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gogodr
I post too much
 Reputation: 125
Joined: 19 Dec 2006
Posts: 2041
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 Posted: Tue Jul 21, 2009 2:12 pm Post subject: [C#]XNA Particle system Template |
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I coded this with the help of a tutorial but I find it quite useful to just copy and paste on any kind of C# game
its all about a principal class file and make separated class files ccalling to the principal class file then just use the functions in the main file
here it it
------------------
to use it you should call this function
particle variable.AddParticles(position value here);
and add this in the main public game() of the XNA game studio template
particle variable = new particle system class(this, 1, "particle image file");
Components.Add(particle variable);
also declare the variable at the top
ParticleSystem particle class variable;
after doing this all what you need is to add the following classes::
Particles.cs
| Code: | using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
namespace XNa_game_2D
{
namespace particles
{
public class Particles
{
public Vector2 position;
public Vector2 velocity;
public Vector2 acceleration;
public float lifetime;
public float timesincestart;
public float scale;
public float rotation;
public float rotationspeed;
public bool Active{
get { return timesincestart < lifetime;}
}
public void Initialize(Vector2 position, Vector2 velocity, Vector2 acceleration, float lifetime, float scale, float rotationspeed)
{
this.position = position;
this.velocity = velocity;
this.acceleration = acceleration;
this.lifetime = lifetime;
this.scale = scale;
this.rotationspeed = rotationspeed;
this.timesincestart = 0.0f;
this.rotation = 0.0f;
}
public void Update(float dt)
{
velocity += acceleration * dt;
position += velocity * dt;
rotation += rotationspeed * dt;
timesincestart += dt;
}
}
}
}
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ParticleSystem.cs
| Code: | using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
namespace XNa_game_2D
{
namespace particles
{
public abstract class ParticleSystem : DrawableGameComponent
{
private Game1 game;
private Texture2D texture;
private Vector2 origin;
private static Random random = new Random();
public static Random Random { get { return random; } }
private int howmanyeffects;
Particles[] particles;
Queue<Particles> freeparticles;
public int freeparticlecount
{
get { return freeparticles.Count; }
}
public const int AlphaBlendDrawOrder = 100;
public const int AdditiveDrawOrder = 200;
protected SpriteBlendMode spriteBlendMode;
protected int MinNumParticles;
protected int MaxNumParticles;
protected float MinLifeTime;
protected float MaxLifeTime;
protected string textureFileName;
protected float MinInitialSpeed;
protected float MaxInitialSpeed;
protected float MinAcceleration;
protected float MaxAcceleration;
protected float MinRotationSpeed;
protected float MaxRotationSpeed;
protected float MinScale;
protected float MaxScale;
protected ParticleSystem(Game1 game, int howmanyeffects, string textureFileName)
: base(game)
{
this.game = game;
this.howmanyeffects = howmanyeffects;
this.textureFileName = textureFileName;
}
public override void Initialize()
{
InitializeConstants();
particles = new Particles[howmanyeffects * MaxNumParticles];
freeparticles = new Queue<Particles>(howmanyeffects * MaxNumParticles);
for (int i = 0; i < particles.Length; i++)
{
particles[i] = new Particles();
freeparticles.Enqueue(particles[i]);
}
base.Initialize();
}
protected abstract void InitializeConstants();
protected override void LoadContent()
{
texture = game.Content.Load<Texture2D>(textureFileName);
origin.X = texture.Width / 2;
origin.Y = texture.Height / 2;
base.LoadContent();
}
public void AddParticles(Vector2 where)
{
int numParticles = random.Next(MinNumParticles, MaxNumParticles);
for (int i = 0; i < numParticles && freeparticles.Count > 0; i++)
{
Particles p = freeparticles.Dequeue();
InitializeParticles(p, where);
}
}
protected virtual Vector2 pickrandomDirection()
{
float angle = RandomBetween(0, MathHelper.TwoPi);
return new Vector2((float)Math.Cos(angle), (float)Math.Sin(angle));
}
public static float RandomBetween(float min, float max)
{
return min + (float)random.NextDouble() * (max - min);
}
protected virtual void InitializeParticles(Particles p, Vector2 where)
{
Vector2 direction = pickrandomDirection();
float velocity = RandomBetween(MinInitialSpeed, MaxInitialSpeed);
float acceleration = RandomBetween(MinAcceleration, MaxAcceleration);
float lifetime = RandomBetween(MinLifeTime, MaxLifeTime);
float scale = RandomBetween(MinScale, MaxScale);
float rotationspeed = RandomBetween(MinRotationSpeed, MaxRotationSpeed);
p.Initialize(where, velocity * direction, acceleration * direction, lifetime, scale, rotationspeed);
}
public override void Update(GameTime gameTime)
{
float dt = (float)gameTime.ElapsedGameTime.TotalSeconds;
foreach (Particles p in particles)
{
if (p.Active)
{
p.Update(dt);
}
if (!p.Active)
{
freeparticles.Enqueue(p);
}
}
base.Update(gameTime);
}
public override void Draw(GameTime gameTime)
{
game.SpriteBatch.Begin(spriteBlendMode);
foreach (Particles p in particles)
{
if (!p.Active)
continue;
float normalizedLifetime = p.timesincestart / p.lifetime;
float alpha = 4 * normalizedLifetime * (1 - normalizedLifetime);
float scale = p.scale * (float)(.75f + .25f * normalizedLifetime);
Color color = new Color(new Vector4(1, 1, 1, alpha));
game.SpriteBatch.Draw(texture, p.position, null, color, p.rotation, origin, scale, SpriteEffects.None, 0.0f);
}
game.SpriteBatch.End();
base.Draw(gameTime);
}
}
}
} |
and add your particle system class with the name you wish
| Code: | using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
namespace XNa_game_2D
{
namespace particles
{
class ExplosionParticleSystem: ParticleSystem
{
public ExplosionParticleSystem(Game1 game, int howmanyeffects, string textureFileName)
: base(game, howmanyeffects, textureFileName)
{
}
protected override void InitializeConstants()
{
MinInitialSpeed = 40;
MaxInitialSpeed = 500;
MinAcceleration = 0;
MaxAcceleration = 0;
MinLifeTime = 0.5f;
MaxLifeTime = 1.0f;
MinScale = 0.1f;
MaxScale = 0.6f;
MinNumParticles = 20;
MaxNumParticles = 25;
MinRotationSpeed = -MathHelper.PiOver4;
MaxRotationSpeed = MathHelper.PiOver4;
spriteBlendMode = SpriteBlendMode.Additive;
DrawOrder = AdditiveDrawOrder;
}
protected override void InitializeParticles(Particles p, Vector2 where)
{
base.InitializeParticles(p, where);
p.acceleration = -p.velocity / p.lifetime;
}
}
}
}
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this last one is what will control the behavior of each particle system you create, you can create multiple particle system with the same 2 root class files I posted above Particles.cs and ParticleSystem.cs
-Gogodr ;3
-edit uhmm maybe I should have posted this in general programming... but its just for games.. so I posted it here... xP
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iGod
Grandmaster Cheater
![]() Reputation: -1
Joined: 31 Jan 2009
Posts: 621
Location: Manchester, uk.
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| Posted: Tue Jul 21, 2009 2:20 pm Post subject: |
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| Seems foolproof, can i see it in action?
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gogodr
I post too much
Reputation: 125
Joined: 19 Dec 2006
Posts: 2041
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| Posted: Tue Jul 21, 2009 2:46 pm Post subject: |
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its in the game I posted before
it launches each time you hit an UFO
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