From 09413bc7f345aa9fd7f3a41596163d6d9cf6ec65 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tim=20Z=C3=B6ller?= <tim.zoeller@lambdaschmiede.com>
Date: Wed, 3 Dec 2025 20:33:09 +0100
Subject: [PATCH] Moar federation

---
 .../fitpub/service/ActivityImageService.java  | 26 ++++++++++++++-----
 .../templates/activities/detail.html          |  2 +-
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/src/main/java/org/operaton/fitpub/service/ActivityImageService.java b/src/main/java/org/operaton/fitpub/service/ActivityImageService.java
index 2184ba8..6ee1d93 100644
--- a/src/main/java/org/operaton/fitpub/service/ActivityImageService.java
+++ b/src/main/java/org/operaton/fitpub/service/ActivityImageService.java
@@ -137,7 +137,8 @@ public class ActivityImageService {
         // Draw track segments with privacy fade
         g2d.setStroke(new BasicStroke(4.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
 
-        final double FADE_DISTANCE = 300.0; // 300 meters fade zone
+        final double HIDDEN_DISTANCE = 100.0; // First/last 100m completely hidden
+        final double FADE_DISTANCE = 200.0;   // Fade zone from 100m to 200m
 
         for (int i = 0; i < trackPoints.size() - 1; i++) {
             Map<String, Object> point1 = trackPoints.get(i);
@@ -161,14 +162,25 @@ public class ActivityImageService {
                 // Calculate fade opacity (0.0 to 1.0)
                 float opacity = 1.0f;
 
-                if (distanceFromStart < FADE_DISTANCE) {
-                    // Fade in from start
-                    opacity = Math.min(opacity, (float) (distanceFromStart / FADE_DISTANCE));
+                // Hide first 100m completely, fade in from 100m to 200m
+                if (distanceFromStart < HIDDEN_DISTANCE) {
+                    opacity = 0.0f;
+                } else if (distanceFromStart < FADE_DISTANCE) {
+                    // Fade in from 100m to 200m
+                    opacity = Math.min(opacity, (float) ((distanceFromStart - HIDDEN_DISTANCE) / (FADE_DISTANCE - HIDDEN_DISTANCE)));
                 }
 
-                if (distanceFromEnd < FADE_DISTANCE) {
-                    // Fade out at end
-                    opacity = Math.min(opacity, (float) (distanceFromEnd / FADE_DISTANCE));
+                // Hide last 100m completely, fade out from 200m to 100m before end
+                if (distanceFromEnd < HIDDEN_DISTANCE) {
+                    opacity = 0.0f;
+                } else if (distanceFromEnd < FADE_DISTANCE) {
+                    // Fade out from 200m to 100m before end
+                    opacity = Math.min(opacity, (float) ((distanceFromEnd - HIDDEN_DISTANCE) / (FADE_DISTANCE - HIDDEN_DISTANCE)));
+                }
+
+                // Skip completely transparent segments
+                if (opacity <= 0.0f) {
+                    continue;
                 }
 
                 // Apply opacity to track color
diff --git a/src/main/resources/templates/activities/detail.html b/src/main/resources/templates/activities/detail.html
index ad109ad..3c2205d 100644
--- a/src/main/resources/templates/activities/detail.html
+++ b/src/main/resources/templates/activities/detail.html
@@ -384,7 +384,7 @@
                     // Create map (needs to be done after container is visible)
                     setTimeout(() => {
                         const map = FitPub.createActivityMap('activityMap', geoJson, {
-                            showStartEnd: true,
+                            showStartEnd: false,  // Privacy: Do not show start/end markers
                             fitBounds: true
                         });