Package com.csse3200.game.entities

Class Entity

java.lang.Object
com.csse3200.game.entities.Entity
Direct Known Subclasses:
LevelWaves
public class Entity extends Object
Core entity class. Entities exist in the game and are updated each frame. All entities have a position and scale, but have no default behaviour. Components should be added to an entity to give it specific behaviour. This class should not be inherited or modified directly.

Example use: 

 Entity player = new Entity()
   .addComponent(new RenderComponent())
   .addComponent(new PlayerControllerComponent());
 ServiceLocator.getEntityService().register(player);

  • Constructor Details

    • Entity

      public Entity()

  • Method Details

    • setEnabled

      public void setEnabled(boolean enabled)
      Enable or disable an entity. Disabled entities do not run update() or earlyUpdate() on their components, but can still be disposed.
      Parameters:
      enabled - true for enable, false for disable.

    • getPosition

      public com.badlogic.gdx.math.Vector2 getPosition()
      Get the entity's game position.
      Returns:
      position

    • setPosition

      public void setPosition(com.badlogic.gdx.math.Vector2 position)
      Set the entity's game position.
      Parameters:
      position - new position.

    • setPosition

      public void setPosition(float x, float y)
      Set the entity's game position.
      Parameters:
      x - new x position
      y - new y position

    • setPosition

      public void setPosition(com.badlogic.gdx.math.Vector2 position, boolean notify)
      Set the entity's game position and optionally notifies listeners.
      Parameters:
      position - new position.
      notify - true to notify (default), false otherwise

    • getScale

      public com.badlogic.gdx.math.Vector2 getScale()
      Get the entity's scale. Used for rendering and physics bounding box calculations.
      Returns:
      Scale in x and y directions. 1 = 1 metre.

    • setScale

      public void setScale(com.badlogic.gdx.math.Vector2 scale)
      Set the entity's scale.
      Parameters:
      scale - new scale in metres

    • setScale

      public Entity setScale(float x, float y)
      Set the entity's scale.
      Parameters:
      x - width in metres
      y - height in metres
      Returns:

    • scaleWidth

      public void scaleWidth(float x)
      Set the entity's width and scale the height to maintain aspect ratio.
      Parameters:
      x - width in metres

    • scaleHeight

      public void scaleHeight(float y)
      Set the entity's height and scale the width to maintain aspect ratio.
      Parameters:
      y - height in metres

    • getCenterPosition

      public com.badlogic.gdx.math.Vector2 getCenterPosition()
      Get the entity's center position
      Returns:
      center position

    • getComponent

      public <T extends Component> T getComponent(Class<T> type)
      Get a component of type T on the entity.
      Type Parameters:
      T - The component type, e.g. RenderComponent
      Parameters:
      type - The component class, e.g. RenderComponent.class
      Returns:
      The entity component, or null if nonexistent.

    • addComponent

      public Entity addComponent(Component component)
      Add a component to the entity. Can only be called before the entity is registered in the world.
      Parameters:
      component - The component to add. Only one component of a type can be added to an entity.
      Returns:
      Itself

    • removeComponent

      public void removeComponent(Class<? extends Component> componentClass)

    • dispose

      public void dispose()
      Dispose of the entity. This will dispose of all components on this entity.

    • create

      public void create()
      Create the entity and start running. This is called when the entity is registered in the world, and should not be called manually.

    • earlyUpdate

      public void earlyUpdate()
      Perform an early update on all components. This is called by the entity service and should not be called manually.

    • update

      public void update()
      Perform an update on all components. This is called by the entity service and should not be called manually.

    • getId

      public int getId()
      This entity's unique ID. Used for equality checks
      Returns:
      unique ID

    • getEvents

      public EventHandler getEvents()
      Get the event handler attached to this entity. Can be used to trigger events from an attached component, or listen to events from a component.
      Returns:
      entity's event handler

    • getFlagForDelete

      public boolean getFlagForDelete()

    • setFlagForDelete

      public void setFlagForDelete(boolean condition)
      Flag the entity for deletion. This will be deleted at the end of the frame.
      Parameters:
      condition - true to flag for deletion, false to unflag

    • equals

      public boolean equals(Object obj)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • getLayer

      public int getLayer()

    • setLayer

      public int setLayer(int layer)

    • getName

      public String getName()