add map

common/game_basic.js

@@ -11,6 +11,8 @@ class GameBasic {
 
         this.player = player;
         this.entities = entities;
+
+        this.width = this.height = 2500;
     }
     main() {
         let { entities } = this;

common/player.js

@@ -50,7 +50,7 @@ Player.prototype.bump = function () {
 }
 
 Player.prototype.handleTick = function (game) {
-    let { entities } = game;
+    let { entities, width, height } = game;
 
     let ent = this;
 
@@ -59,6 +59,9 @@ Player.prototype.handleTick = function (game) {
     ent.pos.x += ent.vel.x;
     ent.pos.y += ent.vel.y;
 
+    ent.pos.x = Math.max(Math.min(ent.pos.x, width / 2), - width / 2);
+    ent.pos.y = Math.max(Math.min(ent.pos.y, height / 2), - height / 2);
+
     ent.vel.x *= 0.9;
     ent.vel.y *= 0.9;