From ef1f4e406465c127910d18037152aad5dcab102b Mon Sep 17 00:00:00 2001
From: Gordon Williams <gw@pur3.co.uk>
Date: Thu, 11 May 2023 10:28:33 +0100
Subject: [PATCH] add magnetometer clock info

---
 apps/clkinfomag/ChangeLog     |   1 +
 apps/clkinfomag/clkinfo.js    |  48 ++++++++++++++++++++++++++++++++++
 apps/clkinfomag/icon.png      | Bin 0 -> 1769 bytes
 apps/clkinfomag/metadata.json |  12 +++++++++
 4 files changed, 61 insertions(+)
 create mode 100644 apps/clkinfomag/ChangeLog
 create mode 100644 apps/clkinfomag/clkinfo.js
 create mode 100644 apps/clkinfomag/icon.png
 create mode 100644 apps/clkinfomag/metadata.json

diff --git a/apps/clkinfomag/ChangeLog b/apps/clkinfomag/ChangeLog
new file mode 100644
index 000000000..4c21f3ace
--- /dev/null
+++ b/apps/clkinfomag/ChangeLog
@@ -0,0 +1 @@
+0.01: New Widget!
diff --git a/apps/clkinfomag/clkinfo.js b/apps/clkinfomag/clkinfo.js
new file mode 100644
index 000000000..7a6062a2f
--- /dev/null
+++ b/apps/clkinfomag/clkinfo.js
@@ -0,0 +1,48 @@
+(function() {
+  var heading, cnt;
+  function magHandler(m) {
+    var h = m.heading;
+    if (isNaN(heading) || isNaN(h))
+      heading = h;
+    else {
+      // Average
+      if (Math.abs(heading-h)>180) {
+        if (h<180 && heading>180) h+=360;
+        if (h>180 && heading<180) h-=360;
+      }
+      heading = heading*0.8 + h*0.2;
+      if (heading<0) heading+=360;
+      if (heading>=360) heading-=360;
+    }
+    // only draw 1 in 2 to try and save some power!
+    if (!(1&cnt++)) ci.items[0].emit('redraw');
+  }
+  var ci = {
+    name: "Bangle",
+    items: [
+      { name : "Compass",
+        get : function() {
+          var g = Graphics.createArrayBuffer(24,24,1,{msb:true});
+          if (isNaN(heading))
+            g.drawLine(8,12,16,12);
+          else
+            g.fillPoly(g.transformVertices([0,-10,4,10,-4,10],{x:12,y:12,rotate:-heading/57}));
+          return { text : isNaN(heading)?"--":Math.round(heading),
+                      v : 0|heading, min : 0, max : 360,
+                      img : g.asImage("string") }},
+        show : function() {
+          Bangle.setCompassPower(1,"clkinfomag");
+          Bangle.on('mag',magHandler);
+          cnt=0;
+          heading = undefined;
+        },
+        hide : function() {
+          Bangle.removeListener('mag', magHandler);
+          Bangle.setCompassPower(0,"clkinfomag");
+        },
+        run : function() { Bangle.resetCompass(); }
+      }
+    ]
+  };
+  return ci;
+}) // must not have a semi-colon!
\ No newline at end of file
diff --git a/apps/clkinfomag/icon.png b/apps/clkinfomag/icon.png
new file mode 100644
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diff --git a/apps/clkinfomag/metadata.json b/apps/clkinfomag/metadata.json
new file mode 100644
index 000000000..84d6bc16c
--- /dev/null
+++ b/apps/clkinfomag/metadata.json
@@ -0,0 +1,12 @@
+{ "id": "clkinfomag",
+  "name": "Compass Clockinfo",
+  "version":"0.01",
+  "description": "Extra information to add to clock screens. When selected, displays the compass heading and an arrow pointing North",
+  "icon": "icon.png",
+  "type": "clkinfo",
+  "tags": "clkinfo,compass,mag,magnetometer",
+  "supports" : ["BANGLEJS2"],
+  "storage": [
+    {"name":"clkinfomag.clkinfo.js","url":"clkinfo.js"}
+  ]
+}