feat: emitter!

packages/graphics/traits/emitter.trait.js

@@ -0,0 +1,65 @@
+import {compose} from '@avocado/core';
+import {Trait} from '@avocado/entity';
+import {Property} from '@avocado/mixins';
+
+const decorate = compose(
+)
+
+export class Emitter extends decorate(Trait) {
+
+  initialize() {
+    this.emitters = {};
+  }
+
+  hooks() {
+    return {
+
+      afterDestructionTickers: () => {
+        return (elapsed) => {
+          for (const key in this.emitters) {
+            const emitter = this.emitters[key];
+            emitter.tick(elapsed);
+            if (!emitter.hasParticles()) {
+              delete this.emitters[key];
+            }
+          }
+          return 0 === Object.keys(this.emitters).length;
+        };
+      },
+
+    }
+  }
+
+  methods() {
+    return {
+
+      addEmitter: (key, emitter) => {
+        this.emitters[key] = emitter;
+      },
+
+      addEmitterRenderer: (key, renderer) => {
+        if (!this.emitters[key]) {
+          return;
+        }
+        this.emitters[key].addRenderer(renderer);
+      },
+
+      emitParticle: (key, ...args) => {
+        if (!this.emitters[key]) {
+          return;
+        }
+        this.emitters[key].emit(...args);
+      },
+
+    }
+  }
+
+  tick(elapsed) {
+    for (const key in this.emitters) {
+      const emitter = this.emitters[key];
+      emitter.tick(elapsed);
+    }
+  }
+
+}
+