Problem recycling objects.

[Cutu]

Hey guys its me again, I'm having some issues recyling objects when calling the kill() method.

As you can see in the gif I call the kill() method after the player overlaps with the invisible blocks adding 1 point to the score. the problem is that when they're dead they respawn and stay on top of the screen and after the pool of invisible walls is over the game get stuck giving a "Cannot read property 'reset' of null" because they get stuck.

This is the code of the walls.

//Create

        this.walls = this.game.add.group();
        this.walls.enableBody = true;
        this.walls.createMultiple(250,"wall1");
        this.wallSpeed = 250;
        this.wallsDelay = 1000;
        
        this.timer = this.game.time.events.loop(this.wallsDelay, this.addWallRow, this);

//Update
this.game.physics.arcade.overlap(this.player, this.pointBlocks, (function(player,pointBlocks) { pointBlocks.body.enable = false;
pointBlocks.kill();
this.score += 0.5;
this.scoreText.setText(this.score.toString());
}).bind(this));

//And the create methods of the walls

addWall: function(x,y,immovable) {                
        
        if(immovable) {
            var wall = this.walls.getFirstDead();
        } else {
            var wall = this.pointBlocks.getFirstDead();
        }
        
        wall.reset(x,y);
        wall.body.velocity.y = this.wallSpeed;
        wall.body.immovable = immovable;
       
        wall.checkWorldBounds = true;
        wall.outOfBoundsKill = true;
        wall.events.onOutOfBounds.add((function() {wall.kill(); console.log(wall.exists);}).bind(this));
}

addWallRow: function() {
        
        this.wallSpeed += 5;
        
        var tilesNeeded = Math.ceil(this.game.world.width / this.wallWidth);
        
        var hole = Math.floor(Math.random() * (tilesNeeded - 3)) + 1;
        
        for(var i=0;i<tilesNeeded;i++) {
            if(i != hole && i != hole + 1) {
                this.addWall(i * this.wallWidth, 0, true);
            } else {
                this.addWall(i * this.wallWidth, 0, false);
            }
        }
}

I hope you guys can help me with this one! Thanks in advance!

[phreaknation]

I have a game that I was working on a game a while back and I think you can reverse engineer my projectile code to do what you want

Player.prototype.createProjectile = function(weaponGroup, weaponType, options) {
  var projectile = false;
  var projectileType = weaponGroup.toUpperCase() + ':' + weaponType.toUpperCase();
  if (this._projectiles.indexOf(projectileType) != -1) {
    if (Object.keys(this.weapons[weaponGroup.toLowerCase()]).indexOf(weaponType.toLowerCase()) !== -1) {
      var group = options.group;

      projectile = group.getFirstDead();
      if (projectile === null) {
        projectile = new Projectile(this, options);
      }

      projectile.events.onKilled.add((function() {
        if (projectile.trail) {
          if (projectile.drunkTimer) {
            projectile.drunkTimer.stop();
          }
          projectile.trail.kill();
        }
        if (this.thrust) {
          this.thrust.kill();
          this.thrust.destroy();
        }
        projectile.destroy();
        projectile.options.group.remove(projectile);
      }).bind(projectile));

      projectile.options.group.add(projectile);
    }
  }
  return projectile;
};

 

[Cutu]

Hey @phreaknation thanks for your answer, I already fixed the problem, I had to delete this line

pointBlocks.body.enable = false;

in my overlap callback, because when it calls the reset method in the createWall function the sprite has no body and stay stuck in the top, anyways thank you!

[phreaknation]

Sure thing. The code might be worth a look at still. If you care, lol

[samme]

sprite.reset() and sprite.body.reset() do not re-enable a disabled body (kind of surprising); you have to do it yourself:

wall.body.enable = true;
wall.reset(x, y);

The error is triggered because the sprite reference itself (`wall`) is null when there are no remaining dead blocks.