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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();
}
}
}
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