From 5e66d42f596fd2c02cf7ed7b74d5d57686ce2f13 Mon Sep 17 00:00:00 2001
From: Richard Grimes <34091455+TheScienceotter@users.noreply.github.com>
Date: Fri, 30 Jan 2026 11:50:17 +0100
Subject: [PATCH] Position of watermark text now calculated in polar
 coordinates

Watermark text will now appear to rotate around the page centre, rather than at the bottom corner of the text element.
---
 src/js/logic/add-watermark-page.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/js/logic/add-watermark-page.ts b/src/js/logic/add-watermark-page.ts
index 7d366c9..3f503c4 100644
--- a/src/js/logic/add-watermark-page.ts
+++ b/src/js/logic/add-watermark-page.ts
@@ -178,8 +178,8 @@ async function addWatermark() {
                 const textWidth = watermarkAsset.widthOfTextAtSize(text, fontSize);
 
                 page.drawText(text, {
-                    x: (width - textWidth) / 2,
-                    y: height / 2,
+                    x: (width / 2) - ((textWidth / 2) * Math.cos(angle * Math.PI / 180)),
+                    y: (height / 2) - ((textWidth / 2) * Math.sin(angle * Math.PI / 180)),
                     font: watermarkAsset,
                     size: fontSize,
                     color: rgb(textColor.r, textColor.g, textColor.b),