From 7d3a113ba33d15ef18fc87327051f52215bfe54f Mon Sep 17 00:00:00 2001
From: Thomas Hooge <thomas@hoogi.de>
Date: Fri, 18 Jul 2025 19:46:52 +0200
Subject: [PATCH] =?UTF-8?q?Entfernungsberechnung=20f=C3=BCr=20gro=C3=9Fe?=
 =?UTF-8?q?=20und=20kleine=20Distanzen?=
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---
 pages/page.py | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/pages/page.py b/pages/page.py
index 90f3d10..25cbb1a 100644
--- a/pages/page.py
+++ b/pages/page.py
@@ -45,6 +45,25 @@ class Page():
             rotated.append((ox + fc * dx - fs * dy, oy + fs * dx + fc * dy))
         return rotated
 
+    @staticmethod
+    def rhumb(lat1, lon1, lat2, lon2):
+        # Distance in m
+        lon1, lat1, lon2, lat2 = map(radians, [lon1, lat1, lon2, lat2])
+        dlon = lon2 - lon1
+        dlat = lat2 - lat1
+        mlat = (lat1 + lat2) / 2
+        return 6371000 * sqrt(dlat**2 + (cos(mlat) * dlon)**2)
+
+    @staticmethod
+    def haversine(lat1, lon1, lat2, lon2):
+        # Great circle distance in nm
+        lon1, lat1, lon2, lat2 = map(radians, [lon1, lat1, lon2, lat2])
+        dlon = lon2 - lon1
+        dlat = lat2 - lat1
+        a = sin(dlat/2)**2 + cos(lat1) * cos(lat2) * sin(dlon/2)**2
+        c = 2 * asin(sqrt(a))
+        return c * 3440
+
     def __init__(self, pageno, cfg, boatdata):
         self.pageno = pageno
         self.cfg = cfg