About

This is an educational project to refresh and learn some C skills in

SDL graphics programming
pthread handling
curl and json parsing
ini-style config reading
dlopen pluging handling

Currently it only queries the OpenWeatherMap API and displays the current weather on screen via SDL, which - with proper SDL build - also works X-less on a RasPi.

Build and Run

Obtain an API key at https://openweathermap.org/current and place it in etc/openweathermap.key

make && ./westation $(cat etc/openweathermap.key | tr -d "\n")

Random Notes

Install SDL

SDL must be installed manually on Raspi, otherwise it doesn't work without X.

Download from https://www.libsdl.org/download-2.0.php
tar zxvf SDL2-2.0.3.tar.gz
cd SDL2-2.0.3 && mkdir build && cd build
../configure --host=armv7l-raspberry-linux-gnueabihf --disable-pulseaudio --disable-esd --disable-video-mir --disable-video-wayland --disable-video-x11 --disable-video-opengl
make -j4 && make install

Download and install SDL_image and SDL_ttf (without configure flags).

Note for SDL_ttf:

fails to link in the end due to missing libGL.so, just created manual link ** cd /usr/lib/arm-linux-gnueabihf/ ** sudo ln -s libGL.so.1 libGL.so

In general, disable full OpenGL, otherwise SDL fails to initialize:

sudo raspi-config
Advanced -> GL Driver -> GL (Fake KMS)

Resources

Batch-Convert SVG to PNG on Mac with proper transparency

rsvg-convert -h 160 SVG/5.svg > PNG/5.png ** via brew install librsvg

Remove SVG elemement and convert to PNG

westation/assets/meteocons-icons/svg2png.sh

Query openweathermap API

KEY=$(cat etc/openweathermap.key | tr -d "\n");
curl "https://api.openweathermap.org/data/2.5/weather?APPID=$KEY&zip=1100,AT&units=metric&lang=de";
echo

https://openweathermap.org/weather-conditions

agranig/westation