impactjs

                var player = ig.game.getEntityByName('player');

                this.screen.x = player.pos.x - ig.system.width / 2 + player.size.x / 2;
                this.screen.y = player.pos.y - ig.system.height / 2 + player.size.y / 2;


                if (this.screen.x < 0) {
                    this.screen.x = 0;
                }
                if (this.screen.x > 1280 - 480) {
                    this.screen.x = 1280 - 480;
                }
                if (this.screen.y < 0) {
                    this.screen.y = 0;
                }
                if (this.screen.y > 800 - 320) {
                    this.screen.y = 800- 320;
                }