "removes 1 row from the middle of the image" do
image = build_gray_image
new_image = image.chop(1, 1, 0, 1)
expected_pixels = [
[gray(1), gray(2), gray(3)],
[gray(7), gray(8), gray(9)]
]
expect(new_image).to match_pixels(expected_pixels)
end
it "removes 2 rows and 2 columns from the image" do
image = build_gray_image
new_image = image.chop(0, 0, 2, 2)
expect(new_image).to match_pixels([gray(9)])
end
it "raises an error when x is out of bounds" do
image = build_gray_image
expect { image.chop(5, 1, 1, 1) }.to raise_error(RuntimeError)
end
it "raises an error when y is out of bounds" do
image = build_gray_image
expect { image.chop(1, 5, 1, 1) }.to raise_error(RuntimeError)
end
it "does not raise an error when width or height are out of bounds" do
image = build_gray_image
expect { image.chop(1, 1, 5, 5) }.not_to raise_error
end
it "raises an error when the argument is the wrong type" do
image = build_gray_image
expect { image.chop("hello", 1, 1, 1) }.to raise_error(TypeError)
end
end
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