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StackTheBox Demo

 import QtQuick 2.0
 import Felgo 4.0

 EntityBase {
   id: box
   entityType: "box"

   // the origin (the 0/0 position of the entity) of this entity is the center, thus we cannot use an anchors.fill: parent in Image and BoxCollider, otherwise it would use the top left corner as origin
   width: 32
   height: 32

   // the 0/0 of the entity should be the center of the collider and image
   // this is required when a width & height are set to the entity! in that case, the rotation should be applied around the center (which is top-left, not the width/2,height/2 Item.Center which is the default value)
   transformOrigin: Item.TopLeft

   Image {
     id: boxImage
     source: Qt.resolvedUrl("../../assets/img/box.png")

     // set the size of the image to the one of the collider and not vice versa, because the physics properties depend on the collider size
     anchors.fill: boxCollider
   }

   BoxCollider {
     id: boxCollider

     // the size effects the physics settings (the bigger the heavier)
     // this is set automatically in any collider - the default size is the one of parent!
     //width: parent.width
     //height: parent.height
     // the collider should have its origin at the x/y of the entity (so the center is in the TopLeft)
     x: -width/2
     y: -height/2

     friction: 1.6
     restitution: 0 // restitution is bounciness - a wooden box doesn't bounce
     density: 0.1 // this makes the box more heavy

     fixture.onBeginContact: (other, contactNormal) => {
       // when colliding with another entity, play the sound and start particleEffect
       collisionSound.play();
       collisionParticleEffect.start();
     }
   }

   // the soundEffect is played at a collision
   GameSoundEffect {
     id: collisionSound
     source: Qt.resolvedUrl("../../assets/snd/boxCollision.wav")
   }

   // the ParticleEffect is started at a collision
   GameParticle {
     id: collisionParticleEffect
     // make the particles float independent from the entity position - this would be the default setting, but for making it clear it is added explicitly here as well
     positionType: 0