diff --git a/README.md b/README.md
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new mode 100755
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--- a/README.md
+++ b/README.md
@@ -1,2 +1,34 @@
-# navpoint
+# Navpoint Desktop
+This is a simple Python program that will run two HTTP servers. One listens on
+the computer's local IP address (e.g. `192.168.x.x`), port 8888, to receive
+location updates from the [Navpoint
+Mobile](https://gallery.appinventor.mit.edu/?galleryid=2c18ee4d-4eed-452a-9228-de8e813820d1)
+Android app. The other listens on `127.0.0.1` (i.e. `localhost`), also on port
+8888, for connections from a digital globe program such as [Google Earth
+Pro](https://www.google.com/earth/about), allowing that program to track the
+user's location. (Navpoint is not developed or endorsed by Google.)
+
+Navpoint Desktop has a minimal GUI consisting only of a QR code. Simply scan
+the code in Navpoint Mobile to establish a connection. The phone and computer
+must be on the same Wi-Fi network; if a router is not available, enabling
+mobile hotspot on the phone and connecting the computer to that network should
+work well. An Internet connection is not needed; Navpoint works over a LAN.
+
+Navpoint Desktop makes the geographic data available in KML format at
+`http://127.0.0.1:8888/navpoint.kml`. The `navpoint_link.kml` file in this
+repository contains a link to this URL configured to update every three
+seconds; simply open this file in Google Earth or another compatible program to
+connect to Navpoint Desktop.
+
+## Licensing
+
+Navpoint Desktop is released under the [GNU General Public License
+v3.0](https://www.gnu.org/licenses/gpl-3.0.en.html), except the file
+`navpoint/get_ip.py`, which is released under [Creative Commons
+Attribution-ShareAlike 4.0
+International](https://creativecommons.org/licenses/by-sa/4.0/) due to use of
+[code published on Stack Overflow](https://stackoverflow.com/a/28950776).
+
+Navpoint Mobile is released under the [GNU General Public License
+v3.0](https://www.gnu.org/licenses/gpl-3.0.en.html).
diff --git a/build-linux.sh b/build-linux.sh
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--- /dev/null
+++ b/build-linux.sh
@@ -0,0 +1,40 @@
+#!/bin/sh
+
+arch=$(uname -p)
+distDir=dist/navpoint-linux-$arch
+
+rm -rf $distDir
+mkdir $distDir
+
+pyinstaller -w -F --hidden-import tornado.web main.py
+
+mv dist/main $distDir/navpoint
+cp icon.png $distDir/navpoint.png
+
+cat > $distDir/navpoint.desktop << HERE
+[Desktop Entry]
+Type=Application
+Terminal=false
+Name=Navpoint
+Exec=/bin/sh -c "$HOME/.local/bin/navpoint"
+Icon=navpoint
+StartupWMClass=navpoint
+HERE
+
+cat > $distDir/install.sh << HERE
+#!/bin/sh
+
+binary_target=~/.local/bin/
+desktop_target=~/.local/share/applications/
+icon_target=~/.local/share/icons/
+
+cp navpoint \$binary_target/navpoint
+chmod +x \$binary_target/navpoint
+
+cp navpoint.desktop \$desktop_target/navpoint.desktop
+
+cp navpoint.png \$icon_target/navpoint.png
+HERE
+chmod +x $distDir/install.sh
+
+tar -czf $distDir.tar.gz $distDir
diff --git a/build-windows.bat b/build-windows.bat
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--- /dev/null
+++ b/build-windows.bat
@@ -0,0 +1,2 @@
+pyinstaller -w -F --hidden-import tornado.web main.py
+move dist/main.exe dist/navpoint-windows.exe
diff --git a/icon.ico b/icon.ico
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Binary files /dev/null and b/icon.ico differ
diff --git a/icon.png b/icon.png
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Binary files /dev/null and b/icon.png differ
diff --git a/icon.svg b/icon.svg
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+++ b/icon.svg
@@ -0,0 +1,6 @@
+
+
diff --git a/main.py b/main.py
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+++ b/main.py
@@ -0,0 +1,3 @@
+import navpoint.run
+
+navpoint.run.run()
diff --git a/navpoint/__init__.py b/navpoint/__init__.py
new file mode 100755
index 0000000..e69de29
diff --git a/navpoint/__main__.py b/navpoint/__main__.py
new file mode 100755
index 0000000..1919d35
--- /dev/null
+++ b/navpoint/__main__.py
@@ -0,0 +1,3 @@
+import navpoint.run
+
+navpoint.run.run()
diff --git a/navpoint/content.py b/navpoint/content.py
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--- /dev/null
+++ b/navpoint/content.py
@@ -0,0 +1 @@
+content = """Navpoint (waiting for phone)Navpoint Desktop waiting for connection from phone1"""
diff --git a/navpoint/get_ip.py b/navpoint/get_ip.py
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+++ b/navpoint/get_ip.py
@@ -0,0 +1,22 @@
+# Copyright 2015-2021 Stack Overflow user "fatal_error"
+# Copyright 2020 Stack Overflow user "user2561747"
+#
+# https://stackoverflow.com/a/28950776
+#
+# Used under CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/
+
+import socket
+
+
+def get_ip():
+ s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+ s.settimeout(0)
+ try:
+ # doesn't even have to be reachable
+ s.connect(("10.254.254.254", 1))
+ IP = s.getsockname()[0]
+ except Exception:
+ IP = "127.0.0.1"
+ finally:
+ s.close()
+ return IP
diff --git a/navpoint/gui.py b/navpoint/gui.py
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+++ b/navpoint/gui.py
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+import tkinter as tk
+import pyqrcode
+
+
+def run(link):
+ window = tk.Tk(className="navpoint")
+ window.title("Navpoint")
+ window.resizable(width=False, height=False)
+
+ label = tk.Label(window, text="QR code here...")
+ label.pack()
+
+ image = tk.BitmapImage(
+ data=pyqrcode.create(link).xbm(scale=int(window.winfo_fpixels("2m")))
+ )
+ image.config(background="white")
+ image.config(foreground="black")
+
+ label.config(image=image)
+
+ try:
+ window.iconbitmap("icon.ico")
+ except tk.TclError:
+ pass
+
+
+ window.mainloop()
diff --git a/navpoint/local_server.py b/navpoint/local_server.py
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+++ b/navpoint/local_server.py
@@ -0,0 +1,23 @@
+import threading
+import asyncio
+import tornado
+import navpoint.content
+
+
+class GetHandler(tornado.web.RequestHandler):
+ def get(self):
+ self.write(navpoint.content.content)
+
+
+async def main():
+ app = tornado.web.Application(
+ [
+ (r"/navpoint.kml", GetHandler),
+ ]
+ )
+ app.listen(8888, address="127.0.0.1")
+ await asyncio.Event().wait()
+
+
+def run():
+ threading.Thread(target=asyncio.run, args=(main(),), daemon=True).start()
diff --git a/navpoint/phone_server.py b/navpoint/phone_server.py
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+++ b/navpoint/phone_server.py
@@ -0,0 +1,46 @@
+import tornado
+import navpoint.get_ip
+import navpoint.content
+import asyncio
+import secrets
+import threading
+
+
+class PostHandler(tornado.web.RequestHandler):
+ def get(self):
+ self.write(
+ "Navpoint
Navpoint
The Navpoint desktop app is working, but you need to scan the QR code from the Navpoint mobile app, not open it in your browser.