src/control/MapContext.ts


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'use strict';


import Direction from '../model/Direction';
import Entity from '../model/Entity';
import EntityPosition from '../model/EntityPosition';
import MapData from '../model/MapData';
import Position from '../model/Position';

import InputHandler from '../view/InputHandler';
import MapView from '../view/MapView';


export default class MapContext {
        view: MapView;

        entities: {[key: string]: EntityPosition} = {};
        playerEntity: EntityPosition;

        constructor(private map: MapData, private inputHandler: InputHandler) {
                this.playerEntity = new EntityPosition(
                        new Entity('square'),
                        new Position(8, 8),
                        Direction.East
                );

                this.addEntity(this.playerEntity);

                this.view = new MapView(map, this.entities, (time: number) => this.updateState(time));

                inputHandler.addListener(() => {
                        if (this.updateState(performance.now()))
                                this.view.redraw();
                });
        }

        private addEntity(entity: EntityPosition) {
                this.entities[entity.position.asString()] = entity;
        }

        private updateState(time: number): boolean {
                var ret = false;
                var dir = this.playerEntity.direction;

                if (this.inputHandler.keys[InputHandler.Up])
                        dir = Direction.North;
                else if (this.inputHandler.keys[InputHandler.Right])
                        dir = Direction.East;
                else if (this.inputHandler.keys[InputHandler.Down])
                        dir = Direction.South;
                else if (this.inputHandler.keys[InputHandler.Left])
                        dir = Direction.West;

                if (this.playerEntity.direction !== dir) {
                        this.playerEntity.direction = dir;
                        ret = true;
                }

                return ret;
        }
}