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require 'rmagick'
def draw_centers(img, all_four = true)
gc = Magick::Draw.new
gc.fill('white')
gc.stroke('black')
gc.circle(30, 10, 30, 12)
gc.circle(10, 80, 10, 82)
gc.circle(70, 60, 70, 62)
gc.circle(80, 20, 80, 22) if all_four
gc.draw(img)
img
end
imgl = Magick::ImageList.new
img = Magick::Image.new(100, 100)
begin
img2 = img.sparse_color(
Magick::VoronoiColorInterpolate, 30, 10, 'red',
10, 80, 'blue', 70, 60, 'lime', 80, 20, 'yellow'
)
img2['Label'] = 'Voroni'
imgl << draw_centers(img2)
img2 = img.sparse_color(
Magick::ShepardsColorInterpolate, 30, 10, 'red',
10, 80, 'blue', 70, 60, 'lime', 80, 20, 'yellow'
)
img2['Label'] = 'Shepards'
imgl << draw_centers(img2)
img2 = img.sparse_color(
Magick::BilinearColorInterpolate, 30, 10, 'red',
10, 80, 'blue', 70, 60, 'lime', 80, 20, 'yellow'
)
img2['Label'] = 'Bilinear'
imgl << draw_centers(img2)
img2 = img.sparse_color(
Magick::BarycentricColorInterpolate, 30, 10, 'red',
10, 80, 'blue', 70, 60, 'lime'
)
img2['Label'] = 'Barycentric'
imgl << draw_centers(img2, false)
img2 = img.sparse_color(
Magick::InverseColorInterpolate, 30, 10, 'red',
10, 80, 'blue', 70, 60, 'lime'
)
img2['Label'] = 'Barycentric'
imgl << draw_centers(img2, false)
montage = imgl.montage do |options|
options.background_color = 'none'
options.geometry = '100x100+10+10'
options.tile = '2x2'
end
montage.write('sparse_color.png')
rescue NotImplementedError, NameError
img = Magick::Image.read('images/notimplemented.gif').first
img.resize!(240, 272)
img.write('sparse_color.png')
end
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