From 5993ea8f6fd4316aee313e1e6fdae2dc7fbab5df Mon Sep 17 00:00:00 2001 From: Akshay Nair Date: Wed, 3 Jun 2026 12:49:35 +0530 Subject: Add circle example --- examples/circle.sql | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 examples/circle.sql (limited to 'examples/circle.sql') diff --git a/examples/circle.sql b/examples/circle.sql new file mode 100644 index 0000000..46874cc --- /dev/null +++ b/examples/circle.sql @@ -0,0 +1,18 @@ +DELETE FROM images WHERE id = 'circle'; +INSERT INTO images (id, width, height) VALUES ('circle', 200, 200) RETURNING id; + +WITH RECURSIVE + image AS (SELECT * FROM images WHERE id = 'circle'), + circle AS (SELECT width/2 AS cx, height/2 AS cy, 80 AS radius FROM image), + 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), + _pixels(x, y, r, g, b) AS (SELECT + x, y, + 150, + 255 * MAX(0, MIN(1, (SELECT POW(x - cx, 2) + POW(y - cy, 2) - POW(radius, 2) FROM circle))), + 150 + FROM vertical, horizontal + ) +INSERT INTO pixels (image_id, x, y, r, g, b) SELECT 'circle', x, y, r, g, b FROM _pixels; -- cgit v1.3.1