From 33ccf56969cbb41b3fcb8c09b9fd91b51ae01850 Mon Sep 17 00:00:00 2001
From: Theis Pieter Hollebeek <tphollebeek@gmail.com>
Date: Tue, 14 Oct 2025 14:06:12 +0200
Subject: [PATCH] fix canvas mouse event ratio

---
 src/gamelib.js | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/gamelib.js b/src/gamelib.js
index 51e4960..ae76391 100644
--- a/src/gamelib.js
+++ b/src/gamelib.js
@@ -37,10 +37,18 @@ export class Gamelib {
         });
 
         canvasElement.addEventListener("mousemove", (ev) => {
-            this.mouseX = ev.offsetX;
-            this.mouseY = ev.offsetY;
+            const ratioX = canvasElement.width / canvasElement.clientWidth;
+            const ratioY = canvasElement.height / canvasElement.clientHeight;
 
-            this.mouseMoveHandler?.(ev.offsetX, ev.offsetY, ev.movementX, ev.movementY);
+            this.mouseX = ev.offsetX * ratioX;
+            this.mouseY = ev.offsetY * ratioY;
+
+            this.mouseMoveHandler?.(
+                ev.offsetX * ratioX,
+                ev.offsetY * ratioY,
+                ev.movementX * ratioX,
+                ev.movementY * ratioY,
+            );
         });
 
         canvasElement.addEventListener("mousedown", (ev) => {