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Platformer with Level Editor

 import Felgo 3.0
 import QtQuick 2.0

 // This sensor is always at the bottom of the level, directly
 // below the player. So the player touches it just before he
 // would fall out of bounds at the bottom of the level.
 // When he touches it, he dies.
 EntityBase {
   id: resetSensor
   entityType: "resetSensor"

   // the player
   property var player

   // set the position to below the player, at the bottom of the level
   x: player.x
   y: 0

   // set size
   width: player.width
   height: 10

   // only visible and enabled when playing, not when editing
   visible: !player.inLevelEditingMode
   enabled: !player.inLevelEditingMode

   // this is emitted, when the sensor collides with the player
   signal contact

   // this collider checks if the player hits the bottom of the level
   BoxCollider {
     anchors.fill: parent
     collisionTestingOnlyMode: true

     // Category7: reset sensor
     categories: Box.Category6
     // Category1: player body
     collidesWith: Box.Category1

     fixture.onBeginContact: {
       var otherEntity = other.getBody().target

       // If the player hits the sensor, we emit a signal which will be used to
       // reset the player.
       if(otherEntity.entityType === "player") {
         // We could also directly modify the player position here, but the
         // signal approach is a bit cleaner and helps separating the components.
         resetSensor.contact()
       }
     }
   }

   // The rectangle and text are just for you to see how the
   // sensor moves - set visible to true, to see it.
   Rectangle {
     visible: false

     y: -resetSensor.height

     width: parent.width
     height: parent.height

     anchors.horizontalCenter: parent.horizontalCenter
     color: "yellow"
     opacity: 0.5

     Text {
       y: -resetSensor.height

       anchors.centerIn: parent
       text: "reset sensor"
       color: "white"
       font.pixelSize: 9