From ed3ebf97543d324df6fb16b4808565a641b0e31c Mon Sep 17 00:00:00 2001
From: Erik Andresen <erik@vontaene.de>
Date: Wed, 22 Feb 2023 19:33:24 +0100
Subject: [PATCH] gpsmagcourse: Avoid jitter, fix widget

---
 apps/gpsmagcourse/README.md | 2 +-
 apps/gpsmagcourse/boot.js   | 4 +++-
 apps/gpsmagcourse/widget.js | 2 +-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/apps/gpsmagcourse/README.md b/apps/gpsmagcourse/README.md
index bca039424..f6e60ea61 100644
--- a/apps/gpsmagcourse/README.md
+++ b/apps/gpsmagcourse/README.md
@@ -25,7 +25,7 @@ On Bangle.js 2 a click on the widget does reset the built-in compass.
 
 ## Settings
 * **Speed threshold**
-  - (default = 6 km/h) When GPS speed is lower then this threshold use the compass direction.
+  - (default = 6 km/h) When GPS speed is lower then this threshold use the compass direction. The speed must be for at least 10 seconds this fast to switch back to GPS course.
 * **Compass source**
   - off: Disables this addon.
   - built-in (default): Uses the built-in compass. Its calibration can be restarted by pressing the Widget. When tilt compensation is disabled or "Navigation compass" is not installed the watch must be orientated horizontally for the compass heading to be used.
diff --git a/apps/gpsmagcourse/boot.js b/apps/gpsmagcourse/boot.js
index 189dd9e35..ffa9512fa 100644
--- a/apps/gpsmagcourse/boot.js
+++ b/apps/gpsmagcourse/boot.js
@@ -6,6 +6,7 @@
     tiltCompensation: true, // tilt compensation on built-in compass
   }, require("Storage").readJSON("gpsmagcourse.json", true) || {});
   const CALIBDATA = (settings.compassSrc === 2) ? require("Storage").readJSON("magnav.json",1) : undefined;
+  let cntAboveSpeed = 0;
 
   // Check if magnav is installed
   try {
@@ -63,7 +64,8 @@
     };
 
     const changeGpsCourse = (gps) => {
-      if (gps.speed < settings.speed) {
+      cntAboveSpeed = gps.speed < settings.speed ? 0 : cntAboveSpeed+1;
+      if (cntAboveSpeed < 10) { // need to stay x events above or equal threshold
         if (settings.compassSrc === 1 && (settings.tiltCompensation || isFaceUp(Bangle.getAccel()))) { // Use uncompensated built-in compass heading only if face is up
           const heading = Bangle.getCompass().heading;
           if (!isNaN(heading)) {
diff --git a/apps/gpsmagcourse/widget.js b/apps/gpsmagcourse/widget.js
index 0e00a1a70..6317cedcd 100644
--- a/apps/gpsmagcourse/widget.js
+++ b/apps/gpsmagcourse/widget.js
@@ -49,7 +49,7 @@
       if (gps.courseOrig && WIDGETS.gpsmagcourse.show !== 1 && Bangle.isGPSOn()) {
         WIDGETS.gpsmagcourse.show = 1;
         WIDGETS.gpsmagcourse.draw();
-      } else if (WIDGETS.gpsmagcourse.show) {
+      } else if (!gps.courseOrig && WIDGETS.gpsmagcourse.show === 1) {
         WIDGETS.gpsmagcourse.show = settings.showWidget === 1 ? 0 : 2;
         WIDGETS.gpsmagcourse.draw();
       }