diff --git a/src/system_param/pointer.rs b/src/system_param/pointer.rs
index e66d5f8..ef0e4de 100644
--- a/src/system_param/pointer.rs
+++ b/src/system_param/pointer.rs
@@ -120,7 +120,7 @@ fn pointer_to_webview_uv(
         // outside plane bounds
         return None;
     }
-    let px = u * tex_size.x;
+    let px = (1.0 - u) * tex_size.x;
     let py = (1.0 - v) * tex_size.y;
     Some(Vec2::new(px, py))
 }