example source code

1 module example;
2        
3 import std.stdio;
4 import artemisd.all;
5 
6 final class Position : Component
7 {
8     mixin TypeDecl;
9 
10     float x;
11     float y;
12 
13     this(float x, float y)
14     {
15         this.x = x;
16         this.y = y;
17     }
18 }
19 
20 final class Velocity : Component
21 {
22     mixin TypeDecl;
23 
24     float x;
25     float y;
26 
27     this(float x, float y)
28     {
29         this.x = x;
30         this.y = y;
31     }
32 }
33 
34 final class Renderer : Component
35 {
36 	mixin TypeDecl;
37 }
38 
39 final class MovementSystem : EntityProcessingSystem
40 {
41     mixin TypeDecl;
42 
43     this()
44     {
45         super(Aspect.getAspectForAll!(Position,Velocity));
46     }
47 
48     override void process(Entity e)
49     {
50         Position pos = e.getComponent!Position;
51         Velocity vel = e.getComponent!Velocity;
52         Renderer rend = e.getComponent!Renderer;
53         assert(pos !is null);
54         assert(vel !is null);
55         assert(rend is null);
56 
57         pos.x += vel.x * world.getDelta();
58         pos.y += vel.y * world.getDelta();
59 
60         writeln(e, " move to (", pos.x, ",", pos.y, ")");
61     }
62 }
63 
64 final class RenderSystem : EntityProcessingSystem
65 {
66     mixin TypeDecl;
67 
68     this()
69     {
70         super(Aspect.getAspectForAll!(Position, Renderer));
71     }
72 
73     override void process(Entity e)
74     {
75         Renderer rend = e.getComponent!Renderer;
76         Position pos = e.getComponent!Position;
77         assert(pos !is null);
78         assert(rend !is null);
79 
80         writeln(e, " rendered at (", pos.x, ",", pos.y, ")");
81     }
82 }
83 
84 void main(string[] argv)
85 {
86     World world = new World();
87     world.setSystem(new MovementSystem);
88 	world.setSystem(new RenderSystem);
89     world.initialize();
90 
91     Entity e = world.createEntity();
92     e.addComponent(new Position(0,0));
93     e.addComponent(new Velocity(10,0));
94     e.addToWorld();
95 
96 	Entity e1 = world.createEntity();
97     e1.addComponent(new Position(0,0));
98 	e1.addComponent(new Renderer);
99 	e1.addToWorld();
100 
101     import core.thread;
102     
103     while(true)
104     {
105         world.setDelta(1/60.0f);
106         world.process();
107         Thread.sleep(dur!("msecs")(1000));
108     }
109 }