flying-squid/src/lib/plugins/pvp.js

var Vec3 = require("vec3").Vec3;

module.exports.player=function(player,serv)
{

  player.updateHealth = (health) => {
    player.health = health;
    player._client.write('update_health', {
      food: player.food,
      foodSaturation: 0.0,
      health: player.health
    });
  };

  function attackEntity(entityId) 
  {
    var attackedEntity = serv.entities[entityId];
    if(!attackedEntity || (attackedEntity.gameMode != 0 && attackedEntity.type == 'player')) return;

    player.behavior('attack', {
      attackedEntity: attackedEntity,
      velocity: attackedEntity.position.minus(player.position).plus(new Vec3(0, 0.5, 0)).scaled(5)
    }, (o) => o.attackedEntity.takeDamage(o));
  }

  player._client.on("use_entity", ({mouse,target} = {}) => {
    if(!serv.entities[target])
    {
      var dragon;
      for(dragon=target-1;dragon>=target-7 && !serv.entities[dragon];dragon--){}
      if(serv.entities[dragon] && serv.entities[dragon].entityType==63)
         target=dragon;
    }
    if(mouse == 1)
      attackEntity(target);
  });

  player.commands.add({
    base: 'kill',
    info: 'Kill entities',
    usage: '/kill <selector>',
    op: true,
    parse(str) {
      return str || false;
    },
    action(sel) {
      var arr = serv.selectorString(sel, player.position.scaled(1/32), player.world);
      if (arr instanceof Error) return arr.toString();
      if (arr == null) return 'Could not find player';

      arr.map(entity => entity.takeDamage({damage:20}));
    }
  });

};

module.exports.entity=function(entity,serv)
{
  entity.takeDamage=({sound='game.player.hurt', damage=1, velocity=new Vec3(0,0,0), maxVelocity=new Vec3(4, 4, 4), animation=true}) => {
    entity.updateHealth(entity.health - damage);
    serv.playSound(sound, entity.world, entity.position.scaled(1/32));

    entity.sendVelocity(velocity.scaled(1/32), maxVelocity);

    if(entity.health<=0) {
      if(animation)
        entity._writeOthers('entity_status', {
          entityId: entity.id,
          entityStatus: 3
        });
      if(entity.type!="player") {
        delete serv.entities[entity.id];
        setTimeout(() => {
          entity.nearbyPlayers().forEach(otherPlayer => otherPlayer.despawnEntities([entity]));
        },2000);
        // this is the duration of the despawning animation, it should change for every entity (see EnderDragon)
      }
    }
    else if (animation)
      entity._writeOthers('animation',{
        entityId:entity.id,
        animation:1
      });
  };

  if (entity.type != 'player') {
    entity.updateHealth = (health) => {
      entity.health = health;
    }
  }
};