Phys2D Using mouse Listener?

Game Mechanics
#1

I’ve been using java for about a year now, and i actually wrote my own little static particle physics engine… but when i really tried to apply it in anything it just wasnt up to par so im looking into phys2d and im very impressed… but im a little bit stuck, could someone post an example showing a good way to setup a mouse listener to be used with a demo? Thanks in advanced to anyone who may be able to help :slight_smile:

#2

I didn’t use Mouse Event with Phys2D (I use the Mouse of JInput). But you could store the state of the mouse (in mouseMove, mouseDrag, mousePressed, mouseReleased event), then use it in your game logic.

What do you want to do with the mouse ? In Khumeia, I use the mouse to move object. To do so, I apply a force from the position of the mouse and the object (you have to apply it, each frame) :

(I don’t have the code right now but it look like :slight_smile:


  float x = selectedBody.getPosition().getX();
  float y = selectedBody.getPosition().getY();
  
  selectedBody.setForce( (mouseX-x)*power , (mouseY-y)*power );
#3

all i really wanted to do was like be able to click and spawn a box at the mouse pos have a box or somthing spawn there.

#4

I don’t see the problem with the mouse event.


  public void mouseClicked(MouseEvent evt)
  {
     mouseX = evt.getX();
     mouseY = evt.getY();
     addObject = true;
  }

...

// In the logic loop

  if (addObject)
  {
     // Create your object at mouseX,mouseY
     bodyOfTheNewObject  = new Body(new Box(5.0f,5.0f), 1.0f);
     bodyOfTheNewObject.setPosition(mouseX,mouseY);

     world.add( bodyOfTheNewObject );
     addObject = false;
  }

Of course, you have to deal with your object classes and your view coords.

#5

Oh, no iget the logic behind spawning the box and such, its just a phys2d demo is setup in such a weird way, with the frame being initialized in a diffrent class (Abstract Demo), i cant quite figure out a good way to add a mouse listener to it…

#6

Dooo :persecutioncomplex: my bad, I didn’t get that you speak about this framework…

Ok. The demo start with “Start()” that invoke initGUI() before initDemo() (what invoke init(World)).

I think you can add an :

frame.addMouseListener( new MouseListener() { ... } )

In the “init(World)” of your demo (not the cutest think to do but you don’t have to modify the AbstractDemo)

Edit : I just see that the DemoSandBox invoke “init(World)” too. You should test if you have allready added the listener before adding it.