From dabf4cbc76ff06b8fc3b37ceb4bf54cfa5a97d5a Mon Sep 17 00:00:00 2001
From: Pavel Machek <pavel@ucw.cz>
Date: Sun, 5 Nov 2023 19:01:59 +0100
Subject: [PATCH] skyspy: initial import.

Application to view sattelitte positions and whether watch can receive
data from them.
---
 apps/skyspy/ChangeLog     |   1 +
 apps/skyspy/README.md     |   4 +
 apps/skyspy/app-icon.js   |   2 +
 apps/skyspy/app.png       | Bin 0 -> 14889 bytes
 apps/skyspy/metadata.json |  13 ++
 apps/skyspy/skyspy.app.js | 261 ++++++++++++++++++++++++++++++++++++++
 6 files changed, 281 insertions(+)
 create mode 100644 apps/skyspy/ChangeLog
 create mode 100644 apps/skyspy/README.md
 create mode 100644 apps/skyspy/app-icon.js
 create mode 100644 apps/skyspy/app.png
 create mode 100644 apps/skyspy/metadata.json
 create mode 100644 apps/skyspy/skyspy.app.js

diff --git a/apps/skyspy/ChangeLog b/apps/skyspy/ChangeLog
new file mode 100644
index 000000000..263d4078d
--- /dev/null
+++ b/apps/skyspy/ChangeLog
@@ -0,0 +1 @@
+0.01: attempt to import
diff --git a/apps/skyspy/README.md b/apps/skyspy/README.md
new file mode 100644
index 000000000..3601ec577
--- /dev/null
+++ b/apps/skyspy/README.md
@@ -0,0 +1,4 @@
+# Sky Spy
+
+Application to view sattelitte positions and whether watch can receive
+data from them.
diff --git a/apps/skyspy/app-icon.js b/apps/skyspy/app-icon.js
new file mode 100644
index 000000000..903d14af5
--- /dev/null
+++ b/apps/skyspy/app-icon.js
@@ -0,0 +1,2 @@
+require("heatshrink").decompress(atob("mEwgIQNgQFEj/gAof+jgECgeAAIIFBgwCBuACBhgCEjAOEAoQ6CmAhCDwItDoEB4AFCsEBFgUEkEDG4XEJYcL8gFCgUP+gxCAoP8DIIFBhfsiEIAoMJAogCBAoYlBiBMBAoUwrA0B////ALECI0QAocgAolgApVADolAHYnAAomAAoqdBAoKVBMoRvCOIQDCRIIFBYwKVBAoKqC4AFBVQVggTRDn0CYgQcBN4LpDV4T7IAooAJA="))
+
diff --git a/apps/skyspy/app.png b/apps/skyspy/app.png
new file mode 100644
index 0000000000000000000000000000000000000000..ce7ac239fd0f72f3a1ab88ccfa91bcd21846caf4
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diff --git a/apps/skyspy/metadata.json b/apps/skyspy/metadata.json
new file mode 100644
index 000000000..7294c2637
--- /dev/null
+++ b/apps/skyspy/metadata.json
@@ -0,0 +1,13 @@
+{ "id": "skyspy",
+  "name": "Sky Spy",
+  "version":"0.01",
+  "description": "Application for debugging GPS problems",
+  "icon": "app.png",
+  "readme": "README.md",
+  "supports" : ["BANGLEJS2"],
+  "tags": "tool",
+  "storage": [
+      {"name":"skyspy.app.js","url":"skyspy.app.js"},
+      {"name":"skyspy.img","url":"app-icon.js","evaluate":true}
+  ]
+}
diff --git a/apps/skyspy/skyspy.app.js b/apps/skyspy/skyspy.app.js
new file mode 100644
index 000000000..b90a56a75
--- /dev/null
+++ b/apps/skyspy/skyspy.app.js
@@ -0,0 +1,261 @@
+/* Sky spy */
+/* 0 .. DD.ddddd
+   1 .. DD MM.mmm'
+   2 .. DD MM'ss"
+*/
+var mode = 1;
+var display = 0;
+
+var debug = 0;
+
+var cancel_gps, gps_start;
+var cur_altitude;
+
+var wi = 24;
+var h = 176-wi, w = 176;
+
+var fix;
+
+function radA(p) { return p*(Math.PI*2); }
+function radD(d) { return d*(h/2); }
+function radX(p, d) {
+  let a = radA(p);
+  return w/2 + Math.sin(a)*radD(d);
+}
+function radY(p, d) {
+  let a = radA(p);
+  return h/2 - Math.cos(a)*radD(d) + wi;
+}
+
+function format(x) {
+  switch (mode) {
+    case 0:
+      return "" + x;
+    case 1:
+      d = Math.floor(x);
+      m = x - d;
+      m = m*60;
+      return "" + d + " " + m.toFixed(3) + "'";
+    case 2:
+      d = Math.floor(x);
+      m = x - d;
+      m = m*60;
+      mf = Math.floor(m);
+      s = m - mf;
+      s = s*60;
+      return "" + d + " " + mf + "'" + s.toFixed(0) + '"';
+  }
+}
+var qalt = -1;
+function resetAlt() {
+  min_dalt = 9999; max_dalt = -9999; step = 0;
+}
+resetAlt();
+
+function calcAlt(alt, cur_altitude) {
+    let dalt = alt - cur_altitude;
+
+    if (min_dalt > dalt)
+      min_dalt = dalt;
+    if (max_dalt < dalt)
+      max_dalt = dalt;
+
+    let ddalt = max_dalt - min_dalt;
+    return ddalt;
+}
+function updateGps() {
+  let have = false, lat = "lat", lon = "lon", alt = "alt",
+      speed = "speed", hdop = "hdop", balt = "balt";
+
+  if (cancel_gps)
+    return;
+  fix = Bangle.getGPSFix();
+
+  try {
+    Bangle.getPressure().then((x) => {
+      cur_altitude = x.altitude;
+    }, print);
+  } catch (e) {
+    print("Altimeter error", e);
+  }
+
+  speed = getTime() - gps_start;
+
+  if (fix && fix.fix && fix.lat) {
+    lat = "" + format(fix.lat);
+    lon = "" + format(fix.lon);
+    alt = "" + fix.alt.toFixed(1);
+    speed = "" + fix.speed.toFixed(1);
+    hdop = "" + fix.hdop.toFixed(1);
+    have = true;
+  }
+
+  let ddalt = calcAlt(alt, cur_altitude);
+  if (display == 1)
+    g.reset().setFont("Vector", 20)
+    .setColor(1,1,1)
+    .fillRect(0, wi, 176, 176)
+    .setColor(0,0,0)
+    .drawString("Acquiring GPS", 0, 30)
+    .drawString(lat, 0, 50)
+    .drawString(lon, 0, 70)
+    .drawString("alt "+alt, 0, 90)
+    .drawString("speed "+speed, 0, 110)
+    .drawString("hdop "+hdop, 0, 130)
+    .drawString("balt" + cur_altitude, 0, 150);
+
+  if (display == 2) {
+    g.reset().setFont("Vector", 20)
+    .setColor(1,1,1)
+    .fillRect(0, wi, 176, 176)
+    .setColor(0,0,0)
+    .drawString("GPS status", 0, 30)
+    .drawString("speed "+speed, 0, 50)
+    .drawString("hdop "+hdop, 0, 70)
+    .drawString("dd "+qalt.toFixed(0) + " (" + ddalt.toFixed(0) + ")", 0, 90)
+    .drawString("alt "+alt, 0, 110)
+    .drawString("balt " + cur_altitude, 0, 130)
+    .drawString(step, 0, 150);
+    step++;
+    if (step == 10) {
+      qalt = max_dalt - min_dalt;
+      resetAlt();
+    }
+  }
+
+  if (debug > 0)
+    print(fix);
+  setTimeout(updateGps, 1000);
+}
+
+function radLine(a1, d1, a2, d2) {
+  g.drawLine(radX(a1, d1), radY(a1, d1), radX(a2, d2), radY(a2, d2));
+}
+function radCircle(d) {
+  let step = 0.05;
+  for (let i=0; i<1; i+=0.05) {
+    radLine(i-step, d, i, d);
+  }
+  //g.flip();
+}
+function drawGrid() {
+  g.setColor(0,0,0);
+  radLine(0, 1, 0.5, 1);
+  radLine(0.25, 1, 0.75, 1);
+  radCircle(0.5);
+  radCircle(1.0);
+}
+function drawSat(s) {
+  let a = s.azi / 360;
+  let e = ((90 - s.ele) / 90);
+  let x = radX(a, e);
+  let y = radY(a, e);
+
+  if (s.snr == "")
+    g.setColor(1, 0.25, 0.25);
+  else {
+    let snr = 1*s.snr;
+    g.setColor(0, 0, 0);
+    sats_receiving ++;
+  }
+  g.drawString(s.id, x, y);
+
+}
+
+// Should correspond to view from below.
+// https://in-the-sky.org//satmap_radar.php?year=2023&month=10&day=24&skin=1
+function drawSats(sats) {
+  sats_receiving = 0;
+  g.reset().setFont("Vector", 20)
+    .setColor(1,1,1)
+    .fillRect(0, 30, 176, 176);
+
+  drawGrid();
+  for (var s of sats) {
+    if (debug > 1)
+      print(s.ele, s.azi, s.snr);
+    drawSat(s);
+  }
+  if (fix && fix.fix && fix.lat) {
+    g.setColor(0, 0, 0);
+    g.drawString(fix.satellites + "/" + fix.hdop, 10, 150);
+  }
+}
+
+var sats = [];
+var snum = 0;
+var sats_receiving = 0;
+
+function parseRaw(msg, lost) {
+  if (lost)
+    print("## data lost");
+  let s = msg.split(",");
+  if (s[0] != "$GPGSV")
+    return;
+  //print("Message", s[2], s[1]);
+  if (debug > 0)
+    print(msg);
+
+  if (s[2] == "1") {
+    snum = 0;
+    sats = [];
+  }
+
+  let view = 1 * s[3];
+
+  // s[3] -- sats in view.
+  // id, ele, azi, snr
+  if (debug > 0)
+    print("in view:", view);
+  let i = 4;
+  let k = 4;
+  if (view - snum < k)
+    k = view - snum;
+  for (let j=0; j<k; j++) {
+    let sat = {};
+    sat.id = s[i++];
+    sat.ele = 1*s[i++];
+    sat.azi = 1*s[i++];
+    sat.snr = s[i++];
+    if (debug > 0)
+      print("  ", sat);
+    sats[snum++] = sat;
+  }
+  if (debug > 1)
+    print("Checksum:", s[i]);
+  if (s[1] == s[2]) {
+    print("Complete...");
+    //print(sats);
+    if (display == 0)
+      drawSats(sats);
+  }
+}
+
+function stopGps() {
+  cancel_gps=true;
+  Bangle.setGPSPower(0, "skyspy");
+}
+
+function markGps() {
+  cancel_gps = false;
+  Bangle.setGPSPower(1, "skyspy");
+  Bangle.on('GPS-raw', parseRaw);
+  gps_start = getTime();
+  updateGps();
+}
+
+function onSwipe(dir) {
+  display = display + 1;
+  if (display == 3)
+    display = 0;
+}
+
+Bangle.setUI({
+  mode : "custom",
+  back : function() {}, // optional - add a 'back' icon in top-left widget area and call this function when it is pressed , also call it when the hardware button is clicked (does not override btn if defined)
+  swipe : onSwipe, // optional - (mode:custom only) handler for 'swipe' events
+  clock : 0 // optional - if set the behavior of 'clock' mode is added (does not override btn if defined)
+});
+Bangle.loadWidgets();
+Bangle.drawWidgets();
+markGps();