Added my "Where in the world?" application

apps.json

@@ -3132,5 +3132,18 @@
     {"name":"hourstrike.boot.js","url":"boot.js"},
     {"name":"hourstrike.img","url":"app-icon.js","evaluate":true}
   ]
+},
+{ "id": "whereworld",
+  "name": "Where in the World?",
+  "shortName" : "Where World",
+  "icon": "app.png",
+  "version": "0.01",
+  "description": "Shows your current location on the world map",
+  "tags": "gps",
+  "storage": [
+    {"name":"whereworld.app.js","url":"app.js"},
+    {"name":"whereworld.img","url":"app-icon.js","evaluate":true},
+    {"name":"whereworld.worldmap","url":"worldmap"}
+  ]
 }
 ]

apps/whereworld/ChangeLog

@@ -0,0 +1 @@
+0.01: Created app

apps/whereworld/app-icon.js

@@ -0,0 +1 @@
+require("heatshrink").decompress(atob("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"))

apps/whereworld/app.js

@@ -0,0 +1,69 @@
+const landColor = 0x8FAB, seaColor= 0x365D, markerColor = 0xF800;
+let lastSuccess = true;
+
+const mapImg = {
+    width : 240,
+    height : 240,
+    palette: new Uint16Array([landColor, seaColor]),
+    buffer: require("Storage").read("whereworld.worldmap")
+};
+
+function getMarkerImg(x, y) {
+    const b = Graphics.createArrayBuffer(240, 240, 2, {msb:true});
+    b.setColor(1);
+    b.drawLine(x, 0, x, b.getHeight());
+    b.drawLine(0, y, b.getWidth(), y);
+    const pal = new Uint16Array([0, markerColor]);
+    return {width: 240, height: 240, bpp: 2, palette: pal, buffer: b.buffer, transparent: 0};
+}
+
+function degreesToRadians(deg) {
+    return (deg / 180) * Math.PI;
+}
+
+function coordsToScreenLocation(lat, lon) {
+    const maxMapHeight = g.getHeight() - 1, maxMapWidth = g.getWidth() - 1;
+    const maxLong = 180;
+    const x = ((lon + maxLong) / (maxLong * 2)) * maxMapWidth;
+    const mercN = Math.log(Math.tan((Math.PI / 4) + (degreesToRadians(lat) / 2)));
+    const y = (maxMapHeight / 2) - (maxMapWidth * mercN / (2 * Math.PI));
+    return {x: x, y: y};
+}
+
+function drawLocation(lat, lon) {
+    const location = coordsToScreenLocation(lat, lon);
+    g.drawImages([
+        {image: mapImg},
+        {image: getMarkerImg(location.x, location.y)}
+    ]);
+}
+
+function drawNoFixMessage() {
+    const b = Graphics.createArrayBuffer(240, 216, 1, {msb:true});
+    const throbber = ".".repeat(new Date().getSeconds() % 4);
+    b.setColor(1);
+    b.setFont("6x8", 2);
+    b.drawString("Finding GPS Fix" + throbber, 15, 94);
+    g.drawImage({
+        width: b.getWidth(),
+        height: b.getHeight(),
+        palette: new Uint16Array([0, 0xF800]),
+        buffer: b.buffer
+    }, 0, 24);
+}
+
+Bangle.setGPSPower(1);
+Bangle.loadWidgets();
+Bangle.on('GPS', function(gps) {
+    if (gps.fix) {
+        drawLocation(gps.lat, gps.lon);
+        lastSuccess = true;
+    }
+    else {
+        if (lastSuccess) {
+            Bangle.drawWidgets();
+            lastSuccess = false;
+        }
+        drawNoFixMessage();
+    }
+});