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; //TODO: Color list for random colors.
  15         public int TTL;
  16         public int TTLRandomFactor;
  17         public int ScatterFactor;
  18         public int ParticleCount;
  19         public float StretchFactor;
  20         private List<Particle> particles;
  21         private List<Texture2D> textures;
  22
  23         public ParticleEngine(List<Texture2D> textures, Vector2 location)
  24         {
  25             EmitterLocation = location;
  26             this.textures = textures;
  27             this.particles = new List<Particle>();
  28             random = new Random();
  29             Color = Color.Red;
  30             TTL = 20;
  31             TTLRandomFactor = 40;
  32             StretchFactor = 1;
  33         }
  34
  35         private Particle GenerateNewParticle()
  36         {
  37             Texture2D texture = textures[random.Next(textures.Count)];
  38             Vector2 position = EmitterLocation;
  39             Vector2 velocity = new Vector2(
  40                 1f * (float)(random.NextDouble() * 2 - 1),
  41                 1f * (float)(random.NextDouble() * 2 - 1));
  42
  43             float angle = 0;
  44             float angularVelocity = 0.1f * (float)(random.NextDouble() * 2 - 1);
  45             Color color = Color;
  46             float size = (float)random.NextDouble() * StretchFactor;
  47
  48             position.X += random.Next(-ScatterFactor, ScatterFactor);
  49             position.Y += random.Next(-ScatterFactor, ScatterFactor);
  50
  51             int ttl = TTL + random.Next(TTLRandomFactor);
  52
  53             return new Particle(texture, position, velocity, angle, angularVelocity, color, size, ttl);
  54         }
  55
  56         public void Update()
  57         {
  58             int total = 10;
  59
  60             for (int i = 0; i < total; i++)
  61             {
  62                 particles.Add(GenerateNewParticle());
  63             }
  64
  65             for (int particle = 0; particle < particles.Count; particle++)
  66             {
  67                 particles[particle].Update();
  68                 if (particles[particle].TTL <= 0)
  69                 {
  70                     particles.RemoveAt(particle);
  71                     particle--;
  72                 }
  73             }
  74         }
  75
  76         public void Draw(SpriteBatch spriteBatch)
  77         {
  78             //spriteBatch.Begin();
  79             for (int index = 0; index < particles.Count; index++)
  80             {
  81                 particles[index].Draw(spriteBatch);
  82             }
  83             //spriteBatch.End();
  84         }
  85     }
  86 }