git.r.bdr.sh - rbdr/super-polarity/blob - Super Polarity/ParticleEngine.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.Linq;
   4 using System.Text;
   5 using Microsoft.Xna.Framework;
   6 using Microsoft.Xna.Framework.Graphics;
   7
   8 namespace SuperPolarity
   9 {
  10     class ParticleEngine
  11     {
  12         private Random random;
  13         public Vector2 EmitterLocation { get; set; }
  14         private List<Particle> particles;
  15         private List<Texture2D> textures;
  16
  17         public ParticleEngine(List<Texture2D> textures, Vector2 location)
  18         {
  19             EmitterLocation = location;
  20             this.textures = textures;
  21             this.particles = new List<Particle>();
  22             random = new Random();
  23         }
  24
  25         private Particle GenerateNewParticle()
  26         {
  27             Texture2D texture = textures[random.Next(textures.Count)];
  28             Vector2 position = EmitterLocation;
  29             Vector2 velocity = new Vector2(
  30                 1f * (float)(random.NextDouble() * 2 - 1),
  31                 1f * (float)(random.NextDouble() * 2 - 1));
  32             float angle = 0;
  33             float angularVelocity = 0.1f * (float)(random.NextDouble() * 2 - 1);
  34             Color color = new Color(
  35                 (float)random.NextDouble(),
  36                 (float)random.NextDouble(),
  37                 (float)random.NextDouble());
  38             float size = (float)random.NextDouble();
  39
  40             int ttl = 20 + random.Next(40);
  41
  42             return new Particle(texture, position, velocity, angle, angularVelocity, color, size, ttl);
  43         }
  44
  45         public void Update()
  46         {
  47             int total = 10;
  48
  49             for (int i = 0; i < total; i++)
  50             {
  51                 particles.Add(GenerateNewParticle());
  52             }
  53
  54             for (int particle = 0; particle < particles.Count; particle++)
  55             {
  56                 particles[particle].Update();
  57                 if (particles[particle].TTL <= 0)
  58                 {
  59                     particles.RemoveAt(particle);
  60                     particle--;
  61                 }
  62             }
  63         }
  64
  65         public void Draw(SpriteBatch spriteBatch)
  66         {
  67             //spriteBatch.Begin();
  68             for (int index = 0; index < particles.Count; index++)
  69             {
  70                 particles[index].Draw(spriteBatch);
  71             }
  72             //spriteBatch.End();
  73         }
  74     }
  75 }