gipy : initial commit

apps/gipy/README.md

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+# Gipy
+
+Development still in progress. Follow compressed gpx traces.
+Warns you before reaching intersections and tries to turn off gps.
+
+## Usage
+
+WIP.
+
+
+## Creator
+
+frederic.wagner@imag.fr

apps/gipy/app.js

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+
+// screen size is 172x172
+// we want to show 100 meters ahead
+// 86 pixels is 100 meters
+// 10 meters is 8.6 pixels
+// 1 integer unit is 1.1 meter
+// 8.6 pixels is 10 / 1.1 integers
+// int = 8.6 pix * 1.1 / 10
+// int = 0.946 pixels
+
+var lat = null;
+var lon = null;
+
+class Path {
+  constructor(filename) {
+    let buffer = require("Storage").readArrayBuffer(filename);
+    this.points_number = (buffer.byteLength - 2*8)/4;
+    this.view = DataView(buffer);
+    this.min_lon = this.view.getFloat64(0);
+    this.min_lat = this.view.getFloat64(8);
+    this.current_start = 0; // index of first point to be displayed
+    this.current_x = 0;
+    this.current_y = 0;
+  }
+
+  get len() {
+    return this.points_number;
+  }
+}
+
+class Point {
+  constructor(lon, lat) {
+    this.lon = lon;
+    this.lat = lat;
+  }
+  screen_x() {
+    return 192/2 + Math.round((this.lon - lon) * 100000.0);
+  }
+  screen_y() {
+    return 192/2 + Math.round((this.lat - lat) * 100000.0);
+  }
+}
+
+function display(path) {
+  g.clear();
+  let previous_point = null;
+  let current_x = path.current_x;
+  let current_y = path.current_y;
+  for (let i = path.current_start ; i < path.len ; i++) {
+    current_x += path.view.getInt16(2*8+4*i);
+    current_y += path.view.getInt16(2*8+4*i+2);
+    let point = new Point(current_x/100000.0 + path.min_lon, current_y/100000.0 + path.min_lat);
+
+    if (previous_point !== null) {
+      g.drawLine(
+        previous_point.screen_x(),
+        previous_point.screen_y(),
+        point.screen_x(),
+        point.screen_y()
+      );
+    }
+    previous_point = point;
+  }
+  g.setColor(1.0, 0.0, 0.0);
+  g.fillCircle(192/2, 192/2, 5);
+}
+
+let path = new Path("test.gpc");
+lat = path.min_lat;
+lon = path.min_lon;
+
+function set_coordinates(data) {
+  if (!isNaN(data.lat)) {
+    lat = data.lat;
+  }
+  if (!isNaN(data.lon)) {
+    lon = data.lon;
+  }
+}
+
+Bangle.setGPSPower(true, "gipy");
+Bangle.on('GPS', set_coordinates);
+
+setInterval(display, 1000, path);
+

apps/gipy/metadata.json

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+{
+  "id": "gipy",
+  "name": "Gipy",
+  "shortName": "Gipy",
+  "version": "0.01",
+  "description": "Follow gpx files",
+  "allow_emulator":false,
+  "icon": "gipy.img",
+  "type": "app",
+  "tags": "tool,outdoors,gps",
+  "screenshots": [{"url":"screenshot_gipy.png"}],
+  "supports": ["BANGLEJS2"],
+  "readme": "README.md",
+  "storage": [
+    {"name":"gipy.app.js","url":"app.js"},
+    {"name":"gipy.img","url":"gipy-icon.js","evaluate":true},
+    {"name":"gipy.settings.js","url":"settings.js"}
+  ],
+  "data": [
+    {"name":"gipy.gpc"}
+  ]
+}