Click to move & pathfind

[salsa2k]

Hi,

I have 3 questions, all related to actor movement.

1. Clicking to move an actor:

I'm trying to make a click to move but the movement is not going in the right direction.

  public onInitialize(engine: ex.Engine) {
    engine.input.pointers.primary.on('down', (evt) => this.MoveTo(evt));
    this.graphics.use(this.sprite);
  }

  public MoveTo(evt: ex.Input.PointerEvent) {
    const dir = evt.worldPos.add(this.pos);
    this.actions.moveTo(dir, this.playerSpeed);
  }

2. How do I stop an actor if I want to change the direction or simply stop the actor?

3. There is any pathfinder solution? I did not find anything in the documentation.

Thanks :)

[eonarheim]

Hi @salsa2k

1. I think you can just use the evt.worldPos in your moveTo no need to do any arithmetic on the pointer event world position. moveTo let's you specify an absolute word position, moveBy would be relative to the current actors position👍

  public MoveTo(evt: ex.Input.PointerEvent) {
    this.actions.moveTo(evt.worldPos, this.playerSpeed);
  }

2. You can stop any running actions with the this.actions.clearActions() , I'll admit that method doesn't have the best name... perhaps "stop()" or "stopActions()"?

3. We don't have anything built in for pathfinding, but we have done A* pathfinding in a jam game before (warning old version of excalibur). In this example we build up a grid of positions that an actor can be in called "WaypointNodes" and using A* to pathfind https://github.com/excaliburjs/ludum-38/blob/master/game/WaypointGrid.ts enemies could then wander to a specific node and build up a path to follow with actions https://github.com/excaliburjs/ludum-38/blob/master/game/Enemy.ts#L135

• I want to pull this pathfinding into a standalone sample, I should have some time this week to do that 👍

Hope this helps!

[florianjs]

I know that this discussion is old, but I'm trying to implement easystar (https://github.com/prettymuchbryce/easystarjs)
Thing is, I need to convert worldPos into 'Grid Position'. Will keep you update

[eonarheim]

@florianjs Definitely keep us posted!

Take a look at what we did here, might help plug in easystar

https://github.com/excaliburjs/sample-tactics/tree/main/src/path-finding