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js/weather_system.js

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+"use strict";
+
+(function (global) {
+  const WEATHER_STATES = Object.freeze(["sunny", "cloudy", "light_rain"]);
+
+  const WeatherSystem = Object.freeze({
+    states: WEATHER_STATES,
+
+    chooseNext(current = "sunny") {
+      const choices = current === "light_rain"
+        ? ["sunny", "cloudy"]
+        : ["sunny", "cloudy", "light_rain"];
+      return pick(choices);
+    },
+
+    resetTimer() {
+      return rand(CONFIG.weatherChangeMin, CONFIG.weatherChangeMax);
+    },
+
+    shouldDropRainWater(worldRef, dt = 0) {
+      return Boolean(
+        worldRef?.weather === "light_rain" &&
+        (worldRef.itemCounts?.water || 0) < 24 &&
+        Math.random() < Math.max(0, Number(dt) || 0) * 0.12
+      );
+    },
+
+    createRainWaterItem(worldRef) {
+      const drop = new Item("water", rand(58, worldRef.w - 58), rand(58, worldRef.h - 58));
+      drop.amount = rand(24, 58);
+      return drop;
+    },
+
+    applyNextWeather(worldRef) {
+      if (!worldRef) return null;
+      const previous = worldRef.weather || "sunny";
+      const next = this.chooseNext(previous);
+      worldRef.weather = next;
+      worldRef.nextWeatherChange = this.resetTimer();
+      if (next !== previous) {
+        worldRef.emit?.("weather:changed", { previous, next });
+        worldRef.log?.(`\u5929\u6c17: ${weatherLabel(next)}`);
+      }
+      return next;
+    },
+  });
+
+  global.TarinaiWeatherSystem = WeatherSystem;
+})(typeof window !== "undefined" ? window : globalThis);