Add targetEntity.js

unpublishedScripts/tower-defense/targetEntity.js

@@ -0,0 +1,73 @@
+if (!Function.prototype.bind) {
+  Function.prototype.bind = function(oThis) {
+    if (typeof this !== 'function') {
+      // closest thing possible to the ECMAScript 5
+      // internal IsCallable function
+      throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
+    }
+
+    var aArgs   = Array.prototype.slice.call(arguments, 1),
+        fToBind = this,
+        fNOP    = function() {},
+        fBound  = function() {
+          return fToBind.apply(this instanceof fNOP
+                 ? this
+                 : oThis,
+                 aArgs.concat(Array.prototype.slice.call(arguments)));
+        };
+
+    if (this.prototype) {
+      // Function.prototype doesn't have a prototype property
+      fNOP.prototype = this.prototype;
+    }
+    fBound.prototype = new fNOP();
+
+    return fBound;
+  };
+}
+
+(function() {
+    function parseJSON(json) {
+        try {
+            return JSON.parse(json);
+        } catch(e) {
+            return undefined;
+        }
+    }
+
+    Target = function() {
+    }
+    Target.prototype = {
+        preload: function(entityID) {
+            this.entityID = entityID;
+            Script.addEventHandler(entityID, "collisionWithEntity", this.onCollide.bind(this));
+
+            this.entityIDsThatHaveCollidedWithMe = [];
+
+            var userData = Entities.getEntityProperties(this.entityID, 'userData').userData;
+            var data = parseJSON(userData);
+            if (data !== undefined && data.gameChannel) {
+                this.gameChannel = data.gameChannel
+            } else {
+                print("targetEntity.js | ERROR: userData does not contain a game channel");
+            }
+        },
+        onCollide: function(entityA, entityB, collision) {
+            print("Collided with: ", entityB);
+            var colliderName = Entities.getEntityProperties(entityB, 'name').name;
+
+            // If the other entity's name includes 'projectile' and we haven't hit it before,
+            // continue on.
+            if (colliderName.indexOf("projectile") > -1
+                    && this.entityIDsThatHaveCollidedWithMe.indexOf(entityB) === -1) {
+                this.entityIDsThatHaveCollidedWithMe.push(entityB);
+                Messages.sendMessage(this.gameChannel, JSON.stringify({
+                    type: "target-hit",
+                    entityID: this.entityID
+                }));
+            }
+        }
+    };
+
+    return new Target();
+});