feat: add weather dashboard demo application

[aiduxiaoxiong]

Weather Dashboard Demo

A feature-rich weather dashboard application built with LVGL for the openvela platform.

Features

• Multi-page navigation with animated page transitions (slide + fade)
• Home page: Current weather with animated effects (rain/snow/sun glow), 24-hour temperature & humidity line chart, 7-day forecast
• Detail page: Circular gauge widgets for temperature, humidity, pressure, and AQI; UV index bar; wind speed & direction display
• Settings page: Temperature unit toggle (°C/°F), city selection dropdown, refresh interval slider, about section
• Simulated sensor data with realistic fluctuations for demo purposes
• Dark-themed UI with consistent color palette
• Bottom navigation bar with icon + label buttons

Architecture

MVC-like separation with reusable widget components:

• weather_data (Model) — simulated weather data engine
• page_home / page_detail / page_settings (View) — page lifecycle with create/update/destroy
• weather_dashboard_main (Controller) — app entry, navigation, timers
• chart_widget / gauge_widget — self-contained reusable components
• weather_anim — particle-based weather effect animations

Files (10 source files)

weather_dashboard/
├── CMakeLists.txt
├── Kconfig
├── Make.defs
├── Makefile
├── README.md
├── README_zh-cn.md
├── weather_dashboard_main.c
└── src/
    ├── weather_data.h
    ├── weather_data.c
    ├── weather_ui.h
    ├── page_home.c
    ├── page_detail.c
    ├── page_settings.c
    ├── chart_widget.c
    ├── gauge_widget.c
    └── weather_anim.c

Build

CONFIG_LVX_USE_DEMO_WEATHER_DASHBOARD=y

Dependencies

• LVGL (v9.x) with chart support
• libuv
• NuttX RTOS