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scripts/tutorials/entity_scripts/magneticBlock.js

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+(function(){
+
+  // Helper for detecting nearby objects
+  function findEntitiesInRange(releasedProperties) {
+    var dimensions = releasedProperties.dimensions;
+    return Entities.findEntities(releasedProperties.position, ((dimensions.x + dimensions.y + dimensions.z) / 3) *1.5);
+  }
+  function getNearestValidEntityProperties(id) {
+    var releasedProperties = Entities.getEntityProperties(id,["position", "rotation", "dimensions"]);
+    var entities = findEntitiesInRange(releasedProperties);
+    var nearestEntity = null;
+    var nearest = -1;
+    var releaseSize = Vec3.length(releasedProperties.dimensions);
+    entities.forEach(function(entityId) {
+      print('ftest ' + entityId);
+      var entity = Entities.getEntityProperties(entityId, ['position', 'rotation', 'dimensions']);
+      var distance = Vec3.distance(releasedProperties.position, entity.position);
+      var scale = releaseSize/Vec3.length(entity.dimensions);
+      if ((nearest === -1 || distance < nearest && scale >= 0.5 && scale <= 2 ) && entity.id !== entityId) {
+        nearestEntity = entity;
+        dnearest = distance;
+      }
+    })
+    return nearestEntity;
+
+  }
+
+  // Create the 'class'
+  function MagneticBlock () {  }
+  // Bind pre-emptive events
+  MagneticBlock.prototype = {
+    // When script is bound to an entity, preload is the first callback called with the entityID. It will behave as the constructor
+    preload: function (id) {
+      /*
+        We will now override any existing userdata with the grabbable property.
+        Only retrieving userData
+      */
+      var val = Entities.getEntityProperties(id, ['userData'])
+      var userData = {};
+      if (val.userData && val.userData.length > 0 ) {
+        try {
+          userData = JSON.parse(val.userData);
+        } catch (e) {}
+      }
+      // Object must be triggerable inorder to bind events.
+      userData.grabbableKey = {grabbable: true};
+      // Apply the new properties to entity of id
+      Entities.editEntity(id, {userData: JSON.stringify(userData)});
+      this.held = false;
+
+      // We will now create a custom binding, to keep the 'current' context as these are callbacks called without context
+      var t = this;
+      this.callbacks = {};
+      this.callbacks["releaseGrab"] = function () {
+        var nearest = getNearestValidEntityProperties(id);
+
+        print(JSON.stringify(nearest));
+      }
+
+      this.releaseGrab = this.callbacks["releaseGrab"];
+
+      Script.scriptEnding.connect( function () {
+        Script.removeEventHandler(id, "releaseGrab", this.callbacks["releaseGrab"]); //continueNearGrab
+      })
+    }
+  }
+  return new MagneticBlock();
+})