From 10ae237b73fd64e7cf936bbcf1a1516b3bf288e4 Mon Sep 17 00:00:00 2001
From: Jon Beniston <jon@beniston.com>
Date: Thu, 16 Feb 2023 14:42:29 +0000
Subject: [PATCH] Add image zoom level for 2D image, although it isn't quite
 correct.

---
 plugins/channelrx/demodapt/aptdemodimageworker.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/plugins/channelrx/demodapt/aptdemodimageworker.cpp b/plugins/channelrx/demodapt/aptdemodimageworker.cpp
index d33c11127..1b22c662d 100644
--- a/plugins/channelrx/demodapt/aptdemodimageworker.cpp
+++ b/plugins/channelrx/demodapt/aptdemodimageworker.cpp
@@ -706,6 +706,13 @@ void APTDemodImageWorker::sendImageToMap(QImage image)
             swgMapItem->setImageTileNorth(m_tileNorth);
             swgMapItem->setImageTileSouth(m_tileSouth);
 
+            // FIXME: This isn't correct. Possibly need to use different projection
+            double earthCircumference = 40075016.686;
+            double latitude = m_tileSouth + (m_tileNorth - m_tileSouth) / 2.0;
+            double scale = std::cos(Units::degreesToRadians(latitude));
+            double zoom = std::log2(earthCircumference * scale * selectedChannel.width() / 2926600) - 8;
+            swgMapItem->setImageZoomLevel(zoom);
+
             MainCore::MsgMapItem *msg = MainCore::MsgMapItem::create(m_aptDemod, swgMapItem);
             messageQueue->push(msg);
         }