From ccc0b975a16acb458f2e44b39164ab70ace22721 Mon Sep 17 00:00:00 2001
From: Slobodan <vidovic.slobodan89@gmail.com>
Date: Sat, 25 Apr 2026 00:44:35 +0200
Subject: [PATCH] Adjust Y coordinate flipping in w2c function

Flip the Y coordinate in the w2c function for correct rendering.
---
 extensions/Four-channel-robotic-painting.html | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/extensions/Four-channel-robotic-painting.html b/extensions/Four-channel-robotic-painting.html
index ceee2e5..d499bd7 100644
--- a/extensions/Four-channel-robotic-painting.html
+++ b/extensions/Four-channel-robotic-painting.html
@@ -1305,7 +1305,8 @@
 
 // World → canvas
 function w2c(x, y) {
-  return [x * viz.scale + viz.ox, y * viz.scale + viz.oy];
+  const flippedY = (viz.dataMaxY - y); // flip here
+  return [x * viz.scale + viz.ox, flippedY * viz.scale + viz.oy];
 }
 
 function vizDraw() {