X-Git-Url: https://git.r.bdr.sh/rbdr/super-polarity/blobdiff_plain/8534e46e400268c5ceffb3b14f02cef39eedae8f..3de51c6f55d304f038df1b77c8ab346e2a187fe1:/Super%20Polarity/ParticleEngine.cs

diff --git a/Super Polarity/ParticleEngine.cs b/Super Polarity/ParticleEngine.cs
new file mode 100644
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+++ b/Super Polarity/ParticleEngine.cs	
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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace SuperPolarity
+{
+    class ParticleEngine
+    {
+        private Random random;
+        public Vector2 EmitterLocation { get; set; }
+        public Color Color; //TODO: Color list for random colors.
+        public int TTL;
+        public int TTLRandomFactor;
+        public int ScatterFactor;
+        public int ParticleCount;
+        public float StretchFactor;
+        private List<Particle> particles;
+        private List<Texture2D> textures;
+
+        public ParticleEngine(List<Texture2D> textures, Vector2 location)
+        {
+            EmitterLocation = location;
+            this.textures = textures;
+            this.particles = new List<Particle>();
+            random = new Random();
+            Color = Color.Red;
+            TTL = 20;
+            TTLRandomFactor = 40;
+            StretchFactor = 1;
+        }
+
+        private Particle GenerateNewParticle()
+        {
+            Texture2D texture = textures[random.Next(textures.Count)];
+            Vector2 position = EmitterLocation;
+            Vector2 velocity = new Vector2(
+                1f * (float)(random.NextDouble() * 2 - 1),
+                1f * (float)(random.NextDouble() * 2 - 1));
+
+            float angle = 0;
+            float angularVelocity = 0.1f * (float)(random.NextDouble() * 2 - 1);
+            Color color = Color;
+            float size = (float)random.NextDouble() * StretchFactor;
+
+            position.X += random.Next(-ScatterFactor, ScatterFactor);
+            position.Y += random.Next(-ScatterFactor, ScatterFactor);
+
+            int ttl = TTL + random.Next(TTLRandomFactor);
+
+            return new Particle(texture, position, velocity, angle, angularVelocity, color, size, ttl);
+        }
+
+        public void Update()
+        {
+            int total = 10;
+
+            for (int i = 0; i < total; i++)
+            {
+                particles.Add(GenerateNewParticle());
+            }
+
+            for (int particle = 0; particle < particles.Count; particle++)
+            {
+                particles[particle].Update();
+                if (particles[particle].TTL <= 0)
+                {
+                    particles.RemoveAt(particle);
+                    particle--;
+                }
+            }
+        }
+
+        public void Draw(SpriteBatch spriteBatch)
+        {
+            //spriteBatch.Begin();
+            for (int index = 0; index < particles.Count; index++)
+            {
+                particles[index].Draw(spriteBatch);
+            }
+            //spriteBatch.End();
+        }
+    }
+}