Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { Directions, type PositionInterface } from "../maps/index";
import { Actor, ComponentName, Entity, isPositionComponent, MovementSystem, World } from "../engine/index";
export class MoveCommand extends Command {
protected actor: Actor;
protected direction: Directions;
protected engine: World;
public constructor(actor: Actor, direction: Directions, engine: World) {
super();
this.actor = actor;
this.direction = direction;
this.engine = engine;
}
public execute(): CommandResultInterface {
const result = this.move();
return {
message: `Move => ${this.direction}`,
result,
};
}
public undo(): CommandResultInterface | null {
const result = this.moveBack();
return {
message: `Move => ${this.direction}`,
result,
};
}
protected move(): PositionInterface | null {
let result: PositionInterface | null = null;
switch (this.direction) {
case Directions.DOWN: {
result = this.moveTo(0, 1);
break;
}
case Directions.LEFT: {
result = this.moveTo(-1, 0);
break;
}
case Directions.RIGHT: {
result = this.moveTo(1, 0);
break;
}
case Directions.UP: {
result = this.moveTo(0, -1);
break;
}
default:
}
return result;
}
protected moveBack(): PositionInterface | null {
let result: PositionInterface | null = null;
switch (this.direction) {
case Directions.DOWN: {
result = this.moveTo(0, -1);
break;
}
case Directions.LEFT: {
result = this.moveTo(1, 0);
break;
}
case Directions.RIGHT: {
result = this.moveTo(-1, 0);
break;
}
case Directions.UP: {
result = this.moveTo(0, 1);
break;
}
default:
}
return result;
}
protected moveTo(dX: number, dY: number): PositionInterface {
const newPosition: PositionInterface = { x: 0, y: 0 };
const actorPosition = this.actor.getComponent(ComponentName.POSITION);
if (isPositionComponent(actorPosition)) {
newPosition.x = Math.max(
0,
Math.min(this.engine.getMap().getWidth() - 1, actorPosition.getPosition().x + dX),
);
newPosition.y = Math.max(
0,
Math.min(this.engine.getMap().getHeight() - 1, actorPosition.getPosition().y + dY),
);
const entities = new Map<string, Entity>();
entities.set(this.actor.getId(), this.actor);
this.engine.run(new MovementSystem(entities, newPosition, this.engine.getEntities()));
}
return newPosition;
}
}
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