feat: visible state packet

packages/graphics/packets/trait-visible.packet.js

@@ -0,0 +1,12 @@
+import {EntityPacket} from '@avocado/entity';
+
+export class TraitVisiblePacket extends EntityPacket {
+
+  static get schema() {
+    const schema = super.schema;
+    schema.data.isVisible = 'bool';
+    schema.data.opacity = 'uint8';
+    return schema;
+  }
+
+}

packages/graphics/traits/visible.trait.js

@@ -6,6 +6,7 @@ import {Rectangle, Vector} from '@avocado/math';
 
 import {Container} from '../container';
 import {hasGraphics} from '../has-graphics';
+import {TraitVisiblePacket} from '../packets/trait-visible.packet';
 
 const AUTO_ZINDEX = 1 << 16;
 
@@ -70,6 +71,13 @@ export class Visible extends decorate(Trait) {
     }
   }
 
+  acceptPacket(packet) {
+    if (packet instanceof TraitVisiblePacket) {
+      this.entity.isVisible = packet.data.isVisible;
+      this.entity.opacity = packet.data.opacity / 255;
+    }
+  }
+
   get container() {
     return this._container;
   }
@@ -83,6 +91,18 @@ export class Visible extends decorate(Trait) {
     }
   }
 
+  packetsForUpdate() {
+    const packets = [];
+    if (this.isDirty) {
+      packets.push(new TraitVisiblePacket({
+        isVisible: this.entity.isVisible,
+        opacity: Math.floor(this.entity.opacity * 255),
+      }, this.entity));
+      this.makeClean();
+    }
+    return packets;
+  }
+
   get rawVisibleScale() {
     return this._visibleScale;
   }