Initial commit: Paperwall, a standalone e-ink dashboard

Navidrome now-playing, clock, and weather for a Waveshare epd4in0e panel,
with a local web UI and install/uninstall scripts for the Pi.

screens/weather.py

@@ -0,0 +1,108 @@
+"""Current weather via Open-Meteo (free, no API key -- just a lat/long)."""
+
+import logging
+
+import requests
+from PIL import Image, ImageDraw
+
+from screens.base import Screen
+from screens.render_utils import load_font, text_width
+
+logger = logging.getLogger(__name__)
+
+HTTP_TIMEOUT = 10
+
+# WMO weather codes -> (German description, symbol). Not exhaustive, covers
+# the common cases; unmapped codes fall back to a generic description.
+WMO_CODES = {
+    0: ("Klarer Himmel", "☀"),
+    1: ("Überwiegend klar", "☀"),
+    2: ("Teilweise bewölkt", "⛅"),
+    3: ("Bedeckt", "☁"),
+    45: ("Nebel", "☁"),
+    48: ("Nebel", "☁"),
+    51: ("Leichter Nieselregen", "☂"),
+    53: ("Nieselregen", "☂"),
+    55: ("Starker Nieselregen", "☂"),
+    61: ("Leichter Regen", "☔"),
+    63: ("Regen", "☔"),
+    65: ("Starker Regen", "☔"),
+    71: ("Leichter Schneefall", "❄"),
+    73: ("Schneefall", "❄"),
+    75: ("Starker Schneefall", "❄"),
+    80: ("Regenschauer", "☔"),
+    81: ("Regenschauer", "☔"),
+    82: ("Heftige Regenschauer", "☔"),
+    85: ("Schneeschauer", "❄"),
+    86: ("Schneeschauer", "❄"),
+    95: ("Gewitter", "⚡"),
+    96: ("Gewitter mit Hagel", "⚡"),
+    99: ("Gewitter mit Hagel", "⚡"),
+}
+
+
+class WeatherScreen(Screen):
+    id = "weather"
+    display_name = "Weather"
+    poll_interval = 1800  # 30 minutes -- weather doesn't need to be fresher
+
+    def default_settings(self) -> dict:
+        return {"latitude": None, "longitude": None}
+
+    def check(self, settings: dict):
+        lat = settings.get("latitude")
+        lon = settings.get("longitude")
+        if lat is None or lon is None:
+            logger.warning("Weather screen has no latitude/longitude configured")
+            return None
+
+        response = requests.get(
+            "https://api.open-meteo.com/v1/forecast",
+            params={"latitude": lat, "longitude": lon, "current_weather": "true"},
+            timeout=HTTP_TIMEOUT,
+        )
+        response.raise_for_status()
+        current = response.json().get("current_weather") or {}
+        if "temperature" not in current:
+            return None
+
+        code = int(current.get("weathercode", -1))
+        description, symbol = WMO_CODES.get(code, ("Unbekannt", "?"))
+        return {
+            "temperature": current["temperature"],
+            "windspeed": current.get("windspeed"),
+            "description": description,
+            "symbol": symbol,
+        }
+
+    def render(self, state, settings: dict, resolution: tuple[int, int]) -> Image.Image:
+        width, height = resolution
+        image = Image.new("RGB", (width, height), "white")
+        draw = ImageDraw.Draw(image)
+
+        if not state:
+            font = load_font(size=int(min(width, height) * 0.06))
+            msg = "Kein Standort konfiguriert" if not (
+                settings.get("latitude") and settings.get("longitude")
+            ) else "Wetterdaten nicht verfügbar"
+            mw = text_width(draw, msg, font)
+            draw.text(((width - mw) / 2, height / 2), msg, font=font, fill=(120, 120, 120))
+            return image
+
+        symbol_font = load_font(size=int(min(width, height) * 0.28))
+        temp_font = load_font(size=int(min(width, height) * 0.22), bold=True)
+        desc_font = load_font(size=int(min(width, height) * 0.055))
+
+        symbol = state["symbol"]
+        sw = text_width(draw, symbol, symbol_font)
+        draw.text(((width - sw) / 2, height * 0.14), symbol, font=symbol_font, fill="black")
+
+        temp_str = f"{round(state['temperature'])}°"
+        tw = text_width(draw, temp_str, temp_font)
+        draw.text(((width - tw) / 2, height * 0.46), temp_str, font=temp_font, fill="black")
+
+        desc = state["description"]
+        dw = text_width(draw, desc, desc_font)
+        draw.text(((width - dw) / 2, height * 0.68), desc, font=desc_font, fill=(90, 90, 90))
+
+        return image