From bad36b088cd8bba056813434ec7e0f83d27dfc23 Mon Sep 17 00:00:00 2001
From: Mael Kerichard <38262536+Pixselve@users.noreply.github.com>
Date: Wed, 24 Jan 2024 23:30:32 +0100
Subject: [PATCH] feat: only send elements in a certain radius

---
 packages/server/src/index.ts     |  7 +++--
 packages/server/src/lib/Scene.ts | 48 ++++++++++++++++++++++++--------
 packages/shared/src/constants.ts |  6 ++--
 3 files changed, 45 insertions(+), 16 deletions(-)

diff --git a/packages/server/src/index.ts b/packages/server/src/index.ts
index 1f522c4..f2d4a73 100644
--- a/packages/server/src/index.ts
+++ b/packages/server/src/index.ts
@@ -34,12 +34,15 @@ io.on(SOCKET_EVENTS.CONNECT, (socket) => {
 
 // interval to refill the food
 setInterval(() => {
-  scene.addRandomFood(2);
+  scene.addRandomFood(100);
 }, 1000);
 
 setInterval(() => {
   scene.update();
-  io.emit(SOCKET_EVENTS.FRAME, scene.dto);
+
+  for (let player of scene.playerArray) {
+    player.socket.emit(SOCKET_EVENTS.FRAME, scene.povDto(player));
+  }
 }, 1000 / TPS);
 
 io.listen(4000);
diff --git a/packages/server/src/lib/Scene.ts b/packages/server/src/lib/Scene.ts
index c61711b..290f601 100644
--- a/packages/server/src/lib/Scene.ts
+++ b/packages/server/src/lib/Scene.ts
@@ -1,4 +1,5 @@
 import {
+  FIELD_OF_VIEW_RADIUS,
   FOOD_PICKUP_RADIUS,
   FoodDTO,
   MAP_HEIGHT,
@@ -29,7 +30,15 @@ export class Scene {
    * @param number number of food to add
    */
   public addRandomFood(number: number = 1) {
-    this.food = this.food.concat(randomFood(number));
+    for (let i = 0; i < number; i++) {
+      this.food.push({
+        id: uuidv4(),
+        position: {
+          x: Math.floor(Math.random() * this.width),
+          y: Math.floor(Math.random() * this.height),
+        },
+      });
+    }
   }
 
   /**
@@ -119,18 +128,33 @@ export class Scene {
       orbs: this.orbs,
     };
   }
-}
 
-export function randomFood(number: number = 1) {
-  const food: FoodDTO[] = [];
-  for (let i = 0; i < number; i++) {
-    food.push({
-      id: uuidv4(),
-      position: {
-        x: Math.floor(Math.random() * 1000),
-        y: Math.floor(Math.random() * 1000),
-      },
+  public povDto(player: Player): SceneDTO {
+    // Only send what the player can see in a radius of 100
+    const povPlayers = this.playerArray.filter((p) => {
+      return (
+        Math.abs(p.head.x - player.head.x) < FIELD_OF_VIEW_RADIUS &&
+        Math.abs(p.head.y - player.head.y) < FIELD_OF_VIEW_RADIUS
+      );
+    });
+    const povFood = this.food.filter((f) => {
+      return (
+        Math.abs(f.position.x - player.head.x) < FIELD_OF_VIEW_RADIUS &&
+        Math.abs(f.position.y - player.head.y) < FIELD_OF_VIEW_RADIUS
+      );
+    });
+    const povOrbs = this.orbs.filter((o) => {
+      return (
+        Math.abs(o.position.x - player.head.x) < FIELD_OF_VIEW_RADIUS &&
+        Math.abs(o.position.y - player.head.y) < FIELD_OF_VIEW_RADIUS
+      );
     });
+    return {
+      width: this.width,
+      height: this.height,
+      players: povPlayers.map((p) => p.dto),
+      food: povFood,
+      orbs: povOrbs,
+    };
   }
-  return food;
 }
diff --git a/packages/shared/src/constants.ts b/packages/shared/src/constants.ts
index 1e9422f..6b97f45 100644
--- a/packages/shared/src/constants.ts
+++ b/packages/shared/src/constants.ts
@@ -53,8 +53,10 @@ export const SCORE_PER_FOOD = SCORE_PER_BODY_PART;
  */
 export const MIN_SCORE_TO_SPRINT = SCORE_PER_BODY_PART * 4;
 
-export const MAP_WIDTH = 1000;
-export const MAP_HEIGHT = 1000;
+export const MAP_WIDTH = 10000;
+export const MAP_HEIGHT = 10000;
+
+export const FIELD_OF_VIEW_RADIUS = 500;
 
 /**
  * Enum for socket events.