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INSERT OR REPLACE INTO images (id, width, height) VALUES ('polka', 400, 400) RETURNING id;
WITH RECURSIVE
image AS (SELECT *, width/10 AS gapx, height/10 AS gapy, 16.0 AS size FROM images WHERE id = 'polka'),
horizontal(x) AS
(SELECT width FROM image UNION ALL SELECT x - 1 FROM horizontal WHERE x > 1),
vertical(y) AS
(SELECT height FROM image UNION ALL SELECT y - 1 FROM vertical WHERE y > 1),
dotsx(dotx, column) AS (
SELECT 0, 0 UNION ALL
SELECT dotx + gapx, column + 1 FROM dotsx, image WHERE dotx < width
),
dotsy(doty, row) AS (
SELECT 0, 0 UNION ALL
SELECT doty + gapy, row + 1 FROM dotsy, image WHERE doty < height
),
_pixels(x, y, r, g, b) AS (
SELECT x, y,
IFNULL((SELECT 60 * abs((row % 5) - (column % 5)) FROM dotsx, dotsy
WHERE POW(x - dotx - gapx*(row%2)/2.0, 2) + POW(y - doty, 2) < size*size LIMIT 1), 0),
50, 70
FROM vertical, horizontal, image
)
INSERT INTO pixels (image_id, x, y, r, g, b) SELECT 'polka', x, y, r, g, b FROM _pixels;
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