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1 # Serpentity
2
3 Serpentity is a simple entity framework inspired by [Ash][ash].
4
5 Usage:
6
7 require('serpentity');
8
9 ## Instantiating an engine
10
11 var engine = Serpentity();
12
13 Add entities or systems, systems are added with a priority (the smaller
14 the number, the earlier it will be called):
15
16 engine.addEntity(entityFactory());
17 engine.addSystem(new GameSystem(), priority);
18
19 Update all systems:
20
21 engine.update(dt);
22
23 Remove entities or systems:
24
25 engine.removeEntity(entityReference);
26 engine.removeSystem(systemReference);
27
28 ## Creating Entities
29
30 Entities are the basic object of Serpentity, and they do nothing.
31
32 var entity = new Serpentity.Entity();
33
34 All the behavior is added through components
35
36 ## Creating Components
37
38 Components define data that we can add to an entity. This data will
39 eventually be consumed by "Systems"
40
41 Class("PositionComponent").inherits(Serpentity.Component)({
42 prototype : {
43 x : 0,
44 y : 0
45 }
46 });
47
48 You can add components to entities by using the add method:
49
50 entity.add(new PositionComponent());
51
52
53 Systems can refer to entities by requesting nodes.
54
55 ## Working with Nodes
56
57 Nodes are sets of components that you define, so your system can require
58 entities that always follow the API defined in the node.
59
60 Class("MovementNode").inherits(Serpentity.Node)({
61 types : {
62 position : PositionComponent,
63 motion : MotionComponent
64 }
65 });
66
67 You can then request an array of all the nodes representing entities
68 that comply with that API
69
70 engine.getNodes(MovementNode);
71
72 ## Creating Systems
73
74 Systems are called on every update, and they use components through nodes.
75
76 Class("TestSystem").inherits(Serpentity.System)({
77 prototype : {
78 added : function added(engine){
79 this.nodeList = engine.getNodes(MovementNode);
80 },
81 removed : function removed(engine){
82 this.nodeList = undefined;
83 }
84 update : function update(dt){
85 this.nodeList.forEach(function (node) {
86 console.log("Current position is: " + node.position.x + "," + node.position.y);
87 });
88 }
89 }
90 });
91
92 ## That's it
93
94 Just run `engine.update(dt)` in your game loop :D
95
96 ## TO-DO
97
98 * Removing components
99 * Implement the ashteroids demo (Serpentoids)
100 * Actually check performance
101
102 [ash]: http://www.ashframework.org/