From 56cc982cbc2902347978f324366d00da9da11475 Mon Sep 17 00:00:00 2001
From: Martin Boonk <martin@boonk.info>
Date: Sun, 6 Aug 2023 20:30:53 +0200
Subject: [PATCH] gpstrek - Draw direction arrows on route

---
 apps/gpstrek/app.js       | 35 +++++++++++++++++++++++++++--------
 apps/gpstrek/default.json |  1 +
 apps/gpstrek/settings.js  |  6 ++++++
 3 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/apps/gpstrek/app.js b/apps/gpstrek/app.js
index 21259c522..eb21498c0 100644
--- a/apps/gpstrek/app.js
+++ b/apps/gpstrek/app.js
@@ -170,11 +170,6 @@ let getDoubleLineSlice = function(title1,title2,provider1,provider2){
   };
 };
 
-const dot = Graphics.createImage(`
-XX
-XX
-`);
-
 const arrow = Graphics.createImage(`
      X
     XXX
@@ -184,6 +179,14 @@ const arrow = Graphics.createImage(`
 XXX     XXX
 `);
 
+const thinarrow = Graphics.createImage(`
+    X
+   XXX
+  XX XX
+ XX   XX
+XX     XX
+`);
+
 const cross = Graphics.createImage(`
 XX       XX
  XX     XX
@@ -458,7 +461,8 @@ let getMapSlice = function(){
             i:startingIndex,
             poly:[],
             maxWaypoints: maxWaypoints,
-            breakLoop: false
+            breakLoop: false,
+            dist: 0
           };
 
           let drawChunk = function(data){
@@ -469,6 +473,7 @@ let getMapSlice = function(){
             let last;
             let toDraw;
             let named = [];
+            let dir = [];
             for (let j = 0; j < SETTINGS.mapChunkSize; j++){
               data.i = data.i + (reverse?-1:1);
               let p = get(route, data.i);
@@ -483,7 +488,17 @@ let getMapSlice = function(){
                 break;
               }
               toDraw = Bangle.project(p);
-              if (p.name) named.push({i:data.poly.length,n:p.name});
+
+              if (SETTINGS.mapDirection){
+                let lastWp = get(route, data.i - (reverse?-1:1));
+                if (lastWp) data.dist+=distance(lastWp,p);
+                if (!isMapOverview && data.dist > 20/mapScale){
+                  dir.push({i:data.poly.length,b:require("graphics_utils").degreesToRadians(bearing(lastWp,p)-(reverse?0:180))});
+                  data.dist=0;
+                }
+              }
+              if (p.name)
+                named.push({i:data.poly.length,n:p.name});
               data.poly.push(startingPoint.x-toDraw.x);
               data.poly.push((startingPoint.y-toDraw.y)*-1);
             }
@@ -504,7 +519,11 @@ let getMapSlice = function(){
               }
               graphics.drawString(c.n, data.poly[c.i] + 10, data.poly[c.i+1]);
             }
-            
+
+            for (let c of dir){
+              graphics.drawImage(thinarrow, data.poly[c.i], data.poly[c.i+1], {rotate: c.b});
+            }
+
             if (finish)
               graphics.drawImage(finishIcon, data.poly[data.poly.length - 2] -5, data.poly[data.poly.length - 1] - 4);
             else if (last) {
diff --git a/apps/gpstrek/default.json b/apps/gpstrek/default.json
index 985efc94e..aa8d5ecb1 100644
--- a/apps/gpstrek/default.json
+++ b/apps/gpstrek/default.json
@@ -3,6 +3,7 @@
   "mapScale":0.5,
   "mapRefresh":1000,
   "mapChunkSize": 15,
+  "mapDirection": true,
   "overviewScroll": 30,
   "overviewScale": 0.02,
   "refresh":500,
diff --git a/apps/gpstrek/settings.js b/apps/gpstrek/settings.js
index ebd9c13bb..1510bcba4 100644
--- a/apps/gpstrek/settings.js
+++ b/apps/gpstrek/settings.js
@@ -54,6 +54,12 @@
         onchange: v => {
           writeSettings("overviewScale",v);
         }
+      },
+      'Show direction': {
+        value: !!settings.mapDirection,
+        onchange: v => {
+          writeSettings("mapDirection",v);
+        }
       }
     };
     E.showMenu(menu);