feat: 初始化项目并提交一次代码

services/render.py

@@ -0,0 +1,40 @@
+from services.statistics import get_ammeter_left_ele, get_water_left
+from services.plot import plot_line
+
+
+async def render_ammeter_chart():
+    times, values = await get_ammeter_left_ele(limit=24)
+
+    if not times:
+        return None
+
+    out = "data/ammeter.png"
+
+    plot_line(
+        times=times,
+        values=values,
+        title="宿舍电量剩余趋势",
+        ylabel="剩余电量（度）",
+        out_path=out,
+    )
+
+    return out
+
+
+async def render_water_chart():
+    times, values = await get_water_left(limit=24)
+
+    if not times:
+        return None
+
+    out = "data/water.png"
+
+    plot_line(
+        times=times,
+        values=values,
+        title="宿舍水量剩余趋势",
+        ylabel="剩余水量（吨）",
+        out_path=out,
+    )
+
+    return out