Fluid Entity Interface

Basic API

Obtain fluid interface

In your systems, statically import com.artemis.E. This exposes E(entityId)

Usage

Fluid interface directly exposes methods to create, remove, and access and alter components it knows about. Method calls can be chained. E(entityId).pos(5,5).angle(10).anim("monkey").

Basic calls

Access component

Pos pos = E(entityId)._pos();

Conventions:

• Returns null if no component exists.

Access component field

given Anim .. { public Cell cell; }

Example:

Cell cell = E(entityId).animCell();
E(entityId).animCell(cell);

Conventions:

• This call creates missing components to avoid NPE checks.
• See internals below for conventions generating field getters/setters.

Access component method

given

class Anim extends Component
{ 
  public Vector getXY() { .. } 
  public void setXY(int x, int y) { .. }  
  public void setXY(Vector v) { .. }  
}

Example:

e = E(Id);
Vector v2 = e.posXY();
e.posXY(5,5).posXY(new Vector(10,10));

Conventions:

• This call creates missing components to avoid NPE checks.
• See internals below for conventions generating field getters/setters.

Check component exists

E(id).hasPos()

Call overview

Conventions for components

on component	Exposed as	if missing	comments
Pos	E ::pos()	create	chainable
Pos	E ::pos(E e2)	mirror e2	chainable
Pos	Pos E::_pos()	null	Getter.
Pos.x	int E::posX()	create	chainable
Pos.x	E E::posX(x)	create	getter
public Pos::set(x,y)	E E::pos(x,y)	create	chainable
public Pos::clear()	E E::posClear()	create	chainable
public Pos::setX(x)	E E::posX(x)	create	chainable
public int Pos::getX()	int E::posX()	create	getter
public Pos::setDepth(z)	E E::posDepth(z)	create	chainable
public float Pos::getDepth()	float E::posDepth()	create	getter
Flag (empty) Invisible	E ::invisible(boolean create)	see parameter	components with no public fields and methods are treated as flags. Additional to E::invisible()
Flag (empty) Invisible	E ::isInvisible()	-	Returns true if has component `false if not.