Spawn creatures at spawnpoint created from code

[nightm4re94]

^{This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2020-02-05 12:46:37
User: YannikSchoeberl [] (age: 1004 days 🙌; posts: 14)}
Currently I'm trying to spawn some powerups in my game. If the ball collides with a block, the following code is executed:

Spawnpoint powerupSpawn = new Spawnpoint(hitObject.getLocation().getX() + 64, hitObject.getLocation().getY() + 25);
Game.world().environment().remove(hitObject);
Powerup.PowerupType type = Powerup.PowerupType.getRandomPowerupType();
String spritePrefix = Powerup.getPrefixFromType(type);
Powerup powerup = new Powerup(spritePrefix);
powerupSpawn.spawn(powerup);

Here's my class Powerup:

@EntityInfo(width = 64, height = 64)
@MovementInfo(velocity = 2000)
@CollisionInfo(collisionBoxWidth = 64, collisionBoxHeight = 64, collision = true)
public class Powerup extends Creature implements IRenderable, IUpdateable {
 public enum PowerupType {
 SLOWDOWN_BALL,
 SPEED_BALL_UP,
 BACKDOOR,
 EXTRA_LIFE;
 /**
 * Returns a random powerup type.
 *
 * @return A random powerup type.
 */
 public static PowerupType getRandomPowerupType() {
 Random random = new Random();
 return values()[random.nextInt(values().length)];
 }
 }
 public Powerup(String spritePrefix) {
 super(spritePrefix);
 this.setVelocity(500);
 this.setAcceleration(250);
 }
 /**
 * This method returns the sprite prefix according to the powerup type.
 *
 * @param type The type of the powerup.
 * @return Returns the correct sprite prefix.
 */
 public static String getPrefixFromType(PowerupType type) {
 switch (type) {
 case BACKDOOR:
 return "backdoor";
 case EXTRA_LIFE:
 return "extra_life";
 case SLOWDOWN_BALL:
 return "slowdown";
 case SPEED_BALL_UP:
 return "speed_up";
 default:
 return "";
 }
 }
 @Override
 public void update() {
 }
 @Override
 public void render(Graphics2D graphics2D) {
 Game.physics().move(this, this.getAngle(), this.getTickVelocity());
 }
}

I'm getting the following exception:
[upl-image-preview url=https://forum.litiengine.com/assets/files/2020-02-05/1580906774-709305-exception.jpeg]
What am I missing?

[nightm4re94]

^{This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2020-02-05 20:52:52
User: steffen [Admin 👑, Mod 🔧] (age: 1568 days 🔥; posts: 100)}
I think the constructor overload you currently use for Spawnpoint doesn't set the Direction which seems like a bug to me because the spawn method currently relies on this without checking for the possibility of null.
I'll improve the implementation with v0.4.19-alpha.
As a quick fix, you could call

powerupSpawn.setDirection(Direction.DOWN);

(or some other direction), before calling the spawn method.

[nightm4re94]

^{This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2020-02-05 21:14:15
User: YannikSchoeberl [] (age: 1004 days 🙌; posts: 14)}
steffen Thank you very much!