super-snuvi/src/me/hammerle/supersnuvi/entity/ai/FollowHeroController.java

package me.hammerle.supersnuvi.entity.ai;

import me.hammerle.supersnuvi.entity.Entity;
import me.hammerle.supersnuvi.entity.Hero;
import me.hammerle.supersnuvi.tiles.Location;
import me.hammerle.supersnuvi.util.Face;

public class FollowHeroController extends EntityController
{
    private final double motion;
    
    public FollowHeroController(Entity ent, double motion)
    {
        super(ent);
        this.motion = motion;
    }

    @Override
    public void tick() 
    {
        Hero hero = ent.getLevel().getHero();
        if(hero.squaredDistance(ent) <= 102400)
        {
            double distance = ent.signedDistanceX(hero);
            if(distance < 0)
            {
                ent.setMotionX(motion);
            }
            else if(distance > 0)
            {
                ent.setMotionX(-motion);
            }
        }
    }

    @Override
    public void onCollideWithEntity(Entity ent, Face face) 
    {
    }

    @Override
    public void onCollideWithTile(Location loc, Face face) 
    {
        if((face == Face.LEFT || face == Face.RIGHT) && 
                Math.abs(ent.getPreviousMotionX() - ent.getMotionX()) > 0.001 &&
                Math.abs(ent.signedDistanceX(ent.getLevel().getHero())) > 0.001)
        {
            ent.jump();
        }
    }
}