fix: fix the initialize

Author: iamStephenFang

PlaygroundBook/Chapters/Chapter1.playgroundchapter/Pages/Intro.playgroundpage/main.swift

@@ -11,7 +11,7 @@
 //:
 //: Before entering the playground, I want you to think about the difference between **Information** and **Knowledge**.
 //: - - -
-//: ## The difference between Information And Knowledge
+//: ## The difference between Information and Knowledge
 //: You can find a visual answer on the right side. Brifely speaking, knowledge can be achieved by establishing the relationship between entities on the basis of information. The entities are usually the real-world objects, events, situations or abstract concepts.
 //:
 //: Now that you know the difference between information and knowledge, I believe that you can understand knowledge graph as well.

PlaygroundBook/Chapters/Chapter1.playgroundchapter/Pages/Page3.playgroundpage/main.swift

@@ -23,8 +23,11 @@ import PlaygroundSupport
 var userGraph: (Graph) -> Graph = { graph in
 //#-end-hidden-code
 //#-code-completion(everything, hide)
-//#-code-completion(identifier, hide, Page_Contents)
-
+//#-code-completion(identifier, show, graph.addEntity(_ entity: Entity))
+//#-code-completion(identifier, show, graph.addEntities(_ entitiesToAdd: [Entity]))
+//#-code-completion(identifier, show, graph.addRelation(_ entity: Entity, to anotherEntity: Entity, relation: String))
+//#-code-completion(identifier, show, graph.updateRelation(_ firstEntity: Entity, to secondEntity: Entity, relation: String))
+//#-code-completion(identifier, show, graph.deleteEntity(_ entityToDelete: EntityID))
 //#-editable-code
     let Apple = Entity(text: "Apple")
     let Fruit = Entity(text: "Fruit")

PlaygroundBook/Modules/BookCore.playgroundmodule/Sources/Model/Entity.swift

@@ -19,13 +19,11 @@ public struct Entity: Identifiable {
   var color: UIColor 
 
   public init(
-    position: CGPoint = .zero,
-    text: String = "",
-    color: UIColor = UIColor.colors.randomItem()
+    text: String = ""
   ) {
-    self.position = position
+    self.position = .zero
     self.text = text
-    self.color = color
+    self.color = UIColor.colors.randomItem()
   }
 
 }

PlaygroundBook/Modules/BookCore.playgroundmodule/Sources/Model/Graph.swift

@@ -133,7 +133,8 @@ extension Graph {
 
     @discardableResult func quickAddEntity(_ entity: Entity,_ entityName: String, at point: CGPoint? = nil, relation: String) -> Entity {
         let target = point ?? entity.position
-        let child = Entity(position: target, text: entityName)
+        var child = Entity(text: entityName)
+        child.position = target
         addEntity(child)
         connect(entity, to: child, relation: relation)
         rebuildLinks()