[Phil]

Hi. Since updating to Felgo 2.6, I’m having a couple of problems accessing the properties of some entities and boxColliders. In Felgo 2.5 I can access a property I defined by using: selectedBody.parent.myProperty, but I’m now getting an error. I’ve included some example code below. Thanks, Phil

 

Common.LevelBase {
    //...

    EntityBase {
        //...
        
        MouseArea {
            //...
        
            onPositionChanged: {
                selectedBody = physicsWorld.bodyAt(Qt.point(mouseX, mouseY))
                selectedBody.parent.isDead = true    // error in this line
                var splatid = entityManager.createEntityFromUrlWithProperties(Qt.resolvedUrl("Splat.qml"),{x:selectedBody.getWorldCenter().x, y:selectedBody.getWorldCenter().y})
                var splat = entityManager.getEntityById(splatid)
                splat.colorString = selectedBody.parent.colorString    // error in this line
            }
        }
    }
}

The qml files for my entities are:

EntityBase {
    //...

    property bool isDead: false
    property string colorString: "green"
    
    BoxCollider {
        //...
    }
}

and Splat.qml :

EntityBase {
    //...

    property string colorString: "red"
    
    Image {
        //...
    }
}

 

[GüntherFelgo Team]

Hi Phil!

Many things changed with the Box2D update, including how to access the associated entity of a body.
There is a new property target now, so “selectedBody.target.colorString” should work.
You can have a look at the Box 2D Upgrade Guide to see what else has changed.

Best,
Günther

[Phil]

Hi Günther. Thanks for your help. Using the property target solved some of my problems. However, I find that if I define my own property within a boxCollider I cannot access it. Is it no longer possible to do this in the update? If so, I shall avoid this in the future. Thanks, Phil

 

BoxCollider {

    property double myProperty

    //...
}

 

[GüntherFelgo Team]

Hi Phil!

Currently, it is not possible anymore to directly access the collider object that is linked with the box2d body.
To get your game to work again, you could introduce a property alias within your entity that allows to access the collider properties.

    EntityBase {
      // ...

      property alias collider: collider

      BoxCollider {
        id: collider
        property string myProperty: "Hello from Collider!"
        // ...
      }
    }

    function myFunction() {
      var body = world.bodyAt(...)
      var entity = body.target
      var collider = entity.collider
      console.log("COLLIDER-PROPERTY: "+collider.myProperty)
    }

Of course, you can also move your properties to the entity and keep the collider clean, if you prefer that.

 

Best,
Günther