1 files changed, 24 insertions, 0 deletions
diff --git a/src/polka.sql b/src/polka.sql
new file mode 100644
index 0000000..3d72540
--- /dev/null
+++ b/src/polka.sql
@@ -0,0 +1,24 @@
+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;