fun: life and death

app/ecs/components/alive.js

@@ -0,0 +1,53 @@
+import Component from '@/ecs/component.js';
+
+export default class Alive extends Component {
+  instanceFromSchema() {
+    const {ecs} = this;
+    return class AliveInstance extends super.instanceFromSchema() {
+      $$dead = false;
+      acceptDamage(amount) {
+        const health = Math.min(this.maxHealth, Math.max(0, this.health + amount));
+        this.health = health;
+        if (0 === health) {
+          this.die();
+        }
+      }
+      die() {
+        if (this.$$dead) {
+          return;
+        }
+        this.$$dead = true;
+        const {Ticking} = ecs.get(this.entity);
+        if (Ticking) {
+          const ticker = this.$$death.ticker();
+          ecs.addDestructionDependency(this.entity.id, ticker);
+          Ticking.add(ticker);
+        }
+      }
+    };
+  }
+  async load(instance) {
+    // heavy handed...
+    if ('undefined' !== typeof window) {
+      return;
+    }
+    instance.$$death = await this.ecs.readScript(
+      instance.deathScript,
+      {
+        ecs: this.ecs,
+        entity: this.ecs.get(instance.entity),
+      },
+    );
+    if (0 === instance.maxHealth) {
+      instance.maxHealth = instance.health;
+    }
+  }
+  static properties = {
+    deathScript: {
+      defaultValue: '/assets/misc/death-default.js',
+      type: 'string',
+    },
+    health: {type: 'uint32'},
+    maxHealth: {type: 'uint32'},
+  };
+}

app/ecs/components/vulnerable.js

@@ -20,10 +20,17 @@ export default class Vulnerable extends Component {
   instanceFromSchema() {
     const Component = this;
     return class VulnerableInstance extends super.instanceFromSchema() {
-      damages = {};
       id = 0;
       Types = DamageTypes;
       damage(specification) {
+        const {Alive} = Component.ecs.get(this.entity);
+        if (Alive) {
+          switch (specification.type) {
+            case DamageTypes.PAIN: {
+              Alive.acceptDamage(specification.amount);
+            }
+          }
+        }
         Component.markChange(this.entity, 'damage', {[this.id++]: specification});
       }
     };

app/react/components/dom/damage.jsx

@@ -34,7 +34,7 @@ function Damage({
     <div
       className={styles.damage}
       style={{
-        '--magnitude': Math.max(1, Math.floor(Math.log10(amount))),
+        '--magnitude': Math.max(1, Math.floor(Math.log10(Math.abs(amount)))),
         '--positionX': `${position.x * scale - camera.x}px`,
         '--positionY': `${position.y * scale - camera.y}px`,
         '--randomnessX': randomness.x,
@@ -44,7 +44,7 @@ function Damage({
         zIndex,
       }}
     >
-      <p>{amount}</p>
+      <p>{Math.abs(amount)}</p>
     </div>
   );
 }

app/react/components/dom/damage.module.css

@@ -92,20 +92,42 @@
 }
 
 @keyframes fade {
-  0% { --opacity: 0.75; }
-  25% { --opacity: 1; }
-  91.6% { --opacity: 1; }
-  100% { --opacity: 0; }
+  0% {
+    --opacity: 0.75;
+  }
+  25% {
+    --opacity: 1;
+  }
+  91.6% {
+    --opacity: 1;
+  }
+  100% {
+    --opacity: 0;
+  }
 }
 
 @keyframes grow {
-  0% { --scale: 0.35; }
-  33% { --scale: 1; }
-  45% { --scale: 1; }
-  40% { --scale: 1.5; }
-  45% { --scale: 1; }
-  91.6% { --scale: 1; }
-  95% { --scale: 0; }
+  0% {
+    --scale: 0.35;
+  }
+  33% {
+    --scale: 1;
+  }
+  45% {
+    --scale: 1;
+  }
+  40% {
+    --scale: 1.5;
+  }
+  45% {
+    --scale: 1;
+  }
+  91.6% {
+    --scale: 1;
+  }
+  95% {
+    --scale: 0;
+  }
 }
 
 @keyframes pain {

app/react/components/dom/entities.jsx

@@ -4,6 +4,7 @@ import {usePacket} from '@/react/context/client.js';
 import {useEcs, useEcsTick} from '@/react/context/ecs.js';
 import {parseLetters} from '@/util/dialogue.js';
 
+import Damages from './damages.jsx';
 import Entity from './entity.jsx';
 
 export default function Entities({
@@ -14,6 +15,7 @@ export default function Entities({
 }) {
   const [ecs] = useEcs();
   const [entities, setEntities] = useState({});
+  const [damages, setDamages] = useState({});
   usePacket('EcsChange', async () => {
     setEntities({});
   }, [setEntities]);
@@ -90,17 +92,18 @@ export default function Entities({
       }
       const {damage} = update.Vulnerable || {};
       if (damage) {
-        const {damages} = updating[id].Vulnerable;
         for (const key in damage) {
-          damages[key] = damage[key];
-          damages[key].onClose = () => {
-            setEntities((entities) => ({
-              ...entities,
-              [id]: ecs.rebuild(id),
-            }));
-            delete damages[key];
+          const composite = [id, key].join('-');
+          damage[key].onClose = () => {
+            setDamages((damages) => {
+              const {[composite]: _, ...rest} = damages; // eslint-disable-line no-unused-vars
+              return rest;
+            })
           };
-
+          setDamages((damages) => ({
+            ...damages,
+            [composite]: damage[key],
+          }));
         }
       }
     }
@@ -128,6 +131,11 @@ export default function Entities({
   return (
     <>
       {renderables}
+      <Damages
+        camera={camera}
+        damages={damages}
+        scale={scale}
+      />
     </>
   );
 }

app/react/components/dom/entity.jsx

@@ -1,7 +1,6 @@
 import {memo} from 'react';
 
 import Dialogues from './dialogues.jsx';
-import Damages from './damages.jsx';
 
 function Entity({camera, entity, scale}) {
   return (
@@ -13,13 +12,6 @@ function Entity({camera, entity, scale}) {
           scale={scale}
         />
       )}
-      {entity.Vulnerable && (
-        <Damages
-          camera={camera}
-          damages={entity.Vulnerable.damages}
-          scale={scale}
-        />
-      )}
     </>
   )
 }

app/server/create/homestead.js

@@ -138,6 +138,7 @@ export default async function createHomestead(id) {
     VisibleAabb: {},
   });
   const kitty = {
+    Alive: {health: 100},
     Behaving: {
       routines: {
         initial: '/assets/kitty/initial.js',

public/assets/magic-swords/collision-start.js

@@ -1,8 +1,8 @@
 const playerEntity = ecs.lookupPlayerEntity(entity.Owned.owner);
 if (playerEntity !== other && other.Vulnerable) {
-  const magnitude = Math.floor(Math.random() * 3)
+  const magnitude = Math.floor(Math.random() * 2)
   other.Vulnerable.damage({
-    amount: Math.floor(
+    amount: -Math.floor(
       Math.pow(10, magnitude)
       + Math.random() * (Math.pow(10, magnitude + 1) - Math.pow(10, magnitude)),
     ),

public/assets/misc/death-default.js

@@ -0,0 +1,19 @@
+const {Sprite, Ticking} = entity;
+if (Sprite) {
+  const {promise} = transition(
+    entity.Sprite,
+    {
+      scaleX: {
+        duration: 0.25,
+        magnitude: -entity.Sprite.scaleX,
+      },
+      scaleY: {
+        duration: 0.25,
+        magnitude: entity.Sprite.scaleY * 2,
+      },
+    },
+  )
+  Ticking.add(promise);
+  await promise;
+  ecs.destroy(entity.id);
+}