Warning, /education/gcompris/external/qml-box2d/examples/revolute/revolute.qml is written in an unsupported language. File is not indexed.

 import QtQuick 2.0
 import Box2D 2.0
 import "../shared"
 
 Item {
     id: screen
     width: 800
     height: 600
     focus: true
 
     Keys.onPressed: {
         if (event.key === Qt.Key_Left) {
             revolute.motorSpeed -= 10;
         }
         else if (event.key === Qt.Key_Right) {
             revolute.motorSpeed += 10
         }
     }
 
     Text {
         anchors {
             right: parent.right
             top: parent.top
             left: parent.left
         }
         height: 40
         horizontalAlignment: Text.AlignHCenter;
         text: "Left/Right buttons to control the speed, Mouse click to activate/deactivate motor"
     }
 
     // BOX2D WORLD
     World { id: physicsWorld }
 
     PhysicsItem {
         id: rod
         sleepingAllowed: false
         bodyType: Body.Dynamic
         x: 350
         y: 300
 
         width: 250
         height: 40
 
         fixtures: Box {
             width: rod.width
             height: rod.height
             density: 1;
             friction: 1;
             restitution: 0.3;
         }
 
         Rectangle {
             color: "green"
             radius: 6
             anchors.fill: parent
         }
     }
 
     PhysicsItem {
         id: middle
 
         x: 400
         y: 300
 
         fixtures: Circle { radius: itemShape.radius }
 
         Rectangle {
             id: itemShape
             radius: width / 2
             width: 40; height: 40
             color: "black"
         }
     }
 
     RevoluteJoint {
         id: revolute
         maxMotorTorque: 1000
         motorSpeed: 0
         enableMotor: false
         bodyA: middle.body
         bodyB: rod.body
         localAnchorA: Qt.point(20,20)
     }
 
     // Debug
     DebugDraw {
         id: debugDraw
         world: physicsWorld
         opacity: 0.5
         visible: false
     }
 
     MouseArea {
         anchors.fill: parent
         onClicked: revolute.enableMotor = !revolute.enableMotor
     }
 }