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