✨ Spawn farm

src/signal.ts

@@ -0,0 +1,13 @@
+export type SignalSubscriber = (props?: any) => void;
+
+export default class SignalBus {
+  subscribers: SignalSubscriber[] = [];
+
+  emit(props?: any) {
+    this.subscribers.forEach((item) => item(props));
+  }
+
+  subscribe(callback: SignalSubscriber) {
+    this.subscribers.push(callback);
+  }
+}

src/stage/index.tsx

@@ -1,10 +1,10 @@
 import { styled } from "solid-styled-components";
 import { Show, createSignal, onMount } from "solid-js";
 import { vector2d } from "./vector";
+import SignalBus from "../signal";
 
 import Player from "./objects/player";
 import Crystal from "./objects/crystal";
-import Attacker from "./objects/enemies/attacker";
 import TimerProvider from "./providers/timer";
 import CooldownProvider from "./providers/cooldown";
 import CooldownUI from "./ui/cooldown";
@@ -12,6 +12,7 @@ import CooldownUI from "./ui/cooldown";
 import "./objects/common.css";
 import OverviewProvider from "./providers/overview";
 import OverviewUI from "./ui/overview";
+import SpawnFarm, { EnemiesTemplates } from "./objects/spawn-farm";
 
 const StageContainer = styled("div")`
   width: 100vw;
@@ -25,32 +26,20 @@ const StageContainer = styled("div")`
 export default function Stage() {
   let container: HTMLDivElement = document.createElement("div");
 
+  let stageSize = new vector2d(0, 0);
   let centerPosition = new vector2d(0, 0);
   let playerPosition = new vector2d(0, 0);
 
-  let randomPosition = new vector2d(0, 0);
-
   let [ready, setReady] = createSignal(false);
 
-  function calcRandomPosition(maxX: number, maxY: number) {
-    return new vector2d(
-      Math.floor(Math.random() * maxX),
-      Math.floor(Math.random() * maxY)
-    );
-  }
+  const enemiesSpawnSignal = new SignalBus();
 
   function initializeStage(element: HTMLDivElement) {
-    centerPosition = new vector2d(
-      element.clientWidth / 2,
-      element.clientHeight / 2
-    );
+    stageSize = new vector2d(element.clientWidth, element.clientHeight);
+    centerPosition = new vector2d(stageSize.x / 2, stageSize.y / 2);
     playerPosition = centerPosition.clone();
 
-    randomPosition = calcRandomPosition(
-      element.clientWidth,
-      element.clientHeight
-    );
-    console.log("example pos:", randomPosition);
+    setInterval(() => enemiesSpawnSignal.emit(), 1000)
 
     setReady(true);
   }
@@ -67,7 +56,13 @@ export default function Stage() {
               <Crystal size={128} position={centerPosition} />
               <Player size={64} position={playerPosition} />
 
-              <Attacker size={32} position={randomPosition} />
+              {/* Object Sets */}
+              <SpawnFarm
+                templates={EnemiesTemplates}
+                signal={enemiesSpawnSignal}
+                borderX={stageSize.x}
+                borderY={stageSize.y}
+              />
 
               {/* UI Elements */}
               <CooldownUI />

src/stage/objects/enemies/attacker.tsx

@@ -10,8 +10,8 @@ export default function Attacker(props: {
   damage?: number;
   position?: vector2d;
 }) {
-  const width = props.size ? props.size / 6 : 2;
-  const height = props.size ?? 20;
+  const width = props.size ? props.size / 6 : 5;
+  const height = props.size ?? 32;
 
   // Just some random comment
   // https://youtube.com/ishowspeed

src/stage/objects/spawn-farm.tsx

@@ -0,0 +1,67 @@
+import { createSignal, type Component, JSX, For, createMemo } from "solid-js";
+import { vector2d } from "../vector";
+import SignalBus from "../../signal";
+
+import Attacker from "./enemies/attacker";
+import { TimerContext, useTimer } from "../providers/timer";
+
+export const EnemiesTemplates = [
+  { element: Attacker, weight: 10 },
+  { element: Attacker, weight: 10 },
+];
+
+export default function SpawnFarm({
+  templates,
+  signal,
+  borderX,
+  borderY,
+}: {
+  templates: { element: Component; weight: number }[];
+  signal: SignalBus;
+  borderX: number;
+  borderY: number;
+}) {
+  const [objects, setObjects] = createSignal<JSX.Element[]>([]);
+
+  const timer = useTimer();
+
+  function createObject(template: Component, props?: any) {
+    return (
+      <TimerContext.Provider value={timer}>
+        {template(props)}
+      </TimerContext.Provider>
+    );
+  }
+
+  function pickTemplate() {
+    const totalWeight = templates.reduce((sum, { weight }) => sum + weight, 0);
+    const randomNumber = Math.random() * totalWeight;
+
+    let cumulativeWeight = 0;
+    for (let i = 0; i < templates.length; i++) {
+      cumulativeWeight += templates[i].weight;
+      if (randomNumber < cumulativeWeight) {
+        return templates[i].element;
+      }
+    }
+  }
+
+  function pickPosition() {
+    return new vector2d(
+      Math.floor(Math.random() * borderX),
+      Math.floor(Math.random() * borderY)
+    );
+  }
+
+  function generate() {
+    const template = pickTemplate();
+    if (template) {
+      const object = createObject(template, { position: pickPosition() });
+      setObjects(objects().concat([object]));
+    }
+  }
+
+  signal.subscribe(() => generate());
+
+  return <For each={objects()}>{(item) => item}</For>;
+}

src/stage/providers/timer.tsx

@@ -6,7 +6,7 @@ import {
   useContext,
 } from "solid-js";
 
-const TimerContext = createContext();
+export const TimerContext = createContext();
 
 export const TickDuration = 100;
 

src/stage/ui/overview.tsx

@@ -26,7 +26,7 @@ export default function OverviewUI() {
   return (
     <>
       <BottomSideContainer class="healthy-overview">
-        <div class="text-xl">Crystal {crystalHealth()}/{crystalMaxHealth()}</div>
+        <div class="text-lg">Crystal {crystalHealth()}/{crystalMaxHealth()}</div>
         <progress class="h-[4px] progress progress-error w-screen" value={regenerationProgress()} max={100} />
       </BottomSideContainer>
     </>