Add voronoi

1 files changed, 23 insertions, 0 deletions

diff --git a/src/voronoi.sql b/src/voronoi.sql
new file mode 100644
index 0000000..ffe621b
--- /dev/null
+++ b/src/voronoi.sql
@@ -0,0 +1,23 @@
+INSERT OR REPLACE INTO images (id, width, height) VALUES ('voronoi', 400, 400) RETURNING id;
+
+WITH RECURSIVE
+  image AS (SELECT *, 100 AS segments FROM images WHERE id = 'voronoi'),
+  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),
+  points(px, py, count) AS (
+    SELECT 0, 0, 0 UNION ALL
+    SELECT abs(RANDOM())%width, abs(RANDOM())%height, count + 1 FROM points, image WHERE count < segments
+  ),
+  _pixels(x, y, r, g, b) AS (
+    SELECT x, y,
+      0,
+      (SELECT color FROM
+        (SELECT (100*(px + 1)*(py + 1)) % 255 AS color,
+                POW(x - px, 2) + POW(y - py, 2) as distance
+          FROM points ORDER BY distance ASC LIMIT 1)),
+      40
+    FROM vertical, horizontal, image
+  )
+INSERT INTO pixels (image_id, x, y, r, g, b) SELECT 'voronoi', x, y, r, g, b FROM _pixels;